New Technology Using Minute Bubbles for Crystallization of Sodium Chloride

来源 :The 6th Joint China-Japan Chemical Engineering Symposium(第六届 | 被引量 : 0次 | 上传用户:lidandanlidd12141
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  New technology to perform cooling crystallization accompanying a supply of minute bubbles was developed.Nitrogen (N2) minute bubbles are supplied continually into a saturated sodium chloride (NaCl) solution, and the supplying effect of N2 minute bubbles on cooling crystallization phenomena of NaCl was investigated.N2 minute bubbles were generated using self-supporting bubble generator equipped with semi-batch type cooling crystallizer.An average bubble size (dbbl) was controlled by the change of shaft rotation speed under the condition that the molar feed rate of N2 was constant.When the saturated NaCl solution was cooled down at a constant cooling rate, the induction period of NaCl crystallization was reduced owing to the supplying N2 minute bubbles compared with non-supplying crystallization, which indicates that the crystallization temperature was rising and nucleation rate was accelerated with a residence of N2 minute bubbles.Furthermore, the consecutive supply of N2 minute bubbles shows an inhibiting tendency of agglomeration among NaCl crystals.
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