Selective Hydrogenation of Phenylacetylene and Influence of Mass Transfer.

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  • フェニルアセチレンの選択水添における物質移動の影響
  • フェニル アセチレン ノ センタク スイテン ニ オケル ブッシツ イドウ ノ

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Abstract

Phenylacetylene (PA) damages the quality of styrene. There are small amounts of PA in styrene which comes from extraction of C 8 distillate in or ethylene plant and from dehydration of ethylbenzene. There is about 34 mol/m3 of PA in C 8 distillate in the former process and we have to reduce the concentration of PA lower than 0.10 mol/m3 by hydrogenation over a Pd catalyst. But severe hydrogenation would convert styrene to ethylbenzene. We proposed a kinetic model for the gas and liquid upflow fixed bed differential reactor. The mass transfer coefficent of PA between the solid-liquid interface, which was observed in the experiments of the differential reactor, agreed well with the theoretical one. According to this model, larger Kφ favored higher ST selectivity. Experimental results of an integral reactor were in good accordance with the proposed model., if we introduced a backmixing model.

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