METHOD OF OBTAINING CELLULOSE NITRATES Russian patent published in 2008 - IPC C08B5/02 C08B5/06 

FIELD: chemistry.

SUBSTANCE: invention pertains to the technology of production of cellulose nitrates and can be used when producing them using continuous and combined technologies. The method involves preliminary and final nitration of cellulose with subsequent recovery of acid. Final nitration of squeezed out and partially nitrated cellulose is done in a centrifuge through short-time flowing-irrigative treatment with a nitrating mixture in the field of centrifugal forces. As the nitrating mixture a fresh nitrating acidic mixture or concentrated nitric acid used is. After final nitration, the nitro-mass is squeezed from the acid to moisture of 45-60 mass % and is taken for desaturation in a "НУОК" apparatus directly in form of squeezed nitro-mass or in form of acid with 5-12% suspension. For dilution of the nitro-mass and its transportation, the more concentrated fraction of acid, desaturated in the "НУОК" apparatus, is used. Desaturation of acid in the "НУОК" apparatus is done with extra use of flowing etherification zones of the apparatus.

EFFECT: design of a highly productive method of obtaining cellulose nitrates.

4 cl, 1 tbl, 15 ex