Recovery of chemical components of cellulosic regenerating...

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B01D 3/36 (2006.01) B01D 3/34 (2006.01) C08J 11/02 (2006.01)

Patent

CA 1097254

N. A. Portnoy-D.P. Anderson 6-1 RECOVERY OF CHEMICAL COMPONENTS OF CELLULOSIC REGENERATING SOLUTION Abstract of the Disclosure: Recovery of the chemical components of a cellulosic organic solvent regenerating solution containing a dialkyl- acylamide, a lower aliphatic monohydric alchol, a nitrite of the alcohol and nitric acid. The process comprises distilling the solution to remove the alcohol nitrite and alcohol, leaving the dialkylacylamide and nitric acid, recovering the alcohol, hydrolyzing to convert the alcohol nitrite e to the alcohol and nitrous acid, nertralizing the nitric and nitrous acid with an alkali or alkaline earth metal oxide ox hydroxide and distilling the solution to remove water and to separate and recover the remaining alcohol, the dialkylacylamide and the nitrate and nitrite salts. The nitrite and nitrite salts are converted by pyrolysis to nitrogen dioxide. The process results in sub- stantially total recovery of the process chemicals. - 1 -

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