C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
204/98
C01B 31/24 (2006.01) B01D 61/44 (2006.01) C01B 17/74 (2006.01) C01D 7/02 (2006.01)
Patent
CA 1222970
A MEMBRANE PROCESS FOR CONVERTING SODIUM SULFATE INTO SULFURIC ACID AND SODIUM CARBONATE ABSTRACT OF THE DISCLOSURE A system for converting sodium sulfate ore into chem- icals of which H2SO4 and Na2CO3 are examples, utilizing a membrane process, the basic electrodialysis cell of which is located, usually as a series of such cells, between cathode and anode comportments. Each cell constitutes a pair of cation permselective membranes between which a bi-polar membrane is disposed in spaced relationship thereto with the cation permselective face thereof confronting the cation permselective membrane and the anion permselective face thereof facing the other cation permselective membrane. The cation permselective membranes of adjacent cells are common to such adjacent cells. All of the cation permselec- tive faces of the bi-polar membranes face the cathode electrode and all of the anion permselective faces of the bi-polar membranes face the anode electrode. Each cell includes a base zone and an acid zone. Each acid zone is defined by a cation permselective membrane and the confronting cation permselective face of the bi-polar membrane and each base zone is defined by a cation permselective membrane and the confronting anion perm- selective face of the same bi-polar membrane. The acid zone is fed by a water solution of a sodium salt, for example Na2SO4 and Na2S and the base zone is fed by a saturated water solution of NaHCO3 or by a water solution of a mixture of NaHCO3 and Na2CO3 or by a mixture of a water solution of Na2CO3 and CO2 which reacts with the Na2CO3 to form NaHCO3. The feeding of these composite solutions to the different zones results in increased current efficiencies by removing free H+ ions from the acid zone and free OH- ions from the base zone. Thecathode and anode electrodes are disposed in respective compartments through which water solu- tions of NaOH circulate. The cell is part of a plant in which other treatments are performed.
460041
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Tejeda Alvaro R.
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