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. 26, 1998
Filed:
Aug. 05, 1992
John Di-Yi Ou, Houston, TX (US);
Exxon Chemical Patents Inc., Houston, TX (US);
Abstract
A method is provided for simply and effectively increasing monoalkylation of aromatic compounds while also increasing the life of the acid catalyst used to alkylate said compounds. The method and apparatus involve drastically reducing the amount of the alkylation agent present in the reaction mixture, e.g., to at least about a 99:1 excess of aromatic, preferably to about a 999:1 excess of aromatic. In a preferred embodiment, the alkylation agent is introduced intermittently, or in stages, at a ratio of at least 999:1 so that the excess of aromatic may be maintained at all points in the reactor in order to most effectively prolong the life of the catalyst. For continuous operation, a single reactor equipped with multiple injection ports may be used, or multiple reactors may be connected in series adapted so that the alkylation agent may be introduced prior to each reactor.