B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
204/98.03
B01J 19/08 (2006.01) B01D 61/44 (2006.01) C25B 1/14 (2006.01) C25B 1/16 (2006.01) C25B 1/22 (2006.01) D01F 13/02 (2006.01)
Patent
CA 1214749
ABSTRACT ELECTRODIALYTIC WATER SPLITTING PROCESS AND APPARATUS FOR CONVERSION OF ALKALI METAL SULFATE VALUES DERIVED FROM SPENT RAYON SPIN BATHS _ A process and apparatus for converting alkali metal sulfate values such as sodium or potassium sulfate values in spent rayon spin bath liquors, into alkali metal hydroxide and alkali metal sulfate/sulfuric acid by using two- or three-compartment electrodialytic water splitter cells. The process and apparatus incorporate the features of: (a) feeding a liquid comprising water to the base compartment of an electrodialytic water splitter; (b) feeding a liquid comprising alkali metal sulfate values to the remaining compartments of the electrodialytic water splitter; (c) passing current through said electrodialytic water splitter to produce a liquid comprising alkali metal sulfate and sulfuric acid in one of the remaining compartments and a liquid comprising alkali metal hydroxide in said base compartment comprising. The liquid fed to the acid compartments of two- and three-compartment cells may contain H2SO4. When more than about 5 weight percent H2SO4 is present in the alkali metal sulfate solution to be fed to the acid compartment, use of three-compartment water splitter is preferred. Improved results are obtained when the compartments of the two- and three- compartment water splitter are maintained at a temperature of at least 40°C.
429254
Chlanda Frederick P.
Mani Krishnamurthy N.
Allied Corporation
Osler Hoskin & Harcourt Llp
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