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A Catalyst Catalyzing the Conversion of Complex Sugars to Produce Lactate

A catalyst and lactic acid ester technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, organic compounds, etc., can solve problems such as different preparation methods, restrictions on lactic acid esters, and different selectivities of lactic acid esters, and achieve application The effect of wide range and easy separation and recovery

Inactive Publication Date: 2021-03-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tin-containing silicate molecular sieves with different configurations have different selectivity to lactate; molecular sieves with the same configuration have different preparation methods, and there are also large differences in selectivity to lactate, which seriously restricts the use of chemical catalysts. Practical application of the method to prepare lactate from sugar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The commercial Beta molecular sieve (BEA configuration) was treated with 13 mol / L nitric acid at 100°C for 20 hours to dealuminate (solid-liquid ratio 1 g / 20 mL), and the dealuminated Beta molecular sieve and SnCl 4 ·5H 2 O mixed and ground evenly, and obtained Sn-Beta molecular sieve after drying and high-temperature roasting.

[0023] Using the prepared Sn-Beta (0.1 g) as the main catalyst, commercial WO 3 Solid (0.1 g) was used as cocatalyst, glucose (0.4 g) was used as raw material, methanol (15 mL) was used as reaction solvent, N 2 Under the atmosphere (0.4 MPa), the reaction was carried out at 160 °C for 5 h, and 52 % (the yields were all carbon yields) of methyl lactate was obtained.

Embodiment 2

[0025] Using ethyl silicate as Si source, SnCl 4 ·5H 2 O is the source of Sn. Sn-Beta molecular sieves with a Sn content of 1 wt% were synthesized by hydrothermal method, and used after high-temperature calcination to remove the template agent.

[0026] Make ammonium tungstate into an aqueous solution, add Sn-Beta molecular sieve (1 g), control the W / Sn molar ratio to 1, stir evenly, dry at 90°C for 10 hours, and roast at 500°C for 6 hours to obtain W dispersed in Sn-Beta Catalysts on molecular sieves. Take 0.1 g of the catalyst and catalyze the conversion of glucose under the reaction conditions described in Example 1 to obtain methyl lactate with a yield of 50%.

Embodiment 3

[0028] Using the method in Example 1, the USY (FAU type) molecular sieve containing Al was dealuminated and tin supplemented to obtain a Sn-USY molecular sieve. With 0.1 g Sn-USY molecular sieve as the main catalyst, 0.1 g WO 3 Solid is procatalyst, and all the other reaction conditions are with embodiment 1, obtain the methyl lactate yield of 50% from glucose.

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Abstract

The invention provides a catalyst for preparation of lactic acid ester by catalyzing conversion of complex sugars. The catalyst is composed of a tin-containing silicate molecular sieve as a main catalyst and WO3 as a co-catalyst. The catalyst can catalyze the conversion of sugars, especially hexose, into lactic acid ester in high yield. The catalyst can be easily separated and recovered, and can still obtain good results for a high-concentration sugar solution.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for catalyzing the efficient conversion of complex sugars such as sucrose, glucose, fructose and xylose to prepare lactate. Background technique [0002] Lactic acid esters are widely used in food, cosmetics, chemicals and pharmaceutical industries. As a raw material for the preparation of biodegradable plastic polylactic acid, its demand is increasing year by year. At present, sucrose or glucose is mainly used as raw materials to obtain crude lactic acid through microbial fermentation, and the crude lactic acid is then subjected to esterification to obtain lactic acid ester. However, during the fermentation process, it is necessary to continuously add quicklime to maintain the pH value of the fermentation tank to maintain the activity of microorganisms. To obtain crude lactic acid, it is necessary to add a large amount of sulfuric acid for acidification, resulting i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01J29/16B01J29/48B01J29/03B01J29/04C07C69/68C07C67/00
CPCB01J29/0341B01J29/045B01J29/166B01J29/48B01J29/78B01J29/7815B01J2229/183B01J2229/186C07C67/00C07C69/68
Inventor 杨晓梅周利鹏芦天亮
Owner ZHENGZHOU UNIV
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