Process for the production of 2-chlorobutadiene-1,3 from 3,4-dic

Details Process for the production of 2-chlorobutadiene-1,3 from 3,4-dic Process for the production of 2-chlorobutadiene-1,3 from 3,4-dic

1974-01-31

1976-06-22

Horwitz, D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 2120

Patent

active

039652033

ABSTRACT:
A process is described whereby 2-chlorobutadiene-1,3 is produced from 3,4-dichlorobutene-1 in a two-phase reaction system wherein the reaction predominantly occurs in the organic phase and the production of undesirable by-products, particularly 1-chlorobutadiene-1,3 and acetaldehyde, is suppressed. The practice of the process results in a brine effluent from the reactor containing small amounts of organic materials resulting in a waste product which is less polluting and more easily cleaned.
The organic phase is selected from primary and secondary alcohols, alkoxyethanols and mixtures thereof, preferably alkoxyethanols wherein the alkyl group has two or more carbon atoms. Surprisingly, I have discovered that the selection of the organic phase of the reaction system is made by a screening test wherein a two-phase system of a 20% brine and 3,4-dichlorobutene-1 is prepared and the alcohol or alkoxyethanol being investigated is added to obtain equilibrium in the system. Materials selected as the organic phase material are selected from those where the product of the weight percent water in the organic phase and weight percent alcohol being investigated in the organic phase is greater than 200.

REFERENCES:
patent: 3079446 (1963-02-01), Mac Farlane

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