Inhibitor for reducing formation of chlorinated dioxins in manufacture of chlorinated phenols
AssigneeReichhold Chemicals, Inc.
InventorsWilliam H. Wetzel, Hsi-Lung Pan, Robert J. Goodwin, John E. Wilkinson
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Abstract
The invention covers the use of novel co-catalysts as inhibitors that reduce the formation of undesirable chlorinated dioxins during the preparation of pentachlorophenol and tetrachlorophenol from phenol or lower chlorinated phenols.
Claims5
An inhibitor for use in a process of producing polychlorinated phenols to reduce the amount of chlorinated dioxins formed during the reaction of phenol or lower chlorinated phenol or mixtures thereof with chlorine said inhibitor comprising a catalyst consisting essentially of aluminum chloride, ferric chloride, cuprous chloride, metallic aluminum powder, metallic antimony, metallic copper or mixtures thereof, and a compound selected from the group consisting essentially of:
- Antimony pentachloride
- Chromium dichloride
- Chromium powder
- Chromium Sulfide
- Cobalt metal
- Gadolinium trichloride
- Germanium tetrachloride
- Hafnium tetrachloride
- Indium chloride
- Magnesium turnings
- Manganese dichloride
- Niobium chloride
- Zirconium tetrachloride
- Antimony powder
- Bismuth trichloride
- Chromium metal
- Cobalt fluoride
- Iridium chloride
- Niobium pentachloride
- Rhenium pentachloride
- Rhodium trichloride
- Samarium trichloride
- Tantalum chloride
- Tin powder
- Tungsten hexachloride
- Zinc fluoride
- Rubidium trichloride
- and mixtures thereof.
Dependencies are inferred from the claim text.