Open AccessDrowning-out crystallization of sodium molybdate in aqueous-ethanol solutions
Author(s) -
J. Manuel Casas,
Josué Lagos
Publication year - 2020
Publication title -
chemical industry and chemical engineering quarterly
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.189
H-Index - 26
eISSN - 2217-7434
pISSN - 1451-9372
DOI - 10.2298/ciceq191029017c
Subject(s) - sodium molybdate , crystallization , molybdate , aqueous solution , sodium , ethanol , distillation , chemistry , hydrate , inorganic chemistry , materials science , chromatography , organic chemistry
The drowning-out crystallization process of sodium molybdate (Na2MoO4) was studied in water-ethanol solutions at room temperature. Sodium molybdate was separated from the solution in well-crystalline particles using less water and energy compared with the industrial processes that use evaporative crystallization. Results showed that crystallization of sodium molybdate di-hydrate was achieved after 20 or 40 min in one or two operating stages for super-saturation control with the addition of 25 or 50 vol.% ethanol, respectively. Crystallization with ethanol could reduce the operating costs for about 32% with respect to the conventional evaporative crystallization method, and the exhausted ethanol in the aqueous solution could be recovered by distillation and then recycled into the process.