C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
C23G 5/02 (2006.01) B01D 3/38 (2006.01) C23G 5/028 (2006.01)
Patent
CA 2051291
QM 36074 ABSTRACT CLEANING OF ARTICLES Articles contaminated with soil etc are cleaned by contact with a non-chlorinated organic solvent having a relatively low flashpoint, such contact being made at a temperature below such flashpoint. The articles are then contacted with an aqueous rinsing medium at a temperature below the flashpoint of the solvent. These steps lead to contamination of the solvent and the rinsing medium and to free them of the contaminants, which are substantially non-volatile, the contaminated solvent and rinsing medium are fed to a steam distillation unit in which the rinsing medium and solvent are co-distilled at a temperature above the flashpoint of the solvent. The steam distillation is carried out in a fire hazard containment zone in which oxygen is substantially excluded during normal operation of the steam distillation unit by the water/solvent vapour generated, and during commencement and cessation phases of steam distillation by the generation of an inert gaseous fluid.
Garvey Kevin M.
Weemes Geoffrey C.
Garvey Kevin M.
Imperial Chemical Industries Plc
Marks & Clerk
Weemes Geoffrey C.
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