Method for producing bamboo dissolving pulp by pre-extracting hemicellulose and product thereof

A technology of hemicellulose and dissolving pulp, applied in the directions of spinning solution preparation, pulping with inorganic alkali, fiber raw material treatment, etc. Improve the reaction performance and its uniformity, considerable economic benefits, and strong targeted effects

Inactive Publication Date: 2009-10-28
上海士林纤维材料有限公司
View PDF5 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Chinese Patent Publication No. CN101158122A relates to a kraft pulping method, which eliminates the pre-hydrolysis step and shortens the process on the surface, but the pentosan is not ut

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 producing bamboo dissolving pulp by pre-extracting hemicellulose and product thereof
  • Method for producing bamboo dissolving pulp by pre-extracting hemicellulose and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A kind of bamboo dissolving pulp pulping method of pre-extracting hemicellulose, comprises the steps:

[0052] (1) Bamboo material preparation: cut two to three-year-old bamboo into bamboo chips with a length of 15-30mm, a width of 10-20mm, and a thickness of 3-8mm through a slicer, screen through a high-frequency vibrating screen, and spray and wash with high-pressure water , remove impurities and dust;

[0053] (2) Pre-hydrolysis: carried out in a steaming ball, the process conditions are: the solid-liquid ratio is 1:3, the temperature is 150°C, the hydrolysis time is 220 minutes, and the pH value of the hydrolysis end point is 3-4;

[0054] (3) Liquid-solid separation and washing, collecting filtrate to obtain extract: use three-stage diafiltration to carry out liquid-solid separation and countercurrent washing on the hydrolyzate, first-stage direct diafiltration or washing and diafiltration with the last batch of second-stage filtrate , the second stage is washed a...

Embodiment 2

[0071] A kind of bamboo dissolving pulp pulping method of pre-extracting hemicellulose, comprises the steps:

[0072] (1) Bamboo material is prepared: with embodiment 1;

[0073] (2) Pre-hydrolysis: carried out in a vertical cooking pot, the process conditions are: the solid-liquid ratio is 1:3, the temperature is 170 ° C, the hydrolysis time is 110 minutes, and the pH value of the hydrolysis end point is 3 to 4;

[0074] (3) Liquid-solid separation and washing, collecting the filtrate to obtain the extract: same as in Example 1;

[0075] (4) The preparation of dissolving pulp by the residue alkali method comprises the following steps in sequence:

[0076] A. Cooking: Carry out in a vertical cooking pot, the process conditions are: the amount of alkali used is 18 to 26% (NaOH, to the initial dry bamboo), the solid-to-liquid ratio is 1: 2.0 to 3.7, and the total heating time is 150 ~240 minutes, the number of small steam releases is ≥2, the first holding temperature is 130~14...

Embodiment 3

[0079] A kind of bamboo dissolving pulp pulping method of pre-extracting hemicellulose, comprises the steps:

[0080] (1) Bamboo material is prepared: with embodiment 1;

[0081] (2) Pre-hydrolysis: carried out in a steaming ball, the process conditions are: the solid-liquid ratio is 1:5, the temperature is 150°C, the hydrolysis time is 240 minutes, and the pH value of the hydrolysis end point is 3-4;

[0082] (3) Liquid-solid separation and washing, collecting the filtrate to obtain the extract: same as in Example 1;

[0083] (4) Preparation of dissolving pulp by residual alkali method: same as in Example 1.

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

No PUM Login to view more

Abstract

The invention relates to a method for producing bamboo dissolving pulp by pre-extracting hemicellulose and a product thereof; the method includes the following steps of: preparing bamboo wood: preparing the bamboo wood into bamboo sheets or bamboo filaments, and washing the bamboo sheets or bamboo filaments to remove impurity and dirt; prehydrolysis: the technical condition requiring solid-to-liquid ratio of 1:0.4-8.0, hydrolysis temperature of 100-200 DEG C, hydrolysis time of 15-240 minutes and a pH value of 2-5 at a hydrolysis end point; liquid solid separation and washing; collecting filtrate to produce extract; and preparing the dissolving pulp by residue alkaline process. The invention has the advantages that the performance index of the dissolving pulp meets the technical requirement of viscose fiber pulp, cellulose acetate, soluble cotton and cellulose ether dissolving pulp, and the method can extract most pentosane in bamboo wood by controlling the prehydrolysis technical condition, has extremely strong pertinence pertinency for the processing of the bamboo fiber materials, improves the reaction performance and evenness of the bamboo dissolving pulp, and reduces the cost for producing the bamboo dissolving pulp and pre-extracting the hemicellulose.

Description

technical field [0001] The invention relates to the fields of chemical engineering, hydrolysis technology and dissolving pulp manufacturing technology, in particular to a bamboo 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 time...

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
IPC IPC(8): D21C3/02D21C1/04D21B1/04D21C1/00D21C7/00D21H11/02C08B37/14C07H3/02C07H3/06C07H7/033C07H1/00C07G1/00C07C53/08C07C31/08C07C31/18D01D1/02
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 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