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Sulphite pulping wastewater treatment and recovery process

A technology for pulping waste liquid and sulfite, which is applied in the regeneration of sulfite waste liquid and other directions, can solve the problems of unfavorable environmental protection, low product yield, unstable quality, etc., and achieves reduction of sewage discharge and operating costs. The effect of low and lower production cost

Active Publication Date: 2015-10-28
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such high-purity, high-molecular lignosulfonate can be effectively separated from the waste liquid, but this method will cause secondary pollution, which is not conducive to environmental protection, and the product yield is low and the quality is unstable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 100m 3 The spent sulphite pulping liquor is collected into the feed storage tank. After passing through the stainless steel screen filter to remove suspended particles, it is pumped into the membrane separation system. Driven by the operating pressure of 0.3-0.7MPa, water, reducing sugar, sulfite (bisulfite), and other dissolved substances of small molecules permeate the membrane to become membrane permeate. Substances that cannot pass through the membrane, such as lignosulfonate, are retained. As the filtration proceeds, the insoluble particles are gradually concentrated and enriched. When concentrated to a total solid concentration of 15-25%, dialysis water is added to pass the impurities remaining on the concentrated liquid side through the membrane to further purify the lignosulfonate on the concentrated liquid side. After adding water to feed amount 10-20%, lignin purity (accounting for solids) reaches 85-93%, shut down.

[0056] The membrane permeate of the me...

Embodiment 2

[0061] 200L of sulfite pulping waste liquid, after being treated by a 20 micron filter, is pumped into the plate membrane system, the equipment is started, and the membrane outlet pressure is maintained at 0.4Mpa, the temperature is 60-65 degrees Celsius, and the membrane surface flow rate is 3 m / s. Collect the filtrate. When concentrated to a total solids concentration of 15-25%, add dialysis water. The amount of dialysis water is added to 10-50% of the feed amount, and it is over. Collect the concentrate and filtrate separately. The lignosulfonate in the concentrate is purified and concentrated. Lignosulfonate purity (on solids) increased to 85-93%. The filtrate enters the nanofiltration membrane system. The operating pressure is 3Mpa, and the operating temperature is 60-65 degrees Celsius. Sugar and some ions are intercepted, and the concentrated solution ends when the total solids concentration is 15%.

Embodiment 3

[0063] 200L of sulfite pulping waste liquid, after being treated by a 20 micron filter, is pumped into the ceramic tubular membrane system, the equipment is started, and the membrane outlet pressure is maintained at 0.6Mpa, the temperature is 60-65 degrees Celsius, and the membrane surface flow rate is 3 m / Second. Collect the filtrate. When concentrated to 15-25% total dissolved solids, add dialysis water. The amount of dialysis water is added to 10-50% of the feed amount, and it is over. Collect the concentrate and filtrate separately. The lignosulfonate in the concentrate is purified and concentrated. Lignosulfonate purity (on solids) increased to 85-93%. The filtrate enters the nanofiltration membrane system. Operating pressure 4Mpa, operating temperature 30-35 degrees Celsius. Sugar and some ions are intercepted, and when the total solids concentration of the concentrated solution is 13%, it ends.

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Abstract

The invention discloses a treatment and recycle process for sulfite pulping waste liquid. The treatment and recycle process mainly comprises pretreatment, lignin purification, replacement and modification, nanofiltration and concentration. According to the process, purified lignin sulfonate is obtained by adopting a membrane separation technology; through modification, the sulfonate can be used as a dye dispersant, can be used for preparing a high-efficiency cement dispersant, can also be used for preparing drilling mud diluent and the like, can serve as a raw material of vanillin, and can be used for preparing high-quality food spices and the like; high-value utilization of waste is realized. After the sulfite is treated by the process, over 80 percent of lignin sulfonate, 70 to 90 percent of reducing sugar and 60 to 80 percent of water can be recycled; the production cost can be reduced for production enterprises; waste water emission amount can be greatly reduced; waste solid emission amount can be greatly reduced; the requirement on environment friendliness of the enterprises can be met more easily; the aims of saving energy and reducing emission can be fulfilled for the enterprises.

Description

technical field [0001] The invention relates to waste liquid treatment, in particular to a treatment and recovery process for sulfite pulping waste liquid. Background technique [0002] In recent years, my country's pulp and paper industry has developed rapidly. In 2006, the national pulp consumption reached 52 million tons, of which non-wood pulp accounted for 25%. The sulfite method is an important chemical pulping method. The earliest sulfurous acid pulping method was the traditional acidic sulfite method. This pulping method has low production cost, and the prepared pulp is lighter in color and can be directly used to produce many kinds of paper without bleaching. Pulp has high purity and is easy to further process and refine. However, the cooking waste liquid produced in this pulping process lacks a better recovery and treatment method, and the method for recovering chemicals and heat energy from the cooking waste liquid has low economic benefits. Therefore, in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/02
Inventor 王修义杨昊鹏钱勇
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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