PREPARATION METHOD OF HIGHLY PURE ACETONITRILE BY CONTACTING CRUDE ACETONITRILE WITH SULFURIC ACID

摘要

PURPOSE: Provided is a method for preparing a highly pure acetonitrile by effectively removing the impurities showing a maximum absorption at a wavelength of about 250 nm such as an allyl alcohol, an oxazole, etc. generated in the preparation of acrylonitrile or methacrylonitrile by ammoxidation. CONSTITUTION: The method comprises the steps of contacting the acetonitrile containing impurities with sulfuric acid; distilling it; and treating it with an adsorbent. Preferably the adsorbent comprises an acidic cation exchange resin having a carboxyl group or a sulfonic acid group.