Tk« hyûrogca abatraetion froa tha chlarinatad athaaaa hj ohloriaa ataaa hac baan iavaatigatad in tha gaa phaaa batvaaa 323 aad 423*X. Akaaluta Taluaa of tha rata eonatanta hara baan obtainad uaing a compatition nathod with ehlorefona ar aathjl ehlarida aa eospetltor. Tha aetiratian anargiaa aad tha pra->azponaatial faetora ara diaenaaad.

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The thermal decompositions of I-chloro-1-fluoroethane and 1-chloro-1,l-difluorethane at atmospheric pressure have been studied in the temperature range 500-6OO0C in a flow system. The dehydrochlorinations are homogenous in a carbonaceous reactor and unimolecular. The rate constants are given by The criteria for molecular or chain processes in thermal dehydrochlorinations are discussed.