Column for concentrating phthalic anhydride

Details Column for concentrating phthalic anhydride Column for concentrating phthalic anhydride

2005-04-26

2005-04-26

Manoharan, Virginia (Department: 1764)

Distillation: apparatus

Apparatus

Systems

C202S156000, C202S205000, C202S267100, C203S080000, C203S086000, C549S247000, C549S250000

Reexamination Certificate

active

06884324

ABSTRACT:
To improve the columns used so far for producing phthalic anhydride, and to make them less expensive and easier to install, it is proposed that in the column for concentrating phthalic anhydride two distillation stages are arranged, wherein the removal of the low-boiling components of the crude phthalic anhydride by distillation is effected in the first distillation stage (2) and the separation of the high-boiling components from the pure phthalic anhydride is effected in the second distillation stage (3), both distillation stages being arranged side by side and being separated from each other by a vertical wall (4), and that the bottom (7) of the first distillation stage (2) is connected with the bottom (10) of the second distillation stage (3).

REFERENCES:
patent: 2031336 (1936-02-01), Van Tonningen
patent: 2149943 (1939-03-01), Smith
patent: 4629534 (1986-12-01), Ezell
patent: 5200040 (1993-04-01), Naka et al.
patent: 6077985 (2000-06-01), Stork
patent: 6558515 (2003-05-01), Steacy

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