Recovery of chemical components of cellulosic regenerating solut

Details Recovery of chemical components of cellulosic regenerating solut Recovery of chemical components of cellulosic regenerating solut

1976-08-18

1978-04-04

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With chemical reaction

203 29, 203 36, 203 37, 203 38, 203 80, 106168, 106311, 260561A, 260643A, 423400, 536 38, B01D 334, C08B 504, C08B 512

Patent

active

040826171

ABSTRACT:
Recovery of the chemical components of a cellulosic organic solvent regenerating solution containing a dialkylacylamide, a lower aliphatic monohydric alcohol, 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 to the alcohol and nitrous acid, neutralizing the nitric and nitrous acid with an alkali or alkaline earth metal oxide or 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 nitrate salts are converted by pyrolysis to nitrogen dioxide. The process results in substantially total recovery of the process chemicals.

REFERENCES:
patent: 1845665 (1932-02-01), Isham
patent: 2080064 (1937-05-01), Roelfsema
patent: 2233959 (1941-03-01), Plansoen
patent: 2696508 (1954-11-01), Wilson
patent: 3236669 (1966-02-01), Williams
patent: 3294651 (1966-12-01), Pasin
patent: 3557207 (1971-01-01), Hammond
patent: 3702843 (1972-11-01), Schweiger
patent: 3929586 (1975-12-01), Slikkers
patent: 3959371 (1976-05-01), Gavlin
Venkateswaren et al., Journal of Applied Polymer Science, vol. 18, 1974, pp. 133-142.

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