Catalytic dehydration of lactic acid to acrylic acid over sulfate catalysts

Authors

  • Jinfeng Zhang,

    1. Institute of Bioengineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China
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  • Jianping Lin,

    Corresponding author
    1. Institute of Bioengineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China
    • Institute of Bioengineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China.
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  • Peilin Cen

    1. Institute of Bioengineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, PR China
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Abstract

The production of acrylates from biomass-originated lactic acid is of extraordinary importance to overcome the increasing worldwide shortage of petroleum. In this work, the catalytic dehydration of lactic acid to acrylic acid was carried out over calcium sulfate catalyst with cupric sulfate and phosphates as promoters. The mass ratio of m(CaSO4)/m(CuSO4)/m(Na2HPO4)/m(KH2PO4) is 150.0:13.8:2.5:1.2. In the dehydration of lactic acid, effects of carrier gas, calcination temperature for catalyst, concentration of lactic acid as well as contact time are discussed in detail. With carbon dioxide as carrier gas, the highest acrylic acid yield of 63.7% is achieved from 26 wt.% lactic acid at 330°C and 88 s contact time.

Abstract

La production des acrylates à partir d'acide lactique issu de biomasse est d'une extrême importance compte tenu du manque croissant de pétrole dans le monde. Dans ce travail, la déshydratation catalytique de l'acide lactique en acide acrylique a été effectuée sur un catalyseur de sulfate de calcium avec du sulfate cuprique et des phosphates comme promoteurs. Les rapports de masse de m(CaSO4), m(CuSO4), m(Na2HPO4), m(KH2PO4) sont de 150,0, 13,8, 2,5 et 1,2, respectivement. Dans la déshydratation de l'acide lactique, les effets du gaz porteur, de la température de calcination du catalyseur, de la concentration de l'acide lactique ainsi que du temps de contact sont examinés en détail. Avec le dioxyde de carbone comme gaz transporteur, le rendement en acide acrylique le plus élevé obtenu est de 63,7%, à partir d'acide lactique à 26% massique, 330°C et un temps de contact de 88 secondes.

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