Method for preparing cellulosic fibers and hemicellulose solution simultaneously

A cellulose fiber and hemicellulose technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of low concentration and expensive membrane modules, and achieve a green process, improve economic feasibility, and the principle is practical Effect

Inactive Publication Date: 2017-02-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the membrane modules are expensive, and the concentration of alkaline solution after purification

Method used

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  • Method for preparing cellulosic fibers and hemicellulose solution simultaneously
  • Method for preparing cellulosic fibers and hemicellulose solution simultaneously
  • Method for preparing cellulosic fibers and hemicellulose solution simultaneously

Examples

Experimental program
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Effect test

Embodiment

[0026] Purification of bleached kraft bamboo pulp by multiple cycles of cold caustic filtrate to obtain high-concentration hemicellulose solution

[0027] (1), cold alkali impregnation of (high whiteness) chemical pulp: the high whiteness chemical pulp is impregnated for 60 minutes with a mass fraction of 8% and a temperature of 25°C in cold alkali solution, and the pulp concentration is 5%, to obtain (high purity) fiber cellulose fiber and cold lye containing hemicellulose;

[0028] (2) Efficient separation of cellulose fibers: After the cold alkali impregnation, use a twin-roll press to efficiently separate the high-purity cellulose fibers and cold lye obtained after the treatment in step (1); The concentration is controlled at 40%, and the obtained cold caustic filtrate is used together with a small amount of soda liquor to impregnate the next batch of chemical pulp with cold caustic;

[0029] (3) Recycling of the cold caustic filtrate: pump the cold caustic filtrate and a...

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Abstract

The invention discloses a method for preparing cellulosic fibers and a hemicellulose solution simultaneously. The method comprises the steps that 1, high-whiteness chemical pulp is impregnated with cold alkali liquid with a certain concentration; 2, after cold alkali impregnating is finished, the high-purity cellulosic fibers and cold alkali filtrate are efficiently separated through a twin-roll squeezer, and cold alkali impregnating is conducted on next-batch chemical pulp through the obtained cold alkali filtrate and a small amount of sodium carbonate liquid; 3, in a similar way, the cold alkali filtrate is constantly recycled and the sodium carbonate liquid is supplemented for cold alkali extraction of multiple batches of chemical pulp; 4, all batches of obtained high-whiteness cellulosic fibers are mixed to be uniform through a pulp mixer and then fed into a washing workshop section; 5, after the concentration of hemicellulose in the obtained cold alkali filtrate reaches an upper limit value, the cold alkali filtrate is fed into a hemicellulose extraction workshop section. The method has the advantages that by adopting the technology that the hemicellulose in the high-whiteness cellulosic fibers is extracted by recycling the cold alkali filtrate multiple times, green and environmental friendliness, economical feasibility and efficient utilization of plant sources are achieved.

Description

technical field [0001] The invention relates to the fields of pulping, papermaking and textile industry, in particular to a method for simultaneously preparing cellulose fiber and hemicellulose solution. Background technique [0002] Dissolving pulp, also known as cellulose fiber, is a kind of high-purity bleached chemical pulp. Its methyl fiber content is generally higher than 90%, and it is mainly used to prepare high value-added cellulose ester and cellulose ether products. The purity of the dissolving pulp is the guarantee of the yield of cellulose derivatives, the higher the purity, the greater the yield. In addition, high-purity dissolving pulp can also ensure higher product yield and lower consumption of derivatization reagents when preparing cellulose derivatives. Therefore, the purification of dissolving pulp is crucial for its use in the manufacture of high value-added cellulose products. At present, there are many purification methods for dissolving pulp, such a...

Claims

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Application Information

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IPC IPC(8): D21C5/00C08B37/14
CPCC08B37/14D21C5/00
Inventor 何亮孙冰柴欣生
Owner SOUTH CHINA UNIV OF TECH
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