• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for decreasing the viscosity and improving the evaporability of a sulfate liquor from a cellulose cook. The temperature of the black liquor is raised above the cooking temperature, preferably to 170 - 190<o>C for splitting the macro-molecular fraction contained in the liquor. Na2S or any other reducing agent intensifies the splitting.
    公开号:SU1720498A3
    申请号:SU884355885
    申请日:1988-05-27
    公开日:1992-03-15
    发明作者:Киискиля Эркки；Виркола Нильс-Эрик
    申请人:А.Альстрем Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    ate
    WITH
    This invention relates to a technology for processing waste liquors from alkaline pulping to reduce the viscosity of liquors.
    There is a method for processing spent sulphate or soda liquor of pulp production by evaporation of the liquor in several steps.
    This method does not sufficiently reduce the viscosity of the liquor and increase its volatility.
    The aim of the invention is to reduce the viscosity and increase the volatility of the liquor.
    According to the proposed method, before the first or last stage of evaporation, the liquor is heated to 170-190 ° C and maintained at the indicated temperature for 1-60 minutes.
    When heated before the first evaporation step, sodium polysulfide can be added to the liquor,
    The proposed method provides an adjustable viscosity reduction of the total amount of black liquor without separating the various fractions and without extensive capital expenditures in both batch and continuous cooking.
    The proposed method makes it possible to improve the performance of an existing evaporator plant or, in a new evaporator plant, to make the heat transfer surface even smaller. In addition, the final solids content of the liquor can be increased without any significant measurements in the encapsulation or apparatus, which increases the savings in heat of combustion. When reducing the resistance
    J
    yoo o
    about

    s
    The flow rate of liquor transfer is increased, and the power consumption of the pump is reduced.
    When studying the absolute amounts of lignin fractions of various sizes as a function of cooking parameters when cooking with caustic soda (soda) and with sulphate cooking, the following conditions can be provided:
    in soda boiling, the absolute amount of macromolecular lignin increases at the very beginning and after that a constant level is maintained;
    In sulphate pulping, the amount of macromolecular romolecular lignin increases at the very beginning and reaches a maximum, after which its amount gradually decreases as the sulfide breaks down the lignin.
    The higher the sulphidity of the cooking, the more intense the splitting (dissociation). With conventional cooking in the range of 20–35% sulphidity, the residual volume of sulphides is adequate for cleavage. In order to intensify dissociation, in some cases, a reducing agent, such as sodium polysulfide, may be added.
    Increasing the temperature above the normal cooking temperature, up to 170-190 ° C, accelerates the cleavage of the macromolecular lignin fraction to such an extent that only 1-5 min at elevated temperature is adequate to cause splitting and a decrease in viscosity. In addition, calcium and lignin compounds causing deposition in the evaporator are dispersed during the heat treatment.
    Example. Black liquor in the process of cooking pulp from hardwood is heated to 170, 180 and 190 ° C for different periods of time. Lye is placed in the evaporator. The viscosity of the liquor in the evaporation process is checked from time to time and when the viscosity is approximately 200 mPa s, samples are taken to determine the dry matter content.
    The drawing shows the dependence of the solids content on the residence time of the liquor.
    As can be seen from the graph, the viscosity of the liquor with a dry matter content of about 78%, which is heated to 190 ° C for 10 minutes, is the same as that of the initial liquor with a dry matter content of about 75%. To achieve the same effect when heated liquor at 180 ° C, a heating period of 30 minutes is necessary.
    The longer the heating time and the higher the temperature, the stronger the heating effect. The effectiveness of heat treatment depends on the content of the dry residue in black liquor and on the type of wood, from
    which he is going on.
    The result of additional heating of the liquor at 190 ° C. The viscosity of the liquor is confirmed by the following measurement results presented in the table.
    The test material is Kamur cooking black liquor with a dry matter content of 71%,
    As can be seen from the table, the effect of heat treatment on viscosity is positive. Treatment at 120 ° C reduces viscosity, but is not as effective as treatment at 190 ° C. Heat treatment for only 1 min at 190 ° С reduces the viscosity from 200 mPa-s to 78 mPa-s.
    The addition of Na2Sn has a slight viscosity reducing effect.
    A decrease in the viscosity of the liquor also testifies to its increased evaporation.
    Invention Formula
    权利要求:
    Claims (2)
    [1]
    1. A method of processing spent sulphate or soda lye from the production of pulp by evaporation of the liquor in several stages is also distinguished by the fact that, in order to reduce the viscosity and increase the evaporation of the liquor, before the first or last stage of evaporation of lye is heated to 170-190 ° C and maintained at the specified temperature for 1-60 minutes
    [2]
    2. A method according to claim 1, characterized in that, when heated before the first evaporation stage, to the liquor is added
    sodium polysulfide.
