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  • 专利说明
  • 权利要求
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    • 专利摘要:
    METHOD AND COMPOSITION FOR THE ELIMINATION OF HYDROGEN SULPHIDE AND / OR MERCAPTANS FROM A FLUID. The present invention relates to the use of neutral aqueous solutions of glyoxal (pH approximately 6 to 8.5) which eliminates H2S which is present in natural gas and oil better than glyoxal alone or base alone. The resulting scavenger combination significantly increases the reaction rate and the overall scavenging efficiency, that is, the glyoxal capacity used alone. A plug can optionally be used. In another embodiment, the combination of non-nitrogen and glyoxal surfactants results in a significant increase in reaction speed and overall elimination efficiency, that is, the capacity compared to glyoxal used alone
    公开号:BR112013023976B1
    申请号:R112013023976-0
    申请日:2012-03-06
    公开日:2020-10-20
    发明作者:Sunder Ramachandran；Vladimir Jovancicevic；Kyle C. Cattanach；Michael P. Squicciarini
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    Technical Field
    [001] The present invention relates to methods and compositions for the elimination of H2S and / or mercaptans from fluids, and more particularly it relates, in a non-limiting embodiment, to methods and compositions for the elimination of H2S and / or fluid mercaptans using glyoxal and a non-nitrogen base and / or surfactant. Background of the Technique
    [002] In well drilling, completion, production, 0 transport, 0 downhole storage and processing of crude oil and natural gas, including waste water, associated with the production of crude oil and gas, and in oil storage residual fuel, H2S and / or mercaptans are often found. The presence of H2S and mercaptans is questionable because they often react with other hydrocarbons or components of the fuel system. Another reason why H2S and mercaptans are questionable is that they are often highly corrosive. Yet another reason why H2S and mercaptans are undesirable is that they have highly harmful odors. The odors resulting from H2S and mercaptans are detectable by the human nose in relatively low concentrations and are well known. For example, mercaptans are used to odor natural gas and used as a repellent for possums and other animals.
    [003] The predominant mercaptan H2S scavengers for natural gas and crude oil are monoethanolamine triazines (MEA) and monomethylamine triazines (MMA). These compounds contain nitrogen and, when used in sufficient concentration, can cause problems for certain refineries. There have been cases where operators have required the use of a H2S eliminator that does not contain nitrogen. Glyoxal (C2H2O2) and acrolein (C3H4O) have been used as H2S eliminators in these cases. Glyoxal is a slow-acting eliminator and can be corrosive to carbon steel. Acrolein is an effective eliminator, but an extremely toxic substance that operators do not like to use.
    [004] It would be desirable to discover a new H2S and mercaptan eliminator that does not contain nitrogen and that is very effective, but that overcomes the deficiencies of the previous eliminators. summary
    [005] In a non-limiting embodiment, a composition is provided for synergistic elimination of hydrogen sulphide and / or mercaptans from a fluid, wherein the composition includes dialdehyde, a base, a nitrogen-free surfactant and optionally a buffer .
    [006] A non-restrictive version, a method for removing hydrogen sulphide and / or mercaptans from a fluid, is also provided, which includes, but is not necessarily limited to, an aqueous phase, a gas phase, a hydrocarbon phase and their mixtures. The method involves contacting the fluid with a composition in an amount effective to synergistically eliminate hydrogen sulfide and / or mercaptans. The composition comprises at least one dialdehyde, and the second component which is at least one base and / or at least one surfactant that does not contain nitrogen. The amount of hydrogen sulphide and / or mercaptans eliminated is greater compared to a composition that has a greater amount of dialdehyde where the base is absent.
    [007] In a non-restrictive version, a method is also provided for the removal of hydrogen sulphide and / or mercaptans from a fluid that includes, but is not necessarily limited to, an aqueous phase, a gas phase, a hydrocarbon phase and their mixtures. The method involves contacting the fluid with a composition in an amount effective to synergistically eliminate hydrogen sulfide and / or mercaptans. The composition comprises at least one dialdehyde and at least one base (in the absence of a nitrogen-free surfactant). The amount of hydrogen sulphide and / or mercaptans eliminated is greater compared to a composition that has a greater amount of dialdehyde, where the base is absent.
