Method to recover cyclic diolefin monomer from its dimer in the production of alkenyl bridged ring compounds
AssigneeExxon Chemical Patents Inc. (ECPI)
InventorsJames R. Lattner, Leonel E. Sanchez
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Abstract
The present invention relates to a method for using a single distillation column to recover the reactants and products from the reaction of a cyclic diolefin and an olefin to produce an alkenyl bridged ring compound.
Claims32
A method for using a single distillation column to recover the reactants and products from the reaction of a cyclic diolefin and an olefin to produce an alkenyl bridged ring compound comprising:
- (a) feeding an effluent from the reaction of said cyclic diolefin with said olefin to a distillation column;
- (b) removing said alkenyl bridged ring compound from said distillation column as a side stream at a location below said effluent feed;
- (c) removing an overhead from said column comprising said cyclic diolefin, predominantly in monomeric form, leaving a bottoms comprising said cyclic diolefin, predominantly in dimerized form, and heavy byproduct;
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- (d) cracking the dimerized cyclic diolefin in said bottoms whereby additional monomeric cyclic diolefin is recovered.
An improved method for recovering reactants and products from the production of 5-vinyl-2-norbornene comprising:
- (a) reacting 1,3-butadiene with a 1,3-cyclopentadiene or dicyclopentadiene feed to form an effluent;
- (b) feeding said effluent to a distillation column;
- (c) removing 5-vinyl-2-norbornene from said distillation column as a side stream at a location below said effluent feed;
- (d) removing an overhead comprising 1,3-cyclopentadiene from said column, leaving a bottoms comprising dicyclopentadiene and heavy byproduct;
- (e) cracking said bottoms in said column for at least one hour at a temperature of about 175.degree. C. (347.degree. F.) at a pressure between about 11-17 psia (75.8-117.2 kPa) to form additional cyclopentadiene;
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- (f) recovering said additional 1,3-cyclopentadiene.
Cyclopentadiene produced by a method comprising the following steps:
- (a) reacting 1,3-butadiene with a 1,3-cyclopentadiene or dicyclopentadiene feed to form an effluent;
- (b) feeding said effluent to a distillation column;
- (c) removing 5-vinyl-2-norbornene from said distillation column as a side stream at a location below said effluent feed;
- (d) removing an overhead comprising cyclopentadiene from said column, leaving a bottoms comprising dicyclopentadiene and heavy byproduct;
- (e) cracking said bottoms for at least fifteen minutes at a temperature above about 130.degree. C. (266.degree. F.) at a pressure between about 5-30 psia (34.4-206.8 kPa) to form additional cyclopentadiene;
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- (f) recovering said additional cyclopentadiene without removing said bottoms from said column.
5-vinyl-2-norbornene produced by a method comprising the steps of:
- (a) reacting butadiene with a cyclopentadiene feed to form an effluent;
- (b) feeding said effluent to a distillation column;
- (c) removing 5-vinyl-2-norbornene from said distillation column as a side stream at a location below said effluent feed;
- (d) removing an overhead comprising cyclopentadiene from said column, leaving a bottoms comprising dicyclopentadiene and heavy byproduct;
- (e) cracking said dicyclopentadiene for at least fifteen minutes at approximately 175.degree. C. (347.degree. F.) at a pressure between about 11-17 psia (75.8-117.2 kPa) to form additional cyclopentadiene;
- (f) recovering said additional cyclopentadiene.
Dependencies are inferred from the claim text.