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The unit was built by Zeton BV, in the Netherlands and was commissioned in 2005. It comprises of 4 isothermal trickle bed reactors running in parallel..

Unit Description


Liquid feed material may be loaded into 4 separate feed tanks. Tuthill circulation pumps are employed to ensure feed homogeneity. The feed tanks are well insulated and are kept under a positive pressure of 0.7 barg. In addition the Tuthill pump is used to charge the four HPLC Gilson pumps. The feed is then introduced into the reactor system with the aid of the high precision HPLC Gilson pumps.


Hydrogen is fed into the reactors via high pressure Tescom gas regulators. The gas flow is controlled by Brooks mass flow meters.

The gas and liquid is co currently fed in the reactor system. The flow pattern in the reactor may be described as down flow.

The reactor exit pressure is regulated by Mighty Mite pressure control valves.

The gas stream is separated from the liquid stream in the low-pressure stripper/ separator, which is run at 3.5 barg. Nitrogen is introduced into the stripper at a rate of 30 sl/h (or 1500 sl/l) in order to ensure the proper separation of Hydrogen Sulphide and Ammonia from the liquid product.

The off gas from the low-pressure separator proceeds to a Zinc Oxide scrubber whereas the liquid product enters the automatic sample collection system.

AU 160 process specifications

  Number of reactors 4 in parallel
  Number of furnaces 4
  Total reactor volume 300 ml
  Reactor diameter 17.5 mm
  Reactor length 1200 mm
  Operating pressure 2 - 165 barg
  Operating temperature 20 - 425 C
  Liquid Feed Rate 10 - 180 ml/h
  Gas Rate 0 - 70 sl/h

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