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A kind of polyacid catalyst and its preparation method and use method

A technology of acid catalyst and multi-acid compound, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, etc., to achieve the effects of low preparation cost, strong practicability, and reduced use cost

Active Publication Date: 2019-08-30
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use in catalyzing the directional conversion of lignocellulose has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh the polyacid compound K with a molar ratio of 1:4 5 [PW 11 TiO 40 ]·6H 2 O and surfactant [C 16 h 33 (CH 3 ) 3 N]Br; the polyacid compound K 5 [PW 11 TiO 40 ]6H 2 Pour O into the reactor, add distilled water with a mass ratio of 6 times, heat to 60°C, stir and dissolve; then add surfactant to it, and age the reaction solution for 7 hours, a white solid precipitates, filters, and rinses the precipitate with distilled water 3 times, until the pH value of the eluate reached 7.1, and a precipitate was obtained; the precipitate was placed in a muffle furnace, and sintered at 170° C. for 2 hours to obtain a polyacid catalyst for directional conversion of lignocellulose, which produced The rate is 50%.

Embodiment 2

[0024] Lignocellulose 1g, 30mg[C 16 h 33 (CH 3 ) 3 N] 5 [PW 11 TiO 40 ]·6H 2 The catalyst of O was put into a high-pressure reactor, and 6 mL of deionized water was added, heated and stirred. The reaction temperature was 100°C, and the reaction time was 8 hours. After the reaction is finished, the reaction mixture is cooled and put into a centrifuge tube for centrifugation. The clear liquid contains the products glucose, xylose and vanillin, and the precipitate contains unreacted lignocellulose and catalyst. The product is extracted twice with methyl isobutyl ketone, the organic phase is distilled under reduced pressure at 40°C to remove methyl isobutyl ketone, and the product vanillin is obtained; the aqueous phase is extracted with ethanol, and the ethanol phase is distilled under reduced pressure at 40°C to obtain ethanol Glucose; the remaining water phase was distilled under reduced pressure at 50° C. to obtain xylose; the yields were 45%, 30% and 61%, respectively...

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Abstract

The invention discloses a polyacid catalyst for catalyzing oriented conversion of lignocellulose and a preparation method thereof. The polyacid catalyst is a polyacid compound with a Keggin structure and can be adopted for catalyzing the lignocellulose to prepare glucose, xylose and oxalaldehyde. The catalyst disclosed by the invention is high in catalytic activity and repeatability and wide in material applicability, and in the whole preparation process, no waste water is generated, and the green and environment-friendly effects are achieved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and application, and specifically relates to a new nanometer solid polyacid catalyst, and at the same time, the invention also relates to the preparation of the nanometer catalyst and its application in the directional conversion of lignocellulose. Background technique [0002] In the 21st century, the development of modern society is facing serious problems such as resource shortage, energy crisis and environmental degradation. The shortage of fossil resources has become one of the bottleneck factors of global economic development. Therefore, all countries have proposed corresponding development strategies. In order to protect the environment and save energy, people focus on renewable resources, and biomass materials and energy gradually surfaced, so the development of biomass industry has become an important development strategy of our country. Biomass exists widely on the earth. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/18B01J27/188C07H3/02C07H1/00C07C45/51C07C47/58C07C49/04
Inventor 时君友王晓红段喜鑫李翔宇
Owner BEIHUA UNIV
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