Plural stage freeze crystallization with wash-water/concentrate interface control
US3992900A · kind A · utility
16Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Dec 27, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D9/0059
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is directed to an apparatus and method of purifying contaminated water by means of a two-step freeze crystallization process. The method and apparatus overcomes the serious problem caused by the freezing of water on the screen of the wash column. The solution comprises means and method of reducing the temperature difference between the concentrate and the wash water in the wash column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.