Highly aromatic polyurea/urethane membranes and their use for the separation of aromatics from non-aromatics
Polyimide/aliphatic polyester copolymers
Polyimide aliphatic polyester copolymers (C-2356)
Highly aromatic polyurea/urethane membranes and their use of the separation of aromatics from non-aromatics Patent #: 5063186
ApplicationNo. 169847 filed on 12/17/1993
US Classes:585/318, Having unsaturated ring585/803, To recover alicyclic585/818By membrane, selective septum, or coalescer
ExaminersPrimary: Sneed, Helen M. S.
Assistant: Phan, Nhat D.
Attorney, Agent or Firm
International ClassesC07C 007/00
AbstractA process for purifying crude dicyclopentadiene which comprises the steps of: cracking the crude dicyclopentadiene to form a monomeric-containing effluent which comprises at least one monomer selected from the group consisting of: C4 acyclic dienes, C5 acyclic dienes, cyclopentadiene and methylcyclopentadiene; separating the monomeric-containing effluent into a cyclopentadiene-enriched stream and a cyclopentadiene-poor stream; dimerizing the cyclopentadiene-enriched stream to form a dimerizer effluent; contacting a membrane separator under pervaporation conditions with the dimerizer effluent wherein the C4 acyclic dienes, C5 acyclic dienes and cyclopentadiene permeate through the membrane separator and wherein a dicyclopentadiene product having a purity of at least about 98% is retained as retentate.