Purification of water

Details Purification of water Purification of water

2011-01-18

2011-01-18

Barry, Chester T (Department: 1797)

Liquid purification or separation

Processes

Ion exchange or selective sorption

C210S687000

Reexamination Certificate

active

07871523

ABSTRACT:
A process for providing water with a lowered salinity and which produces at least one recoverable waste stream containing a useful by-product, the process including treating raw water which includes an undesirably high concentration of cations, including Ca2+and Na+, in a cation exchange stage which includes first and second cation exchangers. The first cation exchanger having a selectivity towards di-valent cations and the second cation exchanger being downstream of the first cation exchanger, to retain at least a portion of the cations of the raw water in or on the first and second cation exchangers, thereby providing upgraded water of a lowered salinity containing no or a low concentration of the cations of the raw water. The process further includes from time to time, regenerating the first cation exchanger with an acid to produce a first recoverable waste stream which includes a calcium salt and removing Na+from the second cation exchanger to produce a second recoverable waste stream which includes a sodium compound, and then regenerating the second cation exchanger.

REFERENCES:
patent: 6716344 (2004-04-01), Bassi et al.
patent: 2004/0226890 (2004-11-01), Bassi et al.
patent: 2001070989 (2001-03-01), None
patent: 2 104 969 (1998-02-01), None
patent: 2104969 (1998-02-01), None
PCT International Preliminary Report for International App. No. PCT/IB2006/051530, dated Apr. 22, 2008.
PCT Written Opinion for International App. No. PCT/IB2006/051530, dated Nov. 3, 2006.
PCT International Search Report for International App. No. PCT/IB2006/051530, dated Nov. 3, 2006.
Derwent Abstract Accession No. 98-465680/40 regarding RU 2 104 969, Published by Derwent, Feb. 20, 1998, 2 pages.
Derwent Abstract Accession No. 2001-321226/34 regarding JP 2001070989, Published by Derwent, Mar. 21, 2001, 3 pages.

Affiliated with

Also associated with

Rating

Purification of water does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Purification of water, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Purification of water will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2664185