Method for preparing alkylglycoside by using solid-carrying heteropolyacid catalyst

A technology for immobilizing heteropolyacids and alkyl glycosides, which is applied in the field of preparation of alkyl glycosides, can solve the problems of poor quality of alkyl glycosides, low glucose conversion rate, easy polymerization, etc., and achieves no environmental pollution, simple operation, selective effect

Inactive Publication Date: 2008-08-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When these catalysts are used to prepare alkyl glycosides, the conversion rate of glucose is low, it is easy to polymerize, and it is easy to produce colored substances, resulting in poor quality of alkyl glycosides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 100g of anhydrous glucose, 185g of n-butanol and 5g of immobilized phosphotungstic acid (22.5% of immobilized capacity) into a three-necked flask with a stirrer, heat and stir at 100°C, and continue the reaction for 1.5h after the reaction solution is clarified. After the reaction, the catalyst was filtered off. After cooling slightly, 186.3 g of dodecyl alcohol was added to the above reaction system, and heated and stirred at 120° C. for 2 h. After the reaction is finished, cool down, add 2 times the volume of water to the reaction solution for extraction, and then evaporate excess water and n-butanol at 2 mmHg to obtain dodecyl glucoside.

Embodiment 2

[0019] Add 100g of anhydrous glucose, 296.4g of n-butanol and 8g of immobilized silicotungstic acid (14.5% of immobilized capacity) into a three-neck flask with a stirrer, heat and stir at 130°C, and continue the reaction for 2 hours after the reaction solution is clarified. After the reaction, the catalyst was filtered off. After cooling slightly, 198g of decanol was added to the above reaction system, and heated and stirred at 120°C for 3h. Cool after the reaction, add 4 times the volume of the reaction liquid H 2 O-NaCl mixed solution extraction (wherein H 2 (0:NaCl=1:0.05), and then evaporate excess water and n-butanol under 10mmHg to obtain dedecyl glucoside.

Embodiment 3

[0021] Add 100g of anhydrous glucose, 111.2g of n-butanol and 10g of immobilized phosphotungstic acid (34.5% of immobilized capacity) into a three-necked flask with a stirrer, heat and stir at 90°C, and continue the reaction for 3 hours after the reaction solution is clarified. After the reaction, the catalyst was filtered off. After cooling slightly, 195 g of octanol was added to the above reaction system, and heated and stirred at 120° C. for 2 h. Cool after the reaction, add 3 times the volume of the reaction liquid H 2 O-NaCl mixed solution extraction (wherein H 2 O:NaCl=1:0.1), and then evaporate excess water and n-butanol under 4mmHg to obtain octaalkyl glycoside (octyl glycoside).

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PUM

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Abstract

A preparation of alkyl glycoside which uses solid supported heteropoly acid as catalyst, which pertains to field of preparation of alkyl glucoside. The invention use heteropoly acid solid supported by active carbon as catalyst, execute glycosidation with butanol and glucose, alcohol exchange with C8-C12 alcohol to prepare C8-C12 alkyl glucoside; solid support phosphotungstic acid or silicotungstic acid with a Keggin structure on active carbon to form strong acid catalyst; glycosidation of anhydrous glucose and butanol is carried out in presence of heteropoly acid to obtain n-butyrate glycoside, then alcohol exchange with C8-C12 long chain aliphatic alcohol, after extraction separation and vacuum distillation, C8-C12 alkyl glycoside is obtained. Advantages of the invention is that catalyst is high in activity and selectivity, and is reusable. The Preparation is simple, neutralization, albefaction and decolouration are eliminated. The obtained product is achroic or approximately achroic, transparent, no objectionable odor, and storage-stable.

Description

technical field [0001] The invention discloses a preparation method of an alkyl glycoside using a solid-carrying heteropolyacid catalyst, belonging to the technical field of preparation of the alkyl glycoside. Background technique [0002] Alkyl glycoside is a highly efficient, non-toxic, fully biodegradable nonionic surfactant. It has excellent surface properties, low surface tension, strong foaming power, fine and stable foam, and little irritation to the human body. Alkyl glycosides are widely used in dishwashing detergents, cosmetics, food additives, plastic and building materials additives, etc. [0003] There are two main methods for the industrial production of alkyl glycosides. The first is a one-step method, that is, the direct glycoside method: under the action of an acidic catalyst, glucose directly undergoes a glycoside reaction with a long-chain fatty alcohol, and then undergoes neutralization, distillation, and bleaching to obtain an alkyl glycoside. The fea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/04B01J27/19B01J23/30
Inventor 刘士荣陈明清刘湘龚雁毛明富
Owner JIANGNAN UNIV
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