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Continuous preparation method of polymer-grade carbohydrate diol

A technique for polymerizing sugars, applied in organic chemistry, etc., can solve the problems of no continuous production technology and method for polymerizing sugar diols, limited application, high price, etc., achieve good application effects, realize industrialization and The effect of large-scale industrial production and high degree of automation

Pending Publication Date: 2022-06-28
河南正通食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are many studies on the preparation technology of sugar diols, most of them stay at the laboratory level
Only a small amount of products are used in the medical field, and its high price limits its application in the field of plastics
[0005] At present, there is no relevant report on the production technology and method of continuous preparation of polymer grade sugar diol in China

Method used

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  • Continuous preparation method of polymer-grade carbohydrate diol
  • Continuous preparation method of polymer-grade carbohydrate diol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The 70% glucitol is heated to about 80°C through a heat exchanger and continuously enters the rising film evaporation device, removes free moisture at 3000Pa, and then continuously enters the film reactor and continuously adds catalyst phosphoric acid to raise the temperature to 140°C , 1,4-anhydro-D-glucitol and by-product mixture were prepared by circulating at 100-150Pa for two hours, and then continuously entered into the next film reactor device, heated to 185℃, circulated under vacuum 100Pa and collected its light fraction , when the light fraction is no longer distilled, the heavy phase by-product is released, and the light fraction continuously passes through the flash device to remove free water under the vacuum of 1000pa, and then enters the thin film distillation device continuously. The light fraction distilled at a temperature of 180° C. and a vacuum of 100 Pa is 1,4; 3,6-anhydro-D-glucitol, and its content is greater than 98%. Then, it is obtained by cooli...

Embodiment 2

[0030] The 70% glucitol is heated to about 80 ℃ through a heat exchanger and continuously enters the rising film evaporation device, removes free moisture at 3000Pa, and then continuously enters the thin film reactor and continuously adds catalyst sulfuric acid to make the temperature rise to 140 ℃ , 1,4-anhydro-D-glucitol and by-product mixture were prepared by circulating at 100-150Pa for two hours, and then continuously entered into the next film reactor device, heated to 185℃, circulated under vacuum 100Pa and collected its light fraction , when the light fraction is no longer distilled, the heavy phase by-product is released, and the light fraction continuously passes through the flash device to remove free water under the vacuum of 1000pa, and then enters the thin film distillation device continuously. The light fraction distilled at a temperature of 180° C. and a vacuum of 100 Pa is 1,4; 3,6-anhydro-D-glucitol, and its content is greater than 98%. Then, it is obtained b...

Embodiment 3

[0032] The 70% glucitol is heated to about 80 ℃ through a heat exchanger and continuously enters the rising film evaporation device, removes free moisture at 3000Pa, and then continuously enters the film reactor and continuously adds catalyst heteropoly acid to make its temperature rise to 1000Pa. 1,4-anhydro-D-glucitol and by-product mixture were prepared by circulating at 100-150Pa for two hours at 140°C, then continuously entered into the next film reactor device, heated to 185°C, circulated under vacuum 100Pa and collected. Light fraction, when the light fraction is no longer distilled, the heavy phase by-products are released, and the light fraction continuously passes through the flash device to remove free water under vacuum of 1000pa, and then enters the thin film distillation device continuously. The light fraction distilled at a temperature of 180° C. and a vacuum of 100 Pa is 1,4; 3,6-anhydro-D-glucitol, and its content is greater than 98%. Then, it is obtained by c...

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Abstract

The invention belongs to the technical field of bio-based chemicals, and discloses a continuous preparation method of polymer-grade carbohydrate diol. The preparation method comprises the following steps: under the action of a catalyst, carrying out free water removal, intramolecular primary dehydration, intramolecular secondary dehydration, drying dehydration, distillation refining and granulation / packaging on the glucitol through six continuous processes by utilizing a thin film distillation device, a thin film reaction device and a flash evaporation device, and finally preparing the saccharide diol with the purity of more than 98% and meeting the polymer grade requirement. The operation process for continuously preparing the carbohydrate diol is simple and convenient, the automation degree is high, and industrialization and large-scale industrial production can be effectively achieved. The product disclosed by the invention is applied to copolymerization modification materials and bio-based plasticizers of polyterephthalic acid, adipic acid and butanediol (PBIAT), and a good effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of bio-based chemicals, in particular to a continuous preparation method of a bio-based polymer material polymer-grade saccharide diol. Background technique [0002] In the country, promoting the "plastic ban", replacing non-degradable plastics with biodegradable plastics, and eliminating "white pollution", new bio-based materials will replace petroleum-based materials. Bio-based sugar diols are one of the important polymer materials to replace petroleum-based diols. [0003] Bio-based sugar diols have rigid molecular structure and chiral chemical structure, and are copolymerized modified materials to replace petroleum-based 1,4-butanediol and bisphenol A in thermoplastics (polyester, polycarbonate, polyurethane). Can improve and improve its mechanical properties, glass transition temperature and transparency. [0004] Although there are many studies on the preparation technology of sugar diols, most of th...

Claims

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Application Information

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IPC IPC(8): C07D493/04
CPCC07D493/04
Inventor 楚喆楚军政李兴伟
Owner 河南正通食品科技有限公司
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