Production of acrolein and/or acrylic acid involves two stage catalytic oxydehydrogenation of propane, using modified air with less nitrogen and more oxygen than normal air as the oxygen source

摘要

In the production of acrolein and/or acrylic acid from propane, the oxygen required in reaction stage 1 (catalytic dehydrogenation to propene) is supplied as nitrogen-containing modified air containing less N2 and more O2 than normal air and some of the N2 in the stage 1 product is removed before this product is used in further stages (propene oxidation). A process for the production of acrolein (AC) and/or acrylic acid (AA) from propane, involving (1) partial oxydehydrogenation to propene with molecular oxygen using homogeneous and/or heterogeneous catalysts and (2) catalytic gas-phase oxidation of the propene-containing product gas in further stage(s) to give AC and/or AA. In this process, the molecular oxygen required in stage 1 (other than circulating oxygen) is added to the starting gas mixture in the form of nitrogen-containing modified air with a lower N2 content and a higher O2 content than normal air, and at least some of the molecular N2 in the product mixture from stage 1 is removed before this mixture is used in stage(s) 2.