PRODUCTION PROCESS OF COMPOSITE FIBER BASED ON HYDROLYSIS LIGNIN WITH POLYACRYLONITRIL Russian patent published in 2017 - IPC C08L97/00 D01F6/54 D01F8/00 

FIELD: technological processes.

SUBSTANCE: invention relates to the production of sorbents having a well-developed microporous structure, controlled pore size and strength characteristics sufficient for use as sorbents made from activated carbon fibers obtained from polyacrylonitrile with the highest content of hydrolytic lignin. A method for producing a composite fiber based on hydrolytic lignin with polyacrylonitrile obtained by wet spinning with forcing-through the spinneret holes of mixtures of hydrolytic lignin and polyacrylonitrile solutions in dimethylsulfoxide in which the amount of hydrolysing lignin is from 70 to 80 wt % is fed into a precipitation bath with distilled water for coagulation of a polymer composite solution in the form of a fiber in which subsequent carbonization is carried out under nitrogen and activation by chemical reaction, and the composite fiber is subjected to an additional orientation stretching by 5-10% during the coagulation step in the precipitation bath, with the formation of micropores after carbonization with a monodisperse distribution of 3-18 mcm with channels having a regular combination of outer and closed pores of an elongated shape with expansion from the center of the fiber to its outer surface and anisotropic orientation along the entire length of the composite fiber.

EFFECT: composite fiber with sorption properties is obtained.

1 dwg, 1 tbl, 5 ex