Disposal method of rectification residue from synthetic leather production

Abstract

The invention relates to a disposal method for rectification residues in production of synthetic leather. The disposal method comprises the following steps: putting rectification residues in a reaction tank, adding clean water and stirring uniformly to enable N,N-dimethylformamide in the rectification residues to be fully dissolved in water; adding an alkaline solution and washing; stirring to decompose the rectification residues to form turbid liquid containing residues and water, adding a sulfuric acid solution and performing homogenization reaction; then adding aluminum chloride and a cationic macromolecular flocculant, and stirring to precipitate the turbid liquid containing residues so as to achieve layering of solid phase and liquid phase; purifying and concentrating the layered liquid phase to enable the concentration of N,N-dimethylformamide in the liquid phase to reach 20-30%, and performing rectification on the liquid phase; and adding quicklime powder to the layered solid phase, then dehydrating the product through a belt filter press, and preparing a mud cake from the dehydrated solid phase. The disposal method has many advantages of low disposal cost, energy conservation and environmental protection, capability of reusing the separated liquid phase and solid phase, and the like.

Description

【Technical field】 [0001] The invention relates to a disposal method of waste residue, in particular to a disposal method of rectification residue from synthetic leather production, and belongs to the technical field of environmental protection. 【Background technique】 [0002] The production and development of synthetic leather plays an extremely important role in the development of its industry. It replaces most of the unique functions of natural leather and provides infinite convenience for human daily production and life, as well as industrial production and other fields. . my country has now become the capital of synthetic leather production and processing in the world, with thousands of production lines and processing equipment. Production and processing have created huge social and economic benefits. At the same time, the pollution caused by the three wastes (waste gas, waste water, and waste residue) produced in the process of industrial development is becoming more a...

AI Technical Summary

Problems solved by technology

Although this solves part of the pollution problem, the process of incineration is also a process of increasing carbon emissions, and it also burns the recyclable resources in the residue and waste liquid: such as dimethylformamide (DMF for short), which is in line with the energy conservation advocated by the world The concept of emission reduction is opposite, and the treatment capacity of the incineration disposal method is extremely limited. A large amount of residue and waste liquid is still piled up like a mountain. In addition, the cost of incineration treatment is high, and the burden on the production enterprise is heavy. Enterprises try to secretly discharge and dump Phenomenon

A large amount of heat energy generated in the incineration process has not been utilized, and secondary pollution will also be generated

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