Process for leaching particulate solid materials
US4824939A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1986 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Oct 9, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D11/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A novel leaching process for separating extractable material from a particulate solid material that comprises extractable and non-extractable portions includes the steps of introducing the particulate solid material and a liquid solvent to an extraction zone; agitating the liquid solvent to a degree sufficient to suspend the particulate solid material and effect segregation of particles thereof in relation to their propensity to settle; maintaining contact between the liquid solvent and the particulate solid material for a time sufficient to leach extractable material therefrom; and selectively withdrawing particles of the solid material from the extraction zone. In a preferred embodiment, the leaching process is a multi-stage process in which the selectively withdrawn particles from each stage are introduced to the next successive stage of the series. A particularly important use for the novel leaching process is in the recovery of gelatin from bone, and specifically in that step of the gelatin manufacturing process in which granulated bone is demineralized by contact with a dilute acid solution which converts bone particles to particles of ossein by extracting the minerals from t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.