Purification of crude (meth) acrylic acid
AssigneeBASF SE
InventorsToni Dockner, Gerhard Nestler, Holger Herbst, Helmut Lermer, Hans Martan, Herbert Vogel, Herbert Exner
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Abstract
Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.
Claims6
A process for purifying a (meth)acrylic acid contaminated with aldehydes which consists essentially of adding jointly to the (meth)acrylic acid contaminated with aldehydes both a hydrazine and/or a derivative thereof, and at least one organic sulfonic acid and/or one of its salts, and thereafter separating the (meth)acrylic from the resulting mixture by distillation, whereby the resulting (meth)acrylic is substantially free of the aldehydes and the formation of undesirable deposits during the distillation is substantially suppressed.
Dependencies are inferred from the claim text.