Process to produce hydrogen and/or hemihydrate calcium sulphate

Details Process to produce hydrogen and/or hemihydrate calcium sulphate Process to produce hydrogen and/or hemihydrate calcium sulphate

1993-08-18

1995-10-17

Gorgos, Kathryn

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423166, 42324308, 42324309, 423555, 204129, C25B 122, C01F 1146

Patent

active

054587441

ABSTRACT:
A process for producing hydrogen and/or hemihydrate calcium sulphate from calcium sulphite. Waste solid containing calcium sulphite and other calcium salts is treated by the addition of aqueous sulphur dioxide solution or sulphuric acid solution to produce a liquid phase product. The liquid phase product may be separated from any remaining solid phase material and then subjected to the addition of sulphuric acid in a second step, wherein calcium sulphate hemihydrate is produced. The addition of sulphuric acid to the liquid phase results in the evolution of sulphur dioxide which may be used as such or in sulphur dioxide electrolysis cells in order to produce hydrogen and sulphuric acid. An especially unique feature of the process is that the sulphuric acid produced in generating hydrogen can be recycled to the step where the calcium sulphate crystals are produced.

REFERENCES:
patent: 3556722 (1971-01-01), Owaki
patent: 4069300 (1978-01-01), Akazawa
patent: 4976936 (1990-12-01), Rathi

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