Improved crystallization apparatus and method

B - Operations – Transporting – 01 – D

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B01D 9/00 (2006.01) C30B 7/00 (2006.01)

Patent

CA 2207918

A surface-cooled fluid bed crystallizer apparatus (10) and method are disclosed wherein submerged heat exchanger surfaces (typically heat exchanger tubes (14) or plates through which a coolant is passed) are bathed with a stream of gas bubbles (preferably air). The gas bubbles increase localized velocity at the heat exchanger surfaces, improves heat transfer, reduces crystallization on the heat exchanger surfaces and gently keeps the crystals in suspension, thereby avoiding unwanted nucleation as is characterized by the use of mechanical circulation devices. By continuously removing the depleted magma and crystals, the crystallizer (10) can be operated in a continuous mode.

La présente invention concerne un procédé de cristallisation (10) et un cristallisateur à lit fluidisé refroidi par l'intermédiaire de surfaces d'échangeurs thermiques (généralement des tubes (14) ou des plaques à l'intérieur desquels circule un liquide de refroidissement), immergés dans ledit cristallisateur, et plongés dans un courant de bulles de gaz (l'air, de préférence). Les bulles de gaz accroissent la vélocité localisée au niveau des surfaces des échangeurs thermiques, elle améliorent le transfert de chaleur, réduisent la cristallisation sur les surfaces des échangeurs thermiques et maintiennent en douceur les cristaux en suspension, ce qui permet d'éviter la formation de cristaux indésirables comme cela est le cas avec les dispositifs d'agitation mécanique. Le fait de pouvoir retirer, de façon continue, le plasma appauvri et les cristaux, permet une utilisation en mode continu du cristallisateur (10).

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