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Method for synthesizing glyoxylate through oxidation of glycollate

A glycolic acid ester and glyoxylic acid ester technology is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid esters, etc., which can solve the problems of low selectivity of glyoxylic acid esters and achieve the effect of improving yield

Active Publication Date: 2017-12-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the low selectivity of glyoxylic acid ester produced by oxidative dehydrogenation of glycolic acid ester in the prior art, and a new method for synthesizing glyoxylic acid ester by oxidation of glycolic acid ester is provided

Method used

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  • Method for synthesizing glyoxylate through oxidation of glycollate
  • Method for synthesizing glyoxylate through oxidation of glycollate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Prepare 200ml of ferric nitrate solution I containing 5.6% iron and stir, and the specific surface of 100g is 105m 2 / g alumina carrier was added to solution I and stirred evenly to obtain slurry II, and then ammonia water was added dropwise to slurry II under stirring, and the pH at the end point was controlled to be 8 to obtain slurry IV, and the product was taken out after aging at 80°C for 5 hours Filter, wash the filter cake with ethanol and deionized water, and dry at 120°C. Then prepare 50ml of potassium nitrate solution containing 2.3% potassium, impregnate and dry the filter cake, dry at 120°C, and roast at 500°C to obtain catalyst C1, take catalyst samples for X-fluorescence (XRF) determination of catalyst components, and specific surface BET characterization Test, the test results are shown in Table 1.

Embodiment 2

[0032] Prepare 200ml solution I of ferric nitrate containing 12.8% iron according to the method of [Example 1] and stir, and the specific surface of 100g is 20m 2 / g zirconia carrier was added to solution I and stirred evenly to obtain slurry II, and then ammonia water was added dropwise to slurry II under stirring, and the pH at the end point was controlled to be 8 to obtain slurry IV, which was aged at 80°C for 5 hours and then taken out The product was filtered, and the filter cake was washed with ethanol and deionized water, and dried at 120°C. Then prepare 40ml of magnesium nitrate solution containing 4.8% magnesium, impregnate and dry the filter cake, dry at 120°C, and roast at 500°C to obtain catalyst C2. The catalyst samples are taken for cesium XRF and BET characterization tests. The test results are shown in Table 1.

Embodiment 3

[0034] Prepare 200ml solution I of ferric nitrate containing 2.9% iron according to the method of [Example 1] and stir, and the specific surface of 100g is 250m 2 / g alumina carrier was added to solution I and stirred evenly to obtain slurry II, and then ammonia water was added dropwise to slurry II under stirring, and the pH at the end point was controlled to be 8 to obtain slurry IV, which was aged at 80°C for 5 hours and then taken out The product was filtered, and the filter cake was washed with ethanol and deionized water, and dried at 120°C. Then prepare 50ml of sodium nitrate solution containing 15.9% sodium, impregnate and dry the filter cake, dry at 120°C, and roast at 500°C to obtain catalyst C3. The catalyst samples were taken for XRF and BET characterization tests. The test results are shown in Table 1.

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Abstract

The invention relates to a method for synthesizing glyoxylate through oxidation of glycollate. The invention mainly aims to overcome the problem of low selectivity of glyoxylate in the prior art. The method provided by the invention comprises a reaction step of contacting oxygen-containing gas with glycollate in the presence of a catalyst to produce glyoxylate. The catalyst comprises the following components by weight: a) 0.5 to 30 parts of at least one active component selected from a group consisting of iron and iron oxides; b) 0 to 10 parts of an auxiliary agent which is at least one metal selected from a group consisting of group IA or group IIA elements or oxides thereof; and c) 70 to 99 parts of a carrier. With such a technical scheme, the above problem is overcome, and the method is applicable to industrial production of glyoxylate through oxidation of glycollate.

Description

technical field [0001] The invention relates to a method for synthesizing glyoxylate by oxidation of glycolic acid ester. Background technique [0002] Glyoxylate has both the chemical properties of aldehyde and ester, and can undergo various reactions, especially glyoxylic acid can be prepared by hydrolysis. Glyoxylic acid is an organic intermediate for the synthesis of spices, medicine, food, varnish raw materials, dyes, plastic additives, etc. It can be used to produce oral penicillin, vanillin, mandelic acid and allantoin, etc. Consumption has also been on the rise. [0003] The production methods of glyoxylic acid are different according to the starting materials, and there are about a dozen kinds at present. The most commonly used in industry are oxalic acid electrolytic reduction method, glyoxal nitric acid oxidation method, maleic acid (anhydride) ozonation method, etc. At present, the domestic glyoxylic acid industry has encountered two major problems: first, the...

Claims

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Application Information

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IPC IPC(8): C07C67/313C07C69/67B01J23/78B01J29/72B01J23/745
CPCC07C67/313B01J23/745B01J23/78B01J29/7207B01J2229/18B01J35/613B01J35/615C07C69/716
Inventor 龚海燕刘俊涛孙凤侠
Owner CHINA PETROLEUM & CHEM CORP
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