Apparatus and process for reducing coking of heat exchange surfaces

摘要

PCT No. PCT/DE95/00281 Sec. 371 Date Jul. 22, 1996 Sec. 102(e) Date Jul. 22, 1996 PCT Filed Feb. 21, 1995 PCT Pub. No. WO95/22588 PCT Pub. Date Aug. 24, 1995A heat exchange surface in reactors and/or heat exchangers of installations for the conversion of hydrocarbons and other organic compounds at high temperatures in the gaseous phase. According to the invention, the metallic surfaces coming into contact with the organic substances are treated at a temperature of 300 to 1000 DEG C. over a period of 0.5 to 12 hours with a mixture of a silicon- and sulfur-containing product and a dry gas flow which is inert with respect to the silicon- and sulfur-containing product. The invention is further directed to a process for producing a catalytically inactivated metallic surface in chemical reactors and/or heat exchangers.