RECOVERY OF AMMONIUM SULFATE FROM AMMONIUM SULFATE WASTE LIQUID FORMED AS BY-PRODUCT OF CAPROLACTAM PRODUCTION PROCESS

摘要

PURPOSE: To separate and recover purified ammonium sulfate from waste ammonium sulfate liquid produced as a byproduct of a caprolactam production process and containing large amount of organic or inorganic impurities. ;CONSTITUTION: Waste ammonium sulfate liquid produced as a byproduct of a caprolactam production process is concentrated to precipitate and separate crude ammonium sulfate, which is washed with methanol to obtain purified ammonium sulfate.;COPYRIGHT: (C)1994,JPO&Japio