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Technique for producing dissolving pulp from whole cotton stalks

A technology of dissolving pulp and process, applied in the field of dissolving pulp

Inactive Publication Date: 2012-08-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problem that dissolving pulp prepared with cotton linters as raw material cannot meet the demand, the present invention provides a process for producing dissolving pulp using all cotton stalks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Pre-hydrolysis with additives-KP / AQ-OHP-post-hydrolysis process with additives to treat cotton stalk raw materials

[0031] (1) Take 500g of 20-40mm Changshan cotton stalks, the polypentose content of which is 18.3%, the pre-hydrolysis process conditions of controlling the addition of hydrolysis aid a are: liquid ratio 1:4, hydrolysis aid a plus The content is 0.2% of the mass of cotton stalks, the maximum temperature is 150°C, the holding time is 90 minutes, the content of pentosan after hydrolysis is 7.2%, and the hydrolysis yield is 84%;

[0032] (2) The hydrolyzed slurry is subjected to KP / AQ cooking;

[0033] (3) The pulp after cooking is subjected to OHP three-stage bleaching;

[0034] (4) The post-hydrolysis process conditions after adding additives are: liquid ratio 1:6, the amount of hydrolysis additive b is 0.05% of the dry pulp mass, the maximum temperature is 100°C, and the holding time is 180 minutes.

[0035] The α-cellulose content of the who...

Embodiment 2

[0039] Example 2: Pre-hydrolysis with additives-KP / AQ-OHP-post-hydrolysis process with additives to treat cotton stalk raw materials

[0040] (1) Take 500g of 20-40mm long cotton stalks produced in Xinjiang, and its polypentose content is 20.1%. The pre-hydrolysis process conditions for controlling the addition of additives are: liquid ratio 1:8, and the amount of hydrolysis additive a is 0.2% of the mass of cotton stalks, the highest temperature is 170°C, the holding time is 180 minutes, the content of pentosan after hydrolysis is 7.8%, and the hydrolysis yield is 82%;

[0041] (2) The hydrolyzed slurry is subjected to KP / AQ cooking;

[0042] (3) The pulp after cooking is subjected to OHP three-stage bleaching;

[0043] (4) The post-hydrolysis process conditions after adding additives are: liquid ratio 1:10, the amount of hydrolysis additive b is 0.30% of the dry pulp mass, the maximum temperature is 140°C, and the holding time is 90 minutes.

[0044] The α-cellulose conten...

Embodiment 3

[0049]The hydrolysis aid a among the embodiment 2 is changed into sulfuric acid by boric acid and fatty alcohol polyoxyethylene ether phosphate, use the cotton rod of same quality specification, after hydrolysis, polypentose content is 8.6%, and hydrolysis yield is 81%,

[0050] Steps (2), (3) and (4) are exactly the same as in Example 2. The α-cellulose content of the obtained cotton stalk pulp is 88%, the polypentose is 4.8%, the viscosity is 350ml / g, and the whiteness 78% ISO with a responsive performance of 220 seconds.

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Abstract

The invention relates to the technical filed of a dissolving pulp, in particular to a technique for producing a dissolving pulp from whole cotton stalks. The technique comprises the steps of adding a hydrolysis accessory ingredient a into cotton stalks; performing pre-hydrolysis at a certain temperature for a certain time; carrying out KP / AQ cooking for the hydrolyzed pulp; performing OHP bleaching on the cooked pulp in three stages; and adding a hydrolysis accessory ingredient b into the bleached pulp for post-hydrolysis to obtain the dissolving pulp. According to the technique for producing the dissolving pulp from whole cotton stalks, hemi-cellulose is greatly dissolved out from the cotton stalks with the help of the pre-hydrolysis of the added accessory ingredient firstly; finally the content of the hemi-cellulose in the cotton stalks is further reduced by the post-hydrolysis of the added accessory ingredient; the processes of KP / AQ cooking and OHP bleaching are combined to prepare the cotton stalk dissolving pulp which is high in alpha-cellulose content, low in pentosan content, low in hemi-cellulose content and high in reactivity; and the adopted chemical products are clean and environment-friendly by utilization of the technique provided by the invention for processing whole cotton stalks.

Description

technical field [0001] The invention relates to the technical field of dissolving pulp, in particular to a process for producing dissolving pulp by using all cotton stalks. Background technique [0002] Dissolving pulp is mainly used as rayon, rayon, rich and strong fiber, tire cord, acetate fiber, enteric tablet sugar coating, medical artificial kidney, cigarette filter, film, carboxymethyl cellulose, nitrocellulose and paper body armor. Raw materials have a wide range of uses and have become one of the important raw materials for modern light, textile, pharmaceutical, chemical, military and other industries. [0003] The main raw material for domestic dissolving pulp production is cotton linters. However, due to the increase in viscose production in recent years, the demand for raw materials has increased. Cotton linters can no longer meet the needs of the chemical fiber industry for it. It is imperative to develop new raw materials. . Research and exploration in this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C9/10D21C9/16
Inventor 吴朝军赵传山于冬梅甄朝晖褚夫强韩文佳周淑芳
Owner QILU UNIV OF TECH
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