Chemistry of inorganic compounds – Nitrogen or compound thereof – Oxygen containing
Patent
1975-06-20
1976-06-22
Thomas, Earl C.
Chemistry of inorganic compounds
Nitrogen or compound thereof
Oxygen containing
423499, 23296, 23302R, 23303, C01B 2150
Patent
active
039652475
ABSTRACT:
According to the present invention, sodium nitrite is recovered from an aqueous solution containing dissolved sodium nitrite and sodium chloride by a process which comprises subjecting said solution to crystallization in a first crystallization zone under conditions sufficient to effect crystallization of sodium chloride, including operating at temperatures of from about 110.degree. to 130.degree.C, to produce a first slurry containing sodium chloride crystals; separating said crystals from said first slurry to produce a solution containing dissolved sodium nitrite; subjecting said sodium nitrite solution to crystallization in a second crystallization zone under conditions sufficient to effect crystallization of sodium nitrite from said solution, including operating at temperatures of from about 10.degree. to 60.degree.C, to form a second slurry containing sodium nitrite crystals; and recovering said sodium nitrite crystals from said second slurry.
REFERENCES:
patent: 910530 (1909-01-01), Halvorsen
patent: 991356 (1911-05-01), Pauling
patent: 2032699 (1936-03-01), Hayes et al.
Crook Donald Edward
Hecklinger Clarence Frederick
Allied Chemical Corporation
Fuchs Gerhard H,.
Murray, Jr. Jack B.
Thomas Earl C.
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