    [008] In addition, in a non-limiting embodiment, a method is alternatively provided for the removal of hydrogen sulphide and / or mercaptans from a fluid that includes, but is not necessarily limited to, an aqueous phase, a gas phase, a hydrocarbon phase and mixtures thereof. The method involves contacting the fluid with a composition in an amount effective to synergistically eliminate hydrogen sulphide and / or mercaptans, where the composition includes at least one dialdehyde and at least one surfactant that does not contain nitrogen (in the absence of at least a base), in which the amount of hydrogen sulphide and / or mercaptans eliminated is greater, compared to a composition that has a greater amount of dialdehyde, where the surfactant that does not contain nitrogen is absent.
    [009] Any of these methods can optionally include corrosion inhibitors such as phosphate esters, sulfur-oxygen phosphates or polyphosphate esters and the like. Brief Description of Drawings
    [0010] FIG. 1 is a graph of the normalized H2S concentration as a function of time for H2S eliminated from oil at 1 atmosphere (0.1 MPa) and 25 ° C, where the oil contained 3000 ppm H2S and 5% CO2, where The H2S eliminator is injected at the beginning of the test and, consequently, the normalized H2S concentration becomes reduced; The graph compares glyoxal alone and glyoxal together with alkaline substance (KOH) in a weight ratio of 90/10 (40% aqueous to glyoxal solution);
    [0011] FIG. 2 is a graph showing the results of an H2S uptake test showing the maximum H2S eliminated as a function of various ratios by weight of alkaline substance (KOH) Zglioxal at 1 atmosphere (0.1 MPa) and 25 ° C , where the oil contained 3000 ppm H2S and 5% CO2;
    [0012] FIG. 3 is a graph showing H2S elimination rates as a function of various weight ratios of alkaline substance (KOH) Zglioxal at 1 atmosphere (0.1 MPa) and 25 ° C, where the oil contained 3000 ppm H2S and 5% CO2;
    [0013] FIG. 4 is a graph showing the results of an H2S uptake test showing the uptake of mass as a function of various ratios in weight of surfactant that does not contain nitrogen / glyoxal at 1 atmosphere (0.1 MPa) and at temperature environment, where the oil contained 3000 ppm H2S and 5% CO2; and
    [0014] FIG. 5 is a graph showing H2S elimination rates as a function of several weight ratios of surfactant that does not contain nitrogen / glyoxal at 1 atmosphere (0.1 MPa) and at room temperature, where the oil contained 3000 ppm H2S and 5% CO2. Detailed Description
    [0015] It was surprisingly discovered that neutral aqueous solutions (pH of about 6 to 8.5) of glyoxal-based eliminator remove hydrogen sulfide present in natural gas and oil more completely and faster than glyoxal alone and thus, they are also expected to remove mercaptans. The process by which hydrogen sulfide is effectively removed from gas, water or oil involves introducing a synergistic combination of aqueous solution of glyoxal and alkaline into the system containing H2S. The synergistic eliminator combination significantly increases the reaction speed and overall elimination efficiency on the introduction of glyoxal alone. The synergy can be seen from the data described below.
    [0016] In specific applications to remove H2S from crude oil, the hydrogen sulfide / mercaptan scavenger can be introduced into the crude oil (or other fluid), at concentrations of about 10 independently to about 10,000 ppm, in a different mode from about 25 independently to about 7,500 ppm, alternatively from about 50 independently to about 5,000 ppm. The term "independently" when used in connection with a range means that any lower limit can be combined with any upper limit to obtain a valid alternative range.
    [0017] Glyoxal can be used as an H2S scavenger in crude oil and other applications where conventional nitrogen-containing compounds (eg triazines) can cause corrosion problems in downstream equipment and towers. However, the low pH (pH of approximately 2.5 to 3) of solutions in which glyoxal is the only active component can be corrosive to injection pumps and pipelines. In addition, due to its slow kinetics, the efficiency of glyoxal alone in these applications is significantly lower than expected theoretical values (2 mol of H2S / 3 mol of glyoxal). The new eliminator composition offers significantly improved kinetics and greater efficiency due to a strong synergistic effect between the solutions of glyoxal and alkaline substance in the neutral pH range (about 6 to about 8.5).
