Method for preparing bamboo pulp by full-liquid-phase prehydrolysis sulfate displacement cooking process

A technology of displacement cooking and pre-hydrolysis, which is applied in the regeneration of lye, pulping with inorganic alkali, pulp bleaching, etc., can solve the problems of bamboo pulp production capacity limitation, unstable hydrolysis, and long heating time, so as to save heating time and steam, reduce wastewater pollution, and solve the large effect of wastewater pollution

Active Publication Date: 2011-09-14
SICHUAN YONGFENG PAPER MAKING JOINT STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pre-hydrolyzed sulfate method currently adopted at home and abroad uses semi-liquid phase hydrolysis and cooking, so the uniformity of hydrolysis and cooking is still not ideal, and the hydrolyzate is directly discharged, which wastes a lot of heat energy and water re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Material preparation: The bamboo is cut into rectangular pieces of 20-50mm long by a bamboo cutting machine, and the qualified rate is more than 80%.

[0022] Washing: After the bamboo chips are washed by a washing machine, the surface impurities are washed away and excess water is removed before entering the cooking pot.

[0023] Pre-hydrolysis: After washing, the bamboo chips are installed at a pot density of 200kg / m3, and the cooking pot is filled with hydrolyzed liquid and then heated up. After 30 minutes, the temperature is raised to 160°C for 180 minutes. After the hydrolysis is completed, the hydrolyzed liquid is pumped into the hydrolysis The liquid storage tank is used as the next pot of hydrolysis medium.

[0024] Cooking: Sulfate full liquid phase displacement cooking. The amount of alkali used is based on Na2O to 22% of the weight of the dry bamboo, and the degree of vulcanization is based on Na 2 O is 25%, 90 minutes to 145°C, 30 minutes, then 60 minutes to 160°C...

Embodiment 2

[0031] Material preparation: The bamboo is cut into rectangular pieces of 20-50mm long by a bamboo cutting machine, and the qualified rate is more than 80%.

[0032] Washing: After the bamboo chips are washed by a washing machine, the surface impurities are washed away and excess water is removed before entering the cooking pot.

[0033] Pre-hydrolysis: After washing, the bamboo chips are installed at a pot density of 200kg / m3, and the cooking pot is filled with hydrolyzed liquid, and then the temperature is increased. After the hydrolysis is completed, the hydrolyzed liquid is pumped into the hydrolyzed liquid. The liquid storage tank is used as the next pot of hydrolysis medium.

[0034] Cooking: Sulfate full liquid phase displacement cooking. The amount of alkali used is 22% based on Na2O to the weight of the dry bamboo, and the vulcanization degree is 25% based on Na2O. Raise it to 145℃ for 90 minutes and keep 30 minutes, and then raise it to 160℃ for 140 minutes. After the end ...

Embodiment 3

[0041] Material preparation: The bamboo is cut into rectangular pieces of 20-50mm long by a bamboo cutting machine, and the qualified rate is more than 80%.

[0042] Washing: After the bamboo chips are washed by a washing machine, the surface impurities are washed away and excess water is removed before entering the cooking pot.

[0043] Pre-hydrolysis: After washing, the bamboo chips are installed at a pot density of 200kg / m3, and the cooking pot is filled with hydrolyzed liquid, and then the temperature is increased. After the hydrolysis is completed, the hydrolyzed liquid is pumped into the hydrolyzed liquid. The liquid storage tank is used as the next pot of hydrolysis medium.

[0044] Cooking: Sulfate full liquid phase displacement cooking. The amount of alkali used is 22% based on Na2O, and the vulcanization degree is 25% based on Na2O. Raise it to 140°C for 40 minutes and keep it for 20 minutes, then increase it to 160°C for 80 minutes to guarantee 180 minutes. After the end ...

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PUM

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Abstract

The invention discloses a method for preparing bamboo pulp by a full-liquid-phase prehydrolysis sulfate displacement cooking process, which comprises the following steps: preparing materials, washing the materials, prehydrolysizing, cooking, washing, screening, bleaching, regulating polymerization degree, dechlorinating and conducting acid treatment. According to the preparation method, after the cooking is finished, for the obtained pulp, the content of alpha cellulose is more than or equal to 95%, the pepentosan is more than or equal to 4%, and the average polymerization degree is 550-650; after the acid treatment is finished, for the obtained pulp, the content of alpha cellulose is more than or equal to 94%, the pentosan is less than or equal to 3.0%, the average polymerization degree is 400-500, and the white degree is 86-89%. The method has the following advantages: the whole set of technology of full-liquid-phase prehydrolysis, full-liquid-phase cooking, hydrolyzate recovering and recovered black liquid displacement cooking, not only is the waste water pollution degree is alleviated, the temperature rising time and steam amount are saved, the trebling effects of energy saving, emission reduction and yield increasing are achieved, and the problems that the waste water pollution is serious, the energy consumption is high and the output is low in the pulp prepared by the current prehydrolisis sulfate method.

Description

Technical field [0001] The invention belongs to the technical field of chemical fibers, and specifically relates to a method for preparing bamboo pulp by all-liquid-phase pre-hydrolyzed kraft displacement cooking. Background technique [0002] In recent years, as the global energy shortage problem has become increasingly prominent, the prices of non-renewable resources such as coal and oil have continued to rise, causing the price of petrochemical synthetic fibers to rise. Therefore, the search for renewable fibers has become a new trend in the future. Although cotton-like natural fibers have excellent spinnability and reproducibility, their prices are still rising due to their limited production capacity, which is far from meeting the huge fiber market demand. Therefore, another type of renewable fiber-viscose fiber is emerging and becoming the mainstream of renewable fibers. [0003] Among viscose fibers, viscose fibers produced by dissolving spinning technology using wood pulp ...

Claims

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Application Information

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IPC IPC(8): D21C1/00D21C1/02D21C3/02D21C11/04D21C9/12D21C9/00
Inventor 吴和均
Owner SICHUAN YONGFENG PAPER MAKING JOINT STOCK
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