Steaming process for modifying bleaching bamboo paper pulp and bleaching wood paper pulp into dissolving pulp in compound way

Abstract

The invention discloses a steaming process for modifying bleaching bamboo paper pulp and bleaching wood paper pulp into dissolving pulp in a compound way. Compound paper pulp is steamed in a continuous steamer, wherein a continuous steaming pipe of the continuous steamer has three sections, one section connected with a pre-reaction storage bin is provided with steam pipes and a T-shaped pipe, and the other two sections are provided with steam pipes, and steam is introduced into the continuous steamer through the steam pipes; and alkali liquor is added into the continuous steaming pipe through the T-shaped pipe, and the alkali liquor is NaOH and is added in an amount which is 17 to 23 percent of absolute dry weight. According to the steaming process, the bleaching bamboo paper pulp and the bleaching wood paper pulp are used as raw materials, so that the cost for preparing the dissolving pulp is greatly reduced, and requirements on quality of the dissolving pulp for viscose fiber are met.

Description

technical field [0001] The present invention relates to a method for compound modification of bleached bamboo pulp and bleached wood pulp into dissolving pulp, in particular to a method for compound modification of bleached bamboo pulp and bleached wood pulp into dissolving pulp, wherein the dissolving pulp refers to pulp for viscose fiber Meal, cellulose and cellulose derivatives. Background technique [0002] The application number is 200710050470.9, the authorized announcement number is CN101158125, and the authorized announcement date is April 9, 2008. The Chinese invention patent discloses a paper-making grade coniferous wood pulp board modification process, wherein the cooking process uses paper-making grade wood pulp board Use caustic soda method, sulfate method or sulfite method for cooking, and the cooking agents are NaOH, NaOH+Na 2 S, Na 2 SO 3 + NaOH, the process conditions are: 1. The total alkali concentration of the cooking liquid by the caustic soda method...

AI Technical Summary

Problems solved by technology

But the bamboo pulp prepared by this invention has the following disadvantages: 1, the yield is low, and the highest yield is only 85%

2. The α-cellulose content fluctuates greatly, from 85% to 95%, which makes the modified bamboo pulp α-cellulose content unstable

3. The average length of fibers is lower than that of paper-making wood fibers, and the content of ash and polypentose in the production process is high, and the bamboo fibers are hard, have more thick-walled fibers, narrow cell lumens, dense fiber tissues, and the presence of air in the cells leads to dissolution Difficult, large amount of chemicals

4. The viscose fiber produced by a single bamboo pulp has monotonous performance and does not show individuality

But this invention is only applicable to the modification of cotton linters and is prepared into viscose fiber. If the composite material is modified by the method provided by the invention to prepare dissolving pulp, the quality index of the modified dissolving pulp cannot reach that of dissolving pulp. Requirements, and high energy consumption, low yield

[0007] To sum up, the above-mentioned invention patents mainly have the following disadvantages: 1. The raw material is single, and the dissolving pulp produced has single performance and does not show individuality

2. A single raw material has its own disadvantages, such as high production cost, low yield, and unstable product quality

3. Outdated production equipment, high energy consumption, and uneven cooking