Patent ID: 6773490
Filing Date: 2004-08-10
Classification: B01D,B01J,C01B,Y10S

Abstract:
A process for reversible sorption of sulfur troxide onto a sorbent comprising a) at a site equipped for handling bulk quantities of sulfur trioxide contacting from about 15% to 100% sulfur trioxide in an inert gas with the sorbent under anhydrous conditions at a temperature of from about 35Â° C. to about 150Â° C. thereby sorbing the sulfur trioxide onto the sorbent which sorbent is then capable of storage, and transporting said sorbent in a container to a site requiring delivery of sulfur trioxide, b) at said site requiring delivery desorbing sulfur trioxide from the sorbent at a temperature of from about 150Â° C. to about 350Â° C. at about atmospheric pressure, or under a vacuum pressure, and transporting said sorbent to said site for handling bulk quantities of sulfur trioxide, and c) recycling said sorben by continuously repeating steps a) and b), wherein said sorbent has structural stability upon recycle, a pore size of at least 0.5 nm, and consists essentially of silica or zeolite, said zeolite having a silicon to aluminum ratio equal to about 15, or greater.