Dehydrohalogenation process

Details Dehydrohalogenation process Dehydrohalogenation process

1982-11-29

1983-11-29

Warren, Charles F.

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

Organic compounds

Halogen containing

570229, C07C 1734

Patent

active

044182325

ABSTRACT:
Improvement in the catalytic dehydrohalogenation of a halogenated hydrocarbon to an ethylenically unsaturated product with aqueous alkali in a series of reactors in a cascade arrangement, wherein the fresh alkali feed is relocated from the first reactor to a reactor subsequent to the first, and partly spent alkali solution from the last reactor is recirculated to the first reactor, while the ethylenically unsaturated product is recovered from the effluent from the last reactor, and waste brine is removed from the effluent from the reactor immediately preceding that to which fresh alkali is fed. In this manner, the amount of both the alkali and the catalyst can be reduced, and the conversion is increased. Dehydrochlorination of 3,4-dichlorobutene-1 gives chloroprene, which is a valuable monomer for making synthetic elastomers.

REFERENCES:
patent: 3754044 (1973-08-01), Hargreaves et al.
patent: 3981937 (1976-09-01), Campbell et al.

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