気相接触反応によるα-およびγ-ピコリンの合成-1-

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In order to make a simultaneous synthesis of α-and γ-picolines, the above reaction was carried out by use of silica-alumina catalyst. The products, besides the above expected compounds, contained a small amount of pyridine with traces of A-picoline and ethylamine. It was also recognized the formation of large amount of big hboiling pyridines, aldehyde condensation products, carbon aceous sudstances and gaseous decomposition products. The reacting conditions were investigated. It was found that the recycling of aldehyde raw material was not favorable, and that the deposition of carbonaceous substance on the catalyst caused rapid decrease in its selectivity to make it necessary to be regenerated frequently. The theoretical yield from aldehyde was 20 mol% of α-picoline, 23 mol % of γ-picoline, 10 mol % of high boiling pyridines at the reacting temperature of 450°c for 7 hr with space velocity 0 .19 g, ald./ml, cat?hr and ammonia 200% excess (against paraldehyde)
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