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Method for preparing corn straw polyatomic alcohol

A corn stover and polyol technology, which is applied in the field of comprehensive utilization of plant biomass, can solve the problems of complex production process and product separation process, low utilization rate of plant fiber, etc., and achieves the effects of reducing production cost, increasing content and alleviating dependence.

Inactive Publication Date: 2008-05-28
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is mainly to obtain a single polyol through a series of reactions and separations of the hydrolyzate of plant fibers such as corn, wheat, and soybean husks, but the utilization rate of plant fibers is low, and the entire reaction system is an aqueous solution. Complex separation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 80g of polyethylene glycol, 20g of glycerol and 3g of sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, and stir to make them evenly mixed. Preheat the oil bath to 150°C; then add 20 g of corn stalks under stirring, and add 10 g of corn stalks after 30 minutes of constant temperature reaction, and continue the reaction for 120 minutes. The polyol of the degradation product of corn stalks has a viscosity of 900-1680 mPa·S and a hydroxyl value of 245-410 mg KOH / g.

Embodiment 2

[0025] First, add 80g of polyethylene glycol, 20g of glycerol and 3g of sulfuric acid into a three-necked flask equipped with mechanical stirring and a condenser, stir to make it evenly mixed, and preheat the oil bath to 160°C; then add 20g of corn under stirring Straw, after constant temperature reaction for 30 minutes, add 20 g of corn stalks, continue the reaction for 120 minutes, then place the three-necked flask in ice-water mixture to cool to terminate the reaction, and obtain a polyol containing 28.0% corn stalk degradation products with a viscosity of 1350-1920 mPa·S , the hydroxyl value is 220-385 mg KOH / g.

Embodiment 3

[0027] First, add 80g of polyethylene glycol, 20g of glycerol and 4.5g of sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, stir to make it evenly mixed, and preheat the oil bath to 160°C; then add 20g under stirring For corn stalks, add 20g of corn stalks after 30 minutes of constant temperature reaction, then add 10g of corn stalks after continuing the reaction for 30 minutes, and then place the three-neck flask in ice-water mixture to cool to terminate the reaction, and obtain a degradation product containing 32.4% corn stalks The polyol has a viscosity of 1580-2200mPa·S and a hydroxyl value of 190-360mg KOH / g.

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Abstract

The invention relates to a preparation method of maize straw polyhydric alcohol, which comprises the steps: (1) materials of the following mass portions are taken: 100 portions of organic solvent, 30 to 120 portions of maize straw and 1 to 8 portions of catalyst; the organic solvent and the catalyst are mixed evenly; (2) the mixed liquid is kept at the temperature of 90 to 200 DEG C; the maize straw is added by a plurality of steps and reacts for 60 to 180min after the addition and the maize straw polyhydric alcohol is obtained after cooling. The method of the invention can increase the content of maize straw catabolite in polyhydric alcohol products, fully utilizing wasted maize straw. The content of the maize straw catabolite in the polyhydric alcohol is 20 to 65 percent with 150 to 780 mg KOH / g hydroxyl value. Maize straw catabolites of different contents and polyhydric alcohol of different performance indexes can be obtained by adjusting the production process and the portions of the raw materials. The obtained maize straw polyhydric alcohol can be directly used for synthesizing polyurethane foam plastics.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of plant biomass, and in particular relates to a preparation method of corn stalk polyol. Background technique [0002] Plant biomass refers to the general term for a large organic matter synthesized by photosynthesis. With the depletion of fossil energy, plant biomass, as an extremely abundant renewable resource in nature, has attracted increasing interest in its recycling. However, biomass is mainly composed of cellulose, hemicellulose and lignin, which is insoluble and insoluble, making it difficult to reprocess and reuse. Because the molecular chain of plant biomass contains a large number of hydroxyl groups, it can replace petrochemical polyol compounds as raw materials for the synthesis of polyurethane and reduce dependence on petroleum resources. However, due to its crystalline structure and three-dimensional space network structure, the molecular chain The hydroxyl groups lose th...

Claims

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Application Information

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IPC IPC(8): C07C31/18C07C29/09
Inventor 廖兵颜永斌庞浩张容丽杨小旭董翔
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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