| 摘要 |
1,132,020. Unsaturated carboxylic acids. NIPPON KAYAKU K.K. 6 Dec., 1965 [7 Dec., 1964; 14 Oct., 1965], No. 51596/65. Heading C2C. [Also in Division B1] Acrolein or methacrolein are oxidized to corresponding unsaturated carboxylic acids in the presence of a catalyst of the empirical formula wherein a is 0 to 20, b is 0 to 15, a+b equals 2 to 20, c is 0À1 to 7, d is 0À1 to 4, e is 0À1 to 2, f is about 12 and g is 35 to 85. The oxidation is carried out in the vapour phase at from 250‹ to 450‹ C., at a pressure of 0À5 to 10 atmospheres absolute, with air or oxygen, or a mixture thereof, and optionally in the presence of steam. The catalyst may be supported on a carrier, e.g. silica, silicon carbide, alumina or boron phosphate. |
