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

Method for preparing bagasse dissolving pulp and pre-extracting hemicellulose and product thereof

A technology of hemicellulose and dissolving pulp, which is applied in pulping with inorganic alkali, fiber raw material treatment, chemical instruments and methods, etc., can solve the problem of comprehensive utilization of bagasse, and achieve considerable economic benefits, high extraction rate, comprehensive production The effect of cost reduction

Inactive Publication Date: 2012-10-03
上海士林纤维材料有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no complete technical plan for the comprehensive utilization of bagasse that fully considers the extraction of xylan and the preparation of dissolving pulp

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 bagasse dissolving pulp and pre-extracting hemicellulose and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of bagasse dissolving pulp pulping method of pre-extracting hemicellulose, comprises the following steps:

[0042] (1) Bagasse material preparation: adopt the bagasse that removes most of the colloids through natural storage and fermentation, and carry out wet pitting and washing to the bagasse, and the pitting rate of bagasse is greater than 35%;

[0043] (2) Pre-hydrolysis: carried out in a steaming ball, the process conditions are: to remove the pith and dry bagasse, the solid-liquid ratio is 1:3, the hydrolysis temperature is 150 ° C, the pressure is the saturated steam pressure at the corresponding temperature, and the hydrolysis time is 220 minutes, using steam heating, the pH value of the end point of hydrolysis is 3~4;

[0044] (3) Liquid-solid separation and washing, collecting filtrate to obtain extract: use three-stage screw press to carry out liquid-solid separation and countercurrent washing on the hydrolyzate, the first stage is directly pressed or ...

Embodiment 2

[0061] A kind of bagasse dissolving pulp pulping method of pre-extracting hemicellulose, comprises the following steps:

[0062] (1) bagasse is prepared: with embodiment 1;

[0063] (2) Pre-hydrolysis: carried out in a steaming ball, the process conditions are: for the pulp-removed and dried bagasse, the solid-liquid ratio is 1:3, the temperature is 170°C, the pressure is the saturated steam pressure at the corresponding temperature, and the hydrolysis time is 110°C. Minutes, using steam heating, the pH value of the end point of hydrolysis is 3~4;

[0064] (3) Liquid-solid separation and washing, collecting the filtrate to obtain the extract: same as in Example 1;

[0065] (4) Preparation of dissolving pulp by residual alkali method: same as in Example 1.

Embodiment 3

[0067] A kind of bagasse dissolving pulp pulping method of pre-extracting hemicellulose, comprises the following steps:

[0068] (1) bagasse is prepared: with embodiment 1;

[0069] (2) Pre-hydrolysis: carried out in a steaming ball, the process conditions are: for depitting and dry bagasse, the solid-liquid ratio is 1:6, the temperature is 150°C, the pressure is the saturated steam pressure at the corresponding temperature, and the hydrolysis time is 240°C. Minutes, using steam heating, the pH value of the end point of hydrolysis is 3~4;

[0070] (3) Liquid-solid separation and washing, collecting the filtrate to obtain the extract: same as in Example 1;

[0071] (4) Preparation of dissolving pulp by residue alkali method: comprising the following steps:

[0072] A, cooking: carry out in the steaming ball, the process conditions are: the amount of alkali used is 10-15% (to the initial depitting and absolutely dry bagasse, Na0H), the degree of sulfidation is 15-20%, and the ...

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
whitenessaaaaaaaaaa
whitenessaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing bagasse dissolving pulp and pre-extracting hemicelluloses. The method comprises the following steps: bagasse preparation, wherein bagasse is subjected to depithing and washing; prehydrolysis carried out in a globe digester or a hydrolysis boiler with the process conditions during the process for depithing and oven-drying bagasse as follows: 1:0.4-8.0 adopted as the solid-to-liquid ratio, 100-200 DEG C adopted as the hydrolysis temperature, 15-240 minutes adopted as the hydrolysis time, 2-5 adopted as the pH value of the end point of hydrolysis so as to control the hydrolysis process and obtain the hydrolysate with xylo-oligosaccharide as the main component thereof and a small amount of xylose; solid-to-liquid separation and washing, wherein the filtrate is collected to prepare an extracting solution; dissolving pulp prepared by residue alkali method. By adopting the method, bagasse dissolving pulp and bagasse extracting solution which is used to prepare oligosaccharides are obtained. Most of pentosan in bagasse can be extracted by controlling the process conditions of the prehydrolysis. The technical route and the process conditions have strong pertinence, so that the reactivity and the uniformity of bagasse dissolving pulp can be improved. By improving the traditional dissolving pulp alkali method for pulping, bagasse biorefinery based on dissolving pulp pulping can be realized in engineering, so that the production costs for preparing bagasse dissolving pulp and pre-extracting hemicellulose are reduced.

Description

technical field [0001] The invention relates to the fields of chemical engineering, hydrolysis technology and dissolving pulp manufacturing technology, in particular to a bagasse dissolving pulp pulping method for pre-extracting hemicellulose and its products. Background technique [0002] Lignocellulosic raw materials are mainly used in pulp and dissolving pulp, the latter including viscose fiber pulp, cellulose acetate dissolving pulp, nitrocellulose dissolving pulp and cellulose ether dissolving pulp. Among them, viscose fiber pulp, the most important variety, has formed an industrial system with cotton linters and wood as the main raw materials after nearly a hundred years of development. In recent years, with the rapid expansion of market demand and fiber production capacity, domestic viscose fiber pulp consumption has increased significantly, and a large amount of wood pulp has to be imported every year, and the bottleneck of raw materials is prominent; at the same tim...

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): D21C3/02D21C1/04D21B1/04D21C1/00D21C7/00D21H11/12D21H11/02C08B37/14C07H3/02C07H3/06C07H7/033C07H1/00C07G1/00C07C53/08C07C31/08C07C31/18
Inventor 吴学东陈惠敏王永东
Owner 上海士林纤维材料有限公司
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