Equipment and production process for producing sodium lignosulfonate from papermaking wastewater

Abstract

The invention relates to equipment for producing sodium lignin sulfonate from paper-making sewage. The equipment comprises a paper-making waste liquid storage tank, wherein the paper-making waste liquid storage tank is connected to a molecular separation device; the macromolecule solute outlet of the molecular separation device is connected to a lignin collecting box; the micromolecule solute outlet of the molecular separation device is connected to a catch box; the lignin collecting box is connected to a dissolution and sulfonation device; the dissolution and sulfonation device is connected to a sodium lignin sulfonate generation device; the catch box is connected to a concrete additive preparation device. The invention further relates to a production process for producing sodium lignin sulfonate from paper-making sewage. The production process comprises the following steps: collecting waste water, separating and retaining, dissolving and sulfonating, generating, and preparing a concrete additive. The invention aims to provide equipment and the production process for producing sodium lignin sulfonate from paper-making sewage, pollution caused by separated paper-making waste water can be avoided, and meanwhile the separated paper-making waste water can be adopted to prepare the concrete additive for further use.

Description

technical field [0001] The invention relates to the utilization field of papermaking sewage, in particular to equipment and a production process for producing sodium lignosulfonate from papermaking sewage. Background technique [0002] A large amount of waste liquid will be produced in the process of papermaking and pulping, and papermaking waste liquid is a highly polluting liquid. If it is discharged directly, it will cause a high degree of environmental pollution. Therefore, it needs to be treated. Through years of analysis and research, papermaking wastewater It mainly contains a large amount of lignin, and lignin can be used to prepare sodium lignosulfonate, which in turn can be used to make dispersants. [0003] How to separate and utilize the lignin in the papermaking wastewater is the research direction of the industry. Now the more commonly used and mature technology is the chemical separation method, which uses the characteristics of lignin soluble in alkali and no...

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Problems solved by technology

[0003] How to separate and utilize the lignin in the papermaking wastewater is the research direction of the industry. Now the more commonly used and mature technology is the chemical separation method, which uses the characteristics of lignin soluble in alkali and not easy to acid, to the alkaline papermaking waste liquid Add an acidic solution to the papermaking waste liquid to separate out the lignin acid, then dissolve the separated lignin in an alkaline solution, and carry out sulfonation to obtain sodium lignosulfonate; use this acid precipitation process to separate Lignin has great defects. During the acid analysis process, a large amount of acidic liquid (called yellow liquid in the industry) will be produced. If it is discharged, it will also cause serious pollution to the environment and increase the load of water treatment.

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