Patent · US Expired

Process for the isolation of high boilers from the cyclooligomerization of 1,3-butadiene

US6407304B2 · kind B2 · utility

7Cited by

2References

17Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Thomas Schiffer · Haltern, DE
Matthias May · Dorsten, DE
Norbert Wilczok · Wiesloch, DE
Georg Oenbrink · Schneverdingen, DE

Key dates

Filing date	Jan 31, 2001
Grant date	Jun 18, 2002
Priority date	—
Expiry date	Jan 31, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C7/10
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the isolation of high-boiling monomers from distillation residue formed in the cyclodimerization and/or cyclotrimerization of 1,3-butadiene after target products of cyclooctadiene, vinylcyclohexene and/or cyclododecatriene have been separated off, comprising extracting the distillation residue with a nonpolar or slightly polar solvent, separating off insoluble oligomers and polymers that have at least partly crystallized by mechanical separation, removing the extractant, and isolating the high-boiling monomers.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.