Abstract: The present invention relates to a process for producing an optically active aldehyde (first aldehyde) containing a reduced amount of the corresponding enantiomeric aldehyde (second aldehyde) which process comprises: (1) providing an initial solution containing a non-eutectic mixture of the first aldehyde and the second aldehyde, which mixture has a composition in the compositional region where only the first aldehyde crystallizes when its solubility limit in the solution is exceeded, and (2) maintaining the solution at a temperature above the eutectic temperature of the mixture and under conditions such that the solubility limit of the first aldehyde is exceeded so as to form a crystalline first aldehyde containing relatively less of the second aldehyde than was present in the initial solution.

Abstract: This invention relates to a method for removing halides from liquid carboxylic acid contaminated with a halide impurity by contacting the liquid halide-contaminated acid with a silver(I)-exchanged macroreticular resin. The halide reacts with the resin-bound silver and is removed from the carboxylic acid stream. The present invention also relates to an improved method for producing silver-exchanged macroreticular resins suitable for use in the present invention.

Abstract: A process for producing acrylic ester by the catalytic esterification of a crude liquid stream of enriched acrylic acid recovered by the partial condensation of the reaction gas effluent from the catalytic oxidation of propylene and/or acrolein. The partial condensation allows a significant proportion of volatile aldehydes and water to pass through the first recovery stage to a second stage for conventional recovery, along with uncondensed acrylic acid vapors and the remainder of the uncondensed reaction gases.