Process for preparing perpropionic acid solution
AssigneeUbe Industries, Ltd.
InventorsYukio Inaba, Takafumi Hirakawa, Yohsuke Ueno, Suzuo Takiguchi
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Abstract
A process for preparing perpropionic acid solution comprising reacting propionic acid with hydrogen peroxide in the presence of a boric acid catalyst wherein the reaction is carried out by using an ethyl propionate as a reaction solvent, and water in the reaction solution is removed continuously by azeotropic distillation with the reaction solvent. Since the reaction is carried out while the concentration of the peroxide in an aqueous phase separated from the distillate by the azeotropic distillation is maintained at not more than 0.1% by weight, a perpropionic acid solution containing almost no unreacted hydrogen peroxide can be prepared.
Claims25
A process for preparing perpropionic acid solution comprising (a) reacting propionic acid with hydrogen peroxide in the presence of a boric acid catalyst, at least one stabilizer selected from the group consisting of picolinic acid, dipicolinic acid, 2-picoline, rutidine and an N-oxide thereof, and a reaction solvent to form a reaction solution, wherein the reaction solvent is ethyl propionate, (b) continuously removing water from the reaction solution by an azeotropic distillation with the reaction solvent, said azeotropic distillation resulting in a distillate comprising an aqueous phase and (c) maintaining a concentration of said peroxide in the aqueous phase of the distillate of not more than 0.1% by weight.
Dependencies are inferred from the claim text.