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Method for preparing isosorbide by sorbitol dehydration

A technology for isosorbide and sorbitol, applied in the field of isosorbide preparation from sorbitol, can solve the problems of harsh catalytic conditions, low isosorbide yield and the like, and achieves the advantages of good thermal stability, high catalytic efficiency and mild reaction conditions. Effect

Active Publication Date: 2019-05-10
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic conditions of existing solid acid catalysts are harsh, and the yield of isosorbide is low

Method used

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  • Method for preparing isosorbide by sorbitol dehydration
  • Method for preparing isosorbide by sorbitol dehydration

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 1g coconut shell activated carbon, 2g p-aminobenzenesulfonic acid and 1g sodium hydroxide into 150ml deionized water and stir thoroughly. After heating to 80℃, add 1g sodium nitrite and 5ml dilute hydrochloric acid (2mol / L ), after reacting for 10 hours, filtering, washing, and drying at 100° C. to remove water in the solid, to obtain the carbon-based catalyst A functionally modified with benzenesulfonic acid groups.

Embodiment 2

[0020] Weigh 1g of mesoporous carbon, 2g of p-aminobenzenesulfonic acid and 1g of potassium hydroxide into 150ml of deionized water and stir thoroughly. After heating to 20℃, add 1g of sodium nitrite and 5ml of dilute hydrochloric acid (2mol / L) to the mixture. After reacting for 10 hours, it is filtered, washed, and dried at 100°C to obtain the carbon-based catalyst B functionally modified with benzenesulfonic acid groups.

Embodiment 3

[0022] Weigh 1g of mesoporous carbon, 4g of p-aminobenzenesulfonic acid and 1g of calcium hydroxide into 150ml of deionized water and stir thoroughly. After heating to 60℃, add 2g of sodium nitrite and 5ml of dilute hydrochloric acid (2mol / L) to the mixture. After reacting for 15 hours, it is filtered, washed, and dried at 100°C to obtain the carbon-based catalyst C functionally modified with benzenesulfonic acid groups.

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Abstract

The invention discloses a method for preparing isosorbide by sorbitol dehydration. Benzene sulfonic acid group functionalized modified carbon-based solid acid serves as a catalyst, sorbitol serves asa raw material, and the isosorbide is prepared by dehydration reaction under heating conditions. Sorbitol conversion rate is 100%, and isosorbide yield can reach 83%. The method is simple in production process and less in environmental pollution, the catalyst is good in effect, easy to separate and reusable, and the method has an industrial application prospect.

Description

Technical field [0001] The invention belongs to the technical field of fine chemicals, and specifically relates to a method for preparing isosorbide from sorbitol. Background technique [0002] Isosorbide is widely used in food, medicine and polymer plastics. Isosorbide is usually given as a liquid acid (such as H 2 SO 4 Etc.) are catalysts prepared by dehydration of sorbitol, but in the production process, strong liquid acid catalysts not only corrode equipment, pollute the environment, and are difficult to separate from the product, but also have disadvantages such as many side reactions and deep color of the resulting product. Patent US6407266 discloses a production method of isosorbide, which uses concentrated sulfuric acid as a catalyst and 70% sorbitol solution as raw material. The concentration of isosorbide in the resulting product is only about 75%, and the subsequent need to remove water solvents and other complicated Separation step. [0003] The solid acid catalyst is...

Claims

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Application Information

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IPC IPC(8): C07D493/04B01J31/02
Inventor 陈彤张怡张华王公应
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI