Hydrogen enriched water swellable clay having reduced acid demand and stable at low pH
US4514510A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1983 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Sep 8, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B33/405
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A water swellable clay i.e. bentonite, hectorite, saponite or mixtures thereof, is slurried in water and contacted with a hydrogen ion exchange resin to replace a portion of the exchangeable sodium and other exchangeable cations with hydrogen, resulting in a hydrogen enriched, water swellable clay. It has been found that even the very low grade water swellable clays can be treated with the hydrogen ion exchange resin to provide a hydrogen enriched clay having reduced acid demand. The resulting clays have reduced acid demand for mixture in forming Magnesium Aluminum Silicate meeting specifications. Further, the resulting hydrogen enriched clay will not substantially flocculate or settle out of suspension in suspensions having a pH below about 6.0 and generally are useful in a suspension having a pH of about 2.0 to about 5.0 or about 2.0 to about 5.5 so that the modified clay can be used effectively as a suspending agent and as a viscosity modifying agent in water containing suspensions having a low pH.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.