Condensate purification process by use of dilute clear lime solution
US4172783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1978 |
| Grant date | Oct 30, 1979 |
| Priority date | — |
| Expiry date | Mar 15, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J49/09
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
There is provided an improvement in the method of regenerating the anion portion of a mixed anion/cation exchange resin bed used for purification of condensate water. The improvement comprises utilizing a clear dilute lime solution substantially free of non-hydroxylic anions. This solution is produced by passing a solution of calcium salt through a strong base anion exchanger in the hydroxyl form, and thus producing calcium hydroxide by salt splitting. The spent resin is regenerated with spent caustic regenerant from a condensate purification process or with fresh caustic. It is preferred that the calcium solution and the regenerant enter the ion exchanger in counterflow pattern to minimize leakage of non-hydroxy ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.