Method of prepating acromein oxidation catalyst

专利摘要:
1525908 Acrylic acid by oxidation of acrolein MONTEDISON SpA 18 May 1977 [20 May 1976] 20958/77 Heading C2C [Also in Division B1] Unsaturated carboxylic acids, e.g. acrylic acid, are prepared by reacting an unsaturated aldehyde, e.g. acrolein, with oxygen in the vapour phase at 200-370‹ C. with a contact time of 0À5 to 5 seconds in the presence of a catalyst Mo 12 V a W b Co c O d where a=1À5-3À0, b=0-0À5, c=3À5-5À5 which is the coprecipitation product of soluble salts of Mo, V, Co and, if present, W.
公开号:SU715011A1
申请号:SU2484351
申请日:1977-05-19
公开日:1980-02-05
发明作者:Падован Марио；Баттистон Джанкарло；Пиньятаро Франческо；Ди Альберти Джорджано；Леофанти Джузеппе
申请人:Монтэдисон С.П.А. (Фирма)；
IPC主号:

专利说明:

It is carried out at 200-300 ° C for 6-24 hours and activated at 350-4 SOS for at least 2 hours. At the same time, calcination and activation are carried out in the presence of air.
The acrolein conversion (C) and acrylic acid selectivity (S) are calculated as follows:
CHA v c - er pl where AKtssh and Acceptr is the amount of the original and unreacted acrolein, mol;
Hell is the amount of aldehyde, mol. .S Cf, p / Sdts. where DSS is the amount of carbon in the product, g-atom; Sak is the amount of carbon in reacted acrolein, g-atom. .
Example. To prepare a catalyst, Co (NO3) b HgO is dissolved in deionized water (240 ml) in a 2 L flask at room temperature, with continuous stirring. The pH of the solution is 2.2.
At 70 ° C, a solution is prepared (° o and NH4VO in deionized water
(final solution volume 760 ml). Under the first solution, the second solution is added to the first solution for 60 minutes to a certain pH value, stirred for 15 minutes, the precipitate is washed with 2 liters of cold deionized water, dried for 12 hours at 110 ° C, calcined for 12 hours and activated for 5 hours at 400 ° C (heating rate 2s / min). Determine the yield of catalyst in terms of the oxides of the elements introduced in the form of salts. The catalyst is crushed to a grain size of 60-80 mesh (by Tyler).
In a steel reactor (d 10 mm) equipped with a thermostat, 7 ml of catalyst are introduced as a fixed bed and a mixture of 5.5% acrolein, 59.5% air and 35% steam is passed over it with contact time 1c temperature specified in the table. 1. The results are shown in Table. one.
EXAMPLE 2 Analogously to Example 1, a catalyst of composition Io, 2, is obtained. Vj Wo, 2CO4, o 045- (see Table 1), but calcination and activation are carried out at different temperatures indicated in Table. 2
h
Table 2 When calcining the catalyst at a temperature below 200 ° C salt. the active components are not completely lagged to oxides, but upon activation. at temperatures below 350 ° C, the converse and selectivity decrease. Carrying out the calcination at a temperature above is impractical, since

权利要求:
Claims (1)
[1]
this does not increase the selectivity, and when the activation is carried out at a temperature of Bhiuje 450c, a catalyst is obtained whose activity is lower than that of a known catalyst. Thus, when activating at 500 ° C and vapor-phase epoxidation of acrolein in case of conversion of acrylic, 1a is -77.5%, and the selectivity for acrylic acid is 54.8%. DETAILED DESCRIPTION A method for preparing a catalyst for the oxidation of acrolein based on cobalt, molybdenum, vanadium or cobalt, molybdenum, vanadium and tungsten, comprising mixing solutions of active component salts, drying, calcining at 200300 s and activation at 350-450 ° C, characterized in that , in order to obtain a catalyst with increased activity, mixing is carried out by adding to the aqueous solution of the cobalt salt an aqueous solution of the salts of the remaining components at 40-90 ° C to a pH of 2.5-5.5, followed by filtering the resulting precipitate . Sources of information taken into account in the examination 1. US Patent No. 3736354, cl. C 07 C 51/26, published 1973 (prototype).

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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BE607864A|1959-02-17|

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NL147411B|1968-05-13|1975-10-15|Rikagaku Kenkyusho|PROCESS FOR PREPARING ACRYLIC ACID BY CATALYTIC OXIDATION OF ACROLEIN IN THE VAPOR PHASE.|

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IT1001977B|1973-11-28|1976-04-30|Sir Soc Italiana Resine Spa|PROCEDURE FOR THE PREPARATION OF METHYL ACRYLATE OR MIXTURES OF METHYL ACRYLATE AND ACRILIC ACID|KR100204729B1|1997-03-17|1999-06-15|성재갑|Preparation of ctalyst for partially oxidizing of acrolein|

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US6384275B2|1998-09-23|2002-05-07|Lg Chem, Ltd.|Method of producing acrylic acid using a catalyst for acrolein oxidation|

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DE19815278A1|1998-04-06|1999-10-07|Basf Ag|Multimetal oxide materials|

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US6620968B1|1999-11-23|2003-09-16|Rohm And Haas Company|High hydrocarbon space velocity process for preparing unsaturated aldehydes and acids|

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DE10046928A1|2000-09-21|2002-04-11|Basf Ag|Process for the preparation of multimetal oxide materials|

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US20060205978A1|2002-08-20|2006-09-14|Nippon Shokubai Co., Ltd.|Production process for catalyst|

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JP4646684B2|2005-04-18|2011-03-09|株式会社日本触媒|Gas phase oxidation catalyst and method for producing acrylic acid using the same|

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MX2008015540A|2007-12-26|2009-06-26|Rohm Ahd Haas Company|Integrated process for preparing a carboxylic acid from an alkane.|

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EP2143704A1|2008-07-10|2010-01-13|Rohm and Haas Company|An integrated process for preparing a carboxylic acid from an alkane|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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IT23448/76A|IT1063376B|1976-05-20|1976-05-20|PROCEDURE FOR THE PREPARATION OF UNSATURATED CARBOXYLIC ACIDS BY CATALYTIC OXIDATION IN THE GASEOUS PHASE OF THE CORRESPONDING ALDEHYDES|

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