SYSTEMS AND METHODS FOR PRODUCING DESIRED XYLENE ISOMERS

摘要

Methods and systems are provided for producing a desired xylene isomer. The method includes adsorbing the desired xylene isomer from a mixed xylene stream in an adsorbent chamber. The desired xylene isomer is desorbed with a desorbent to produce an extract stream with the desired xylene isomer and the desorbent, where the desorbent has a lower boiling point than the desired xylene isomer. The extract stream is fractionated in an extract fractionator to produce a low pressure extract overhead stream with gaseous desorbent. The low pressure extract overhead stream is pressurized to produce a high pressure extract overhead stream with a temperature greater than an extract reboiler temperature. The high pressure extract overhead stream is condensed in an extract process reboiler, and produces a liquid extract overhead stream

主权项

1. A method for producing a desired xylene isomer, the method comprising the steps of:
absorbing the desired xylene isomer from a mixed xylene stream in an adsorbent chamber; desorbing the desired xylene isomer with a desorbent to produce an extract stream, wherein the extract stream comprises the desired xylene isomer and the desorbent, and wherein the desorbent has a desorbent boiling point lower than a desired xylene isomer boiling point; fractionating the extract stream in an extract fractionator to produce a low pressure extract overhead stream, wherein the low pressure extract overhead stream comprises the desorbent in the gaseous state, and wherein the extract fractionator comprises an extract process reboiler; pressurizing the low pressure extract overhead stream to produce a high pressure extract overhead stream, wherein pressurizing the low pressure extract overhead stream produces a high pressure extract overhead stream temperature above an extract reboiler temperature; and condensing the high pressure extract overhead stream in the extract process reboiler to produce a liquid extract overhead stream.