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Synthesis process of dimethyl maleate

A technology of dimethyl maleate and monomethyl maleate, applied in the field of organic synthesis, can solve the problems of short contact time and inability to fully participate in the reaction, so as to increase production efficiency, reduce production cost, improve reaction efficiency and The effect of esterification rate

Inactive Publication Date: 2017-05-10
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction liquid phase monomethyl maleate and methanol gas enter from the bottom and the other enters from the top, and methanol has a low boiling point, resulting in short contact time and cannot fully participate in the reaction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of synthetic technique of dimethyl maleate, comprises the following steps:

[0019] 1) Add maleic anhydride and methanol continuously into the monoesterification reactor at a molar ratio of 1:1.3 and react at 85°C to form monomethyl maleate, keeping 1 / 3~2 / 3 of the monoesterification reactor The liquid level, the monomethyl maleate that generates is continuously pumped into the 11-layer tray catalytic esterification tower;

[0020] 2) Monomethyl maleate enters the catalytic esterification tower from the top of the first tray of the catalytic esterification tower at a flow rate of 1.3t / h, and methanol vapor flows from the upper liquid level of each tray at a rate of 2t / h The following enters the catalytic esterification tower, the temperature at the top of the tower is 60-90°C, and the temperature in the tower is 105-120°C. A strong acid ion exchange resin is distributed on each layer of the tray, and monomethyl maleate and methanol vapor are in each layer. Dimeth...

Embodiment 2

[0023] A kind of synthetic technique of dimethyl maleate, comprises the following steps:

[0024] 1) Add maleic anhydride and methanol continuously into the monoesterification reactor at a molar ratio of 1:1.1 and react at 70°C to form monomethyl maleate, keeping 1 / 3~2 / 3 of the monoesterification reactor The liquid level, the monomethyl maleate that will generate is continuously pumped into the 15-layer tray catalytic esterification tower;

[0025] 2) Monomethyl maleate enters the catalytic esterification tower from the top of the first tray of the catalytic esterification tower at a flow rate of 1.5t / h, and methanol vapor flows from the upper liquid level of each tray at a rate of 2t / h The following enters the catalytic esterification tower, the temperature at the top of the tower is 60-90°C, and the temperature in the tower is 105-120°C. A strong acid ion exchange resin is distributed on each layer of the tray, and monomethyl maleate and methanol vapor are in each layer. Di...

Embodiment 3

[0028] A kind of synthetic technique of dimethyl maleate, comprises the following steps:

[0029] 1) Add maleic anhydride and methanol continuously into the monoesterification reactor at a molar ratio of 1:1.5 to react at 95°C to form monomethyl maleate, keeping 1 / 3~2 / 3 of the monoesterification reactor The liquid level, the monomethyl maleate that generates is continuously pumped into the 20-layer tray catalytic esterification tower;

[0030] 2) Monomethyl maleate enters the catalytic esterification tower from the top of the first tray of the catalytic esterification tower at a flow rate of 1.3t / h, and methanol vapor flows from the upper liquid level of each tray at a rate of 3t / h The following enters the catalytic esterification tower, the temperature at the top of the tower is 60-90°C, and the temperature in the tower is 135-145°C. A strong acid ion exchange resin is distributed on each layer of the tray, and monomethyl maleate and methanol vapor are in each layer. Dimethy...

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Abstract

The invention discloses a synthesis process of dimethyl maleate. The synthesis process comprises steps as follows: maleic anhydride and methanol are subjected to a reaction in a mono-esterification reaction kettle at the temperature of 70-100 DEG C, and monomethyl maleate is generated; monomethyl maleate enters a catalytic esterification tower from a tower, methanol steam enters the catalytic esterification tower from the position below upper liquid level of each layer of tower plate and is contacted with monomethyl maleate and a solid catalyst on the tower plate, and dimethyl maleate is generated. With the adoption of continuous production, energy utilization rate is increased by full use of waste heat of the esterification reaction; with the adoption of multiple methanol steam inputs, methanol steam is distributed on each tower plate, each tower plate forms one small reactor in a boiling state, the contact area of monomethyl maleate and methyl alcohol is increased, the contact time of monomethyl maleate and methyl alcohol is prolonged, the problem of uneven distribution of methanol in the tower due to liquefied reflow of the methyl alcohol steam in a rising process is solved, the reaction efficiency and the esterification rate are increased, the methanol utilization rate is increased, the production cost is reduced while the yield is increased, and the synthesis process is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and relates to a synthesis process of dimethyl maleate, in particular to an esterification reaction of maleic anhydride and methanol to synthesize dimethyl maleate. Background technique [0002] Dimethyl maleate is a colorless viscous liquid, which can be used as an important synthetic raw material and intermediate for coatings, adhesives, optical materials, anti-shrinkage finishing agents, and water treatment agent PBTCA. [0003] The traditional production method of dimethyl maleate mostly adopts maleic anhydride as raw material, and carries out esterification reaction with methanol under the catalysis of sulfuric acid. Although this production process has high catalytic activity and low price of catalyst sulfuric acid, there are side reactions Many, the product is easily isomerized into dimethyl fumarate, the equipment is severely corroded, and the follow-up treatment is complicated. Later, a...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/60
CPCC07C67/08C07C69/60
Inventor 程终发王东海万振涛宋盟盟任泽旭张秀华
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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