Process for continuous hydrogenation or hydrogenating amination

  • US 8,163,963 B2
  • Filed: 10/16/2006
  • Issued: 04/24/2012
  • Est. Priority Date: 10/17/2005
  • Status: Expired due to Fees
First Claim
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1. A process for continuously hydrogenating unsaturated compounds, in whicha) particles of a first hydrogenation catalyst are suspended in a liquid phase in which an unsaturated compound is dissolved,b) the liquid phase, in the presence of a hydrogenous gas at a first partial hydrogen pressure and at a first temperature, is conducted through a packed bubble column reactor in cocurrent counter to the direction of gravity,c) the effluent from the bubble column reactor is sent to a gas-liquid separation,d) the liquid phase from step c) is sent to a crossfiltration to obtain a retentate and a filtrate,e) the retentate is recycled into step b),f) the filtrate, in the presence of a hydrogenous gas at a second partial hydrogen pressure and at a second temperature, is passed over a bed of a second hydrogenation catalyst.wherein the unsaturated compound is selected from the group consisting of cinnamaldehyde derivatives of the following formula (II)

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