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

A technology of dissolving pulp and pre-hydrolysis, applied in the direction of pulping with inorganic alkali, pretreatment with acid compounds, non-woody plant/crop pulp, etc., to achieve the effect of saving resources, reducing production and environmental load, and reducing treatment costs

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] So far, there is no idea of ​​comprehensive utilization of lignocellulosic raw materials, through controlling the pre-hydrolysis process to hydrolyze most of the pentosan in bagasse to xylose and extracting and utilizing it, and further through the alkaline pulping method Report on the Complete Technical Scheme of Making Bagasse Dissolving Pulp

Method used

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

Examples

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Embodiment 1

[0060] Provide a kind of method of making bagasse dissolving pulp by improved prehydrolysis alkali method, comprise the steps:

[0061] (1) Bagasse material preparation: adopt the bagasse that removes most of the colloids through natural storage and fermentation, and carry out wet depitting and washing to the bagasse;

[0062] (2) 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 110°C, the liquid ratio is 1:7, and the hydrolysis time is 300 minutes. Finally, collect the hydrolyzate and wash the material;

[0063] (3) Alkaline pulping: including the following steps:

[0064] A, cooking: carry out in the digester, the cooking condition is: for absolute dry pulp amount, the total alkali consumption is 18~26% with NaOH, liquid ratio: 1: 2.0~3.6; Heating total time: 150~240 minutes, Small steam release times ≥ 2, the first holding temperature:...

Embodiment 2

[0075] Provide another kind of improved prehydrolysis alkali method to manufacture the method for bagasse dissolving pulp, comprise the steps:

[0076] (1) bagasse material preparation: with embodiment 1, adopt the bagasse that removes most of colloids through natural storage fermentation, and bagasse is carried out wet depitting and washing;

[0077] (2) Pre-hydrolysis: carried out in a hydrolysis pot, the hydrolysis catalyst is sulfuric acid, the process conditions are: the concentration of sulfuric acid is 1.5wt%, the temperature is 125 ° C, the liquid ratio is 1: 10, and the hydrolysis time is 130 minutes. Finally, collect the hydrolyzate and wash the material;

[0078] (3) Alkaline pulping: with embodiment 1.

Embodiment 3

[0080] Another improved prehydrolysis alkali method is provided to manufacture bagasse dissolving pulp, comprising the steps of:

[0081] (1) bagasse material preparation: with embodiment 1, adopt the bagasse that removes most of colloids through natural storage fermentation, and bagasse is carried out wet depitting and washing;

[0082] (2) pre-hydrolysis: with embodiment 1, carry out in hydrolysis pot, treatment agent is sulfuric acid, and processing condition is: sulfuric acid concentration is 0.7wt%, and temperature is 110 ℃, and liquid ratio is 1: 7, and hydrolysis time is 300 minutes, Use steam to heat, collect the hydrolyzate after hydrolysis, and wash the material;

[0083] (3) Alkaline pulping: including the following steps:

[0084]A. Cooking: Carried out in a digester, the cooking conditions are: for the absolute dry pulp, the total alkali dosage is 18-26% in terms of NaOH, the degree of sulfidation: 15-25%, the liquid ratio: 1: 2.0-3.6; Total time: 150-240 minute...

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Abstract

The invention relates to a method for preparing bagasse dissolving pulp by improved prehydrolysis alkaline process, which comprises the following steps of: bagasse preparation, in which bagasse is subjected to depithing and washing; prehydrolysis, which is carried out in a hydrolyzer or a hydrolysis tank in the presence of a hydrolysis catalyst of sulphuric acid or hydrochloric acid at an acid concentration of 0.1 to 10.0 weight percent, a temperature of between 80 and 140 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 bagasse dissolving pulp meets the requirements of viscose fibre pulp and the like; the improved prehydrolysis process allows the major part of pentosan in the bagasse 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 bagasse 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 material...

Claims

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Application Information

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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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