    [0018] In addition to glyoxal, other dialdehydes said to be useful in the process described herein include, but are not necessarily limited to, malondial-maldehyde, succindialdehyde, glutaraldehyde, and the like, and combinations thereof.
    [0019] Alkali compounds or bases said to be useful in the process described herein include, but are not necessarily limited to, sodium hydroxide (NaOH), potassium hydroxide (KOH), barium hydroxide (Ba (OH) 2), cesium hydroxide (CsOH), strontium hydroxide (Sr (OH) 2), calcium hydroxide (Ca (OH) 2), ammonium hydroxide (NH4OH), lithium hydroxide (LiOH) and the like, and combinations thereof.
    In a non-limiting embodiment, sufficient base is added so that the pH of the composition varies from about 6 independently to about 8.5; alternatively from about 7 independently to about 8.5; in a non-limiting embodiment, from about 7 independently to about 8. Alternatively, the amount of base (e.g., KOH) can vary from about 0.5 independently to about 10% by weight, alternatively from about 0 , 5% by weight independently to about 4% by weight based on the total disposal composition.
    [0021] In a different non-restrictive version, the weight ratio of the base to dialdehyde varies from about 15/85 independently to 0.1 / 99.9, alternatively to 5/95, where the dialdehyde is in an aqueous solution at 40% by weight; and, in another alternative embodiment, the weight ratio can vary from about 25/75 independently to 5/95, again where the dialdehyde is in a 40% by weight aqueous solution. The aqueous alkaline solution can be about 5 to 45% by weight.
    [0022] In some cases, where an aqueous solution of glyoxal (or another dialdehyde) is used in conjunction with a base or an alkaline substance, the pH will drop over time. Thus, in an optional modality, a buffer can be used, 0 which helps to stabilize the pH. Suitable buffers include, but are not necessarily limited to, sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate, disodium phosphate, sodium acetate and the like (any neutral buffer) and combinations thereof.
    [0023] In a non-limiting embodiment, the weight percentage of dialdehyde (eg glyoxal) varies from about 10 regardless of about 90 (again as a 40% by weight aqueous solution), the weight percentage of buffer ranges from about 1 independently to about 5, and the amount of base is effective so that the composition has a pH in the range of about 6 to about 8.5, based on the total composition; the rest being water or another solvent. In another non-limiting version, the weight percentage of dialdehyde (eg glyoxal) varies from about 20 independently to about 60 (again as a 40% by weight aqueous solution), alternatively up to about 50% in weight, the weight percentage of buffer varies from about 1 independently to about 2, and the amount of base is again effective so that the composition has a pH in the range of about 6 to about 8.5.
    [0024] Solvents suitable for H2S / mercaptan scavenging compositions herein include, but are not necessarily limited to, water, alcohols, glycols and mixtures thereof, alone or without water. Suitable alcohols include methanol and ethanol. Ethylene glycol can also be used as a solvent during the winter months for anti-freeze purposes. Another solvent can be butyl carbitol.
    [0025] In an alternative embodiment, at least one dialdehyde (for example, glyoxal) can be used in conjunction with at least one surfactant that does not contain nitrogen, in which the use of a base was optional. It was surprisingly found that the amount of hydrogen sulphide and / or mercaptans eliminated is greater, compared to an otherwise identical composition with respect to the dialdehyde, in which the surfactant that does not contain nitrogen is absent. Suitable nitrogen-containing surfactants include, but are not necessarily limited to, alkoxylated alkyl alcohols and their alkoxylated salts and alkyl phenols and their salts, alkyl and aryl sulfonates, sulfates, phosphates, carboxylates, polyoxyalkyl glycols, fatty alcohols, alkyl esters polyoxyethylene glycol sorbitan, alkyl sorbitan esters, polysorbates, glycosides and the like, and combinations thereof.
