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Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof

A technology of dissolving pulp and pre-hydrolysis, which is applied in pulping with inorganic alkali, pretreatment with acidic compounds, non-woody plant/crop pulp, etc., can solve the problems of process shortening and waste of resources, and achieve the reduction of processing costs and comprehensive The effect of low production cost

Inactive Publication Date: 2009-08-26
上海士林纤维材料有限公司
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  • 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 all pentosan is removed as waste, which is a waste of resources
[0013] But so far, there has not been a comprehensive utilization of lignocellulosic raw materials, by controlling the pre-hydrolysis process to hydrolyze most of the pentosan in bamboo to xylose, extracting and utilizing it, and further pulping with alkali A report on the method of making bamboo dissolving pulp

Method used

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  • Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof
  • Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof
  • Method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process and product thereof

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Effect test

Embodiment 1

[0066] Provide a kind of method that the improved pre-hydrolysis alkali method manufactures bamboo dissolving pulp, comprises the steps:

[0067] (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;

[0068] (2) Pretreatment: carried out in a hydrolysis pot, the treatment agent is sulfuric acid, and the process conditions are: the sulfuric acid concentration is 0.1wt%, the temperature is 110 ° C, the liquid ratio is 1: 10, the treatment time is 60 minutes, and the treatment is discharged after the pretreatment liquid, and washing material;

[0069] (3) Pre-hydrolysis: carried out in a hydrolysis pot, the hydrolysis catalyst is sulfuric acid, and the process conditions are: the concentration of sulfuric acid is 0.7wt%, the temperature is...

Embodiment 2

[0081] Provide another kind of improved prehydrolysis alkali method to manufacture the method for bamboo dissolving pulp, comprise the steps:

[0082] (1) Bamboo material preparation: with embodiment 1, two to three-year-old bamboo materials are cut into long 15~30mm, wide 10~20mm, thick 3~8mm bamboo slices by slicer, screened by high-frequency vibrating sieve, and use high-pressure Spray washing with water to remove impurities and dust;

[0083] (2) pretreatment: with embodiment 1, carry out in hydrolysis pot, treatment agent is sulfuric acid, and process condition is: sulfuric acid concentration is 0.1wt%, and temperature is 110 ℃, and liquid ratio is 1: 10, and treatment time is 60 minutes, After pretreatment, the treatment liquid is discharged and the material is washed;

[0084] (3) Pre-hydrolysis: carried out in a hydrolysis pot, the hydrolysis catalyst is sulfuric acid, the process conditions are: the acid concentration is 1.5wt%, the temperature is 125 ° C, the liquid...

Embodiment 3

[0087] Provide another kind of improved prehydrolysis alkali method to manufacture the method for bamboo dissolving pulp, comprise the steps:

[0088] (1) Bamboo material preparation: with embodiment 1, two to three-year-old bamboo materials are cut into long 15~30mm, wide 10~20mm, thick 3~8mm bamboo slices by slicer, screened by high-frequency vibrating sieve, and use high-pressure Spray washing with water to remove impurities and dust;

[0089] (2) pretreatment: with embodiment 1, carry out in hydrolysis pot, treatment agent is sulfuric acid, and technological condition is: sulfuric acid concentration is 0.1wt%, and temperature is 110 ℃, and liquid ratio is 1: 10, and treatment time is 60 minutes, After pretreatment, the treatment liquid is discharged and the material is washed;

[0090] (3) pre-hydrolysis: with embodiment 1, carry out in hydrolysis pot, hydrolysis catalyst is sulfuric acid, and process condition is: sulfuric acid concentration is 0.7wt%, and temperature is...

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Abstract

The invention relates to a method for preparing bamboo dissolving pulp by improved prehydrolysis alkaline process, which comprises the following steps of: bamboo material preparation, in which bamboo is made into bamboo sheets and bamboo threads, the bamboo sheets and threads are washed to remove impurities and dust; pretreatment, which is for removing more organic and nonorganic impurities, and in which the loss of pentosan is less than 2 percent; prehydrolysis, which is carried out at an acid concentration of sulphuric acid and hydrochloric acid of 0.1 to 10.0 weight percent, a temperature of between 80 and 14 DEG C and a liquor ratio of 1:4-15 for 30 to 400 minutes; and alkaline process. The method has the advantages that: the performance index of the bamboo dissolving pulp meets the requirements of viscose fibre pulp and the like; the improved prehydrolysis process allows the major part of pentosan in the bamboo to be hydrolyzed; the hydrolysate can be used as a raw material for xylose, xylitol, L-Arabinitol, ethanol and other products; the improved prehydrolysis process lays a good foundation for cooking and improving the reaction performance of the dissolving pulp; little production cost is added, the treatment load and cost of waste are reduced with the recovery of the products of the prehydrolysis, and the comprehensive cost is the lowest; and the comprehensive utilization of the components of biomass is realized during the pulping process of the dissolving pump.

Description

technical field [0001] The invention relates to the fields of chemical engineering, hydrolysis technology and dissolving pulp manufacturing technology, in particular to an improved prehydrolysis alkali method for manufacturing bamboo dissolving pulp 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. Viscose fiber pulp is one of the most important varieties. The viscose fiber pulp industry has formed a complete raw material and technology system 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 also increased significantly, and a large amount of wood pulp needs to be imported every year, and the bottleneck contradiction of raw materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C1/04D21C3/02D21H11/12
Inventor 吴学东陈惠敏朱丹
Owner 上海士林纤维材料有限公司
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