发明名称 |
PROCESS TO PRODUCE HYDROGEN AND/OR HEMIHYDRATE CALCIUM SULPHATE FROM CALCIUM SULPHITE |
摘要 |
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. |
申请公布号 |
AU7781791(A) |
申请公布日期 |
1991.12.10 |
申请号 |
AU19910077817 |
申请日期 |
1991.05.13 |
申请人 |
MATERIALS-CONCEPTS-RESEARCH LIMITED |
发明人 |
MURRY C. ROBINSON;DONALD WILFRID KIRK;RICHARD LINE HUMMEL |
分类号 |
C01F11/46;C25B1/02;C25B1/22;H01M8/06 |
主分类号 |
C01F11/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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