    [0026] In a non-limiting modality, the weight ratio of surfactant that does not contain nitrogen to dialdehyde varies from about 40/60 independently to 0.1 / 99.9; and, alternatively, from about 50/50 independently to about 0.9 / 99.1, again where the dialdehyde is in a 40% by weight aqueous solution. In another non-restrictive version, the weight ratio of nitrogen-free surfactant to dialdehyde ranges from about 15/85 independently to 0.5 / 99.5, alternatively from about 5/95 independently to about 0.1 / 99.9.
    [0027] On the other hand, in the composition the percentage by weight of dialdehyde varies from about 10 independently to about 90, and alternatively from about 20 independently to about 80 and, in another non-restrictive modality, from 10 independently to about 60 (40 wt% aqueous solution in all cases), and the weight percentage of nitrogen-free surfactant ranges from about 0.01 independently to about 20 wt%, based on the total scavenging composition. The reasons for an appropriate non-restrictive formulation containing all of a base (KOH), a buffer, a dialdehyde (glyoxal) and a nitrogen-free surfactant (C12 ethoxylated alcohol) can be those given in Table I. Table I

    [0028] The initial pH of this composition was 8.40. The balance is water.
    [0029] It has been found that the water-based formulations of these compounds act as eliminators of hydrogen sulfide when hydrogen sulfide is present in the aqueous phase, the gas phase and a hydrocarbon phase. These methods and compositions can be used to remove hydrogen sulfide present in natural gas produced from natural gas wells. They can also be used to remove hydrogen sulfide from crude oil. In addition, they can be used to remove hydrogen sulfide from brines containing hydrogen sulfide. These compositions and methods provide a H2S scavenger and / or mercaptan based on non-nitrogen.
    [0030] H2S / mercaptan eliminators are expected to be useful in a wide variety of applications, particularly "downstream" and "upstream" (downstream from a refinery) applications including, but not necessarily limited to, fuel oil waste, aircraft fuel, board fuel, asphalt, recovered aqueous streams, as well as mixed production streams, for example, well or downstream, including, but not limited to the elimination of H2S and mercaptans from production fluids. Another suitable application may be for removing hydrogen sulfide from a hydrogen stream, and the like.
    [0031] The method may involve the removal of H2S and / or mercaptans from a fluid including an aqueous phase, a hydrocarbon phase and mixtures thereof. In this embodiment, the compound can be present in the fluid at a concentration of about 10 independently to about 10,000 ppm, alternatively from about 50 independently to about 5,000 ppm, alternatively to about 1000 ppm, and in another non-restrictive version about 300 ppm. In a non-limiting modality, the method is practiced in a refinery. The primary applications within a refinery involve liquid hydrocarbon phases and gas hydrocarbon phases.
    [0032] When the method eliminates H2S and / or mercaptans from a gas phase, the method can be practiced by contacting the gas phase with droplets of the composition, and / or passing the gas phase through the composition, as by bubbling through a tower. With regard to the removal of H2S and / or mercaptans from a gas phase, the dialdehyde compound is present in the composition in a concentration of at least 5% by volume, in a different non-limiting embodiment, at least 50% in volume, alternatively at least 60% by volume, alternatively at least 70% by volume, alternatively at least 80% by volume, alternatively at least 90% by volume, and alternatively at least 95% by volume.
    [0033] The scavenging compositions described herein may also include corrosion inhibitors, including, but not necessarily limited to, phosphate esters, acetylenic alcohols, fatty acids and / or carboxylic acids and anhydrides, sulfur-oxygen phosphates and / or esters of polyphosphate, quaternary ammonium salts, imidazolines, mercapto alcohols.
