Process for regeneration of volatile acids
US5500098A · kind A · utility
16Cited by
8References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1993 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Aug 5, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/01
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Volatile acids containing metal salt impurities, such as metal pickling solutions-are regenerated by a process in which the acid is subjected to sulfuric acid distillation. Resulting volatile acid vapor is condensed and recycled to the pickle tank, while the residual acid mixture is treated in an acid sorption unit, preferably of the acid retardation type. Acid sorbed in the acid sorption unit is periodically eluted with water and recycled, while metal impurities are rejected in a deacidified by-product solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.