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:
Nov. 16, 1993
Filed:
Dec. 26, 1991
Beth McCulloch, Clarendon Hills, IL (US);
UOP, Des Plaines, IL (US);
Abstract
The present invention relates in general to highly siliceous zeolitic molecular sieve adsorbent compositions having reduced catalytic activity and to the process for preparing such compositions. The number of acid sites in the so-called silica molecular sieves is very low, but exhibit a disproportionately high acid activity. In a variety of adsorptive separation applications in which the hydrophobic character of these molecular sieves is important, undesirable catalytic conversion of one or more of the adsorbates is frequently encountered. This acid activity is effectively eliminated by incorporating a stoichiometric excess with respect to the aluminum content of the molecular sieve of an alkali metal compound into the molecular sieve followed by calcining the loaded silicalite at temperatures of at least 750.degree.C. The adsorbent is particularly useful in separations of materials which are subject to catalytically initiated reactions, e.g., olefins and alcohols.