    [0034] The invention will now be illustrated in relation to certain examples that are not intended to limit the invention in any way, but simply to further illustrate it in certain specific embodiments. EXAMPLE 1
    [0035] It is shown in FIG. 1 is a graph of the normalized H2S concentration as a function of time for H2S eliminated from oil at 1 atmosphere (0.1 MPa) and 25 ° C, where the oil contained 3000 ppm H2S and 5% CO2. The curve for glyoxal alone (40% in aqueous solution; triangles) indicates that the amount of H2S was reduced to its lowest level in about 18 minutes and then gradually increased as the glyoxal was spent. The curve for 0 glyoxal together with an alkaline substance (KOH) in a weight ratio of 90/10 (total 100 ppm) (36% aqueous solution of glyoxal) (circles) resulted in a much greater reduction in H2S, and more quickly, with a minimum slightly above 0.6 showing a much greater reduction in the presence of H2S compared to the use of glyoxal alone. In addition, although the presence of H2S gradually increases after treatment with a composition as described herein, it never approaches the value when glyoxal is used alone over the 90 minute period. EXAMPLE 2
    [0036] It is shown in FIG. 2 a graph showing the results of an H2S uptake test showing the maximum reduction of hydrogen sulfide as a function of various weight proportions of alkaline substance (KOH) Zglioxal (each totaling 100 ppm, where 0 glyoxal was again 40% by weight in an aqueous solution) at 1 atmosphere (0.1 MPa) and 25 ° C, where the oil contained 3000 ppm H2S and 5% CO2 showing H2S eliminated in ppm. It can be seen here that the best performance is seen with the weight ratio of 10/90. FIG. 3 shows the speed of H2S elimination in ppm / minute for the same conditions. It can be clearly seen that there was an unexpected peak in H2S eliminated (fig. 2) and the elimination speed (FIG. 3) for the 10/90 alkaline / glyoxal weight ratio compared to alkaline only (left side) of Figure 2 and Figure 3.) and only glyoxal (right side of Figure 2 and Figure 3). The dashed lines in both FIGS represent what would be expected as a smooth transition from only alkaline substance to only glyoxal (additive effect). EXAMPLE 3
    [0037] It is shown in FIG. 4 a graph showing the results of an H2S uptake test showing mass uptake as a function of various weight ratios of nitrogen-free surfactant (ethoxylated C12 alcohol) / glyoxal (each totaling 100 ppm, where 0 glyoxal was again 40% by weight in an aqueous solution) at 1 atmosphere (0.1 MPa) and 25 ° C, where the oil contained 3000 ppm H2S and 5% CO2 showing H2S eliminated in ppm. In this graph, the synergistic performance is seen with the different weight ratios that contain nitrogen-free surfactant. FIG. 5 shows the speed of H2S elimination in ppm / minute for the same conditions. It can be clearly seen that there was an unexpected peak in H2S eliminated (FIG. 4) at a 20/80 surfactant / glyoxal ratio and an unexpected peak in the elimination rate (FIGURE 5) for the surfactant / glyoxal weight ratio 10/90 compared to only surfactant (left side of FIGS.) and only glyoxal (right side of FIGS.). The dashed lines in both FIGS represent what would be expected as a smooth transition from only nitrogen-free surfactant to only glyoxal (additive effect).
    [0038] In the previous description, the invention has been described with reference to its specific modalities, and has been shown to be effective in providing methods and compositions for eliminating H2S and / or mercaptans from aqueous fluids, hydrocarbon fluids, gas phases and / or combinations of the same. However, it will be apparent that various modifications and alterations can be made to it without departing from the broader scope of the invention, as defined in the appended claims. Thus, the specification should be considered in an illustrative sense instead of a restrictive one. For example, specific dialdehydes, nitrogen-free surfactants, buffers and alkaline substances / bases that fall within the claimed parameters, but not specifically identified or tested on a particular composition or method, are expected to be within the scope of the present invention. .
    [0039] The terms "comprising" and "comprises" as used in the claims are interpreted as "including, but not limited to."
    [0040] The present invention can suitably comprise, consist or consist essentially of the described elements and can be practiced in the absence of an undisclosed element. For example, in the method for removing hydrogen sulfide and / or mercaptans from a fluid selected from the group consisting of an aqueous phase, a gas phase, a hydrocarbon phase and mixtures thereof, the method may consist of, or consist essentially of, contacting the fluid with a composition in an amount effective for the elimination of hydrogen sulphide and / or mercaptans, wherein the composition consists of, or consists essentially of at least one dialdehyde, and at least one base; wherein the amount of hydrogen sulphide and / or mercaptans eliminated is greater when compared to an otherwise identical composition in which the base is absent.
