Process for making acid activated bleaching earth using high susceptibility source clay and novel bleaching earth product
US5008226A · kind A · utility
23Cited by
7References
25Claims
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 certain naturally occurring mixtures of calcium bentonite and attapulgite clay. 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.