Production of ultra pure salt

Details Production of ultra pure salt Production of ultra pure salt

2006-05-02

2006-05-02

Nguyen, Ngoc-Yen (Department: 1754)

Chemistry of inorganic compounds

Halogen or compound thereof

Binary compound containing metal

C423S499500, C423S499100, C423S184000, C423S197000, C423S220000

Reexamination Certificate

active

07037481

ABSTRACT:
This invention relates to methods and installations for producing ultra pure sodium chloride salt crystals primarily for use in saturating depleted brine resulting from the electrolytic decomposition of saturated brine in chlor alkali membrane cells for the production of chlorine, caustic soda and hydrogen. More particularly, this invention relates to the production of ultra pure sodium chloride salt crystals by processing primary treated brine by first acidifying the primary treated brine, then stripping the carbonic acid produced by acidification as carbon dioxide, and then returning the brine to a pH of about 6 or higher which is sufficient for processing it in evaporation equipment where the ultra pure salt crystals are produced.

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T.F.O'Brine COntrol Of Sulfates In Membrane System, pp. 326-349.
Lawrence F. Becnel, Jr. PE,Use of a close coupled Brine Evap-ration System for salt supply to a Alkali Plant Oct. 11, 2000.
Lawrence F.Becnel,Jr. PE usa of a closed couple Brine Evaporation system for Salt supply to a membrane Chlor Alkali Plant Oct. 9, 2001.

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