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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 problems of comprehensive utilization of bagasse, achieve considerable economic benefits, reduce comprehensive production costs, and reduce The effect of non-sugar organic debris content

Inactive Publication Date: 2009-12-30
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

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

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  • 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 ...

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Abstract

The invention relates to a method for preparing bagasse dissolving pulp and pre-extracting hemicellulose and products thereof; the method comprises the following steps: bagasse preparation which comprises the steps of depithing and washing; prehydrolysis which is carried out in a globe digester or a hydrolysis boiler; wherein, the process conditions are as follows: in the process for depithing and oven-drying bagasse, the solid-to-liquid ratio is 1:0.4-8.0, the hydrolysis temperature is 100-200 DEG C, the hydrolysis time is 15-240min, the pH value of the end point of hydrolysis is 2-5; in the process of the solid-to-liquid separation and washing, the filtrate is collected to prepare extracting solution; dissolving pulp is 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

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Application Information

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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
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