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US 5,961,790 AGranted
Separation of (meth) acrylic acid by rectification
AssigneeBASF SE
InventorsHolger Herbst, Gerhard Nestler, Jerry Darlington, Ulrich Hammon
Life of this patent
Estimating the term…
Abstract
A process for the separation by rectification of (meth)acrylic acid from a mixture containing (meth)acrylic acid and an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid as main constituents and also lower aldehydes as secondary constituents, a primary amine and/or a salt thereof are added.
Claims2
A process for the separation of (meth)acrylic acid from a mixture comprising the step of:
- rectifying a mixture comprising (meth)acrylic acid, an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid, comprising diphenyl ether and/or a mixture thereof, and lower aldehydes, in the presence of a primary amine and/or a salt thereof,
- wherein (meth)acrylic acid is separated from said inert hydrophobic liquid and said lower aldehydes;
- and
- wherein rectification is performed in a rectification column and said primary amine and/or salt thereof is not added directly to said rectification column.
1 more element
A process for the separation of (meth)acrylic acid from a mixture comprising the step of:
- rectifying a mixture comprising (meth)acrylic acid, an inert hydrophobic organic liquid having a boiling point higher than that of (meth)acrylic acid, comprising diphenyl ether and/or a mixture thereof, and lower aldehydes, in the presence of a primary amine and/or a salt thereof, which is carried out continuously and in which the amine is added to the rectification column directly below the outlet point for the (meth)acrylic acid;
- and
- wherein (meth)acrylic acid is separated from said inert hydrophobic liquid and said lower aldehydes.
Dependencies are inferred from the claim text.