MANUFACTURING METHOD OF NAPHTHALENE, CAPABLE OF IMPROVING PRODUCTIVITY AND SIMPLIFYING THE MANUFACTURING PROCESS USING A MOLTEN AND SOLUTION CRYSTALLIZATION METHOD

摘要

PURPOSE: A manufacturing method of naphthalene is provided to reduce the excessive use of a solvent, to reduce the capacity of a filter and a centrifuge, and to obtain high purity of naphthalene even by a simple process.;CONSTITUTION: A manufacturing method of naphthalene comprises a step of separating tar oil from coal tar; a step of obtaining a first purified material by melting and crystallizing the separated tar oil; and a step of obtaining a second purified material by crystallizing the first purified material. The step of separating the tar oil is conducted until the content of the crude naphthalene in the tar oil is up to 35-60 wt%. The step of obtaining the first purified material is conducted by cooling at a rate of 0.01-2.0 K/min up to 30- (-10)°C and crystallizing.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Cortar; (BB) Distillation; (CC) Melting and crystallization; (DD) First purified material; (EE) Separate naphthalene; (FF) Solution crystallization; (GG) Separate naphthalene; (HH) High purity naphthalene