Catalyst for use in synthesis of dimethyl succinate and application thereof

A technology of dimethyl succinate and dimethyl maleate, applied in the field of chemical engineering, can solve the problems of high equipment investment and operating costs and high reaction pressure, and achieves overcoming the high equipment investment and operating costs, Less by-products and easy separation

Inactive Publication Date: 2010-12-08
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above liquid-phase hydrogenation synthesis method requires high reaction pressure, resulting in high equipment investment and operating costs. Therefore, research and development of new catalysts and corresponding synthesis processes have very important practical significance

Method used

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  • Catalyst for use in synthesis of dimethyl succinate and application thereof
  • Catalyst for use in synthesis of dimethyl succinate and application thereof
  • Catalyst for use in synthesis of dimethyl succinate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Cu / ZnO / Al 2 o 3 Preparation of -1# catalyst:

[0034] 30g Cu(NO 3 ) 2 ·3H 2 O, 27.66g Zn(NO 3 ) 2 ·6H 2 O, 11.62g Al(NO 3 ) 3 9H 2 O was dissolved in 250ml deionized water to make metal ion solution, 32.3g Na 2 CO 3 Dissolve in 290ml deionized water to obtain a precipitant solution. In a water bath at 60°C, under stirring, the metal ion solution is dropped into the precipitant solution at a certain flow rate to carry out the precipitation reaction, and the pH value of the precipitation reaction is 7.0. After the dropwise addition was completed, the mixture was aged at 60° C. for 1 hour. Afterwards, filter and wash to remove impurity ions, dry at 120°C for 12 hours, and heat up to 450°C in a muffle furnace at 3°C / min for 4 hours. The specific surface area of ​​the catalyst is 101m 2 / g, the average pore diameter is 18.4nm.

[0035] Take the Cu / ZnO / Al prepared above 2 o 3 -1# Granulate to 40~60 mesh, with H 2 After reduction, the / Ar mixed gas is used a...

Embodiment 2

[0036] Example 2: Cu / ZnO / Al 2 o 3 Preparation of -2# catalyst:

[0037] 30g Cu(NO 3 ) 2 ·3H 2 O, 31.35g Zn(NO 3 ) 2 ·6H 2 O, 6.97g Al(NO 3 ) 3 9H 2 O was dissolved in 250ml deionized water to make metal ion solution, 32g Na2 CO 3 Dissolve in 290ml deionized water to obtain a precipitant solution. In a water bath at 60°C, under stirring, the metal ion solution is dropped into the precipitant solution at a certain flow rate to carry out the precipitation reaction, and the pH value of the precipitation reaction is 6.9. After the dropwise addition was completed, the mixture was aged at 60° C. for 1 hour. Afterwards, filter and wash to remove impurity ions, dry at 120°C for 12 hours, and heat up to 450°C at 10°C / min in a muffle furnace for 4 hours. The specific surface area of ​​the catalyst is 89m 2 / g, the average pore diameter is 19.3nm.

[0038] Take the Cu / ZnO / Al prepared above 2 o 3 -2#, the specific steps are the same as in Example 1, the difference is that ...

Embodiment 3

[0039] Embodiment 3: Cu / ZnO / Al 2 o 3 Preparation of -3# catalyst:

[0040] 30g Cu(NO 3 ) 2 ·3H 2 O, 29.55g Zn(NO 3 ) 2 ·6H 2 O, 9.3g Al(NO 3 ) 3 9H 2 O was dissolved in 250ml deionized water to make metal ion solution, 32.3g Na 2 CO 3 Dissolve in 290ml deionized water to obtain a precipitant solution. In a water bath at 70°C, under stirring, the metal ion solution is dropped into the precipitant solution at a certain flow rate to carry out the precipitation reaction, and the pH value of the precipitation reaction is 7.0. After the dropwise addition, it was aged for 45h. After that, filter and wash to remove impurity ions, dry at 120°C for 12 hours, raise the temperature to 450°C at 3°C / min in a muffle furnace and keep it for 4 hours. The specific surface area of ​​the catalyst is 100m 2 / g, the average pore diameter is 20nm.

[0041] Synthesis of dimethyl succinate with dimethyl maleate as raw material:

[0042] Take the Cu / ZnO / Al prepared above 2 o 3 -3#, t...

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Abstract

The invention relates to a catalyst for use in the synthesis of dimethyl succinate and application thereof, which belong to the field of chemical industry. The catalyst consists of copper, zinc oxide and alumina serving as active ingredients, and the application of the catalyst in synthesizing dimethyl succinate is also disclosed. Meanwhile, the invention also discloses a method for synthesizing the dimethyl succinate. In the method, the dimethyl succinate is prepared by using monomethyl maleinate as raw material and by hydrogenation in the presence of the catalyst of the invention. Compared with a copper-based catalyst prepared by using traditional methods, the catalyst of the invention has the advantages of neater pore distribution, larger specific surface area, and excellent hydrogenation activity and selectivity, and the target product has the advantages of specific selectivity and good thermal stability. By using the new catalyst, the synthesis method of the invention overcomes the problems of high pressure and high cost and the like of the prior art, and has the advantages of simple process and easily controlled conditions and the like. Therefore, the synthesis method has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a catalyst for synthesizing dimethyl succinate and an application thereof. Background technique [0002] Dimethyl succinate (DMS) (also known as dimethyl succinate) is an important synthetic flavor and food additive, and can also be used as a food preservative. At the same time, it is also an important chemical intermediate, which is widely used in the preparation of various chemicals. Dimethyl succinate is currently mainly obtained through esterification using succinic acid and methanol as raw materials and using concentrated sulfuric acid as a catalyst. However, this method of using concentrated sulfuric acid to catalyze esterification has many side reactions and low yield. It is complicated, and the equipment is severely corroded, and the by-product is highly toxic dimethyl sulfate, which seriously pollutes the environment. [0003] In the prior art,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J21/04C07C69/40C07C67/303C11B9/00A23L1/226A23L3/3517A23L27/20
Inventor 杨菊群赵正康刘文艳张旭红何明康
Owner SHANGHAI HUAYI ENERGY CHEM
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