Improved process for preparing p-aminobenzoic acid-2-ethylhexyl ester
AssigneeBASF SE
InventorsPeter LEIDINGER, Thomas BERG, Helmut KRONEMAYER, Sebastian EMMERLING, Joerg WERLE
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Abstract
The present invention relates to a process for preparing p-aminobenzoic acid-2-ethylhexyl ester comprising reacting p-nitrobenzoic acid-2-ethylhexyl ester with hydrogen in the presence of a catalyst, wherein the reaction is performed in water or in a mixture of water and 2-ethylhexanol. Further, the present invention relates to the p-aminobenzoic acid-2-ethyl hexylester obtained by the process and having high purity.
Claims14
-12. (canceled)
A process for preparing p-aminobenzoic acid-2-ethyl hexylester comprising reacting p-nitrobenzoic acid-2-ethyl hexylester with hydrogen in the presence of a catalyst, wherein the reaction is performed
- (a) in water;
- or
- (b) in a mixture of water and 2-ethylhexanol
- wherein the process comprises adding the water (a) or the mixture of water and 2-ethylhexanol to the reaction mixture at the beginning of the reaction.
A P-Aminobenzoic acid-2-ethyl hexylester having a purity of at least 94% by weight or 94% as determined by GC, wherein the amount of bis(2-ethylhexyl)-4,4′-(diazene-1,2-diyl)(E)-dibenzoate having the following chemical formula
- is less than 3000 ppm.
Dependencies are inferred from the claim text.