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Method for preparing bio-based polyether polyols by solid acid catalyzed liquefaction of bamboo chips

A technology of polyether polyol and solid acid catalysis, applied in the field of bio-based polyether polyol, can solve the problems of large waste water discharge, equipment corrosion, and affecting the foaming process of polyurethane foam, and achieve less three wastes, easy operation, and economical The effect of value green environmental protection

Active Publication Date: 2022-03-25
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bamboo chips are mainly composed of hemicellulose, cellulose and lignin. Due to their polyhydric structure, they can be used as raw materials for the preparation of bio-based polyols. However, biomass such as bamboo chips at atmospheric pressure is usually solid, so acid catalysts are usually used It is liquefied under the polyol system, but the acid catalysts currently used are usually homogeneous acids such as sulfuric acid, hydrochloric acid, and phosphoric acid. The acid of bio-based polyether polyols will also affect the foaming process of the subsequent production of polyurethane foam, which brings many problems to large-scale industrial production, so it is necessary to do further research and improvement on this type of technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 5g of diatomite in an oven at 110°C to dry for 12h, then add it to 28.8g of phosphoric acid solution and mix evenly. The concentration of phosphoric acid in the phosphoric acid solution is 85% phosphoric acid, and put the uniform mixture into the muffle furnace , heated at 300°C for 48 hours. After the reaction, the solid phosphoric acid catalyst was ground with a mortar, and put into a desiccator for airtight storage for later use.

[0018] The above solid phosphoric acid is used as a catalyst to catalyze the liquefaction of bamboo chips to produce bio-based polyether polyols. The mass ratio of the added bamboo chips to polyol (mass ratio of polyethylene glycol 400 to glycerol is 3:1) is 1:8, and the amount of the catalyst is 30% of that of the bamboo chips. Use a magnetic stirrer to stir and react for 24 hours under normal pressure at 150°C. After the reaction, perform solid-liquid separation. Use a mixed solution of dioxane and water to wash the reaction and then...

Embodiment 2

[0020] In this example, 5 g of mesoporous silica was used instead of the above-mentioned diatomaceous earth, the preparation conditions and reaction conditions of the catalyst were the same as in Example 1, and the yield of the product bio-based polyether polyol was 65.3%.

Embodiment 3

[0022] In this example, 5 g of silica gel was used instead of diatomaceous earth in Example 1. The preparation conditions and reaction conditions of the catalyst were the same as in Example 1, and the yield of the product bio-based polyether polyol was 58.5%.

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PUM

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Abstract

The invention discloses a method for preparing bio-based polyether polyols through liquefaction of bamboo chips catalyzed by solid acid, which belongs to a method of bio-based polyether polyols. The method uses solid phosphoric acid as a catalyst for bamboo chips, React in a polyol system at high temperature, and then wash the reaction product with dioxane to obtain a mixture of bio-based polyether polyols and dioxane, and remove dioxane by rotary evaporation in a vacuum environment ring, so as to obtain bio-based polyether polyols; meanwhile, the method provided by the present invention uses solid phosphoric acid and polyols as catalysts and reaction media to prepare bio-based polyether polyols, which is easy to operate, and the reaction conditions are mild. The three wastes are less, and the treatment is convenient. It is a technology with economic value and green environmental protection, which is easy to promote.

Description

technical field [0001] The invention relates to a method for bio-based polyether polyols, more specifically, the invention mainly relates to a method for preparing bio-based polyether polyols by solid acid catalyzed liquefaction of bamboo chips. Background technique [0002] Most of the polyols in the production of polyurethane foams are developed from petrochemical resources as raw materials. However, with the depletion of petrochemical resources and in order to reduce the white pollution of polyurethane foams, it is particularly important to develop the production of degradable polyurethane foams. At present, the research direction of degradable polyurethane foam is mainly to use bio-based polyols to replace petroleum-based polyols. The main components of bamboo chips are hemicellulose, cellulose and lignin. Due to their polyhydric structure, they can be used as raw materials for the preparation of bio-based polyols. However, biomass such as bamboo chips at atmospheric pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/00C08G18/48
CPCC08G65/00C08G18/48
Inventor 吴斌唐宏伟杨凌吴珽田庆文冉淼
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY