Method and apparatus for separating aromatic dialdehyde

Details Method and apparatus for separating aromatic dialdehyde Method and apparatus for separating aromatic dialdehyde

2008-07-01

2008-07-01

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

Reexamination Certificate

active

11430201

ABSTRACT:
The present invention relates to a method and an apparatus for continuously separating aromatic dialdehyde from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene. The method for continuously separating aromatic dialdehyde includes the steps of congealing aromatic dialdehyde by cooling the gas-phase reaction mixture including the aromatic dialdehyde, which is obtained by gas-phase oxidation of dimethylbenzene, to 5-70° C. and separating the congealed aromatic dialdehyde from the remaining reaction mixture. Using the method and apparatus in accordance with the present invention, aromatic dialdehyde can be effectively and selectively separated from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene in high yield.

REFERENCES:
patent: 2888488 (1959-05-01), Nace
patent: 3845137 (1974-10-01), Magder
patent: 3946067 (1976-03-01), Kwiatek et al.
patent: 4017547 (1977-04-01), Simmons et al.
patent: 4465865 (1984-08-01), Englander et al.
patent: 6458737 (2002-10-01), Kishimoto et al.

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