Process and apparatus for wet treatment of vent gas
US4002722A · kind A · utility
24Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1975 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Mar 12, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/46
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Vent gas containing disagreeable odor components consisting mainly of phenolic substances evolving from foundries using shell molding sand containing phenol resin as a binder is efficiently wet-treated by scrubbing the vent gas with an aqueous absorbent solution, to which a ferrous salt and hydrogen peroxide are added so that a ferrous ion concentration may be at least one-seventh of a hydrogen peroxide concentration, thereby making an oxidation-reduction potential of the aqueous absorbent solution have at least a value of (540 - 60 .times. PH value) mV, wherein the PH value is 5 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.