METHOD AND DEVICE FOR CONTINUOUS CRYSTALLIZATION

PURPOSE:To shift the eutectic composition of an original system and to relatively easily separate and refine respective components with high purity at a low cost without intrusion of impurities by adding a third-component liquefied gas to the mixture of the eutectic multicomponent system as a solvent. CONSTITUTION:The multicomponent compd. as the raw material having a eutectic point is cooled to a first temp. slightly higher than the eutectic temp. to crystallize the first component (e.g. siloxane) which is recovered. A liquefied gas (e.g. liquefied propane) which is liq. at least at the operating temp. is added to the resulting mother liquor to cool the liquor to the second temp. slightly higher than the eutectic temp. after the liquefied gas is added, and the second component (e.g. benzene) is crystallized and recovered. The resulting mother liquor is separated into a liq. phase free of the liquefied gas and a gas phase contg. the liquefied gas. The separated liq. phase is circulated and mixed with the raw material supplied in the first component crystallization and recovery process, and the gas phase is circulated and mixed with the liquefied gas added in the second component crystallization and recovery process.