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Method for producing dimethyl maleate

A technology of dimethyl maleate and monomethyl maleate, which is applied in the field of producing dimethyl maleate, can solve the problems of serious catalyst loss, uneven distribution of catalysts, frequent replacement of catalysts, etc., and reduce the number of replacements , save catalyst, avoid the effect of catalyst loss

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there are frequent catalyst replacements in the prior art, resulting in cumbersome operation, serious catalyst loss, and uneven distribution of catalyst on the reaction tray, and a new method for producing dimethyl maleate is provided

Method used

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  • Method for producing dimethyl maleate
  • Method for producing dimethyl maleate
  • Method for producing dimethyl maleate

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Embodiment 1

[0028] use figure 2 The shown process is applied in a 1,4-butanediol plant with a capacity of 10,000 tons per year. The maleic anhydride stream 1 and the first methanol stream 2 enter the monoesterification reactor R1, and react to obtain monomethyl maleate. Logistics Ⅰ. Stream I and the second methanol stream 3 enter the double esterification fixed-bed reactor R2 from the bottom, contact with the catalyst, and obtain stream 4 containing monomethyl maleate and dimethyl maleate at the top of the tower (ie stream II) ; Among them, 85% by weight of monomethyl maleate in stream I is converted to dimethyl maleate. Stream II enters the double-esterification catalytic distillation reaction tower T1 from the top, and the third stream of methanol enters the double-esterification catalytic distillation reaction tower T1 from the bottom. After contact with the catalyst, the top of the tower obtains the methanol-containing stream 6 and the tower bottom obtains maleic acid. Dimethyl este...

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Abstract

The invention relates to a method for producing dimethyl maleate, mainly for solving the problems in the prior art that the operation is complex, a catalyst is seriously consumed, and the catalyst is not uniformly distributed on a reaction tower plate as a catalyst needs to be frequently replaced. The problems can be well dissolved by adopting the technical scheme disclosed by the invention. According to the technical scheme, the method comprises the following steps of: a) feeding maleic anhydride and a first path of methanol into a single esterification reactor R1, and reacting to obtain a material flow I containing monomethyl maleate; b) feeding the material flow I and a second path of methanol into a double-esterification fixed bed reactor R2, and coming into contact with a catalyst so as to obtain a material flow II containing monomethyl maleate and dimethyl maleate, wherein 80-90wt% of monomethyl maleate in the material flow I is converted into dimethyl maleate; c) feeding the material flow II and a third path of methanol into a double-esterification catalysis distilling reaction tower T1, coming into contact with the catalyst, so as to obtain a material flow containing methanol at the tower top and obtain a dimethyl maleate product from a tower kettle. The method can be applied to industrial production of dimethyl maleate.

Description

Technical field [0001] The invention relates to a method for producing dimethyl maleate. Background technique [0002] Dimethyl maleate is an important organic chemical raw material, especially through catalytic hydrogenation, it can be used to produce 1,4-butanediol, tetrahydrofuran and γ-butyrolactone, which makes maleic anhydride and methanol react to produce maleic acid. The dimethyl acid method has received great attention. This has been described in detail in many patents, such as US4795824, WO90 / 08127, US4751334, WO88 / 00937, US4584419 and so on. [0003] The reaction of maleic anhydride with methanol to produce dimethyl maleate can be described by the following equation. [0004] [0005] In the current industrial production, maleic anhydride and methanol are firstly used in the monoesterification reactor to generate monomethyl maleate, and then the monomethyl maleate and methanol are further reacted in the double esterification reaction tower to obtain dimethyl maleate. e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/60C07C67/08
CPCY02P20/10
Inventor 陈迎李真泽贾震许慎艳陈泱贾微张艺张翼
Owner CHINA PETROLEUM & CHEM CORP
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