Patent · US Expired

Method for deactivating and recovering boron trifluoride when producing polyisobutenes

US6939943B2 · kind B2 · utility

10Cited by

2References

18Claims

0Family size

Assignee

BASF SE

Inventors

Thomas Wettling · Schifferstadt, DE
Dirk Borchers · Birkenheide, DE
Wim Verrelst · Edegem, BE
Hans Peter Rath · Havelsee, DE

Key dates

Filing date	Nov 16, 2001
Grant date	Sep 6, 2005
Priority date	—
Expiry date	Apr 11, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F6/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for deactivating and recovering boron trifluoride when producing polyisobutenes by means of cationic polymerization of isobutene or hydrocarbon streams containing isobutene in the liquid phase in the presence of boron trifluoride or in the form of a boron trifluoride catalyst complex. The catalyst complex is separated, essentially in the liquid phase, from the reactor discharge. The method comprises the following steps: a) removing from the polymerization reactor at −60 to 020 C., methanol, ethanol or a mixture of methanol and ethanol in such a quantity that an alcohol phase rich in boron trifluoride is formed; b) separating the alcohol phase according to (a) and, (c) optionally recycling the boron trifluoride of the alcohol phase obtained from (b) to the method in a suitable manner.

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