Mixture of homologue anhydrides of tetra-hydrophthalic anhydride

Details Mixture of homologue anhydrides of tetra-hydrophthalic anhydride Mixture of homologue anhydrides of tetra-hydrophthalic anhydride

1974-08-26

1976-08-24

Engle, Samuel W.

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

2603466, 2603467, C09K 300, C07D30789, C07D30793

Patent

active

039765903

ABSTRACT:
A mixture of anhydrides homologous to tetra-hydrophthalic anhydride, having a melting point between 40.degree. and 50.degree.C. and comprising from 30 to 50 % of endo-methylene-tetrahydrophthalic anhydride, from 30 to 45 % of methyl-4-tetrahydrophthalic anhydride and from 10 to 25 % of methyl-3-tetrahydrophthalic anhydride and is obtained by the reaction in counter-flow of maleic anhydride with a petro-chemical C5 fraction, containing cyclopentadiene, isoprene and piperylene in substantially the same amount, together with other unsaturated C5 hydrocarbon fractions, selected from the group comprising the fractions derived from steam-cracking and pyrolysis of naphtha, the control of the conditions of temperature and flow-rate in order to have an essentially complete reaction, and the recovery of the resulting mixture of anhydrides.

REFERENCES:
patent: 3245916 (1966-04-01), Woskow
patent: 3247125 (1966-04-01), Woskow
patent: 3326941 (1967-06-01), Campagne
patent: 3341555 (1967-09-01), Wooster
patent: 3580857 (1971-05-01), Cheng
patent: 3580858 (1971-05-01), Evans
patent: 3600356 (1971-08-01), Murai
patent: 3647701 (1972-03-01), Robinson
patent: 3691083 (1972-09-01), Niklaus
patent: 3775335 (1973-11-01), Irwin

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