Drowning-out crystallization of sodium molybdate in aqueous-ethanol solutions
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Published:2020
Issue:4
Volume:26
Page:395-399
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ISSN:1451-9372
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Container-title:Chemical Industry and Chemical Engineering Quarterly
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language:en
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Short-container-title:CI&CEQ
Author:
Casas Jesús1,
Lagos Josué1
Affiliation:
1. Universidad Técnica Federico Santa María, Valparaíso, Chile
Abstract
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.
Publisher
National Library of Serbia
Subject
General Chemical Engineering