Process for manufacturing chloroprene and 2,3-dichlorobutadiene-

Details Process for manufacturing chloroprene and 2,3-dichlorobutadiene- Process for manufacturing chloroprene and 2,3-dichlorobutadiene-

1979-04-02

1980-07-29

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260654D, C07C 2120

Patent

active

042150787

ABSTRACT:
An improved process for the production of chloroprene, which is the critical monomer constituent of neoprene rubbers, and of 2,3-dichlorobutadiene-1,3, which often is copolymerized with chloroprene to provide better low temperature properties of the resulting elastomer, involves dehydrochlorination of a chlorinated hydrocarbon such as 3,4-dichlorobutene-1, 2,3,4-trichlorobutene-1, or 1,2,3,4-tetrachlorobutane, with an aqueous mixture of sodium hydroxide and sodium chloride having the composition of chlor/alkali cell liquor; separation of the organic phase from which the desired product, chloroprene or 2,3-dichlorobutadiene-1,3, is recovered by distillation; and recirculation of the aqueous (brine) phase to the electrolysis apparatus, from which the sodium hydroxide-sodium chloride liquor is returned to the dehydrochlorination step. This process saves energy in that it does not require cell liquor concentration to isolate pure sodium hydroxide, and it is environmentally desirable because it avoids problems associated with brine disposal.

REFERENCES:
patent: 2539307 (1951-01-01), Koll
patent: 2999888 (1961-09-01), Crocker
patent: 3188357 (1965-06-01), Blumbergs
patent: 3639492 (1972-02-01), Campbell
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patent: 3754044 (1973-08-01), Hargreaves et al.
patent: 3876716 (1975-04-01), Campbell
patent: 3936508 (1976-02-01), Wenzel et al.
patent: 3965203 (1976-06-01), Smith
patent: 3981937 (1976-09-01), Campbell et al.

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