METHOD FOR SEPARATION AND PURIFICATION OF SUBSTANCE BY CRYSTALLIZATION FROM MOLTEN SOLUTION UNDER PRESSURE

PURPOSE: To cause sweating and to separate and remove a sweat oil by pressurizing a melt under an atmosphere of inert gas, cooling the melt to be crystallized, separating the residual melt from the crystal and finally degassing the crystal by reducing the pressure. CONSTITUTION: An inert gas is intr...

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Hauptverfasser:	JIIKUBERUTO RITSUTONAA, RUDORUFU SHIYUTAINAA, AKUSERU KEENIHI
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE: To cause sweating and to separate and remove a sweat oil by pressurizing a melt under an atmosphere of inert gas, cooling the melt to be crystallized, separating the residual melt from the crystal and finally degassing the crystal by reducing the pressure. CONSTITUTION: An inert gas is introduced into a melt which is pressurized to a 100-5000 bar pressure under an atmosphere of inert gas, and then the melt is cooled to be crystallized. After the residual melt is separated from the crystal, the crystal is degassed by reducing the pressure. Suitable gases here are those which are soluble in the specific melt. For example, nitrogen, carbon dioxide, ethane, ethene, propane or mixtures thereof are suitable for naphthalene/biphenyl and p-/m-dichlorobenzene systems. The pressure of the gas can be gradually reduced after the residual melt is separated. Thereby sweat oil sweated out from the crystal is removed.