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A kind of method that catalytic oxidation glycerin prepares tartronic acid

A propylene glycol acid, catalytic oxidation technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylates, etc., can solve the problems of increasing the difficulty of separation and catalyst action mechanism research, and achieve a variety of preparation methods. , The preparation method is simple, the stability is good

Active Publication Date: 2021-09-24
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned reactions are all carried out under alkaline conditions. The presence of a strong base makes some products in the reaction system convertible to each other, thereby covering up the product selectivity nature of the catalyst and increasing the product analysis, separation and catalyst action mechanism. Difficulty of research (Chinese Journal of Catalysis, 2017, 38, 537-544)

Method used

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  • A kind of method that catalytic oxidation glycerin prepares tartronic acid

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Effect test

Embodiment 1

[0039] One, the preparation of catalyst:

[0040] (1) Using silicon spheres as hard templates, phenolic resin as carbon source, and melamine as nitrogen source to prepare nitrogen-doped mesoporous carbon materials (the molar ratio is 2:1), and the obtained nitrogen content is 13.73%.

[0041]The specific steps are: add 3.67g phenol into a 250ml Erlenmeyer flask, add 50ml 200mmol / L NaOH solution and stir for 10min, then add 6.33g 37% formaldehyde dropwise, then stir and heat in a 70°C water bath for 40min. Then add 4.92g melamine and 9.50g formaldehyde (the molar ratio of melamine and phenol is 1:1; or add 9.84g melamine and 12.67g formaldehyde, the molar ratio of melamine and phenol is 2:1), continue heating and stirring for 30min, add 50g 30% silica sol (Ludox SM-30), stir evenly, transfer the mixed solution to a sealed bottle, put it in an oven at a constant temperature of 80°C for 3 days, open the bottle cap and dry it for one day, take out the solid, grind it into powder, ...

Embodiment 2

[0052] 1. Preparation of catalyst

[0053] Catalyst preparation method is identical with embodiment 1.

[0054] 2. Catalytic oxidation of glycerol to produce tartronic acid

[0055] Add 50mL of 300mmol / L glycerol aqueous solution and Pt-based catalyst (the molar ratio of glycerol / Pt is 100) to the reactor, stir, and pass O at room temperature (25°C). 2 (10 mL / min) for oxidation reaction for 5 hours. After the catalyst was separated by centrifugation, the supernatant was quantitatively analyzed, and the conversion rate of glycerin was 94.2%, and the yield of tartronic acid was 72.4%.

Embodiment 3

[0057] 1. Preparation of catalyst

[0058] Catalyst preparation method is identical with embodiment 1.

[0059] 2. Catalytic oxidation of glycerol to produce tartronic acid

[0060] Add 50mL of 300mmol / L glycerin aqueous solution and Pt-based catalyst (the molar ratio of glycerol / Pt is 250) to the reactor, stir, and pass O under mild conditions (40°C). 2 (10 mL / min) for oxidation reaction for 3 hours. After the catalyst was separated by centrifugation, the supernatant was quantitatively analyzed, and the conversion rate of glycerin was 91.3%, and the yield of tartronic acid was 63.3%.

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Abstract

The invention discloses a method for preparing tartronic acid by catalyzing the oxidation of glycerol, using potassium-modified nitrogen-doped mesoporous carbon material as a catalyst to support Pt, and catalyzing the oxidation of glycerol under mild and non-alkaline conditions to prepare tartronic acid in one step. The mild conditions are: the reaction temperature is lower than 60° C. and normal pressure conditions. Modification of nitrogen-doped mesoporous carbon materials with potassium species improves the basicity of the carrier; secondly, a supported Pt-based catalyst is prepared by using the above-mentioned potassium-modified nitrogen-doped mesoporous carbon materials as a carrier, which improves the alkalinity of the Pt catalyst. Catalytic oxidation activity; third, under mild, non-alkaline conditions, catalyzed oxidation of glycerol to prepare tartronic acid in one step, avoiding the use of alkali and the occurrence of related side reactions.

Description

technical field [0001] The invention relates to a method for tartronic acid, in particular to a method for catalytically oxidizing glycerin to prepare tartronic acid. Including the preparation of potassium-modified nitrogen-doped mesoporous carbon material-loaded Pt catalyst and its method of catalyzing the oxidation of glycerol to prepare tartronic acid. This method can achieve efficient catalytic oxidation of glycerol in one step under relatively mild temperature and non-alkaline conditions. Protonate. It belongs to the field of chemical engineering. Background technique [0002] Tartronic acid is a platform chemical with high added value, which is widely used in the field of medicine. It can inhibit the conversion of carbohydrates into fat in the human body, prevent the accumulation of body fat, and has the effect of losing weight and preventing coronary heart disease (Green Chemistry, 2011, 13, 1960-1979). Industrially, tartronic acid is mainly prepared from maleic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/235B01J23/58B01J27/24C07C59/245
CPCB01J23/58B01J27/24C07C51/235C07C59/245
Inventor 谭华伍世超詹彤马浩李凝刘卫兵李德豪
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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