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:
May. 24, 2005
Filed:
Apr. 30, 2002
Veli-matti Purola, Hamari, FI;
Sami Toppinen, Helsinki, FI;
Antti Pyhälahti, Helsinki, FI;
Marina Lindblad, Helsinki, FI;
Johan Grönqvist, Helsinki, FI;
Pirjo Siira, Järvenpää, FI;
Veli-Matti Purola, Hamari, FI;
Sami Toppinen, Helsinki, FI;
Antti Pyhälahti, Helsinki, FI;
Marina Lindblad, Helsinki, FI;
Johan Grönqvist, Helsinki, FI;
Pirjo Siira, Järvenpää, FI;
Fortum Oyj, Espoo, FI;
Abstract
The invention relates to a method for dimerizing isobutene, wherein, in dimerizing conditions, the isobutene is brought into contact with a porous cation exchange resin comprising a styrene polymer, which is cross-linked with divinyl benzene, and any sulphonic acid groups adhering to the polymer. The harmful deactivation of this catalyst, which is caused by the accumulation of the oligomers and polymers of isobutene and other C-olefins in the cation exchange resin catalyst, is essentially decreased by selecting the cation exchange resin from a group including cation exchange resins, the acid capacity of which is 4.7 equivalents/kg at a minimum, and the portion of divinyl benzene units of which is 5% by weight at a minimum and smaller than 20% by weight.