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Catalyst for hydrogenation of dimethyl oxalate to prepare methyl glycolate, preparation method and application thereof

A technology of dimethyl oxalate and methyl glycolate, which is applied in the direction of carboxylate preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the difficulties of large-scale production, large pollution, Corrosion resistance and other problems, to achieve the effect of high catalyst activity and stability, simple preparation method and good synthesis repeatability

Active Publication Date: 2011-01-26
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the synthesis of glycolic acid in foreign countries mainly adopts the carbonylation route with formaldehyde as the raw material. The requirements for corrosion resistance and high pressure resistance of equipment are high, and the one-time investment is large, and large-scale production is difficult; while domestically, chloroacetic acid and caustic soda are still used. Glycolic acid is produced by the process route of solution mixing reaction and esterification. The production of chloroacetic acid adopts acetic acid as raw material, sulfur as catalyst, and chlorine production. Although the process is simple, the production process is severely corroded, polluted, and costly. As a result, the method cannot be applied on a large scale industrially

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Copper nitrate or silver nitrate is dissolved with deionized water; According to the molar ratio of urea and nitrate ion in the metal solution is 2.1: 1, take urea and be prepared into aqueous solution; Add urea solution in the mixed solution of copper nitrate and silver nitrate, Stir evenly; add silica sol to the above mixed solution, and place it at 100-105°C and stir for 10 hours for uniform precipitation to ensure complete decomposition of urea, then age at 95°C for 20 hours; filter with suction and wash with deionized water The obtained sample was dried at 90°C for 24 hours; then calcined in a muffle furnace at 450°C for 5 hours; the non-oxygen composition of the catalyst obtained after roasting was expressed as 16%Cu-6%Ag / SiO in percentage 2 .

[0020] The catalyst prepared by the above-mentioned roasting is pressed into a fixed-bed reactor, and reduced with hydrogen at 300°C for 4 hours. After the reduction, the temperature is lowered to the reaction temperature,...

Embodiment 2～5

[0022] The composition of catalyst among the embodiment 2~5 is identical with embodiment 1, is 16%Cu-6%Ag / SiO 2 .

[0023] The preparation method of the catalyst in Examples 2-5 is the same as Example 1 except that the molar ratio of urea and nitrate ion is different from Example 1.

[0024] The reduction and reaction conditions of the catalyst in Examples 2 to 5 are also the same as in Example 1.

[0025] Wherein, Table 1 is the molar ratio and reaction result of urea and nitrate ion in the catalyst preparation process in Examples 2-5.

[0026] Table 1

[0027] Example

Embodiment 6～18

[0029] The preparation method of catalyst among the embodiment 6~18 is identical with embodiment 1, but the ratio of selected metal ion and urea and metal ion, the ratio of urea and nitrate ion are different to some extent, thus the composition of the catalyst made (catalyst The composition of non-oxygen elements is expressed as a percentage) differently.

[0030] The reduction and reaction conditions of the catalyst in Examples 6-18 are the same as in Example 1.

[0031] Table 2 is the catalyst composition and reaction results of Examples 6-18.

[0032] Table 2

[0033] Example

[0034] Can find out from above-mentioned table 1, table 2: catalyst of the present invention can hydrogenate dimethyl oxalate efficiently and be converted into methyl glycolate, conversion rate is up to 94.5%, and the selectivity of prepared methyl glycolate is up to 92.5%.

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PUM

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Abstract

The invention relates to a catalyst for hydrogenation of dimethyl oxalate to prepare methyl glycolate, a preparation method and application thereof. The catalyst is prepared by using Cu as main active component and using one or more of Ag, Mg, Au, Ru, Rh, Pd, Pt, Re, Ni, Co, Cr, Zn and Zr as additive through a urea decomposition-homogeneous coprecipitation process, wherein the mass fraction of Cuis 0 to 30 percent, the mass fraction of the additive is 0 to 20 percent, and the rest is carrier silica. The method for preparing the catalyst is simple, and good in synthesis repetitiveness, and when being applied for hydrogenation of dimethyl oxalate to prepare methyl glycolate, the catalyst is high in activity and stability, and the selectivity of methyl glycolate is high.

Description

technical field [0001] The invention relates to a catalyst for preparing methyl glycolate by hydrogenation of dimethyl oxalate and its preparation method and application, in particular to the application of the catalyst in the preparation of methyl glycolate by hydrogenation of dimethyl oxalate. Background technique [0002] Methyl glycolate (MG) is a class of important chemical products and intermediates, widely used in many fields such as chemical industry, medicine, pesticide, feed, dyestuff and spices, mainly including: 1) as fiber, resin, rubber, semiconductor Excellent solvent in production; 2) further hydrogenation reduction to ethylene glycol; 3) carbonylation to produce (mono) methyl malonate; 4) ammonia solution to produce glycine; 5) oxidative dehydrogenation to produce methyl glyoxylate; 6) Hydrolysis to produce glycolic acid, etc. Among the many uses of methyl glycolate, the hydrolysis of glycolic acid has great development value and broad market prospects. ...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/72C07C69/675C07C67/31
Inventor 宁春利廖湘洲卢磊张春雷
Owner SHANGHAI HUAYI GRP CO
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