A method for reusing synthetic leather rectification residue

Abstract

A related reutilizationoun method for synthetic leather rectification residue comprises the following steps: putting rectification residue in a reaction tank, adding clear water and stirring uniformly, so as to fully dissolve dimethyl formamide in the rectification residue in water; adding an alkaline solution and performing water washing; stirring and enabling the rectification residue to be decomposed into a suspension of residue and water, and then adding a sulfuric acid solution for homogenization reaction; then adding aluminium chloride and a high-molecular cationic flocculating agent and stirring, so as to enable the suspended residue to form a precipitate and realize layering of the solid phase and the liquid phase; performing purification and concentration on the layered liquid phase, enabling the concentration of dimethyl formamide in the liquid phase to reach 20-30%, and performing rectification on the liquid phase; and adding quicklime powder into the layered solid phase, performing dewatering processing by a belt type press-filtration dewaterer, and preparing a mud cake from the dewatered solid phase. The method has multiple advantages such as low processing cost, capability of respectively reutilizing the separated liquid phase and solid phase, energy saving, environment friendliness and the like.

Description

[0001] 【Technical field】 [0002] The invention relates to a method for disposing of industrial waste residues, in particular to a method for reusing synthetic leather rectification residues, and belongs to the technical field of environmental protection. [0003] 【Background technique】 [0004] 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 i...

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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