Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing cellulose acetate from wheat straws

A technology of cellulose acetate and wheat straw, applied in the direction of chemical recycling, etc., to achieve the effect of reducing the average degree of polymerization, large interplanar spacing, and improving whiteness

Inactive Publication Date: 2014-04-30
GUANGDONG SHANGJIU BIODEGRADABLE PLASTICS
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method adopts a simple and effective pretreatment method of wheat straw, and at the same time, in order to overcome the deficiency of a single catalyst in the traditional acetylation process, the acetylation reaction is carried out under a new catalyst system, thereby preparing cellulose acetate with high added value

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: 34g of pretreated wheat straw powder is placed in a reactor, and 150ml of esterification solution is added; 0.5% of mass sodium bisulfate, 1% of volume of hydrofluoric acid and 2% of volume of concentrated sulfuric acid are added as catalysts, Dilute with distilled water 1:1 before adding the concentrated sulfuric acid; Stir the reaction at 60°C for 2 hours to obtain a dark brown solution; Connect the outlet of the reactor to the condenser, continue heating and reflux for 0.5 hours, and collect Glacial acetic acid. The collection was stopped after the reactor was naturally cooled to room temperature.

[0025]The supernatant of the solution in the reactor was separated, and the precipitate was discarded. Distilled water was added to the supernatant to precipitate a precipitate, washed with water several times to neutrality, filtered by suction and dried in vacuum to finally obtain the acetylated product.

[0026] Solvent extraction of acetylated products ...

Embodiment 2

[0033] Embodiment 2: 34g of the pretreated wheat straw powder is placed in a reactor, and 150ml of esterification solution is added; 2% of mass sodium bisulfate, 2% of volume of hydrofluoric acid and 0.3% of volume of concentrated sulfuric acid are added as catalysts, Dilute with distilled water 1:1 before adding the concentrated sulfuric acid; Stir the reaction at 70°C for 2 hours to obtain a dark brown solution; Connect the outlet of the reactor to the condenser, continue heating and reflux for 0.5 hours, and collect Glacial acetic acid. The collection was stopped after the reactor was naturally cooled to room temperature.

[0034] The supernatant of the solution in the reactor was separated, and the precipitate was discarded. Distilled water was added to the supernatant to precipitate a precipitate, washed with water several times to neutrality, filtered by suction and dried in vacuum to finally obtain the acetylated product.

[0035] Solvent extraction of acetylated prod...

Embodiment 3

[0042] Embodiment 3: 34g of the pretreated wheat straw powder is placed in a reactor, and 150ml of esterification solution is added; 3% of mass sodium bisulfate, 3% of volume of hydrofluoric acid and 0.5% of volume of concentrated sulfuric acid are added as catalysts, Dilute with distilled water 1:1 before adding the concentrated sulfuric acid; Stir the reaction at 80°C for 2 hours to obtain a dark brown solution; Connect the outlet of the reactor to the condenser, continue heating and reflux for 0.5 hours, and collect Glacial acetic acid. The collection was stopped after the reactor was naturally cooled to room temperature.

[0043] The supernatant of the solution in the reactor was separated, and the precipitate was discarded. Distilled water was added to the supernatant to precipitate a precipitate, washed with water several times to neutrality, filtered by suction and dried in vacuum to finally obtain the acetylated product.

[0044] Solvent extraction of acetylated prod...

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 sizeaaaaaaaaaa
degree of substitutionaaaaaaaaaa
degree of substitutionaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing cellulose acetate from wheat straws. The method comprises the following steps of: performing activating and bleaching pretreatment on the wheat straws; mechanically crushing; performing acetylation reaction; recovering the esterified liquid in a low-temperature condensation mode; separating acetylized products; and extracting the acetylized products with different components by using solvents to separate out the products such as cellulose triacetate, cellulose diacetate, acetylized hemicellulose, acetylized lignin and the like. The invention provides an economic and effective method for pretreating the wheat straws. By the method, the defect of the single catalyst in the traditional acetylation process is overcome; the cellulose acetate with high substitution degree and polymerization degree is prepared in a new catalyst system; and the wheat straws are utilized reasonably.

Description

technical field [0001] The invention relates to the technical field of utilization of wheat straw renewable resources, in particular to a method for preparing cellulose acetate from wheat straw under the action of an improved catalyst system. Background technique [0002] Natural cellulose raw material is the most abundant renewable organic matter on earth. China can produce about 1.145 billion tons of natural cellulose raw materials through photosynthesis every year, and the crop straw and hulls alone account for more than 700 million tons, of which wheat straw accounts for about 21%. In China, most straws are used as fuel or directly burned in the fields, which not only destroys the ecological balance, depletes soil fertility, causes a vicious cycle in agriculture, but also pollutes the environment and poses fire hazards. [0003] With the emphasis on environmental protection and the utilization of renewable resources, the utilization of crop straw resources including whe...

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 Patents(China)
IPC IPC(8): C08B3/06C08B3/02C08B3/28C08B37/14C08H7/00
CPCY02P20/584
Inventor 祝光富黄少斌吴文清张瑞峰孙立波彭贤宾
Owner GUANGDONG SHANGJIU BIODEGRADABLE PLASTICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com