Process for thermal treatment of crude phthalic acid

Details Process for thermal treatment of crude phthalic acid Process for thermal treatment of crude phthalic acid

1974-11-11

1977-10-25

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

202173, C07D30789

Patent

active

040555771

ABSTRACT:
There is disclosed a process and apparatus for the thermal treatment of crude phthalic anhydride. The process is conducted in a system with an inner chamber and outer chamber positioned therearound and the chambers have a common wall. The outer chamber may be divided into a plurality of sub-chambers and the flow of the phthalic anhydride undergoing treatment may be substantially reversed in successive ones of the sub-chambers. The system provides for more efficient use of heat and equipment.

REFERENCES:
patent: 2658029 (1953-11-01), Untermann et al.
patent: 2704742 (1955-03-01), Petrich
patent: 3428423 (1969-02-01), Egbert
patent: 3507886 (1970-04-01), Suter et al.
patent: 3655521 (1972-04-01), Gehrken et al.

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