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New data are presented for assessment of the crystallization of potassium sulfate by drowning-out precipitation. The solubility of potassium sulfate in water, in aqueous alcohols, and In aqueous acetone has been determined over the temperature range 15-35 °C, and the densities of the resulting saturated solutions have been measured. In all cases, the presence of either alcohol or acetone significantly reduces both the solubility of potassium sulfate In aqueous solution and the density of its saturated solution. The solubility data may conveniently be expressed by a relationship of the form In (w^) = A + Bx + Cx2 with an accuracy =f2% where weq Is the equilibrium saturation concentration of potassium sulfate, expressed as kilograms of potassium sulfate per kilogram of water, and x is the concentration of precipitant expressed as kilograms of organic cosolvent per kilogram water.

Ind. Eng. Chem. Prod. Res. deamination reaction followed by a hydrogenation of butene(s) to give butane. Andreu, P.; Rosa-Brush, M.; Sanchez, C.; Nolier, H. Satterfield, C. N. Ind. Eng. Chem. Process Des. Dev. Giuskoter, H. J. Fuel 1965, 44, 285. 1976, 15, 272. D~v . 1086, 25, 657-664 657 Hogan, P.; Pasek, J. Collect. Czech. Chem. Comm. 1973, 38, 1513. Hogan, P.; Pasek. J. Collect. Czech. Chem. Comm. 1974, 39. 3696. Katzer, J. R.; Sivasubramanian, R. Catal. Rev.-Sci. Eng. 1979, 20, 155. Liu, K. H. D.; Hamrln, C. E., Jr. Ind. Eng. Chem. Process Des. Dev. 1983, Liu, K. H. D.; Johannes, A. H.; Hamrin, C. E., Jr. Fuel 1984, 63, 18. Lycourghiotis, A.; Katsanos, N. A.; Vattis, D. J. Chem. SOC., Faraday Trans. McIivrled, H. 0. Ind. Eng. Chem, Process Des. Dev. 1971, 10, 125. Pasek. J. Collect. Czech. Chem. Comm. 1963, 2 8 , 1007. Pasek. J.; Tyrpeki, J.; Machova, M. Collect. Czech. Chem. Comm. 1966, Sakata, Y.; Hamrln, C. E.. Jr. Fuel 1983, 62, 508. Satterfield, C. N.; Modell. M.; Hltes, R. A.; Declerck, C. J. Ind. Eng. Chem. Shih, S. S.; Katzer, J. R.; Kwart, H.; Stiles, A. B. Prep.-Am. Chem. Soc.,Redpitation of cocarboxylase hydrochloride from aqueous solution induced by addition of acetone was investigated. The corrected separation density concept, bulk density, the results of screening, and the electron microscope observations have been used to study the effect of the acetone addition rate, initial concentration, the amount of seeds, and the intensity of mixing on the quality of precipitate agglomerates. A set of experimentally verified optimum conditions for the process yielding the product of desired quality was established. Experimental SectionEquilibria. The knowledge of the solubility of a given substance is a prerequisite to investigate the crystallization. The solubility for the system CX-HC1-water-acetone a t 15 "C was determined in the following simple experiment. An acid solution of CX-HC1 and water of a known composition was placed in an Erlenmeyer flask, and a known Long-acting androgens are potentlaliy useful as male contraceptives and to maintain libido and potency under certain pathological conditions. This paper describes the synthesis of esters of testosterone with four bile acids as part of a World Health Organization Program for the synthesis and screening of potential longacting contraceptive agents. Two methods of esterification were fwnd to give optimum resutts of yield and purity of the final product: (a) reaction of the acid chloride with the thallium(1) salt of the steroidal alcohol and (b) reaction of the free acid with testosterone in the presence of 4-(dimethylamino)pyridine and dicyclohexylcarbodiimide.

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