Upgrading drip oil
View Patent ↗A method is disclosed for upgrading drip oil comprising subjecting the drip oil to multiple distillation steps to form a stream rich in aromatics and a separate stream rich in dicyclopentadiene.
1. A method for upgrading drip oil comprising subjecting said drip oil to a first fractional distillation to form a first overhead stream containing C 6 and C 7 hydrocarbons and a first bottoms stream containing C 8 and heavier hydrocarbons, subjecting said first bottoms stream to a second fractional distillation to form a second overhead stream containing C 8 to C 10 , inclusive, hydrocarbons and a second bottoms stream containing C 11 and heavier hydrocarbons, subjecting said second overhead stream to a third fractional distillation to form a third overhead stream containing C 8 to C 10 , inclusive, hydrocarbons which is aromatic rich, a third bottoms stream which contains C 11 and heavier hydrocarbons, and a first side stream that contains substantial amounts of dicyclopentadiene.
2. The method of claim 1 wherein said drip oil consists essentially of C 5 to C 12 , inclusive, paraffins and cycloparaffins including alicyclics and aromatics, and boils in the range of from about 100 to about 420° F.
3. The method of claim 1 wherein said first overhead and said first bottoms streams consist essentially of saturated and unsaturated paraffins and cycloparaffins including alicyclics and aromatics, said second overhead stream contains a major amount of dicyclopentadiene and co-dimers of cyclopentadiene, said third overhead stream contains a major amount of aromatics, and said first side stream contains a major amount of dicyclopentadiene and co-dimers of cyclopentadiene.
4. The method of claim 3 wherein said first side stream contains at least about 75 wt. % dicyclopentadiene; and at least about 5 wt. % of a mixture of isoprene dimer, and co-dimers of isoprene and cyclopentadiene, piperylene and cyclopentadiene, and isoprene and cyclopentene; all wt. % based on the total weight of said first side stream.
5. The method of claim 1 wherein said first distillation is conducted at a temperature of from about 100 to about 250° F. at a pressure of from about 5 to about 150 psig, said second distillation is conducted at a temperature of from about 120 to about 300° F. at a pressure of from about 0.5 to about 4 psig, and said third distillation is conducted at a temperature of from about 20 to about 300° F. at a pressure of from about 0.5 to about 8 psig.