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Process for preparing glyceric acid by one-step of direct catalytic oxidation with oxygen

A technology of catalytic oxidation and molecular oxygen, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylates, etc., can solve the problem of inability to realize one-step synthesis of glyceric acid, and achieve high yield, simple separation and simple operation. Effect

Inactive Publication Date: 2008-10-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the reaction must be carried out under alkaline conditions, the final product obtained is glyceride, which requires further acidification and hydrolysis to obtain glyceric acid, and the one-step synthesis of glyceric acid cannot be realized.

Method used

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  • Process for preparing glyceric acid by one-step of direct catalytic oxidation with oxygen

Examples

Experimental program
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Embodiment 1

[0026] Example 1. Disperse 5g of activated carbon in 75ml of water, then slowly add a certain concentration of chloroplatinic acid as a precursor solution to the suspension of activated carbon, and control the loading of the metal to 5wt%. , stirred and impregnated for 3.5 hours, then added a certain amount of formaldehyde at 50°C, controlled the molar ratio of formaldehyde to metal to about 15:1, and controlled the pH of the solution during the reduction process at about 8, and stirred for 1 hour. It was then filtered, washed several times with deionized water, and dried under vacuum at 60 °C to obtain a 5% Pt / C catalyst.

[0027] Add 0.5 g of Pt / C catalyst into a 100 ml three-necked flask, accurately weigh 5.0 g of glycerol, dilute with deionized water and transfer to a three-necked flask, the total volume of the reaction solution is about 50 ml. The temperature of the water bath was raised to 60°C, and oxygen was introduced for bubbling under magnetic stirring, and the mola...

Embodiment 2

[0028] Embodiment 2, using activated carbon as a carrier, still adopting chloroplatinic acid as a precursor, controlling the loading of metals to be 1wt%, 3wt%, and 7wt%, respectively, the loading method of metals and the catalytic reaction conditions of glycerol are the same as in Example 1. The results are summarized in Table 1.

Embodiment 3

[0029] Embodiment 3, using activated carbon as a carrier, using chloroauric acid as a precursor, controlling the loading of metal Au to 5 wt%, the metal loading method and glycerol catalytic reaction conditions are the same as in Example 1. The results are summarized in Table 1.

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Abstract

The invention provides a method for preparing glyceric acid in one step by directly adopting dioxygen catalytic oxidation, which takes glycerine as the raw material, under the condition of the presence of the oxygen and under the action of activated carbon or graphite loaded metallic catalyst, to prepare the glyceric acid in one step in a batch type. The active component of the catalyst is a single reactive metal of Pt, Cu, Fe, Ni, Cr, Zn, Ru, Re, Au, Ag, Mn, and Sn, or a double compound of the above metals or an alloyed bi-component. The method for preparing the glyceric acid ensures the conversion rate of the glycerine to be 70 to 92 percent, and the yield coefficient of the glycerine to be 40 to 66 percent. The method has the good advantages that the cost is low, the percentage yield is high, the performance of the catalyst is steady, the operation is simple, the separation is simple, and no environmental contamination occurs.

Description

technical field [0001] The invention relates to a reaction process for preparing glyceric acid by directly oxidizing glycerin with molecular oxygen under the action of a metal catalyst and a catalyst capable of realizing the process. Background technique [0002] Glyceric acid (Glyceric acid, referred to as GLYA), the molecular formula is CH 2 OHCHOHCOOH, is a fatty acid analogue of glycerol. The substance is viscous gel, miscible with water, ethanol and acetone, almost insoluble in ether. Pure glyceric acid has a melting point of 134-135°C. [0003] Glyceric acid is an important intermediate product in the synthesis of physiologically active substances and amino acids. It is an important research direction in the field of life sciences to use this substance as a raw material to synthesize lecithin analogues for the study of living organisms. In addition, glyceric acid is an important drug and pharmaceutical intermediate. For example, glyceric acid can be used as a raw ma...

Claims

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Application Information

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IPC IPC(8): C07C59/10C07C51/23B01J23/60B01J23/89B01J23/38
CPCY02P20/584
Inventor 梁丹高静陈平侯昭胤郑小明
Owner ZHEJIANG UNIV
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