A device and method for enrichment and separation of fluorine-containing polymer emulsion

Abstract

The invention relates to a device and method for enriching and separating fluorine-containing polymer emulsion. The device for enriching and separating fluorine-containing polymer emulsion comprises a lower end cover, a feeding pipe, a barrel, a discharge pipe, an upper end cover, an upper end cover shaft seal, a stirring blade, a stirring shaft, an air inlet pipe, a lower end cover shaft sleeve and a fastening component. The device can intensively stir the heated fluorine-containing polymer emulsion which is added with an electrolyte flocculant, hot air is introduced, gas-liquid-solid three-phase foam is formed, and enrichment and separation of fluorine-containing polymers are realized. Compared with the prior art, the device and method for enriching and separating the fluorine-containing polymer emulsion has the advantages that the enrichment and separation of the fluorine-containing polymer can be simply and efficiently completed with low consumption, a load of a subsequent separation process is greatly reduced, and enrichment ratio and recovery rate of solid-phase fluorine-containing polymer in emulsion are more than 98%.

Description

technical field [0001] The invention belongs to the technical field of liquid-solid separation, and in particular relates to a fluorine-containing polymer emulsion enrichment and separation device and method. Background technique [0002] As a high-performance special material, fluoropolymer has excellent high and low temperature resistance, chemical stability, good electrical insulation, non-adhesion, low friction, good lubricity, etc. It has been used in aerospace , atomic energy, petrochemical, machinery, electronics, construction, textiles, semiconductors, automobiles, medical equipment, office machines, household appliances, fuel cells, lithium batteries and other fields, and its use is still expanding rapidly. [0003] Most of the industrial production of fluoropolymers involves the liquid-solid separation process of fluoropolymer emulsions. As far as fluoropolymer emulsion is concerned, it belongs to a low-concentration, highly dispersed heterogeneous system, in whic...

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Problems solved by technology

At present, the separation process of fluorine-containing polymers mostly adopts the separation process of coagulation pretreatment combined with filtration. Coagulation is carried out first to increase the particle size of solid particles, and then the pressurized filter cake filtration separation operation is carried out. Due to the low concentration of fluorine-containing polymer emulsion, the particles have Compressibility, the resistance of the formed filter cake is very large. During the separation process, a large amount of liquid phase must pass through the filter cake layer to realize the separation of liquid and solid phases. The operation period is long, the operation energy consumption is large, the production efficiency is low, and intermittent operation. Poor process stability, resulting in high industrial production costs, has become a bottleneck problem for high-efficiency, low-consumption, and large-scale production of fluoropolymer industrial processes

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