Process for making acid activated bleaching earth using high susceptibility source clay and novel bleaching earth product
US5008227A · kind A · utility
12Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | May 16, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for making acid-activated bleaching earth from a crude attapulgite clay. A crude is selected which is mildly acidic and contains at least about 90% attapulgite. The process involves treating such clay with low levels of activating acid which are mixed with the dried and ground clay, or spray dried from slurries containing the clay-acid mixture. Advantages include: lower acid costs/unit mass of clay treated, lower production costs (no washing, filtering, or waste treatment steps) and environmental soundness (no harmful environmental waste products are produced).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.