Method for preparing polyurethane from straw fermentation residua through polyatomic alcohol liquefaction

A residue and polyurethane technology, which is applied in the field of polyol liquefaction of straw fermentation residues to prepare polyurethane, can solve the problems of unstable performance of polyurethane products, complex components, and ineffective use of liquefied residues, etc., to improve accessibility, lignin The effect of high content and lower reaction temperature

Inactive Publication Date: 2012-01-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology uses waste products like rice or wheat grains that are left over after traditional methods such as burning them down at home. By utilizing this process instead of purchasing new ones it saves money on disposal costs while also producing more valuable chemicals than what was previously needed.

Problems solved by technology

This patent describes methods for efficiently converting vegetative matter called lignosulfonated sugars into useful chemical substances like aliquithiurandiamides (LCA). Lignopolymers containing carboxypolyimine groups provide stable covalently bonding sites within their backbone moieties while maintaining excellent mechanical strength and durability characteristics when applied externively onto substrates. These technical problem addressed during research includes finding ways to convert lignophenoxanes into valuable ones without causing decomposition issues associated with other types of starting ingredients, developing efficient processes for manufacturing highly pure forms of polyester resins, providing usages where biological based polyesters could substitute traditional fossile pigments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The straw fermentation residue is from the fermentation residue of solid-state fermentation of ethanol by enzymatic hydrolysis of straw, in which the lignin content is 43%, the cellulose content is 16%, the hemicellulose content is 3%, and the water content is less than 3%.

[0025] Add 50g of straw fermentation residue, 150ml of polyethylene glycol 400, 50ml of glycerin, and 2ml of concentrated sulfuric acid into the three-neck flask, mix well, and place in a water bath at 140°C for 60 minutes to react. The reaction was carried out in an oil bath heating system equipped with continuous stirring and condensing reflux. Stirring speed 300rpm. After the reaction is finished, a liquefied mixture of straw fermentation residue is obtained. The hydroxyl value of the liquefied mixture was measured to be 187 mg potassium hydroxide / g, and the viscosity was 1440 mPa·s.

[0026] Take by weighing 10g of liquefied mixture, add 0.625g reaction auxiliary (including 0.4g water, 0.0125...

Embodiment 2

[0028] The straw fermentation residue is from the fermentation residue of straw enzymatic hydrolysis solid-state fermentation ethanol, and the lignin content is 43%, the cellulose content is 16%, the hemicellulose content is 3%, and the water content is less than 3%.

[0029] Add 50 g of straw fermentation residue, 150 ml of polyethylene glycol 400, 50 ml of glycerin, and 2 ml of concentrated sulfuric acid into the three-necked flask, mix them evenly, and place them in a water bath at 140° C. for 45 minutes to react. The reaction was carried out in an oil bath heating system equipped with continuous stirring and condensing reflux. Stirring speed 300rpm. After the reaction is finished, a liquefied mixture of straw fermentation residue is obtained. The liquefied mixture is centrifuged to remove the liquefied residue, and the obtained liquid is the liquefied product. The quality of the liquefied residue is 30% of the straw fermentation residue. The hydroxyl value of the liquef...

Embodiment 4

[0036] The straw fermentation residue is from the fermentation residue of straw enzymatic hydrolysis solid-state fermentation ethanol, and the lignin content is 43%, the cellulose content is 16%, the hemicellulose content is 3%, and the water content is less than 3%.

[0037] Add 50 g of straw fermentation residue, 400 ml of polyethylene glycol 400, 100 ml of glycerin, and 2 ml of concentrated sulfuric acid into a three-neck flask, mix well, and place in a 120° C. water bath for 90 minutes to react. The reaction was carried out in an oil bath heating system equipped with continuous stirring and condensing reflux. Stirring speed 300rpm. After the reaction is finished, a liquefied mixture of straw fermentation residue is obtained. The liquefied mixture is centrifuged to remove the liquefied residue, and the obtained liquid is the liquefied product. The measured hydroxyl value of the liquefied product was 141 mg potassium hydroxide / g, and the viscosity was 236 mPa·s.

[0038] ...

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Abstract

The invention discloses a method for preparing polyurethane from straw fermentation residua through polyatomic alcohol liquefaction. The method comprises the following steps of: 1) carrying out polyatomic alcohol liquefaction on the straw fermentation residua, thus a liquefied product is obtained; and 2) reacting the liquefied product with isocyanate, thus polyurethane is synthetized. The liquefied product of the straw fermentation residua obtained according to the invention can fully substitute petrified polyatomic alcohol to synthesize polyurethane, and has favorable glueability. According to the invention, not only is the fully substitution for petrified polyatomic alcohol by straw fermentation residua realized, but also a novel approach for the sources of raw materials of the polyurethane industry is provided, and simultaneously a novel approach for high-value conversion of straw fermentation residua is provided.

Description

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Claims

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Application Information

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Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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