Patent ID: 6107353
Filing Date: 2000-08-22
Classification: B01D,C01B,C10K

Abstract:
A process for reducing the amount of HCN and NH.sub.3 present in a gas which comprises passing said gas through an HCN hydrolysis zone in the presence of water vapor in which said gas contacts an HCN hydrolysis catalyst at conditions effective to hydrolyze HCN to NH.sub.3 and form a hydrolyzed gas, with said hydrolyzed gas removed from said hydrolysis zone and contacted with water in a scrubbing zone to dissolve NH.sub.3 and at least a portion of remaining HCN to form a scrubbed gas in which the combined total of NH.sub.3 and HCN is less than 50 vppb, wherein said catalyst comprises an oxide of aluminum, an oxide of Mo and an oxide of Ti, wherein said Mo oxide is present in an amount of from 10-20 wt. % and said Ti oxide is present in an amount of 4-20 wt. %, with the remainder comprising alumina and wherein said hydrolysis catalyst is treated with hydrogen at a temperature ranging from 200-600.degree. C. prior to hydrolyzing said HCN to NH.sub.3.