    [0041] Alternatively, in the present method for the elimination of hydrogen sulphide and / or mercaptans from a fluid selected from the group consisting of an aqueous phase, a gas phase, a hydrocarbon phase and mixtures thereof, the method may consist of or consist essentially of contacting the fluid with a composition in an amount effective for the elimination of hydrogen sulphide and / or mercaptans, wherein the composition consists of, or consists essentially of, at least one dialdehyde and at least one surfactant which contains no nitrogen; wherein the amount of hydrogen sulphide and / or mercaptans eliminated is greater compared to an otherwise identical composition, in which the nitrogen-free surfactant is absent.
    [0042] In another non-limiting modality, the present method for the elimination of hydrogen sulfide and / or mercaptans from a fluid selected from the group consisting of an aqueous phase, a gas phase, a hydrocarbon phase and mixtures thereof, the method may consist of or essentially consists of contacting the fluid with a composition in an amount effective for the elimination of hydrogen sulphide and / or mercaptans, wherein the composition consists of, or consists essentially of at least one dialdehyde, at least one base and at least surfactant that does not contain nitro-genius; wherein the amount of hydrogen sulphide and / or mercaptan eliminated is greater compared to an otherwise identical composition, in which the surfactant that does not contain nitrogen is absent.
    [0043] Finally, in the composition for removing hydrogen sulphide and / or mercaptans from a fluid, the composition may consist of, or consist essentially of, dialdehyde, a base and a nitrogen-free surfactant.
    权利要求:
    Claims (20)
    [0001]
    1. Method for the elimination of hydrogen sulfide and / or mercaptans from a fluid selected from the group consisting of an aqueous phase, a gas phase, a hydrocarbon phase and mixtures thereof, the method characterized by the fact that it comprises contacting the fluid with a composition in an amount effective for the synergistic elimination of hydrogen sulphide and / or mercaptans, wherein the composition consists of: at least one dialdehyde selected from a group consisting of glyoxal, malondialdehyde, succindialdehyde, glutaraldehyde and combinations thereof, at least one base selected from a group consisting of NaOH, KOH, Ba (OH) 2, CsQH, Sr (QH) 2, Ca (OH) 2, NH4OH, LiQH and combinations thereof, and at least a nitrogen-free surfactant selected from the group consisting of alkoxylated alkyl alcohols and salts thereof and the alkoxylated alkyl phenols and salts thereof, alkyl and aryl sulphonates, sulphates, phosphates, carboxylates, polyoxyalkyl glycols, fatty alcohols, polyoxyethylene glycol sorbitan alkyl esters, sorbitan alkyl esters, polysorbates, glycosides combinations thereof; and optionally a buffer, and optionally a solvent; where synergistically eliminating is defined as the amount of hydrogen sulphide and / or mercaptans eliminated is greater compared to a composition that has a greater amount of dialdehyde, in which the second component is absent.
    [0002]
    2. Method, according to claim 1, characterized by the fact that the composition has a pH in the range of 6 to 8.5.
    [0003]
    3. Method according to claim 1, characterized by the fact that the second component is a base and the weight ratio of the base to dialdehyde ranges from 25/75 to 5/95, in which the dialdehyde is in an aqueous solution to 40% by weight.
    [0004]
    4. Method according to claim 1, characterized by the fact that the composition additionally comprises a buffer selected from the group consisting of sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate, in disodium phosphate, in sodium acetate and combinations thereof.
    [0005]
    5. Method, according to claim 4, characterized by the fact that the second component is a base, in which in the composition: the percentage by weight of dialdehyde varies from 10 to 90 (aqueous solution at 40% by weight), the weight percentage of buffer ranges from 1 to 5, and the amount of base is effective so that the composition has a pH in the range of 6 to 8.5.
    [0006]
    6. Method, according to claim 1, characterized by the fact that the composition is present in the fluid in a concentration of 10 to 10,000 ppm.
    [0007]
    7. Method, according to claim 1, characterized by the fact that the method is practiced in a refinery.
    [0008]
    8. Method, according to claim 1, characterized by the fact that the method is practiced in an upstream production.
    [0009]
    9. Method according to claim 1, characterized by the fact that the weight ratio of surfactant that does not contain nitrogen to dialdehyde ranges from 40/60 to 0.1 / 99.9, in which the dialdehyde is in a solution 40% by weight aqueous.
