Patent ID: 11857930
Assignee: JGC CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 18:
19. A crystallization apparatus comprising:
a treatment container where treatment for precipitating a crystal of a target substance is performed;
a porous membrane provided so as to internally partition the treatment container into a first flow space and a second flow space, multiple pores through which a liquid passes being formed in the porous membrane;
a raw material liquid supply unit continuously supplying the first flow space with a raw material liquid containing a raw material substance as a raw material of the target sub stance;
a treatment liquid supply unit continuously supplying a treatment liquid to the second flow space at a pressure at which the treatment liquid passes through the porous membrane and enters the first flow space, the treatment liquid being a reaction liquid generating a target substance lower in solubility with respect to the mixed liquid than the raw material substance by reacting with the raw material substance;
an extraction unit continuously extracting a mixed liquid of the raw material liquid and the treatment liquid from the first flow space; and
an aging unit precipitating and growing a crystal of the target substance from a mixed liquid extracted from the extraction unit; and
wherein the crystallization apparatus further comprises:
a gas-liquid separation unit provided at a position higher than the first flow space and the second flow space and including a container for collecting an air bubble brought in together with the raw material liquid or treatment liquid and separating the air bubble from a liquid;
a sensor unit detecting a height of an interface between a liquid and a gas pool formed by an air bubble being separated from a liquid in the gas-liquid separation unit; and
an exhaust unit discharging gas of the gas pool in a case where an interface height detected by the sensor unit is equal to or lower than a preset interface height.