Patent ID: 6737557
Filing Date: 2004-05-18
Classification: C07C,C10G

Abstract:
A process for recovering DCPD from a hydrocarbon feedstock comprising the steps of:a) providing a first separation column, a first overhead condenser, and a first reboiler, said first separation column defining a first separation zone having an upper portion, a lower portion and an intermediate portion, said intermediate portion of said first separation zone comprising at least about 50 theoretical trays; b) providing a second separation column, a second overhead condenser, and a second reboiler, said second separation column defining a second separation zone having an upper portion, a lower portion and an intermediate portion, said intermediate portion of said second separation zone comprising at least about 9 theoretical trays; c) introducing a hydrocarbon feedstock comprising DCPD to said intermediate portion of said first separation zone; d) allowing a first vaporous overhead stream comprising C9âˆ’hydrocarbons, and having a pressure in the range of from about 0.5 psia to about 3.0 psia and a temperature in the range of from about 160Â° F. to about 200Â° F., to pass from said upper portion of said first separation column to said first overhead condenser; e) condensing at least a portion of said first vaporous overhead stream in said first overhead condenser thereby forming a first condensate which has a temperature in the range of from about 50Â° F. to about 90Â° F.; f) refluxing at least a portion of said first condensate from said first overhead condenser to said upper portion of said first separation zone; g) allowing a first liquid bottoms stream comprising C10+hydrocarbons to pass from said lower portion of said first separation column to said first reboiler; h) reboiling at least a portion of said first liquid bottoms stream in said first reboiler at a temperature in the range of from about 210Â° F. to about 250Â° F. thereby forming a first reboiled stream and a remaining portion of said first liquid bottoms stream; i) introducing said first reboiled stream to said lower portion of said first separation zone; j) introducing the remaining portion of said first liquid bottoms stream to said intermediate portion of said second separation zone; k) allowing a second vaporous overhead stream comprising DCPD, and having a pressure in the range of from about 0.1 psia to about 2.0 psia and a temperature in the range of from about 160Â° F. to about 200Â° F., to pass from said upper portion of said second separation zone to said second overhead condenser; l) condensing at least a portion of said second vaporous overhead stream in said second overhead condenser thereby forming a second condensate which has a temperature in the range of from about 80Â° F. to about 100Â° F.; m) refluxing at least a portion of said second condensate to said upper portion of said second separation zone and thereby forming a remaining portion of said second condensate; n) allowing a second liquid bottoms stream comprising fuel oil to pass from said lower portion of said second separation zone to said second reboiler; o) reboiling at least a portion of said second liquid bottoms stream in said second reboiler at a temperature in the range of from about 190Â° F. to about 240Â° F. thereby forming a second reboiled stream; p) introducing said second reboiled stream to said lower portion of said second separation zone; and q) recovering the remaining portion of said second condensate from said second overhead condenser thereby forming a DCPD stream.