アセトニトリルの流動化合成-1・2-

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A method of preparation of alumina catalyst suitable for the synthesis of acetonitrile from acetylene and ammonia in fluidized bed and the activity of the catalyst was investigated. A quartz reaction tube of the diameter 1.5 inch was used and the grain size of the catalyst was 100-200 mesh. Under a definite fluidized synthetic condition, nearly equal catalytic activity was obtained in spite of the differences in the method of preparation of alumina, and when the catalyst prepared by addition of 3-4 wt% of Na<SUB>2</SUB>CO<SUB>3</SUB> according to Murakami, Shiba etc, was used, the side reaction such as formation of pyridine base and hydrogen cyanide and another decomposition reaction was prevented, the selectivity for acetonitrile being increased. The activity of two kinds of alumina catalyst prepared by addition of alkali before or after calcining of aluminum hydroxide became nearly equal after repetition of reaction. This can explaine well that the effective site of activity for synthesis of acetonitrile is on the outer surfaceof the catalyst. The regeneration of catalyst prepared by addition of optimum amount of sodium carbonate is made easily by treatment with air at the same temperature range as at the synthesis.
社団法人有機合成化学協会の論文