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New process for black liquor free chemical preparation of pulp

A process and black liquor technology, applied in the field of deep development and application of biomass, can solve the problems that the mechanical properties are difficult to achieve chemical pulp, etc., and achieve the effects of water circulation, no sewage discharge, increased yield, and simple operation process

Active Publication Date: 2014-01-15
BEIJING INSIGHT BIOMASS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned invention simultaneously develops the process of directly making pulp by using lime, but the mechanical properties are difficult to reach the level of chemical pulp. The present invention is the latest development based on the above-mentioned basis A new black liquor-free chemical pulping process using lime and sulfate to produce precipitation and strong alkali

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Controlled experiment:

[0029] Add 431g of bamboo with a water content of 42%, 25g of NaOH and 895g of water into the cooking pot, soak at 105°C for 90 minutes, heat up to 125°C and cook for 150 minutes, perform solid-liquid separation after cooking, and beat and sieve the cooked bamboo And papermaking, the pulp yield is 69.5%, SR°=40, the paper weight is 80g, the measured whiteness is 22.7, and the burst index is 3.26kPa·m 2 / g, the number of folding times is 51, the tensile index is 28.3N m / g, and the tear index is 17.2mN m / g 2 / g, the COD of black liquor is 83900, and solid content 8.5%, pH is 10.46;

Embodiment 2

[0031] Effect experiment of aluminum sulfate treatment black liquor:

[0032] Add 431g of bamboo with a water content of 42%, 25g of NaOH and 495g of water into the cooking pot. After soaking at 105°C for 90 minutes, heat up to 125°C and cook for 150 minutes. Aluminum sulfate is flocculated and adsorbed, and the pulp adsorbed with organic matter such as lignin obtained by filtration has a pulp yield of 74.7%, SR°=40, paper weight of 80g, measured whiteness of 21.8, and burst index of 3.60kPa m 2 / g, the number of folding times is 55, the tensile index is 29.2.3N m / g, and the tear index is 19.0mN m / g 2 / g, the filtrate COD is 72300, the solid content is 7.8%, and the pH is 7.20.

Embodiment 3

[0034] Application of filtrate and compound alkali cooking effect experiment

[0035] Get 250g of bamboo after folding, add 975g of aluminum sulfate treated black liquor and dilute the filtrate COD to be 2750, add 25g of calcium hydroxide, add 44.8g of sodium sulfate to make the molar weight of sulfate radicals the same as calcium, and the pH is 13.32 now. Compared with saturated calcium hydroxide pH = 12.82, the hydroxide concentration is increased by 3.2 times. After soaking at 95°C for 12 hours, cooking at 165°C for 3.5 hours, spraying is carried out to obtain fiber pulp papermaking. The pulp yield is 83.5%, and the beating degree is SR° =40, the quantitative value is 80g, and the Kappa value is 163, the whiteness is 20.6, and the burst index is 2.45kPa·m 2 / g, the number of folding times is 64, the tensile index is 29.0N m / g, and the tear index is 14.2mN m / g 2 / g, COD is 60100, and pH is 9.94.

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Abstract

The invention relates to a black liquor free new process for producing high-yield and high-quality fibers. The process comprises the steps: with utilization of an alkali liquid, pretreating, stewing, carrying out pulp grinding to obtain a mixture of the fibers and a black liquor, adding a certain amount of aluminum sulfate after stewing or before pulp grinding, so as to make lignin of the black liquor settle on the fibers to become a component of the pulp raw material. A filtrate is appropriately added with a reacting amount of lime to be as a next batch of the alkali liquid for stewing to prepare the pulp and is repeatedly used, and thus the black liquor is eliminated. The new process is a revolution of a traditional pulping technology, provides a brand new combined clean production technology, ingeniously utilizes a double decomposition reaction of sulfate and calcium hydroxide to realize high-efficiency pulping with replacement of caustic soda with cheap lime, moreover, also utilizes complexation, flocculation and neutralization of aluminum sulfate to recycle effective components in the black liquor, allows the yield to be not lower than a mechanical pulp and the quality to be as good as a chemical pulp, allows the black liquor to be recyclable, can completely eliminate pulping pollutions, and has remarkable social, economic and ecological benefits.

Description

technical field [0001] The technology belongs to the field of deep development and application of biomass, and can be widely used in the fields of pulping, papermaking and new materials. Background technique [0002] At present, cellulose has been widely used in many fields, the most important use of which is papermaking. Paper is a necessity in national production and life. In 2012, China's paper and paperboard output exceeded 100 million tons, accounting for 23.5% of the world's total output, ranking first in the world. The pulp and paper industry is one of the important industries of our country's national economy. With the progress of human society, the pulp and paper industry and new material industry will have great development potential. [0003] At present, the pulp and paper industry is facing challenges. A large number of small pulp and paper mills are forced to close due to high energy consumption and non-standard discharge of sewage. Over the years, due to the...

Claims

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Application Information

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IPC IPC(8): D21C3/02
CPCD21C3/02D21H17/66
Inventor 尹应武万鹏喻宏贵张玉娟孙响响张玲燕
Owner BEIJING INSIGHT BIOMASS
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