Process for the production of hydrogen sulphide from elemental sulphur and use thereof in heavy metal recovery
US6852305B2 · kind B2 · utility
5Cited by
16References
14Claims
0Family size
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Key dates
| Filing date | Nov 25, 2003 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Nov 25, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/17
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process is provided for the production of hydrogen sulphide from the bacterial reduction of a mixture of a liquid and elemental sulfur with an electron donor, such as hydrogen gas, carbon monoxide or organic compounds. The bacteria may be Desulforomonas sp. (mesophilic), Desulfotomaculum KT7 (thermophilic), etc. The liquid/sulfur mixture is at a pH ranging from 5 to 9, and the liquid/sulfur mixture contacts the bacteria at a hydraulic retention time of at least 1 day. The hydrogen sulphide is stripped from the liquid medium to produce a gas containing at least 1 volume percent hydrogen sulphide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.