Abstract
The liquid phase hydrogenation of 2-ethylhexanal was carried out with the nickel-kieselguhr catalyst under the high pressure of hydrogen to identify the by-products, and to investigate the effects of the reaction conditions and some additives on the side-reaction.It was confirmed that 2-ethylhexanal (di-2-ethylhexyl) acetal was produced during 2-ethylhexanal hydrogenation and the yield of the acetal increased during the hydrogenation up to a maximum value at a point of 60∼70% conversion of aldehyde, and then decreased.The yield of bis-(2-ethylhexyl)ether increased with increase in the reaction temperature, that of the acetal decreasing. This reason was discussed in the paper. This side-reaction was promoted by acids contained in 2-ethylhexanal, but was supressed by water.
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