COOLING CONCENTRATED, DIAPHRAGM CELL SODIUM HYDROXIDE SOLUTIONS
A cooling technique whereby a hot, concentrated, diaphragm cell sodium hydroxide solution coming from an evaporator is cooled and sodium chloride removed therefrom. The sodium hydroxide solution is contacted with a liquid refrigerant to cool the solution and precipitate the salt. The salt is separat...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A cooling technique whereby a hot, concentrated, diaphragm cell sodium hydroxide solution coming from an evaporator is cooled and sodium chloride removed therefrom. The sodium hydroxide solution is contacted with a liquid refrigerant to cool the solution and precipitate the salt. The salt is separated from the cooled solution. The liquid refrigerant can be recovered and recycled. Such method avoids the use of conventional tube heat exchangers which are periodically plugged by the salt precipitate. Also, the direct contact cooling method provides conditions for salt crystal growth thus making subsequent separation easier to accomplish. |
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