Process for producing isoprene

Details Process for producing isoprene Process for producing isoprene

1976-01-21

1978-01-10

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 1118

Patent

active

040679233

ABSTRACT:
A process for producing isoprene comprising reacting formaldehyde and isobutylene or trimethylcarbinol or with a mixture of isobutylene with trimethylcarbinol in a liquid phase upon heating to a temperature of about 200.degree. C in the presence of a catalyst, viz. sulphamic acid or an aromatic ammonium compound containing a sulpho group in ortho-, meta- or para-position and having the formula: ##STR1## wherein R.sub.1 and R.sub.2 are hydrogen, an alkyl, aryl, alkylaryl, aralkyl;
Hydrogen atoms in the benzene ring may be substituted for an alkyl, halide or sulpho group; or in the presence of a catalyst such as an ammonium condensed compound of the naphthalene series containing a sulpho group and having the formula: ##STR2## wherein R.sub.1 and R.sub.2 are hydrogen, an alkyl, aryl, alkylaryl, aralkyl; and as the calalyst use is made of reaction products of said ammonium compounds with formaldehyde, followed by isolation of the desired product.
Isoprene produced by the process according to the present invention is useful in the production of various rubbers.

REFERENCES:
patent: 2350485 (1944-06-01), Arundale et al.
patent: 2381148 (1945-08-01), Weizmann
patent: 2993940 (1961-07-01), Oldnam
patent: 3536744 (1970-10-01), Itoi et al.

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