    Overthrow dry
    Essentials%
    80
    ten
    20
    3040
    Time of holding liquor, min
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1720498A3|1992-03-15|Method of processing spent sulfate or soda lye in cellulose production
    Baker1973|Effect of lignin on the in vitro digestibility of wood pulp
    Kolar et al.1996|Effect of various deacidification solutions on the stability of cellulose pulps
    US2030383A|1936-02-11|Method of treating pulp
    SE8304973L|1984-03-17|PROCEDURE FOR THE PREPARATION OF COOKET LIQUID FOR POWER MASS COOKING
    RU2037594C1|1995-06-19|Method for producing cellulose
    US2269985A|1942-01-13|Manufacture of wood pulp
    US3988198A|1976-10-26|Method for treating hemi caustic effluents
    US2161763A|1939-06-06|Process of making paper pulp
    US3013933A|1961-12-19|Method for preparation of wood cellulose
    SU1498857A1|1989-08-07|Method of alkaline digestion of pulp in intermittent-action digesters
    US5911853A|1999-06-15|Method for treating paper mill condensate to reduce the amount of sulfur compounds therein
    US2988470A|1961-06-13|Method and apparatus for continuous countercurrent pulping of ligno-cellulose materials
    US1581671A|1926-04-20|Production of pulp and other products from wood
    SU1557228A1|1990-04-15|Method of producing pulp for chemical treatment
    US4517052A|1985-05-14|Internal sizing with black liquid
    SU679672A1|1979-08-15|Sulphate pulp production method
    SU1172966A1|1985-08-15|Method of producing sulphate pulp
    SU1094877A1|1984-05-30|Method of producing pulp
    GB468306A|1937-07-02|Improvements in or relating to the refining of wood pulp
    SU903417A1|1982-02-07|Method of producing cellulose pulp for chemical processing
    SU996578A1|1983-02-15|Method of producing cellulose for chemical processing
    SU1035110A1|1983-08-15|Process for producing cellulose
    SU771224A1|1980-10-15|Method of obtaining cellulose pulp for chemical processing
    SU55014A1|1938-11-30|Method of bleaching and refining wood pulp
    同族专利:
    公开号 | 公开日
    SE8801948D0|1988-05-25|
    PT83838A|1986-12-01|
    CA1288203C|1991-09-03|
    BR8607216A|1988-11-01|
    SE8801948L|1988-05-25|
    WO1987003315A1|1987-06-04|
    JPH0248677B2|1990-10-25|
    FR2593528B1|1990-03-30|
    CS273179B2|1991-03-12|
    US4929307A|1990-05-29|
    FI75615B|1988-03-31|
    FI854732A|1987-05-30|
    CS868786A2|1990-06-13|
    FI854732A0|1985-11-29|
    PL262650A1|1987-11-02|
    PL155015B1|1991-10-31|
    FI75615C|1991-08-26|
    SE466756B|1992-03-30|
    FR2593528A1|1987-07-31|
    PT83838B|1988-10-14|
    JPS63502674A|1988-10-06|
    引用文献:
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    DE897513C|1942-01-16|1953-11-23|Hilding Olof Vidar Bergstroem|Process for the evaporation of pulp waste liquors|
    US2754897A|1951-01-22|1956-07-17|Ramen Torsten|Processes for concentrating liquids containing incrustation-forming substances|
    US2891843A|1953-02-09|1959-06-23|Minnesota & Ontario Paper Co|Chemical recovery process and apparatus|
    FR1112129A|1953-11-19|1956-03-08|Inventa Ag|Process for the preparation of lignin from black liquors|
    US3026240A|1959-05-04|1962-03-20|Babcock & Wilcox Co|Chemical recovery system|
    US3092535A|1960-04-27|1963-06-04|Smith Paper Mills Ltd Howard|Sulphite pulping process|
    NL273213A|1961-01-05|
    US3451765A|1964-03-25|1969-06-24|Frederick A Schleindl|Method of treating spent pulp liquor by adding gas-evolving metals thereto|
