PROCESS FOR THE PREPARATION OF 1,1-DICHLORO-1-FLUOROETHANE

Process for the preparation of 1,1-dichloro-1-fluoroethane (known in the craft as HCFC-141b). The process comprises a stage consisting in reacting vinylidene chloride with an excess of anhydrous hydrogen fluoride in the presence of a catalytic quantity of a catalyst of formula RmAXnFp, in which A de...

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Hauptverfasser:	HSUEH SUNG TUNG, ADDISON MILES SMITH
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	Process for the preparation of 1,1-dichloro-1-fluoroethane (known in the craft as HCFC-141b). The process comprises a stage consisting in reacting vinylidene chloride with an excess of anhydrous hydrogen fluoride in the presence of a catalytic quantity of a catalyst of formula RmAXnFp, in which A denotes titanium, zirconium or hafnium, R denotes an alkyl, alkenyl or aryl radical, X denotes chlorine or bromine, m is a number ranging from 0 to 2, n a number ranging from 0 to 4 and p a number ranging from 0 to 4, but at least one of the numbers n and p is not zero and the sum m + n + p satisfies the valency of A, for a period and at a temperature which are sufficient to form 1,1-dichloro-1-fluoro- methane. This compound is useful as a blowing agent for the production of thermally insulating rigid urethane foams.