The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 18, 2003
Filed:
Oct. 31, 2001
Eric Arrivat, Istres, FR;
Gacam Benazzouz, Martigues, FR;
Alain Pinede, Ventabren, FR;
Christian Sait, Cornillon-Confoux, FR;
BP Chemicals Limited, London, GB;
Abstract
Isobutene polymerization process wherein a property P (viscosity or average molecular weight) of the polyisobutene product is maintained constant. The polymerization is conducted continuously in a reactor comprising a boiling liquid reaction phase in equilibrium with a gas phase, by continuous introduction into the reactor of a catalyst and of a C4 hydrocarbon feed mixture comprising the monomer, and by continuous withdrawal from the reactor of the liquid reaction phase. The process comprises the determination of a target value V of the partial pressure, PiC4, of the isobutene in the reactor gas phase corresponding to the desired value of the property P, by virtue of an empirical relationship established beforehand between the property P of the polyisobutene product and PiC4. During the polymerization, PiC4 is measured and a corrected value of PiC4, (PiC4) , is calculated and is held constant at around the target value V, by acting on the flow rate Qc of the catalyst and/or on the flow rate Qh of the C4 hydrocarbon feed mixture.