Process to prepare salt

Details Process to prepare salt Process to prepare salt

2006-02-13

2011-10-18

Drodge, Joseph (Department: 1778)

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

C210S644000, C210S651000, C210S805000, C423S499400, C423S499500

Reexamination Certificate

active

08038883

ABSTRACT:
The present invention relates to a process to prepare salt comprising the following steps: (i) preparing an aqueous salt solution containing at least 100 g/l of sodium chloride and at least 0.01 ppm of polyvalent cations by dissolving a sodium chloride source in industrial water, (ii) adding an effective amount of at least one positive retention enhancing component to the aqueous salt solution, (iii) subsequently subjecting the solution to a nanofiltration step, thereby separating the solution into a retentate which is enriched for the polyvalent cations and a permeate which is the purified aqueous salt solution, and (iv) concentrating the permeate to produce salt.

REFERENCES:
patent: 3419492 (1968-12-01), Bloch
patent: 3578589 (1971-05-01), Hwa et al.
patent: 3619424 (1971-11-01), Blanchard et al.
patent: 4038365 (1977-07-01), Patil et al.
patent: 4156645 (1979-05-01), Bray
patent: 4176022 (1979-11-01), Darlington
patent: 4303624 (1981-12-01), Dotson et al.
patent: 4911844 (1990-03-01), Linder et al.
patent: 5158683 (1992-10-01), Lin
patent: 5254257 (1993-10-01), Brigano et al.
patent: 5256303 (1993-10-01), Zeiher et al.
patent: 5458781 (1995-10-01), Lin
patent: 5858240 (1999-01-01), Twardwoski et al.
patent: 6004464 (1999-12-01), Lien et al.
patent: 6036867 (2000-03-01), Jogand et al.
patent: 6331236 (2001-12-01), Mani
patent: 7083730 (2006-08-01), Davis
patent: 7459088 (2008-12-01), Davis
patent: 2003/0000897 (2003-01-01), Mayers
patent: 2003/0049197 (2003-03-01), Mayers
patent: 2003/0205526 (2003-11-01), Vuong
patent: 2004/0055955 (2004-03-01), Davis
patent: 2006/0157410 (2006-07-01), Hassan
patent: 33 38 194 (1985-05-01), None
patent: 1 202 931 (2002-05-01), None
patent: 2 395 946 (2004-06-01), None
patent: 2101-887 (1985-10-01), None
patent: 96/33005 (1996-10-01), None
patent: 02/102713 (2002-12-01), None
patent: 03/006377 (2003-01-01), None
patent: 03/031033 (2003-04-01), None
patent: 2004/096404 (2004-11-01), None
patent: 01/04052 (2007-01-01), None
Saline Lakes, The largest, highest & lowest lakes of the world!, Soil & Water Conservation Society of Metro Halifax (SWCSMH), Nova Scotia, Canada, Jan. 5, 2006, downloaded from the internet on Feb. 18, 2011.
Elsevier Publishing Company,Chlor-Alkali Industry, pp. 92-96, (1971).
Pletcher, D., et al., “Sodium Chlorate and Sodium Bromate,”Industrial Electrochemistry, 2ndEd., pp. 269-273, (1990).
International Search Report, International Application No. PCT/EP2006/050869, mailed Apr. 5, 2006.
International Preliminary Report on Patentability and Written Opinion, International Application No. PCT/EP2006/050869, Feb. 19, 2007.
Jian-xin Ren, “Membrane Separation Technology and Application Thereof,” 1stEdition, Chemical Industry Publishing House, Jan. 2003, p. 13, (English-language translation of Chinese document).
Ding-yi Yu et al., Membrane Separation Engineering and Typical Examples of Design, 1stEdition, Chemical Industry Publishing House, Jan. 2005, pp. 174-179, (English-language translation of Chinese document).
International Search Report, International Application No. PCT/EP2006/050870, mailed May 2, 2006.
International Preliminary Report on Patentability and Written Opinion, International Application No. PCT/EP2006/050870, Jun. 1, 2007.

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