Imperial Chemical Industries Limited

Brian Schofield

Ralph J Doy

Charles Brian Blake

Stephen John Adams

Rowland J Brierley

Ann San Liow

Jane Andrea Roberts

James Malcolm Forsyth

Neil David Shilling

John Edward Cassidy

Water present in a hot gaseous product stream from a reactor system A.B (FIG. 1) containing hydrogen fluoride is separated from the stream in order to eliminate a potentially corrosive combination of water and HF. The water is removed by contacting the gaseous product stream with liquid HF in a distillation column so as to obtain a bottoms product containing liquid HF and water and a top product containing dry HF and the product to be recovered. The invention encompasses the separation process, a vessel for carrying out the process (FIGS. 2 to 4), a control system for the liquid HF supply to the distillation column (FIGS. 5 and 6) and a recovery system for recovering HF employed during operation of the reactor system in different regimes employing HF as a fluorination agent, as a diluent during catalyst regeneration and/or catalyst prefluorination (FIG. 7).

Water separation process

Water present in a hot gaseous product stream from a reactor system A,B (FIG. 1 ) containing hydrogen fluoride is separated from the stream in order to eliminate a potentially corrosive combination of water and HF. The water is removed by contacting the gaseous product stream with liquid HF in a distillation column so as to obtain a bottoms product containing liquid HF and water and a top product containing dry HF and the product to be recovered. The invention encompasses the separation process, a vessel for carrying out the process (FIGS. 2 to 4), a control system for the liquid HF supply to the distillation column (FIGS. 5 and 6) and a recovery system for recovering HF employed during operation of the reactor system in different regimes employing HF as a fluorination agent, as a diluent during catalyst regeneration and/or catalyst prefluorination (FIG. 7 ).

A mixture comprising at least one binder for a refractory aggregate which binder is a halogen-containing complex phosphate of aluminium containing one or more chemically-bound molecules of water and/or one or more chemically-bound oxygen-containing organic molecules, and at least one inhibitor which is an acetylenic alcohol having the structure

Refractory composition with a binder and a bloating inhibitor

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Atherton, United Kingdom

Brian Schofield