Process for decolorizing cyclopropanecarboxylic acid
AssigneeEastman Chemical Company
InventorsShaowo Liang, Timothy W. Price
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for the conversion of off-color cyclopropanecarboxylic acid (CPC-Acid) to CPC-Acid having a color value (platinum-cobalt scale) of less than about 10 by the steps of (1) heating off-color CPC-Acid produced by the oxidation of cyclopropanecarboxaldehyde with molecular oxygen with a strong acid; and (2) distilling the mixture of step (1) to obtain CPC-Acid having a color value of less than about 10 as the distillate product.
Claims5
Process for the conversion of off-color cyclopropane-carboxylic acid (CPC-Acid) to CPC-Acid having a platinum-cobalt scale (PCS) color value of less than about 10 by the steps of:
- (1) heating off-color CPC-Acid produced by the oxidation of cyclopropanecarboxaldehyde with molecular oxygen with a strong acid;
- and
- (2) distilling the mixture of step (1) to obtain CPC-Acid having a color value of less than about 10 PCS as the distillate product;
- wherein the color values are measured by ASTM Procedure D 1209.
Process for the conversion of off-color cyclopropane-carboxylic acid (CPC-Acid) having a color value of about 20 to 800 to CPC-Acid having a color value of less than about 10 by the steps of:
- (1) heating the off-color CPC-Acid produced by the oxidation of cyclopropanecarboxaldehyde with molecular oxygen with about 0.1 to 5 weight per cent, based on the weight of the CPC-Acid present, of a polymeric sulfonic acid;
- and
- (2) distilling the mixture of step (1) to obtain CPC-Acid having a color value of less than about 10 as the distillate product;
- wherein the polymeric sulfonic acid is separated from the CPC-Acid prior to step (2) and the color values are measured by ASTM Procedure D 1209.
Dependencies are inferred from the claim text.