Method for producing maleic acid methyl ester

A technology of dimethyl maleate and monomethyl maleate, applied in the production field of dimethyl maleate, can solve the problems of uneven catalyst distribution, frequent catalyst replacement, serious catalyst loss and the like, and saves catalysts , the effect of reducing the number of replacements and avoiding loss

Active Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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. A new production method for dimethyl maleate is provided

Method used

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  • Method for producing maleic acid methyl ester
  • Method for producing maleic acid methyl ester

Examples

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Embodiment 1

[0023] use figure 1 In the process shown, the total number of trays of the double esterification catalytic distillation tower is 30, of which there are 8 trays in the upper section, 9 trays in the middle section, and 13 trays in the lower section. No catalyst is loaded on the last 4 trays in the upper section, middle section and lower section. Four fixed-bed reactors are installed between adjacent trays in the middle section, and a total of 16 fixed-bed reactors are installed in the middle section of the entire catalytic distillation tower. The maleic anhydride stream 1 and the first methanol stream 2 enter the monoesterification reactor R1 to react to obtain a stream 4 containing monomethyl maleate. The stream 4 and the second methanol stream 3 enter the upper section of the double esterification catalytic distillation tower T1 from the side line to obtain the methanol-containing tower overhead stream 5 and the upper rectification effluent stream 6 . Stream 6 enters the midd...

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Abstract

The invention relates to a method for producing maleic acid methyl ester. The problem in the prior art is well solved by utilizing the technical scheme which comprises the following steps of: a) feeding maleic anhydride and a first path of methanol into a single esterification reactor so as to obtain a material flow 4; b) providing a double-esterification catalysis distillation tower T1, wherein the double-esterification catalysis distillation tower T1 comprises three upper, middle and lower sections, at least one fixed bed reactor is arranged outside a tower wall between adjacent tower plates at the middle section; c) feeding the material flow 4 and a second path of methanol into the upper section of the tower T1 from a side line, so as to obtain a material flow 5 and a material flow 6; d) feeding the material flow 6 into the middle section of the tower T1, feeding the material flow 6 into at least the first fixed bed reactor from at least the first layer of tower plate in the middle section, reacting to obtain a material flow 7; feeding the material flow 7 into an adjacent next layer of tower plate to be used as a raw material I for a next fixed bed reactor or to be used as a fed material II of the lower section of the tower T1; e) feeding the fed material II into the lower section of the tower T1, catalyzing and distilling so as to obtain a maleic acid methyl ester product from the tower kettle. The method can be applied to industrial production of the maleic acid methyl ester.

Description

technical field [0001] The present invention relates to a kind of production method of 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, so that maleic anhydride and methanol can be reacted to produce maleic acid The dimethyl ester method has received a great deal of attention. This has been described in detail in many patents, such as US4795824, WO90 / 08127, US4751334, WO88 / 00937, US4584419 and the like. [0003] The reaction of maleic anhydride with methanol to prepare dimethyl maleate can be described by the following equation. [0004] [0005] At present, during industrial production, maleic anhydride and methanol generate monomethyl maleate in the monoesterification reactor, and then monomethyl maleate reacts further with methanol in the double esterification reaction tower to obtai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/60C07C67/08
Inventor 陈迎李真泽贾微贾震陈泱张艺张翼许慎艳
Owner CHINA PETROLEUM & CHEM CORP
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