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Straw pulp black liquor concentration process

A straw-pulp black liquor and process technology, which is applied to the regeneration of concentrated waste liquor and lye, can solve the problems of high cost, high activation energy and high energy consumption, and achieve the effects of less energy consumption, wide application and easy treatment.

Active Publication Date: 2009-07-22
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkaline straw pulp black liquor has high silicon content, high viscosity, high activation energy, many semi-fibers and miscellaneous cells, and is easy to deteriorate and produce precipitation. Therefore, it consumes a lot of energy and costs a lot when evaporating and concentrating

Method used

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  • Straw pulp black liquor concentration process
  • Straw pulp black liquor concentration process
  • Straw pulp black liquor concentration process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Alkaline straw pulp black liquor has a fiber content of 200mg / L, a Baume degree of 2, a solid content of 4%, and a pH of 9; the temperature is 60°C, and the straw pulp black liquor is flashed in two steps to obtain flashed straw pulp The black liquor and flash steam are passed into the III-effect and IV-effect evaporators respectively.

[0049] The straw pulp black liquor after flash evaporation is subjected to five-effect evaporation. The five-effect evaporation process is countercurrent multi-effect evaporation. The straw pulp black liquor after flash evaporation flows in from the V effect, and the heating steam flows in from the I effect. After the black liquor is heated and evaporated by the V effect, IV effect and III effect in turn, it becomes a low-semi-concentrated black liquor. The liquid is again heated and evaporated through the II effect and the I effect in turn, and becomes thick black liquor.

[0050] The above-mentioned heating steam has a temperature of...

Embodiment 2

[0058] Alkaline straw pulp black liquor fiber content 100mg / L, Baume degree 9, solid content = 15%, pH = 13

[0059] The soda-process straw pulp black liquor is directly subjected to five-effect evaporation. The five-effect evaporation process is countercurrent multi-effect evaporation. The straw pulp black liquor flows in from the V effect, and the heating steam flows in from the I effect. The straw pulp black liquor passes through the V effect and the IV effect in turn. , After heating and evaporating in effect III, it becomes low-semi-concentrated black liquor, and after heating and evaporating through effect II and I, the low-semi-concentrated black liquor turns into semi-concentrated black liquor, and the semi-concentrated black liquor passes through effect II and I again Efficient heating and evaporation, turning into thick black liquor. .

[0060] The above-mentioned heating steam has a temperature of 200°C and a pressure of 0.4MPa. After flowing in from the I effect, ...

Embodiment 3

[0068] Alkaline straw pulp black liquor has a fiber content of 50mg / L, a Baume degree of 6, a solid content of 10%, and a pH of 10; at a temperature of 70°C, the straw pulp black liquor is subjected to one-step flash evaporation to obtain the straw pulp black liquor after flash evaporation. liquid. The flashed steam is passed into the III effect evaporator.

[0069] The straw pulp black liquor after flash evaporation is subjected to five-effect evaporation. The five-effect evaporation process is countercurrent multi-effect evaporation. The straw pulp black liquor after flash evaporation flows in from the V effect, and the heating steam flows in from the I effect. After the black liquor is heated and evaporated by the V effect, IV effect and III effect in turn, it becomes a low-semi-concentrated black liquor. The liquid is again heated and evaporated through the II effect and the I effect in turn, and becomes thick black liquor.

[0070] The above-mentioned heating steam has ...

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Abstract

The invention relates to a process for concentrating straw pulp black liquor. When the production process is used for evaporating and concentrating the black liquor, the energy resource consumption is little, the efficiency is high, the produced solid in the concentrated black liquor mainly comprises alkali lignin which has wide application; and the alkali lignin can be used as raw materials of various products with extremely high economic value and for preparing excellent water reducing agent, and can be added by little crosslinking agent so as to prepare lignin sand solidification agent.

Description

technical field [0001] The invention provides a process for concentrating straw pulp black liquor, which belongs to the field of straw pulp black liquor treatment. Background technique [0002] More than 80% of the raw materials of my country's papermaking industry are grass fibers. There are two main types of grass fiber papermaking, alkali pulping and sulfite pulping, and the alkali method is the main method in the sulfite method. Alkaline pulping is a method of treating plant fiber raw materials with an aqueous solution of alkaline chemicals to dissolve the lignin in the raw materials and separate the fibers from them into pulp. [0003] After alkaline pulping, about 50% of the fiber raw materials and most of the alkaline substances are dissolved in the cooking liquor to become black liquor. The black liquor wastewater contains pentosan, lignin, sulfate soap and alkali substances. So the waste water is black. CODcr is generally around 100,000-180,000 mg / L, pH value is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/10D21C11/04
Inventor 李洪法宋明信郭良进陈学涛周长青杨茂峰王安保
Owner SHANDONG TRALIN PAPER
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