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:
Jan. 14, 2003
Filed:
Jul. 13, 2001
Santi Kulprathipanja, Inverness, IL (US);
Bipin V. Vora, Naperville, IL (US);
William A. Leet, Yorktown, VA (US);
UOP LLC, Des Plaines, IL (US);
Abstract
For the removal of trace quantities of iodine-containing contaminants from corrosive liquid feed streams (e.g. commercial acetic acid), an adsorbent with distinct advantages over prior-art materials is provided. The overall treatment method involves the use of a suitable zeolite having a silica to alumina molar ratio from about 5 to less than 15 that has been cation-exchanged with an iodine-reactive metal. This inorganic adsorbent may be used in unbound form, or it can be bound with a substantially insoluble porous inorganic refractory metal oxide binder. Reactivation and regeneration techniques, which are generally incompatible with prior-art adsorbent materials, are also disclosed. In general, it is advantageous to pretreat the feed streams to remove the most easily separable contaminants (e.g. iodine, hydrogen iodide, and metal cations) and thereby reduce the iodine compound loading and detrimental effects of metals on the adsorbent. Thus, the expensive iodine reactive metal (e.g. silver) used in the adsorbent preparation is judiciously used for the removal of trace quantities of iodine-containing species (e.g. alkyl iodides) that are not readily separable by other means.