Patent ID: 9266796
Filing Date: 2016-02-23
CPC Classification: B01D,C07C

Claim Text:
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.