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Process for Producing Dissolving Pulp Using Bleached Wood Pulp Board

A technology of dissolving pulp and process, which is applied in the direction of pulp bleaching, pulping with inorganic alkali, pulping of cellulose raw materials, etc., to achieve the effect of simple process flow

Inactive Publication Date: 2011-12-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The α-cellulose content of bleached wood pulp board is generally greater than 85%, which is a good raw material for viscose pulp, but the use of these raw materials to produce dissolving pulp is mainly Faced with the problems of difficulty in increasing the content of α-cellulose, selective removal of hemicellulose, uniform decrease in viscosity and poor reactivity, the quality and grade of the prepared dissolving pulp are low, and it is difficult to meet the raw material requirements for high-end product production
[0005] At present, the technologies for increasing α-cellulose content in dissolving pulp, reducing hemicellulose and improving reaction performance mainly include high-temperature acid hydrolysis\steam hydrolysis of pulp followed by cooking -Bleaching and alkaline cooking-bleaching methods, in which high-temperature acid hydrolysis\steam hydrolysis and then cooking-bleaching process faces the low pH value of the waste liquid in the hydrolysis stage, which is difficult to handle, the production cost of dissolving pulp is high, and the degree of polymerization of dissolving pulp is very high Difficult to adjust uniformly, poor reactivity; alkaline cooking-bleaching process faces problems such as low α-cellulose content, high pentose content, and poor reactivity in the produced dissolving pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A process for producing dissolving pulp utilizing bleached wood paddle boards, comprising the following steps:

[0032] (1) Take 4.5 tons of dry bleached coniferous wood NBKP pulp board with a brightness of 82%ISO, add 0.5% of dry pulp weight additives and 18% sodium hydroxide, the liquid ratio is 1:3.5, and the additives are Ethylenediamine, sodium borate, sodium bisulfite, sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether are mixed at a weight ratio of 1:1:1:1:1, and the temperature is raised to 170°C within 70 minutes After cooking for 120 minutes, the cooked pulp contains 93.8% of α-cellulose, 3.65% of polypentose, and a viscosity of 13.2 mPa·s;

[0033] (2) The pulp obtained in step (1) is subjected to H bleaching, the amount of available chlorine is 1.5% of the dry pulp weight, the bleaching temperature is 50°C, the reaction is 90 minutes, the pulp concentration is 8wt%, and the pH is in the range of 9-10;

[0034] (3) Dechlorinate the pulp b...

Embodiment 2

[0041] A process for producing dissolving pulp utilizing bleached wood paddle boards, comprising the following steps:

[0042] (1) Take 4.5 tons of dry bleached broad-leaved wood LBKP pulp board with a brightness of 83% ISO, add 0.5% of dry pulp weight additives and 16% sodium hydroxide, the liquid ratio is 1:4.5, and the additives are Ethylenediamine, sodium borate, sodium bisulfite, sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether are mixed at a weight ratio of 1:1:1:1:1, and the temperature is raised to 160°C within 100 minutes , boiled for 240 minutes; after cooking, the α-cellulose content was 94.8%, the pentosan content was 3.4%, and the viscosity was 12.1 mPa·s;

[0043] (2) The pulp obtained in step (1) is bleached with H by controlling the pulp concentration to 8wt%, the amount of available chlorine is 1% of the dry pulp weight, the bleaching temperature is 40°C, the bleaching time is 120 minutes, and the pH is controlled at 9-10 within the scop...

Embodiment 3

[0051] A process for producing dissolving pulp utilizing bleached wood paddle boards, comprising the following steps:

[0052] (1) Take 4.5 tons of dry bleached coniferous wood NBKP pulp board with a brightness of 84%ISO, add 0.25% of dry pulp weight additives and 15% sodium hydroxide, the liquid ratio is 1:6, and the additives are Ethylenediamine, sodium borate, sodium bisulfite, sodium dodecylbenzenesulfonate and fatty alcohol polyoxyethylene ether are mixed at a weight ratio of 1:1:1:1:1, and the temperature is raised to 160°C within 100 minutes , boiled for 120 minutes; after cooking, the content of α-cellulose was 92.9%, the content of pentosan was 3.94%, and the viscosity was 13.8 mPa·s;

[0053] (2) The pulp obtained in step (1) is bleached with H by controlling the pulp concentration to 5wt%, the amount of available chlorine is 0.5% of the dry pulp weight, the bleaching temperature is 40°C, the bleaching time is 120 minutes, and the pH is controlled at 9-10 within the...

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Abstract

The invention relates to a process for producing dissolving pulp by utilizing a bleaching wood pulp board, which belongs to the technical field of dissolving pulp. The process comprises the following steps of: adding an aid and alkali into a blenching chemical wood pulp board, treating at the temperature of between 165+ / -5 DEG C for 120 to 240 minutes; performing H blenching; dechlorinating; and performing acidification treatment, wherein the aid is obtained by mixing quadrol, sodium borate, sodium hydrogensulfite, sodium dodecyl benzene sulfonate and fatty alcohol-polyoxyethylene ether in a weight ratio of 1:1:1:1:1. In the process, hemicellulose is dissolved out by caustic cooking of adding the aid to reduce the viscosity of cooked bleaching chemical pulp; and the cooked pulp is bleached, and the viscosity is adjusted, so that the content of alpha-cellulose in the dissolving pulp is improved, the polyprenol content is reduced, and the reaction performance of wood dissolving pulp is improved. When the process provided by the invention is used to treat the bleached pulp board, the process flow is short, and chemicals used are clean and environment-friendly.

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 bleached wood paddle boards. Background technique [0002] At present, the international demand for dissolving pulp is increasing day by day. The world's demand for dissolving pulp exceeds 3 million tons, while the output is only more than 2 million tons. 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. Cotton linters are the short hairs still attached to the cottonseed aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C9/12
Inventor 吴朝军赵传山王代启于冬梅李荣刚杨延昭
Owner QILU UNIV OF TECH