Dimerization of cyclopentadiene from side stream from debutanizer
A system and a process for dimerizing cyclopentadiene (CPD) including producing a C 6 +C 7 rich bottoms stream and a C 5 rich side draw from a debutanizer, where the C 5 rich side draw and at least a portion of the C 6 +C 7 rich bottoms stream are directed to a dimerizer where the CPD is thermally dimerized to dicyclopentadiene (DCPD). DCPD is more stable than CPD and thus safer to handle.
1. A process for dimerizing cyclopentadiene (CPD), the process comprising:
introducing a C 4 -C 7 hydrocarbons stream to a debutanizer;
debutanizing the C 4 -C 7 hydrocarbons thereby producing:
a C 4 overhead stream;
a C 6 +C 7 rich bottoms stream; and
a C 5 rich side draw stream comprising cyclopentadiene;
introducing the C 5 rich side draw and at least a portion of the C 6 +C 7 rich bottoms stream to a dimerizer; and
dimerizing the CPD in the dimerizer to produce a pyrolysis gasoline bottoms product stream.
2. The process of claim 1 where the dimerizing is thermal dimerizing.
3. The process of claim 2 where the dimerizer is operated:
at a temperature between about 200° F. (93° C.) and about 250° F. (121° C.); and
at a pressure between about 35 psia (241 kPa) and about 60 psia (414 kPa).
4. The process of claim 2 where the dimerizer is operated:
at a temperature between about 210° F. (99° C.) and about 220° F. (104° C.); and
at a pressure between about 40 psia (276 kPa) and about 50 psia (345 kPa).
5. The process of claim 1 further comprising drawing a C 6 -C 7 rich tar solvent makeup stream from the C 6 +C 7 rich bottoms stream and directing the balance to the dimerizer.
6. The process of claim 1 where the pyrolysis gasoline bottoms product stream comprises dicyclopentadiene (DCPD).
7. The process of claim 6 further comprising making a product from the DCPD selected from the group consisting of an adhesion product, a resin, an ink, a paint, and combinations thereof.