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Method for preparing monomethyl succinate

A technology for monomethyl succinate and maleic anhydride, which is applied in the field of preparing monomethyl succinate, can solve the problems that the reaction is difficult to carry out thoroughly, product separation and purification is difficult, and large-scale industrialization is difficult, and the equipment is suitable for use. The effect of strong performance, reasonable process and rapid preparation reaction

Inactive Publication Date: 2011-12-07
淮安苏瑞精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this process route is that the reaction speed of synthesizing monomethyl succinate through the esterification reaction of succinic acid and methanol is slow, the reaction is difficult to carry out thoroughly, and the separation and purification of the product is difficult.
[0007] (3) The existing method has the disadvantages of difficult operation control, poor product quality, low purity, long process flow, high production cost, and difficulty in large-scale industrialization

Method used

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  • Method for preparing monomethyl succinate
  • Method for preparing monomethyl succinate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The chemical reactor for the monomethyl ester reaction of the main process equipment is a tank-type stirred chemical reactor, and the electrochemical reduction reactor is a common flat-plate electrochemical reactor. - The liquid separation device is a sedimentation type solid-liquid separation device.

[0037] As shown in the figure, a method for preparing monomethyl succinate is to prepare monomethyl succinate with maleic anhydride and methyl alcohol as raw materials, and the method steps are as follows:

[0038] (1) Dehydration and impurity removal: methanol is added to the dehydration and impurity removal equipment, and alkaline earth metal oxides are added to mix evenly for dehydration and impurity removal operations. The alkaline earth metal oxides are calcium oxide, and the amount of calcium oxide is 1% of the methanol mass;

[0039] (2) Solid-liquid separation: The material obtained in the previous step is subjected to solid-liquid separation in a submerged solid...

Embodiment 2

[0047] Main process equipment The chemical reactor for monomethyl ester reaction is a tubular chemical reactor, and the electrochemical reduction reactor is a three-dimensional electrochemical reactor. The anode chamber and cathode chamber of the electrochemical reduction reactor are separated by a porous isolation membrane, solid-liquid The separation device is a filter type solid-liquid separation device.

[0048] As shown in the figure, a method for preparing monomethyl succinate is to prepare monomethyl succinate with maleic anhydride and methyl alcohol as raw materials, and the method steps are as follows:

[0049] (1) Dehydration and impurity removal: methanol is added to the dehydration and impurity removal equipment, and alkaline earth metal oxides are added to mix evenly for dehydration and impurity removal operations. The alkaline earth metal oxides are magnesium oxide, and the amount of magnesium oxide is 3% of the methanol mass;

[0050] (2) Solid-liquid separation...

Embodiment 3

[0058] Main process equipment The chemical reactor for monomethyl ester reaction is a static mixer, and the electrochemical reduction reactor is a common flat-plate electrochemical reactor. The anode chamber and cathode chamber of the electrochemical reduction reactor are separated by a cationic membrane, and solid-liquid separation The device is a centrifugal solid-liquid separation device.

[0059] As shown in the figure, a method for preparing monomethyl succinate is to prepare monomethyl succinate with maleic anhydride and methyl alcohol as raw materials, and the method steps are as follows:

[0060] (1) Dehydration and impurity removal: Add methanol to the dehydration and impurity removal equipment, add alkaline earth metal oxides and mix evenly to perform dehydration and impurity removal operations. The alkaline earth metal oxides are barium oxide, and the amount of barium oxide is 4% of the methanol mass;

[0061] (2) Solid-liquid separation: The material obtained in th...

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Abstract

The invention relates to a method for preparing monomethyl succinate. The monomethyl succinate is prepared by using maleic anhydride and methyl alcohol as raw materials. The method comprises the steps of: 1, dehydrating and removing impurities: adding the methyl alcohol into a dehydrating and impurity-removing device, adding alkali-earth oxides for dehydrating and removing impurities; 2, carryingout solid-liquid separation: ensuring that liquid-phase materials enter the next step; 3, carrying out hemisuccination: adding the maleic anhydride into the liquid phase materials obtained by the step 2; 4, carrying out vacuum distillation: ensuring that the materials subjected to the methyl alcohol removal enter the next step; 5, carrying out electrochemistry reduction: carrying out electrochemistry hydrogenation reduction reaction on a monomethyl cis-butenedioic acid product, water and sulfuric acid; 6, cooling and crystallizing; 7, carrying out solid-liquid separation: ensuring that solid phase materials enter the next step; and 8, carrying out recrystallization separation to obtain the product of the monomethyl succinate. The invention has simple preparation method, reasonable process, low preparation cost, high product purity, good product quality, high yield and convenient implementation for mass industrialization.

Description

technical field [0001] The invention relates to a method for preparing monomethyl succinate, in particular to a method for preparing monomethyl succinate by using maleic anhydride and methanol as raw materials, and belongs to the field of fine chemicals. Background technique [0002] Mono-methyl succinate (Mono-Methyl Succinate), the Chinese alias is succinic acid monomethyl ester, CAS number is 3878-55-5, molecular formula is C 5 h 8 o 4 , molecular weight 132.11, white crystal at room temperature, melting point 56-59 ℃, boiling point 151 ℃, soluble in organic solvents such as alcohol, ether and benzene, insoluble in water. Monomethyl succinate is an intermediate in organic synthesis and pharmaceutical synthesis, and is also a matrix material for the production of multicolored candles. It has the advantages of smokeless combustion and odorless combustion. [0003] The main raw material of the present invention is maleic anhydride. C 4 h 2 o 3 , the molecular weight i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/04C25B3/25
Inventor 许文林姚干兵王雅琼张淮浩张小兴施国茂
Owner 淮安苏瑞精细化工有限公司
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