| 摘要 |
FIELD: heat exchange.SUBSTANCE: invention relates to method for heat exchange using a mother solution a para-xylene (PX) crystallisation method. Method involves feeding a stream of incoming material and a stream of mother solution into a PX crystallisation apparatus, comprising a first heat exchanger to perform heat exchange through wall between stream of mother solution and a stream of incoming material and a crystallizer for crystallisation of PX from stream of supplied material, wherein stream of mother solution is cooled to temperature -50 °C providing a second heat exchanger for cooling stream of supplied material to reach PX crystallisation apparatus for cooling stream of supplied material with a second low-temperature energy source of cooling agent and providing a third heat exchanger to perform heat exchange through wall between stream of mother solution and a stream of incoming material before stream of supplied material enters second heat exchanger.EFFECT: invention provides improved process of low-temperature crystallisation and optimum use of cooling using heat exchange with a mother solution to reduce costs on cooling during crystallisation.7 cl, 2 dwg |
