Process for the treatment of phenol-containing waste water from coal degassing or gasification processes
US3972693A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1973 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Jun 6, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01C1/024
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Dissolved organic compounds in waste water resulting from coal degassing or gasification processes are removed by extraction with a solvent which is substantially water-immiscible, the solvent residues in the waste water are removed by inert gas scrubbing, and CO.sub.2, H.sub.2 S and NH.sub.3 in the waste water are removed by heating and steam contacting. NH.sub.3 is effectively removed in a steam gas/liquid contacting column by feeding the condensed head product of the column back to the top portion thereof, withdrawing a portion of the condensate from the column at a level intermediate the top and bottom portions of the column, treating the condensate in admixture with waste water containing CO.sub.2, H.sub.2 S and NH.sub.3 in a deacidification gas/liquid contacting column, and feeding the sump product of the deacidification column to the first column at a region below the region at which the condensate is withdrawn but intermediate the top and bottom portions of the NH.sub.3 -removal column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.