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 us

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Dissolve copper nitrate or silver nitrate in deionized water; weigh urea according to the molar ratio of urea to nitrate ion in the metal solution of 2.1:1 and prepare it into an aqueous solution; add the urea solution to the mixed solution of copper nitrate and silver nitrate, Stir uniformly; add silica sol to the above mixed solution, and place it at 100~105℃ for 10 hours to uniformly precipitate to ensure complete decomposition of urea, and then age at 95℃ for 20 hours; filter with suction and rinse 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 element composition of the catalyst obtained after roasting was expressed as a percentage of 16%Cu-6%Ag / SiO 2 .

[0020] The catalyst prepared by the above calcination is pressed into a fixed-bed reactor after being pressed into a fixed bed reactor, and reduced with hydrogen at 300°C for 4 hours. After the reduction,...

Example

[0021] Examples 2~5

[0022] The composition of the catalyst in Examples 2 to 5 is the same as that of Example 1, which is 16%Cu-6%Ag / SiO 2 .

[0023] The preparation methods of the catalysts in Examples 2 to 5 are the same as in Example 1, except that the molar ratio of urea to nitrate ions is different from that in 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] Among them, Table 1 shows the molar ratio of urea to nitrate ion and the reaction results in the preparation process of the catalyst in Examples 2-5.

[0026] Table 1

[0027] Example

Example

[0028] Examples 6-18

[0029] The preparation methods of the catalysts in Examples 6-18 are the same as those in Example 1, but the selected metal ions, the ratio of urea to metal ions, and the ratio of urea to nitrate ions are different, so the composition of the prepared catalyst (catalyst The composition of non-oxygen elements is expressed as a percentage).

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

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

[0032] Table 2

[0033] Example

[0034] It can be seen from Table 1 and Table 2 that the catalyst of the present invention can efficiently hydrogenate dimethyl oxalate into methyl glycolate, the conversion rate is as high as 94.5%, and the selectivity of the obtained methyl glycolate is as high as 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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