    [0010]
    10. Method according to claim 1, characterized by the fact that the percentage by weight of dialdehyde varies from 10 to 90 (40% by weight aqueous solution), and the percentage by weight of surfactant that does not contain nitrogen varies from 0.01 to 20.
    [0011]
    11. Method according to claim 1, characterized in that the composition comprises an effective amount of a base so that the pH of the composition is in the range of 6 to 8.5.
    [0012]
    12. Method, according to claim 11, characterized by the fact that the weight ratio of the base to dialdehyde ranges from 15/85 to 0.1 / 99.9, in which the dialdehyde is in a 40% aqueous solution in weight.
    [0013]
    13. Method according to claim 11, characterized in that the composition also consists of a buffer selected from the group consisting of sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate, in disodium phosphate, in sodium acetate and combinations thereof.
    [0014]
    14. Method, according to claim 13, characterized by the fact that in the composition: the weight percentage of dialdehyde ranges from 10 to 90 (40% aqueous solution by weight), the weight percentage of buffer ranges from 1 to 5, and the amount of base is effective so that the composition has a pH in the range of 6 to 8.5.
    [0015]
    15. Method, according to claim 1, characterized by the fact that the composition consists of a solvent selected from a group consisting of water, an alcohol, a glycol and combinations thereof.
    [0016]
    16. Composition for the elimination of hydrogen sulphide and / or mercaptans from a fluid, the composition characterized by the fact that it consists of: at least one dialdehyde selected from a group consisting of glyoxal, malondialdehyde, succindialdehyde, glutaraldehyde and combinations thereof; and at least one base selected from a group consists of NaOH, KOH, Ba (OH) 2, CsOH, Sr (OH) 2, Ca (OH) 2, LiOH and combinations thereof; at least one nitrogen-free surfactant selected from a group consisting of alkoxylated alkyl alcohols and salts thereof and alkoxylated alkyl phenols and salts thereof, alkyl and aryl sulfonates, sulfates, phosphates, carboxylates, polyoxyalkyl glycols, fatty alcohols , polyoxyethylene glycol sorbitan alkyl esters, sorbitan alkyl esters, polysorbates, glycosides and combinations thereof; optionally a buffer selected from a group consisting of sodium bicarbonate, potassium bicarbonate, calcium bicarbonate, ammonium bicarbonate, disodium phosphate, sodium acetate and combinations thereof; and optionally a solvent selected from water, methanol, ethanol, eylene, glycol and butyl carbitol; where: the composition has a pH in the range of 6 to 8.5; and the weight ratio of the base to dialdehyde ranges from 25/75 to 0.1 / 99.9, where the dialdehyde is in a 40% by weight aqueous solution.
    [0017]
    17. Composition according to claim 16, characterized by the fact that the buffer is present in the composition.
    [0018]
    18. Composition, according to claim 16, characterized by the fact that in the composition: the percentage by weight of dialdehyde varies from 10 to 90 (aqueous solution at 40% by weight), the percentage by weight of buffer ranges from 1 to 5.
    [0019]
    19. Composition according to claim 16, characterized by the fact that the weight ratio of surfactant that does not contain nitrogen to dialdehyde ranges from 40/60 to 0.1 / 99.9, in which the dialdehyde is in a solution 40% by weight aqueous.
    [0020]
    20. Composition according to any one of claims 16 to 19, characterized in that the solvent is present in the composition.
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    法律状态:
    2018-12-26| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2019-10-01| B07A| Technical examination (opinion): publication of technical examination (opinion) [chapter 7.1 patent gazette]|
    2020-04-22| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161467116P| true| 2011-03-24|2011-03-24|
    US61/467,116|2011-03-24|
    US13/408,657|US9260669B2|2011-03-24|2012-02-29|Synergistic H2S/mercaptan scavengers using glyoxal|
    US13/408,657|2012-02-29|
    PCT/US2012/027883|WO2012128935A2|2011-03-24|2012-03-06|Synergistic h2s/mercaptan scavengers using glyoxal|
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