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Featured researches published by Arne Pietsch.


Separation and Purification Technology | 1998

Basic investigation of integrating a membrane unit into high-pressure decaffeination processing

Arne Pietsch; W. Hilgendorff; O. Thom; Rudolf Eggers

Abstract Within the large-scale industrial decaffeination processes using supercritical CO 2 , caffeine is stripped from the extracting agent CO 2 with water using a high-pressure washing tower. On account of the value of the product, the caffeine is recovered from the washwater with a distillation–crystallization process. A reverse osmosis membrane process appears to be very suitable to replace the energy consuming distillation step to recover the caffeine and supply a cleaned water stream to be returned to the washing tower. Although this combination of a membrane process with high-pressure extraction was suggested earlier, very little fundamental work and experimental data have been published so far. The presented study is concentrated on basic investigations of this process. The osmotic pressure of aqueous caffeine solutions was determined with cryoscopy and additional membrane experiments. Membrane test cells were used to study the maximum separation of binary caffeine–water solutions. The influence of temperature, pressure and caffeine concentration on membrane flow and rejection was investigated for commercially available RO flat sheet membranes. The results show that RO concentration of aqueous caffeine solutions is feasible with moderate pressures and temperatures up to 60°C. Additional experiments with a non-optimized plate module supplemented the investigation of separation performance with approximately 50% of the test cell flux. Flux measurements with an agitated membrane cell show that the permeation of water with high CO 2 concentrations impairs membrane performance. A reverse osmosis washwater recycling process should flash the washwater to atmospheric pressure before the membrane unit.


Separation and Purification Technology | 2008

Gas assisted oilseed pressing

S. Voges; Rudolf Eggers; Arne Pietsch


European Journal of Lipid Science and Technology | 2007

Concentration of squalene from shark liver oil by short‐path distillation

Arne Pietsch; P. Jaeger


Journal of Supercritical Fluids | 1999

THE MIXER-SETTLER PRINCIPLE AS A SEPARATION UNIT IN SUPERCRITICAL FLUID PROCESSES

Arne Pietsch; Rudolf Eggers


Procedia food science | 2011

Gas-assisted oilseed pressing - Design of and tests with a novel high-pressure screw press

Arne Pietsch; Rudolf Eggers


Archive | 2002

High pressure spray extraction of liquids, to yield e.g. tocopherol-rich products, involves countercurrent extraction with gas having density very different from that of liquid

Rudolf Eggers; Arne Pietsch; P. Jaeger


Journal of Petroleum Science and Engineering | 2009

Characterization of reservoir systems at elevated pressure

P. Jaeger; Arne Pietsch


Chemie Ingenieur Technik | 2006

Gasunterstützte Ölsaat‐Pressung

S. Voges; Rudolf Eggers; Arne Pietsch


European Journal of Lipid Science and Technology | 2014

Gas assisted pressing on pilot scale

Marcus Müller; Arne Pietsch; Rudolf Eggers


Procedia food science | 2011

A basic investigation on instant coffee production by vacuum belt drying

Katrin Burmester; Arne Pietsch; Rudolf Eggers

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Rudolf Eggers

Hamburg University of Technology

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P. Jaeger

Hamburg University of Technology

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S. Voges

Hamburg University of Technology

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Katrin Burmester

Hamburg University of Technology

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Marcus Müller

Hamburg University of Technology

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O. Thom

Hamburg University of Technology

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P. Zacchi

Hamburg University of Technology

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