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Vapor pre-hydrolysis technique for material slice of bamboo wood dissolving pulp

A technology of pre-hydrolysis and dissolving pulp, applied in water/steam pretreatment, pulping with inorganic alkali, etc., can solve the problems of increasing the load of sewage treatment in sewage stations, poor quality of bamboo dissolving pulp, increasing evaporation load, etc. Achieve the effect of reducing treatment costs, facilitating deep delignification and reducing damage

Inactive Publication Date: 2013-10-16
CHONGQING LEE & MAN PAPER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the pre-hydrolysis process of existing bamboo dissolving pulp flakes, boiling pre-hydrolysis is the main method, and the pre-hydrolysis waste liquid produced by it has a large output and low concentration. If it enters the dilute black liquor system for evaporation treatment, it will lead to dilute The concentration of black liquor is low, increasing the evaporation load, which greatly increases energy consumption. If it is directly discharged to the sewage station without treatment, it will increase the sewage treatment load of the sewage station; and the quality of the bamboo dissolved pulp produced is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A steam prehydrolysis process of bamboo dissolving pulp comprises the following process steps.

[0028] (a) Steam potting: the bamboo raw material is made into flakes, transported to the cooking pot, and the low-pressure steam is passed into the cooking pot while the flakes are conveyed; the low-pressure steam is passed into the cooking pot through the steam potting device, and the pressure of the low-pressure steam 0.4Mpa.

[0029] (b) Steam heating pre-hydrolysis: After the steam is installed in the pot, first use low-pressure steam to heat, and then use medium-pressure steam to heat, so that the temperature in the cooking pot reaches 171 ° C, so that the sheet material is pre-hydrolyzed; the pressure of low-pressure steam is 0.4Mpa , the pressure of the medium-pressure steam is 1.0Mpa; the hydrolysis reaction is controlled by the P factor, and the P factor is 600; the total time of steam heating and pre-hydrolysis is 130 minutes.

[0030] (c) White liquor neutraliza...

Embodiment 2

[0033] A steam prehydrolysis process of bamboo dissolving pulp comprises the following process steps.

[0034] (a) Steam potting: the bamboo raw material is made into flakes, transported to the cooking pot, and the low-pressure steam is passed into the cooking pot while the flakes are conveyed; the low-pressure steam is passed into the cooking pot through the steam potting device, and the pressure of the low-pressure steam 0.5Mpa.

[0035] (b) Steam heating pre-hydrolysis: After the steam is installed in the pot, first heat with low-pressure steam, and then heat with medium-pressure steam, so that the temperature in the cooking pot reaches 172 ° C, so that the sheet material is pre-hydrolyzed; the pressure of low-pressure steam is 0.5Mpa , the pressure of the medium-pressure steam is 0.9Mpa; the hydrolysis reaction is controlled by the P factor, and the P factor is 575; the total time of steam heating and pre-hydrolysis is 120 minutes.

[0036] (c) White liquor neutralization...

Embodiment 3

[0039] A steam prehydrolysis process of bamboo dissolving pulp comprises the following process steps.

[0040] (a) Steam potting: the bamboo raw material is made into flakes, transported to the cooking pot, and the low-pressure steam is passed into the cooking pot while the flakes are conveyed; the low-pressure steam is passed into the cooking pot through the steam potting device, and the pressure of the low-pressure steam It is 0.6Mpa.

[0041] (b) Steam heating pre-hydrolysis: After the steam is installed in the pot, first heat with low-pressure steam, and then heat with medium-pressure steam, so that the temperature in the cooking pot reaches 173°C, so that the sheet material is pre-hydrolyzed; the pressure of low-pressure steam is 0.6Mpa , the pressure of the medium-pressure steam is 0.9Mpa; the hydrolysis reaction is controlled by the P factor, and the P factor is 550; the total time of steam heating and pre-hydrolysis is 120 minutes.

[0042] (c) White liquor neutraliza...

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Abstract

The invention belongs to the technical field of dissolving pulp preparation and relates to a vapor pre-hydrolysis technique for a material slice of bamboo wood dissolving pulp, which comprises the following steps of: (a) introducing vapor to a boiler; (b) vapor heating and pre-hydrolyzing; (c) neutralizing through white liquor; and (d) replacing through hot black liquor. According to the invention, the vapor is introduced for directly heating, so that the generated pre-hydrolysis waste water quantity is greatly decreased, and the influence of the waste water to the concentration of the rear black liquor is greatly decreased after the waste water is recycled to a rear black liquor system. In such a treatment manner, little influence is caused to an evaporation working segment, relieving the waste water treating load of a sewage plant is reduced, the treatment cost is effectively reduced and the production cost is reduced, so that the influence to the environment is reduced. In the invention, a large amount of hemicellulose and a part of lignin are separated out, and the cell cavities of the slices are fully opened to deeply separate out the lignin to reduce damage on alpha-fiber and improve the yield and the quality of the bamboo wood dissolving pulp.

Description

technical field [0001] The invention belongs to the technical field of preparing dissolving pulp, in particular to a steam prehydrolysis process of bamboo dissolving pulp. Background technique [0002] Dissolving pulp is a high-purity refined pulp, mainly used for the production of fiber derivatives such as textile viscose fiber, nitrocellulose, acetate fiber, cellophane, carboxymethyl cellulose, etc. Dissolving pulp has a wide range of uses, and the market demand larger. [0003] my country is rich in bamboo, which has many varieties and wide distribution, and has relatively rich bamboo forest resources, especially in the south, where bamboo is planted on a large scale in most areas, among which the bamboo forest resources in Sichuan, Hunan, Guangxi, Yunnan and Chongqing are the most Rich and concentrated, it has great economic development value. Bamboo dissolving pulp not only has similar or the same chemical and physical properties as cotton and wood dissolving pulp, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C1/02D21C3/02
Inventor 李文俊
Owner CHONGQING LEE & MAN PAPER MFG
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