MELT-CRYSTALLIZATION SEPARATION AND PURIFICATION PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a method advantageous in safe operation of unit operations by improving the product recovery rate and the efficiency related to operating costs in purification of para-xylene.SOLUTION: The present invention relates to a method for separating para-xylene and molecular oxygen from other xylene isomers under conditions that prevent ingress of molecular oxygen into the process. A process for separating and purifying a product component comprises: utilizing filter columns as solid-liquid separators in combination with crystallization and reslurry unit operations to recover a product component from a mixture of miscible components; using a crystallizer in series with a filter column; next utilizing a chemical reactor to use a reslurry drum in series with a filter column; and using a combination of crystallizers and/or reslurry drums in series with at least one filter column. A process for purifying para-xylene comprises operating under an operating pressure that is 0.5-30 psi in excess of ambient pressure to limit the ingress of molecular oxygen into the process streams.