Process for preparing crystals of anhydrous sodium sulfide

Details Process for preparing crystals of anhydrous sodium sulfide Process for preparing crystals of anhydrous sodium sulfide

1991-01-23

1991-12-10

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Binary compound

23302T, C01B 1722

Patent

active

050716328

ABSTRACT:
Disclosed is a process for preparing crystals of anhydrous sodium sulfide, the process being characterized in that the process comprises the steps of heating a water-containing non-crystalline sodium sulfide at a temperature of about 30.degree. to about 89.degree. C. under a pressure of about 500 torr or less for about 2 hours or longer in a first-stage heating step and further heating the sodium sulfide at a temperature of about 90.degree. to about 200.degree. C. under atmospheric pressure or reduced pressure for about 2 hours or longer in a second-stage heating step.

REFERENCES:
patent: 1843767 (1932-02-01), Heath
patent: 1946089 (1934-02-01), Mayers
patent: 2533163 (1950-12-01), Copes et al.
Chemical Abstracts, 86:123811y (1977).
Chemical Abstracts, p. 1939, Abstract No. 5606(6), Columbus, Ohio, US; B. P. Ershov et al.: "Obtaining Chemically Pure Sodium Sulfide. Preliminary Communications", & J. Chem. Ind. 16, No. 2, 48-50 (1939) *Abstract*.
Chemical Abstracts, vol. 78, No. 22, Jun. 4, 1973, p. 137, Abstract No. 138433k, Columbus, Ohio, US; & SU-A-363 658 (Institute of Metallurgy and Ore Beneficiation, Academy of Sciences, Kazakh S. S. R.) 25-12-1972.
Chemical Abstracts, vol. 68, No. 24, 1968, p. 10483, Abstract No. 108432k, Columbus, Ohio, US; N. I. Kopylov: "Sodium Sulfide-Water System and Thermal Dehydration of Na2S.9H20", & Zh. Neorg. Khim. 13(2), 529-532 (1968) *Abstract*.
J. Chem. Soc. Dalton Trans., No. 3, 1986, pp. 469-475; J. Y. Andersson et al.: "Mechanisms and Kinetics of the Thermal Decomposition of Sodium Sulphide Pentahydrate Under Controlled Water Vapor Pressure".

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