Entwicklungstendenzen Der Industriellen Gesellschaft

Sulfuric Acid and Sulfur Trioxide

“…Reaction with a platinum catalyst involves heterogeneous gas -solid catalysis [22], [23], [26]. In contrast, according to present understanding, oxidation over a vanadium catalyst is a homogeneous reaction that takes place in a liquid melt of active components on both the external and internal surfaces of an inert solid catalyst carrier [41], [42].…”

“…Double Absorption. In 1960, a patent application was filed by Bayer [26] for the socalled double-catalysis process, and the first plant using this process, built by Lurgi, started up in 1964 [27]. By incorporating a preliminary SO 3 absorption step ahead of the final catalytic stages, the improved contact process permitted a decisive increase in overall SO 2 conversion, thus reducing SO 2 emissions substantially.…”