Dehydrohalogenation processes

Details Dehydrohalogenation processes Dehydrohalogenation processes

1996-07-09

1998-05-12

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570135, 570136, 570177, C07C 1700

Patent

active

057508089

ABSTRACT:
A process is disclosed for the dehydrohalogenation of partially halogenated ethanes of the formula C.sub.2 H.sub.a Cl.sub.b F.sub.c where a is an integer from 1 to 4, b is an integer from 0 to 3 and c is an integer form 1 to 5 to produce olefins selected from the group consisting of C.sub.2 H.sub.a-1 Cl.sub.b-1 F.sub.c and C.sub.2 H.sub.a-1 Cl.sub.b F.sub.c-1. The process involves contacting C.sub.2 H.sub.a Cl.sub.b F.sub.c with a zeolite selected from the group consisting of NaX and CsY. Selective reaction of one isomer from a mixture of two isomers is disclosed as a means for purification of the relatively unreactive isomer. Also disclosed is a process for producing perfluorocyclobutane which involves contacting CHF.sub.2 CClF.sub.2 with such zeolites.

REFERENCES:
patent: 2404374 (1946-07-01), Harmon
patent: 4605798 (1986-08-01), Abel et al.
patent: 5396000 (1995-03-01), Nappa et al.
A.M.Lovelace et al., Aliphatic Flourine Compounds, Am. Chem. Soc. Reinhold Publishing Corp., 100-104, 1958.
R.M.Barrer et al., Sorption and Reactivity of Simple Organic Molecules in Chabazite, Trans. Faraday Soc., 49, 940-948, Mar. 1953.

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