C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/662.3
C07C 21/21 (2006.01) C07C 17/25 (2006.01)
Patent
CA 1207803
TITLE IMPROVED CHLOROPRENE MANUFACTURING PROCESS ABSTRACT OF THE DISCLOSURE 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-l gives chloroprene, which is a valuable monomer for making synthetic elastomers.
441830
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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