This volume comprises the papers presented at the Second International Symposium on Gas Cleaning at High Temperatures, held at the University of Surrey, Guildford, UK on 27-29 September, 1993. The Symposium was organised by the Department of Chemical and Process Engineering and the Centre for Environmental Strategy of the University of Surrey, and co-sponsored by The Institution of Chemical Engineers, The Filtration Society and the Royal Society of Chemistry. Co-chairmen R. Clift Centre for Environmental Strategy, University of Surrey J. P. K. Seville Department of Chemical and Process Engineering, University of Surrey Secretary Centre for Environmental Strategy, University of Surrey J. Libaert Scientific Committee British Coal Research Establishment, Cheltenham, UK P. Cahill Shell International, The Hague, Netherlands W. A. Dries University of Karlsruhe, Germany P. Gang Van Tongeren International, Godalming, UK R. R. Greenfield Blue Circle Technical Centre, Greenhithe, UK C. P. Kerton Powergen, Solihull, UK W. S. Kyte Separation Processes Service, Harwell, UK K. Morris Pall Process Filtration, Portsmouth, UK N. Moss Pilkington, Ormskirk, UK G. A. Rimmer Lodge Sturtevant, Birmingham, UK A. Russell-Jones J. Strickland Davy McKee, Stockton-an-Tees, UK Glosfume Environmental Controls, Ashleworth, UK C. J. Withers Financial sponsors Shell International Inc.