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

A method and system for preparing pulp using grass straw as raw material

A technology of grasses and straws, which is applied in the field of pulp preparation, can solve the problems of impossible extraction of lignin and five-carbon sugar, reduction of pulp whiteness, and increase of pulping cost, so as to reduce pollutant discharge, low processing temperature, The effect of ensuring whiteness

Active Publication Date: 2020-08-04
大连德方元农业科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, under the action of high temperature and high pressure, the hemicellulose and lignin outside the straw fiber are stripped by high-concentration alkali to obtain pulp. However, the strong alkali will also damage part of the cellulose during the action, thereby reducing the pulp yield. At the same time, due to the action of strong alkali, lignin, hemicellulose, etc. are decomposed into small molecular substances to form black liquor, which can easily dye cellulose black and reduce the whiteness of pulp. Additional steps such as delignification, thereby increasing pulping costs
In addition, due to high-temperature and high-alkali cooking, the five-carbon sugars derived from lignin and hemicellulose dissolve into black liquor that is not easy to separate, which not only causes environmental pollution, but also makes the extraction of lignin and five-carbon sugars impossible.

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
  • A method and system for preparing pulp using grass straw as raw material
  • A method and system for preparing pulp using grass straw as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Pretreatment

[0045] Cutting the rice straws bundled into a round or square shape (i.e. pulping raw materials with a moisture content of 10-14%) so that the length of more than 80% of the cut rice straws is less than 25 mm; subsequently, removing the rice straws Sand, dust, leaves with low cellulose content, ears and other impurities in the rice straw to obtain pretreated rice straw.

[0046] 2. The first enzymatic treatment

[0047] Mix the pretreated rice straw and water according to the mass ratio of 1:6, adjust the pH value of the mixture to about 6, and raise the temperature to about 40°C, keep it warm, and then add laccase with an enzyme activity of 10000U / g for the second step. 1. Enzyme hydrolysis treatment, wherein the dosage of laccase is 0.1% (that is, 0.1kg laccase is used for 100kg of pretreated rice straw and water mixture); after about 2 hours of the first enzymolysis treatment, the first enzymolysis treatment product is obtained.

[0048] The ligni...

Embodiment 2

[0059] 1. Pretreatment

[0060] Cut the wheat straw (moisture content 12%), so that the length of more than 80% of the wheat straw after cutting is less than 25mm; then, remove impurities such as sand, dust, and leaves with low cellulose content in the wheat straw , to obtain pretreated wheat straw.

[0061] 2. The first enzymatic treatment

[0062] Mix the pretreated wheat straw and water according to the mass ratio of 1:6, adjust the pH value of the mixture to about 5, and raise the temperature to about 50°C, keep it warm, and then add laccase with an enzyme activity of 10000U / g for the second step. 1. Enzymatic hydrolysis treatment, wherein the dosage of laccase is 0.05%; about 2 hours after the first enzymatic hydrolysis treatment, the product of the first enzymatic hydrolysis treatment is obtained; after the first enzymolysis treatment, the dissolution rate of lignin is 73%, The dissolution rate of pentosan was 40%.

[0063] 3. Cooking treatment

[0064] Add sodium hy...

Embodiment 3

[0071] 1. Pretreatment

[0072] Cut the straw straw (moisture content is about 12%), so that the length of more than 80% of the straw straw after cutting is less than 25mm; then, remove sand, dust, and leaves with low cellulose content in the straw straw and other impurities to obtain pretreated rice straw.

[0073] 2. The first enzymatic treatment

[0074] Mix the pretreated rice straw and water according to the mass ratio of 1:8, adjust the pH value of the mixture to about 7, and raise the temperature to about 60°C, keep it warm, and then add laccase with an enzyme activity of 10000U / g for the second step. 1. Enzymolysis treatment, wherein the amount of laccase is 0.2%; after about 1 hour of the first enzymolysis treatment, the product of the first enzymolysis treatment is obtained; after the first enzymolysis treatment, the dissolution rate of lignin is 58%, The dissolution rate of pentosan was 40%.

[0075] 3. Cooking treatment

[0076] Add sodium hydroxide solution to...

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
lengthaaaaaaaaaa
whitenessaaaaaaaaaa
Login to View More

Abstract

The invention provides a method and system for preparing pulp with grass straw as raw materials.The method of the present invention includes the following steps: 1) Add water to the raw material to the raw material, and use lignin degradase for the first enzymatic dismissal; 2) the first enzymatic dismissal treatment at 80‑130 ° CThe product is cooked; 3) The second enzymatic dismissal is performed by semi -cellulose enzymes.The method of the present invention can increase the slurry rate, reduce pollutant emissions in the dark fluid, reduce alkali and energy consumption, and is conducive to the extraction of lignin and five carbon sugar, and the quality of the slurry is high.

Description

technical field [0001] The invention relates to a pulping process, in particular to a method and system for preparing pulp with grass straw as raw material. Background technique [0002] Paper is an indispensable part of human life. Pulp is mainly produced from forest wood and crop residues. Since the growth rate of forest trees cannot meet the growth of human demand for paper products, the use of renewable crop straws to produce pulp has become an effective way to reduce tree felling and protect the environment. [0003] The existing method of producing pulp from crop straws is mainly the alkaline cooking method, and its production process follows the steps of "cooking-refining-washing-screening"; specifically, the method usually uses alkali with a mass content of 14-18%. The crop stalks are cooked under high-pressure steam at 160-180°C for 45min-1.5h to obtain pulp. In the above method, under the action of high temperature and high pressure, the hemicellulose and lignin...

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): D21C5/00D21H11/12
CPCD21C5/005D21H11/12C12Y302/01008C12Y302/01078D21C7/00C12P19/02C12P19/14C12P2201/00
Inventor 刘忠玉孙华
Owner 大连德方元农业科技有限公司
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