METHOD FOR PRODUCING CARBON NON-WOVEN FIBROUS FABRIC FROM HYDRATED CELLULOSE FIBERS Russian patent published in 2023 - IPC D01F9/16 

FIELD: carbon production.

SUBSTANCE: production of carbon fiber materials from the original cellulosic fibrous raw material. The method for producing a carbon fiber nonwoven fabric from hydrated cellulose fibers includes treatment of catalyst components in a mixed solution, treatment with microwave ultrahigh frequency irradiation and multi-stage carbonization with increasing heating in each subsequent stage. Also, multi-stage cooling of the material between the stages of heating in air and graphitization when heated in an inert medium are carried out. At the same time, the original non-woven fabric is treated in an aqueous solution of carbonization catalyst compounds containing ammonium chloride and ammonium hydroorthophosphate by dipping impregnation. At the exit from the solution, it is dehydrated to a wet weight gain of 130-170% of the mass. Multi-stage cooling during multi-stage carbonization is carried out starting from the third stage, and the volatile products removed from the graphitization chamber in the direction opposite to the direction of transportation of the graphitized fabric are calcined in an open flame directly at the outlet of the opening for removing them from the graphitization chamber, while the partially carbonized fabric is introduced into the graphitization chamber through the flame of combustion of volatile products of the graphitization chamber.

EFFECT: efficient and productive preparation of the original hydrated cellulose fabric for thermochemical transformation into a carbon non-woven fiber at the carbonization stage; stable course of the carbonization process and obtaining a high-quality carbonaceous precursor of a graphitized non-woven fabric; intensification of the process of carbonization of hydrated cellulose fiber; separating the pyrolysis of the fabric during carbonization into separate thermal degradation reactions occurring at specific temperatures of the staged heating, and reducing simultaneously occurring reactions at a particular stage of heating; the stability of the carbonization process and the improvement of the properties of the carbonized non-woven fabric as a precursor of the high-performance graphitized non-woven fabric obtained from it; reducing the negative impact of the presence of volatile products on the emerging non-woven fabric; the possibility of obtaining a non-woven fibrous carbon fabric without reject due to the presence of burnouts.

1 cl, 4 ex