Column for concentrating phthalic anhydride
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United States of America Patent
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Apr 26, 2005
Grant Date -
Jul 24, 2003
app pub date -
Jan 21, 2003
filing date -
Jan 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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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).
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