Appeal No. 2003-0849
Application 09/622,916
THE INVENTION
The Appellants’ invention relates to a process for the rectificative isolation of
acrylic or methacrylic acid from a mixture. The mixture contains acrylic or
methacrylic acid, as main components, and an organic liquid having a boiling point
higher than acrylic or methacrylic acid. The rectification is carried out with the
addition of a surfactant. (Brief, p. 2). Claims 1 and 10 are illustrative:
1. A process for the rectificative isolation of acrylic or methacrylic acid
from a mixture containing, as main components, acrylic or methacrylic
acid and an organic liquid having a higher boiling point than said
acrylic or methacrylic acid, wherein the rectification is carried out with
the addition of a surfactant.
10. A process for the preparation of acrylic or methacrylic acid by catalytic
gas-phase oxidation of a C3-/C4-starting compound, in which the
reaction gas mixture of the gas-phase oxidation is passed in
countercurrent to a descending high-boiling point inert hydrophobic
organic liquid in an absorption column, the liquid discharge of the
absorption column is then stripped with inert gas in a desorption
column and said acrylic or methacrylic acid is isolated from the liquid
discharge of the desorption column by rectification, wherein the
rectificative isolation is carried out with the addition of a surfactant.
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