Phthalic anhydride formation and separation

Details Phthalic anhydride formation and separation Phthalic anhydride formation and separation

1979-10-05

1980-11-11

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603464, C07D30789

Patent

active

042332273

ABSTRACT:
Undesirable discoloration of resultant phthalic anhydride and decomposition thereof and/or o-phthalic acid accompanying dehydration of o-phthalic acid to its anhydride in the presence of oxidation catalyst components Co, Mn and Br can be avoided by the rapid dehydration of o-phthalic acid and rapid vaporization of its anhydride occurring at a reduced pressure of downward from 760 mm Hg down to 40 mm Hg and at a temperature of from 180.degree. C. up to 250.degree. C. under continuous flow conditions which permit rapid removal of anhydride as vapor stream from catalyst components remaining as part of a fluid residue.

REFERENCES:
patent: 3402184 (1968-09-01), Berthoux
patent: 3920735 (1975-11-01), Wampfler et al.

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