Method for preparing plant-based polyether polyol by straw liquefaction

A technology based on polyether and polyol, which is applied in the field of straw liquefaction to prepare plant-based polyether polyol, which can solve the problems of complex liquefaction products, slow liquefaction speed, unfavorable utilization, etc., to improve liquefaction efficiency, increase contact area, and benefit The effect of the osmotic reaction

Inactive Publication Date: 2012-08-15
李翠花
View PDF2 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the cell wall structure of plant straw is very tight, and it is difficult for liquefaction reagents to enter, resulting in a relatively slow liquefaction speed and insufficient liquefaction effect
Secondly, the composition of lignocellulosic raw materials is complex, and the reaction behavior of components such as cellulose, hemicellulose and lignin is quite different from that of liquefaction reagents. To obtain the reaction conditions that can effectively degrade and dissolve the three main components, It is difficult; moreover, the liquefied products are more complicated, and the relative molecular weight and the content of reactive functional groups of the liquefied products cannot be effectively controlled by liquefying unseparated plant fiber raw materials.
In addition, as a low-molecular compound, hemicellulose in plant fiber raw materials is easily oxidized during liquefaction to form carboxylic acid, which makes the composition of the target product complex and is not conducive to subsequent utilization.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing plant-based polyether polyol by straw liquefaction
  • Method for preparing plant-based polyether polyol by straw liquefaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Crush the corn stalks to 2-3cm first, then remove the stone and sand, dry the moisture of the stalks at a temperature of 80-100 ℃ to below 5%, and finally crush the dried corn stalks to the particle size for the second time with a grinder Spare below 0.3mm. Add 0.5% dilute sulfuric acid to the crushed straw and hydrolyze it at 120°C to 130°C for 1 hour. The ratio of the volume of dilute sulfuric acid used (ml) to the mass of straw (g) is 50:1; after the reaction, filter the obtained solid After the material is dried, it is the straw residue of acid hydrolysis. The quality of the straw residue is 90% of the original straw, and the measured hemicellulose content in the straw residue is 10%.

[0021] Weigh 150g of polyethylene glycol 400 and 150g of glycerin into a three-necked flask, and raise the temperature to 120°C, then add 200g of straw residue and 3g of sulfuric acid, start the magnetic stirring paddle to mix the materials, and continue to heat up to 155°C, and kee...

Embodiment 2

[0023] The pretreatment steps of stalks in the present embodiment are basically the same as in Example 1, the difference being that corn stalks are hydrolyzed with 2% dilute sulfuric acid at 125° C. for 1.25 h, the volume of dilute sulfuric acid used (ml) and the quality of corn stalks ( g) The ratio is 30:1. The mass of the corn stalk residue is 85% of the original stalk, and the measured hemicellulose content in the corn stalk residue is 8% (see Table 1).

[0024] The liquefaction steps of stalks in this example are basically the same as in Example 1, except that the mass ratio of corn stalk residue to liquefaction agent is 1:2, the mass ratio of catalyst to liquefaction agent is 1:150; the liquefaction temperature is 165 ℃, liquefaction time 1.25h. The mass of the straw liquefaction product was measured to account for 85% of the amount of material added (see Table 2 for details).

Embodiment 3

[0026] The pretreatment steps of stalks in the present embodiment are basically the same as in Example 1, the difference being that corn stalks are hydrolyzed with 3% dilute sulfuric acid at 130° C. for 1.5 h, the dilute sulfuric acid volume (ml) used and the corn stalks quality ( g) The ratio is 10:1. The mass of the corn stalk residue is 70% of the original stalk, and the measured hemicellulose content in the corn stalk residue is 7% (see Table 1 for details).

[0027] The liquefaction steps of stalks in this example are basically the same as in Example 1, except that the mass ratio of corn stalk residue to liquefaction agent is 1:2.5, the mass ratio of catalyst to liquefaction agent is 1:200; the liquefaction temperature is 170 ℃, liquefaction time 1.5h. The mass of straw liquefaction products accounted for 95% of the amount of material added (see Table 2).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
viscosityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing plant-based polyether polyol by straw liquefaction. The method comprises the following steps: adding a liquefacient and a catalyst into acid-hydrolytic straw residues, reacting at 155 DEG C-170 DEG C for 1 h-1.5 h, wherein the mass ratio of the straw residue and the liquefacient is 1:1.5-1:2.5; after the reaction, adjusting the pH of the liquefied product to 6-7, filtering to remove residues in the liquefied product so as to obtain liquid which is the plant-based polyether polyol. According to the invention, straws are subject to acid treatment, which increases the accessibility of the liquefacient, cellulose and lignin, removes hemicellulose in the straws, facilitates the condition control of the liquefaction reaction, and improves the liquefaction efficiency and the quality of the liquefaction product.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of biomass, in particular to a method for preparing plant-based polyether polyols by liquefying straws. Background technique [0002] The liquefaction of waste biomass into chemical raw materials to replace petroleum products can reduce the pollution of waste to the environment, reduce human consumption and dependence on petrochemical resources, and at the same time enable a large number of waste biomass resources to be value-added transformation. The main chemical components of straw are cellulose, hemicellulose and lignin, which account for more than 90% of the straw mass. Although the composition of straw is much more complex than that of petroleum and other fossil resources, it is also a hydrocarbon containing a large number of hydroxyl groups, which can be converted into usable chemical raw materials by liquefaction and used to synthesize various polymer materials. After treating lig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/00C08H7/00
Inventor 陈洪章王岚于彬
Owner 李翠花
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap