| 摘要 |
PROBLEM TO BE SOLVED: To provide the operation method of a crystallizer capable of continuously and stably forming crystals in cooled crystallization operation and stabilizing the operation of a post-process to enhance production capacity. SOLUTION: In the operation method of the crystallizer wherein a crystallizing raw material is supplied to the flow channel on a process side of the crystallizer equipped with a cooler performing heat exchange through a heat transfer surface and a cooling medium is supplied to a cooling medium flow channel to perform crystallization, the heat transfer resistance Rp on the process side defined by the formula: Rp=1/h1 +rs1 +Cc+rs2 (wherein, h1 is the rate of heat transfer of a boundary film on the process side, rs1 is a surface contamination factor on the process side, Cc is the conductive heat transfer coefficient determined by the dimension and material of a heat transfer surface and rs2 is a surface contamination factor on a cooling medium side) is continuously monitored and the change of the value is set as an index to perform the alteration of the operation condition of the crystallizer, the changeover of the cooler and the alteration of the regeneration condition of the cooler.
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