Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkali metal
Patent
1977-11-25
1979-12-25
Gartz, Delbert E.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkali metal
23302T, 423199, 423481, C01D 306
Patent
active
041805470
ABSTRACT:
A continuous process for the recovery of chemicals in saline water including the steps of converting the sulfates in the saline water feed to sodium sulfate; separating and recovering in the oxide forms essentially all of the magnesium and calcium from the saline water feed; then preparing a sodium chloride fortified solution by mixing the feed with recycled sodium chloride; crystallizing and re-crystallizing and then separating sodium chloride crystals, preferably in two evaporative crystallization processes; stripping bromine from the sodium chloride depleted solution; crystallizing and then separating sodium chloride and sodium sulfate crystals from each other and then from solution; recycling the separated sodium chloride to the first sodium chloride crystallization step; separating residual sulfates from the solution; crystallizing and then separating sodium chloride crystals; recycling the separated sodium chloride to the first sodium chloride crystallization step; crystallizing and then separating potassium chloride from the solution; and recycling the resulting solution to the last sodium chloride crystallization step. Substantial quantities of potable water are produced by the process. In a preferred embodiment, sodium chloride is electrolytically converted to sodium hydroxide, chlorine and hydrogen. Part of the sodium hydroxide is used in the process, the remainder is concentrated and flaked. Part of the chlorine is liquified, the remainder is combined with a portion of the hydrogen to form hydrochloric acid. Finally, the steam boiler flue gas may be combined with sodium hydroxide to produce the sodium carbonate used in the process.
REFERENCES:
patent: 1435524 (1922-11-01), Huber
patent: 1922283 (1933-08-01), Dering
patent: 1937995 (1933-12-01), Thomsen
patent: 3163599 (1964-12-01), Salutsky et al.
"By-Products from Saline Water Conversion Plants--A Feasibility Study" by American Cyanamid Company, for Office of Saline Water, United States Department of the Interior, Research and Development Progress Report No. 110, Sep. 1974.
"A Feasibility Study of the Utilization of Waste Brines from Desalination Plants, Part I," J. J. Christensen et al, for the _Office of Saline Water, United States Department of the Interior, Research and Development Report No. 245, Apr. 1967.
Ecodyne
Gartz Delbert E.
Langel Wayne A.
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