| 摘要 |
1438806 Unsaturated carboxylic acids MITSUBISHI RAYON CO Ltd 23 Oct 1973 49354/73 Heading C2C [Also in Division B1] Unsaturated carboxylic acids, e.g. acrylic or methacrylic acids are produced by the gas phase oxidation of unsaturated aldehydes with molecular oxygen at 240-390‹ C. in the presence of a catalyst in the form of an oxidic complex of formula P a Mo b As c (NH 4 ) d X e Z f O g wherein: X is V, W, Cu, Fe, Mn and/or Sn; Z is alkali metal; a =0.03 to 0.2; b=1; c=0-015 to 0.15; d=0.01 to 0.3 ; e = 0.003 to 1; f=0 to 0.17; and g has a value to satisfy valency requirements. Specified aldehyde feeds are acrolein and methacrolein (the latter suitably having been obtained by catalytic oxidation of isobutylene or tertbutanol). Suitably, the reaction mixture contains 1 to 20% vol. of aldehyde and a mole ratio of oxygen to aldehyde of 0.3 to 4 and is fed at a space velocity of 300-10,000 hr.<SP>-1</SP> under a pressure of atmospheric or above. |