    CH552716A|1972-03-06|1974-08-15|Promotion Et D Exploit Ind De|PROCESS FOR OBTAINING CELLULOSE FROM LIGNO-CELLULOSIC RAW MATERIALS.|
    SE377348B|1972-07-14|1975-06-30|Mo Och Domsjoe Ab|
    DE2506970C3|1975-02-19|1981-04-16|Metallgesellschaft Ag, 6000 Frankfurt|Process for converting highly viscous waste pulp liquors into a pumpable state|
    CA1097465A|1976-11-30|1981-03-17|James R. Prough|Black liquor energy recovery|
    FI60041C|1980-05-21|1981-11-10|Ahlstroem Oy|FOERFARANDE FOER TILLVERKNING AV ALKALISK SULFITMASSA|
    FI64409C|1981-06-01|1983-11-10|Tampella Oy Ab|SAETT ATT STYRA FOERBRAENNINGEN AV EN TILL SIN KEMISKA KOMPOSITION VARIERANDE BRAENNLUT I SODAPANNAN|
    SE452482B|1982-04-28|1987-11-30|Sunds Defibrator|PROCEDURE FOR BATCH PREPARATION OF SULPHATE Pulp WITH HIGH DEGREE|
    SE8204266L|1982-07-12|1984-01-13|Korsnaes Marma Ab|PROCEDURE FOR SUBMISSION OF THE CHEMICAL LOSSES DURING MASS PREPARATION|
    US4470876A|1982-07-22|1984-09-11|Beaupre Marc F|Kraft overload recovery process|
    FI66035B|1982-09-14|1984-04-30|Rauma Repola Oy|FOERFARANDE FOER FOERBAETTRING AV AVDUNSTBARHET AV AVFALLSVAETSKA UPPSTAODD UNDER CELLULOSAFRAMSTAELLNINGSPROCESS|
    FI65375C|1982-09-20|1984-05-10|Ekono Oy|SAETT VID AOTERKOMPRESSIONSINDUNSTNING AV EN LOESNING|
    SE8400904L|1984-02-20|1985-08-21|Goetaverken Energy Syst Ab|METHOD AND DEVICE FOR REDUCING THE VISCOSITY OF BLACK LIQUID|
    JPS6183391A|1984-09-26|1986-04-26|Ebara Corp|Concentration of black liquor|
    SE8502807D0|1985-06-06|1985-06-06|Ahlstroem Foeretagen|SET AND DEVICE DISABLE DEVICE|FI85515C|1990-07-09|1996-04-10|Ahlstroem Oy|Process for controlling the sulphidity of a sulphate cellulose plant|
    FI87092C|1990-11-07|1992-11-25|Ahlstroem Oy|FOERFARANDE FOER BEHANDLING AV SVARTLUT|
    US5326433A|1991-02-06|1994-07-05|Ahlstrom Recovery Inc.|Multi-level sulfide content white liquor production and utilization in cellulose pulping|
    CA2103664C|1991-02-06|1997-08-19|Rolf Ryham|Method of recovering energy and chemicals from black liquor|
    FI92226B|1991-04-15|1994-06-30|Ahlstroem Oy|Method for concentrating waste liquor and recovering cooking chemicals in pulp production with alcohol-based cooking solutions|
    US5213662A|1991-08-14|1993-05-25|Kamyr, Inc.|Treatment of chips with high temperature black liquor to reduce black liquor viscosity|
    FI92725C|1991-09-09|1994-12-27|Ahlstroem Oy|Process for preparing boiling liquid|
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    US5662774A|1992-04-01|1997-09-02|Tampella Power Oy|Adjusting the sulphur balance of a sulphate cellulose plant by heat treating black liquor in a last evaporation stage|
    US5489363A|1993-05-04|1996-02-06|Kamyr, Inc.|Pulping with low dissolved solids for improved pulp strength|
    US5472568A|1993-09-07|1995-12-05|Air Products And Chemicals, Inc.|Method for controlling the viscosity of Kraft black liquor|
    GB9503562D0|1995-02-23|1995-04-12|Thor Technology Corp|Black liquor viscosity control|
    SE520956C2|2001-12-05|2003-09-16|Kvaerner Pulping Tech|Continuous boiling with extra residence time for drained liquid outside the boiler|
    CN101580285A|2009-04-01|2009-11-18|兰州节能环保工程有限责任公司|Thermal cracking device for papermaking black liquor of non-wood material|
    JP5894594B2|2010-07-07|2016-03-30|ストラ エンソ オサケ ユキチュアユルキネンＳｔｏｒａ Ｅｎｓｏ Ｏｙｊ|Method for producing precipitated lignin from black liquor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI854732A|FI75615C|1985-11-29|1985-11-29|FOERFARANDE FOER SAENKNING AV SVARTLUTENS VISKOSITET.|
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