Process for regenerating spent acid-activated bentonite clays and smectite catalysts
US5468701A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | May 23, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/3475
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A three step process for regenerating spent bleaching clays and acid-activated smectite catalyst granules includes: (1) an extraction step to remove a majority of entrained oil, preferably about 75% to about 95% by weight of the entrained oil, when regenerating bleaching clays; (2) an oxidation step to remove the majority of remaining carbonaceous adsorbates which are not removed by the preceding extraction step, and (3) an acid wash step to restore the acidity normally associated with fresh acid-activated bleaching clays. The features of steps 2 and 3 may be combined into a single step by using an appropriate oxidant, for example, a source of acidic protons, such as peracetic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.