METHOD OF POLYMER SEPARATION FROM SOLUTION IN FORMATION OF PAN-PRECURSOR FOR OBTAINING CARBON FIBRES Russian patent published in 2015 - IPC D01D5/00 D01F6/18 B01D43/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a technology of obtaining fibres from polymers based on polyacrylonitrile-polyacrylonitrile (PAN) and acrylonitrile (AN) copolymers, namely to a stage of a polymer separation from a solution, and can be applied in the production of materials for the textile industry and precursors for obtaining highly strong carbon fibre of a novel quality, applied in different fields of technology. The method of separating the polyacrylonitrile-based polymer from 15-22 vol% solution in the formation of a PAN-precursor for obtaining the carbon fibres includes the extraction of the polymer from its solution without the application of precipitators and the following removal of a solvent by the ventilation of the fibre by air jet. Separation of the polymer from the solution is realised under an influence of mechanical tensions at a temperature of 150°C lower than the temperature of the solvent boiling, with 8-12-time extraction until the freshly formed fibre, with a residual content of the solvent not more than 1%, is obtained.

EFFECT: considerable acceleration of the fibre formation, sharp simplification and acceleration of the polymer separation process, exclusion of a necessity of a multi-stage extraction of the fibre, simplification of the solvent regeneration process.

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