Application of tungsten-based solid acid in lactic acid and lactate preparation using biomass and saccharides

A technology of biomass and solid acid, which is applied in the preparation of carboxylate, carboxylate, and organic compounds, etc. It can solve the problems of long preparation period of Sn-β molecular sieve, difficult catalytic conversion of biomass, complex preparation process, etc. , achieving good application prospects, favorable cost, and simple preparation

Active Publication Date: 2018-10-16
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation period of Sn-β molecular sieve is long, the preparation process is complicated, and the cost is high, so it is difficult to be used in large-scale catalytic conversion of biomass.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Ba-WO 3 Catalyst preparation: Take 0.1mol lithium tungstate and 0.5mol barium chloride into 4L deionized water, add 3mol / L hydrochloric acid to adjust the pH value to 1.5 and stir for 1h; In the synthesis kettle, synthesize at 160°C for 72h, take out the synthesized solid, wash and dry to obtain Ba-WO 3 catalyst.

[0028] (2)Ba-WO 3 Catalytic conversion of biomass sugars by catalyst: take 0.2gBa-WO 3 Catalyst, 4g of fructose, 20ml of methanol, 20ml of methyl lactate were added to the autoclave, and after purging the air with nitrogen, the reaction was carried out at 150°C for 300min to obtain a yield of methyl lactate (relative to the fructose raw material) of 73mol%.

Embodiment 2

[0030] (1) Ca-WO 3 Catalyst preparation: Take 0.5mol sodium tungstate, 0.5mol potassium tungstate and 0.6mol calcium chloride into 4L deionized water, add 3mol / L nitric acid to adjust the pH value to 1 and stir for 3h; In the hydrothermal synthesis kettle of tetrafluoroethylene, synthesize at 240°C for 3h, take out the synthesized solid, wash and dry to obtain Ca-WO 3 catalyst.

[0031] (2) Ca-WO 3 Catalytic conversion of biomass sugars by catalyst: Take 0.1g Ca-WO 3 Catalyst, 5g of glucose, and 40ml of water were added to the autoclave, and after purging the air with nitrogen, the reaction was carried out at 160° C. for 280 minutes to obtain a yield of lactic acid (relative to the glucose raw material) of 88 mol%.

Embodiment 3

[0033] (1) Pb-WO 3 Catalyst preparation: Take 2.4mol potassium tungstate, 0.6mol tungsten chloride and 1.5mol lead nitrate into 4L deionized water, add 3mol / L hydrochloric acid and sulfuric acid with a molar ratio of 1:1 mixed acid to adjust the pH value to 3 and Stir for 3h; transfer the above solution to a hydrothermal synthesis kettle with polytetrafluoroethylene, synthesize at 180°C for 20h, take out the synthesized solid, wash, and dry to obtain Pb-WO 3 catalyst.

[0034] (2)Pb-WO 3 Catalyst for catalytic conversion of biomass sugars: take 0.4gPb-WO 3 Catalyst, 3g of maltose, and 40ml of ethanol were added to the autoclave, and after purging the air with nitrogen, the reaction was carried out at 190° C. for 100 min to obtain a yield of ethyl lactate (relative to the raw material of maltose) of 81 mol%.

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PUM

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Abstract

The invention relates to the technical field of chemical catalyzing, in particular to application of tungsten-based solid acid in lactic acid and lactate preparation using biomass and saccharides. Tungsten-containing salt is allowed to have hydro-thermal synthesis reaction with the chlorine salt, sulfate, nitrate, phosphate and oxalate of barium, calcium, lead, aluminum, chromium, erbium, tin, germanium, niobium and tantalum to prepare a multiple-component tungsten-based solid acid catalyst. The multiple-component tungsten-based solid acid catalyst is simple to prepare, cheap, good in hydrothermal stability, easy to recycle, capable of catalyzing monosaccharides such as fructose and glucose to convert into the lactic acid or lactate, capable of catalyzing polysaccharides such as sucrose, maltose, starch and cellulose even biomass such as wood and corn straw containing cellulose to have hydrolysis reaction so as to prepare the lactic acid or lactate, promising in application prospect and the like, multi-step reaction catalyzing by one single catalyst is achieved, and the range of the biomass and the saccharides which can be converted by the catalyst is wide.

Description

technical field [0001] The invention relates to the technical field of chemical catalysis, in particular to the application of a tungsten-based solid acid in the preparation of lactic acid and lactate from biomass sugars. Background technique [0002] Lactic acid is an important chemical raw material, which is widely used in food, chemical industry, medicine, cosmetics and other fields. Lactic acid can be used as a raw material for the synthesis of polylactic acid (PLA). PLA can be recycled through biodegradation to reduce pollution to the natural environment. In addition, methyl lactate, ethyl lactate, and propyl lactate are also important fine chemical raw materials. They can be used as alcohol additives, lubricants for compressed pharmaceutical tablets, and pharmaceutical intermediates. At the same time, they are non-toxic , good solubility, non-volatile, biodegradable and other characteristics, it is an excellent solvent with great development value and application pros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/00C07C51/367C07C67/08B01J23/30C07C59/08C07C69/68
CPCB01J23/30C07C51/00C07C51/367C07C67/08C07C59/08C07C69/68
Inventor 石宁罗文艳何雄王贵
Owner GUIZHOU INST OF TECH
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