Method for preparing polyatomic alcohol from crop straw

A technology for crop straw and polyol, which is applied in hydrolysis preparation, organic chemistry and other directions, can solve the problems of complex production process and product separation process, low utilization efficiency of plant fibers, etc., and achieves convenient purchase, simple reaction conditions and simple production process. Effect

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 hydrolyzed products of plant fibers such as corn, wheat, and soybean husks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] First, add 100g of ethylene glycol and 3g 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 of corn stalks under stirring, and react at a constant temperature for 150 minutes The three-neck flask was placed in the ice-water mixture to cool to terminate the reaction, and the polyol containing 16.3% corn stalk degradation products was obtained, the viscosity was 750-1200mPa·S, and the hydroxyl value was 570-800mg KOH / g.

Embodiment 2

[0023] 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 150°C; then add 20g of straw under stirring After 120 minutes of constant temperature reaction, the three-necked flask was placed in ice-water mixture to cool to terminate the reaction, and a polyol containing 16.3% straw degradation products was obtained, with a viscosity of 950-1480mPa·S and a hydroxyl value of 280-450mg KOH / g.

Embodiment 3

[0025] First, add 100g of polyethylene glycol and 3g of sulfuric acid into a three-necked flask equipped with a mechanical stirrer and a condenser, stir to mix evenly, and preheat the oil bath to 150°C; then add 30g of corn stalks under stirring, and react at a constant temperature for 150min Afterwards, the three-neck flask was placed in ice-water mixture to cool to terminate the reaction, and a polyol containing 22.6% corn stalk degradation products was obtained, the viscosity was 1150-1730 mPa·S, and the hydroxyl value was 225-390 mg KOH / g.

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Abstract

The invention relates to a method of preparing polyhydric alcohol by using crops straws, comprising the steps: counting by mass portion, 100 portions of organic solvent and 1 to 6 portions of catalyst are evenly mixed, then 15 to 40 portions of crops straws are added under 80 to 210 DEG C, and the polyhydric alcohol can be obtained by reacting for 60 to 240min. The method fully utilizes rich and reproducible agricultural residue; the hydroxyl value of the obtained polyhydric alcohol is 180 to 850mg KOH/g; crops straw catabolites of different contents and polyhydric alcohol of different hydroxyl values can be obtained by adjusting the production process and the portions according to requirements. The production process of the invention is simple and the invention can be directly used for synthesizing polyurethane foam plastics without the need of post-processing procedures of vacuum dehydration, product separation, etc.

Description

technical field [0001] The invention relates to a method for preparing polyols, in particular to a method for preparing polyols by utilizing crop stalks. Background technique [0002] Polyurethane foam has excellent thermal insulation properties, good processability and mechanical properties, and is widely used in various fields of national economy and national defense industry. Traditional polyurethane foams are mainly synthesized by the reaction of polymer polyols and organic isocyanates, and these raw materials are all derived from petrochemical products. With the rapid development of social economy, the petroleum resources on which human beings depend are increasingly thirsty. In order to reduce the dependence on petroleum resources and the environmental problems caused by petrochemical industry, polyols are prepared with abundant and renewable natural resources instead of petroleum resources. Compounds have drawn attention. [0003] The publication number is "CN 18691...

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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