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:
Sep. 27, 1977
Filed:
Apr. 27, 1976
Applicant:
Inventors:
Siegfried Rebsdat, Winhoring, Burg, DT;
Sigmund Mayer, Burgkirchen-Holzen, DT;
Josef Alfranseder, Hofschallern, DT;
Assignee:
Hoechst Aktiengesellschaft, , DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
252412 ; 252414 ; 26034823 ;
Abstract
The efficiency of silver carrier catalysts having reduced activity for the manufacture of ethylene oxide by reacting ethylene with oxygen or air is improved by impregnating the used catalyst with a solution containing cesium and/or rubidium compounds, an aliphatic alcohol and at most 10% by weight of water. After impregnation the alcohol and optionally the water are evaporated. The cesium and/or rubidium content of the impregnating solution and the number of impregnations are adjusted to obtain on the carrier a cesium and/or rubidium concentration of from 1 to 1,000 ppm.