Treatment of spent refinery caustic
US5434329A · kind A · utility
5Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Jun 25, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C7/14841
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A hydrocarbon stream is washed with caustic solution to reactively remove hydrogen sulfide and produce a spent caustic solution containing sulfide reaction products. The spent caustic solution is stripped with concentrated carbon dioxide to reactively remove the sulfides and produce an overhead hydrogen sulfide stream and a bicarbonate-containing bottoms stream. The hydrogen sulfide stream can be converted to elemental sulfur in a Claus unit or to sulfuric acid in a sulfuric acid plant. The bicarbonate solution can be washed with liquid hydrocarbon to remove mercaptans and phenols in further preparation for disposal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.