石油学会誌

The Vapour phase oxidation of methacrolein to methacrylic acid was investigated over a Mo-Co catalyst. After studying various problems in the preparation of Co-precipitated catalyst, investigations on the effect of the feed gas composition and contact time were carried out with the suitable catalyst obtained.
The suitable catalyst was prepared by Co-precipitation from aq. solution of cobalt nitrate and ammonium molybdate by addition of ammonia at 40°C and pH 5.0, followed by calcination of the precipitate for 5hrs. At the temperature of 500°C. The product was then kneaded with water, dried in the air bath for two hrs. and the resulting catalyst cake was finally ground into fine powder.
By passing a mixture consisting of 5.0% methacrolein, 10∼12% oxygen and 30% steam, over a portion of the suitable catalyst prepared as described above, at the temperature ranging from 380 to 405°C, and contact time of about 1.0sec, the following results were obtained. The conversion of methacrolein was 25 to 39%, the selectivity to methacrylic acid 70 to 80%, and its yield 20 to 27%.

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A large number of binary vapor-liquid equilibrium data have been reported. However, most of them are at over room temperature and some data at cryogenic temperature are reported recently, while there are little data reported at the low temperature ranging from 0 to -100°C, which is comparatively easy to obtain.
The vapor-liquid equilibrium of the binary system of similar light-hydrocarbons usually has small relative volatirities, but they increase as temperature decreases and hence distillation at low temperature becomes more important.
Authors have investigated isothermal vapor-liquid equilibrium of the propylene propane system at low temperatures -33.8°, -39.7°, -44.5° and -49.4°C, using vapor-liquid equilibrium measurement equipment of vapor phase forced circulation type.
We have obtained results which are thermodynamically consistent with the Redlich and Kister's method. The value of relative volatility increases as temperature decreases, but the degree of increase in the propylene rich range is not so large as that in the propane rich region.
Van Laar constants A and B were determined and compared with the values of Reamer & Sage and Hanson et al.

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