PREPARATION OF C3-C5.ALPHA., .BETA.-MONOETHYLENICALLY UNSATURATED ALDEHYDES, CARBOXYLIC ACIDS, OR NITRILES

摘要

Preparation of C3-C5 .alpha.,.beta.-Monoethylenically Unsaturated Aldehydes, Carboxylic Acids, or Nitriles of the disclosure A process for the preparation of C3-C5 .alpha.,.beta.-monoethylenically unsaturated aldehydes, carboxylic acids, or nitriles by catalytic gas phase oxidation or gasphase ammonoxidation of a reduced form of the desired compound in multipletube reactor charged with catalytically active multimetal oxide, in which the volume-based activity of the catalytic charge decreases along the catalyst tubes in the direction of flow abruptly, in step, and/or continuously.