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:
Dec. 05, 1978
Filed:
Apr. 17, 1978
Thomas R Fritsch, Lombard, IL (US);
Mark C Anderson, Palatine, IL (US);
UOP Inc., Des Plaines, IL (US);
Abstract
A mixture of cymene isomers, containing paracymene is subjected to adsorption-separation in contact with a crystalline aluminosilicate adsorbent which selectively retains para-cymene. Raffinate therefrom, being a para-cymene deficient mixture of cymene isomers, is isomerized to form additional para-cymene. Isomerization conditions employed to produce para-cymene, also effect formation of olefinic material. To prevent the adverse effect which olefins exhibit toward the efficiency and capacity of the zeolitic adsorbent, the isomerization effluent is subjected to hydrotreating at conditions which provide a liquid-phase operation and saturate olefins without saturation of the cymene isomers.