Alkali recovery process for paper-making black liquid

A papermaking black liquor and process technology, which is applied in the field of alkali recovery technology, can solve the problems of high energy consumption, unrecoverable alkali, lignin and cellulose, waste of raw materials, etc., and achieves low energy consumption, low environmental pollution, and reduced The effect of production costs

Inactive Publication Date: 2013-05-01
SHANDONG TIANWEI MEMBRANE TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Not only high energy consumption, but also a large amount of alkali, lignin and cellulose in

Method used

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Embodiment Construction

[0009] The cation exchange membrane diffusion dialyzer is an existing product, which has a water inlet for distilled water or purified water to flow in, a water outlet for distilled water or purified water to flow out, a liquid inlet for papermaking black liquor to flow in, and an outlet for papermaking black liquor to flow out liquid port; its interior is divided into multiple water passage chambers and liquid passage chambers by a number of cation exchange membranes and partitions; one end of the water passage chamber is connected to the water inlet, and the other end of the water passage chamber is connected to the outlet. The water port is connected; one end of the liquid passing chamber is connected with the liquid inlet, and the other end of the liquid passing chamber is connected with the liquid outlet.

[0010] The papermaking black liquor is firstly filtered to remove most of the solids, and then ultrafiltration is used to further remove the smaller solids, and then th...

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Abstract

The invention discloses an alkali recovery process for paper-making black liquid. The alkali recovery process for the paper-making black liquid comprises the following steps: filtering the paper-making black liquid to remove solid impurities; allowing the paper-making black liquid and water to flow through an inner cavity of a cation exchange membrane diffusion dialyzer; and controlling the flow rate of the paper-making black liquid and the water, so that the NaOH content of the paper-making liquid flowing out of the cation exchange membrane diffusion dialyzer is 25 to 35 g/L. The process is low in energy consumption, high in efficiency and low in environmental pollution, and can bring the benefits of saving resources and reducing the production cost.

Description

technical field [0001] The invention relates to an alkali recovery process for papermaking black liquor. Background technique [0002] The wastewater produced in the papermaking process is commonly known as papermaking black liquor, which contains a large amount of lignin, cellulose and considerable chemical raw materials. At present, the commonly used treatment method is to evaporate and concentrate the papermaking black liquor, and then burn it. Not only the energy consumption is high, but also a large amount of alkali, lignin and cellulose in the papermaking black liquor cannot be recovered, resulting in a great waste of raw materials. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a process for recovering alkali in papermaking black liquor. [0004] In order to solve the above-mentioned technical problems, the technical scheme of the alkali recovery process of the papermaking black liquor provided by the p...

Claims

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Application Information

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IPC IPC(8): D21C11/04
Inventor 娄玉峰张伟华李晓玉郝润清王丹
Owner SHANDONG TIANWEI MEMBRANE TECH
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