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Featured researches published by Carsten Zetzl.


Separation Science and Technology | 2001

ADSORPTION AND DESORPTION OF M-XYLENE FROM SUPERCRITICAL CARBON DIOXIDE ON ACTIVATED CARBON

Jamal Benkhedda; Jean-Noël Jaubert; Danielle Barth; Carsten Zetzl; Gerd Brunner

The equilibrium loadings of m-xylene from supercritical carbon dioxide on activated carbon are reported. The experimental data were obtained by measuring the outlet concentration of m-xylene eluted from a column packed with activated carbon until the effluent reached the input concentration. The Freundlich isotherm expression was found to correlate the experimental data satisfactorily. In a second step, the regeneration by supercritical carbon dioxide of activated carbon loaded with m-xylene was investigated. The experimental data demonstrated that the adsorptive capacities of the regenerated activated carbon for m-xylene after many cycles were close to those of the virgin carbon and remained stable. The effects of temperature, pressure, and flow rate on regeneration efficiency were also studied.


Holzforschung | 2011

Development of an integrated thermal and enzymatic hydrolysis for lignocellulosic biomass in fixed-bed reactors

Christian Kirsch; Carsten Zetzl; Irina Smirnova

Abstract The limitations of the current biorefinery process utilizing stirred-tank reactors for the enzymatic step include poor mixing in the case of high biomass loadings, additional steps for the product separation, and a long reaction time. In this study the hydrothermal pretreatment and the enzymatic hydrolysis of the lignocellulosic biomass were combined in one fixed-bed reactor. The influence of the shear forces during recirculation and enzyme stability at elevated temperatures were investigated. It has been shown that the shear forces resulting from pumping have a negligible effect on enzyme activity. However, large pressure drops reduce the enzyme activity significantly. Furthermore, the enzyme stability was significantly increased at elevated temperatures (60°C) by applying static pressures up to 200 bar (56% residual activity at 60°C after 24 h). This is beneficial for the process as a higher temperature accelerates the reaction. Further improvement of the overall process efficiency was achieved by increasing the solid-to-water ratio and circulation of the enzyme solution. At a biomass content of 7%, a glucose concentration of 61 g l-1 and a yield of 85% was achieved. The integrated process was first done on a laboratory scale (50 ml). At 100 bar, 60°C and 10% biomass loading an increased initial reaction rate was observed. However, this effect was followed by the stagnation of the glucose yield as one of the enzymes, Novozyme 188, showed no remarkable stabilization with pressure. Nevertheless, an overall glucose yield of 40% was achieved after 5.5 h, compared to 14 h under normal pressure and 50°C.


euro mediterranean conference | 2017

Carotenoids-Rich Fatty Fractions Extraction from Tomato Industrial By-Products, Peels and Seeds, Using Supercritical CO 2 Green Technology

Mouna Kehili; Ayachi Zammel; Carsten Zetzl; Irina Smirnova; Noureddine Allouche; Sami Sayadi

Nowadays, with the expanding awareness about environmental safety, energy security and potential biomass recycling, much effort has been extended towards adding value to biowastes of agri-food industries. In this context, Tunisia was ranked among the first 10 countries in the world for the industrial transformation of tomatoes which resulted in large quantities of by-products, ranging between 20,000 and 30,000 tons per year.


Journal of Supercritical Fluids | 2008

From plant materials to ethanol by means of supercritical fluid technology

Christian Schacht; Carsten Zetzl; Gerd Brunner


Journal of Supercritical Fluids | 2012

Supercritical drying of aerogels using CO2: Effect of extraction time on the end material textural properties

C.A. García-González; M.C. Camino-Rey; M. Alnaief; Carsten Zetzl; Irina Smirnova


Journal of Agricultural and Food Chemistry | 2002

Extraction of methylxanthines from guaraná seeds, maté leaves, and cocoa beans using supercritical carbon dioxide and ethanol.

Marleny D. A. Saldaña; Carsten Zetzl; Rahoma S. Mohamed, ,† and; Gerd Brunner


Journal of Supercritical Fluids | 2005

A process line for the production of raffinated rice oil from rice bran

Leandro Danielski; Carsten Zetzl; Haiko Hense; Gerd Brunner


Journal of Supercritical Fluids | 2005

Global yield isotherms and kinetic of artemisinin extraction from Artemisia annua L leaves using supercritical carbon dioxide

Sócrates Quispe-Condori; Deny Sánchez; Mary Ann Foglio; Paulo de Tarso Vieira e Rosa; Carsten Zetzl; Gerd Brunner; M. Angela A. Meireles


Fluid Phase Equilibria | 2004

Adsorption isotherms for ethylacetate and furfural on activated carbon from supercritical carbon dioxide

Susana Lucas; Mª José Cocero; Carsten Zetzl; Gerd Brunner


Food Research International | 2005

Extraction of boldo (Peumus boldus M.) leaves with supercritical CO2 and hot pressurized water

J.M. del Valle; Tim Rogalinski; Carsten Zetzl; Gerd Brunner

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Gerd Brunner

Hamburg University of Technology

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Irina Smirnova

Hamburg University of Technology

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Christian Kirsch

Hamburg University of Technology

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Garabed Antranikian

Hamburg University of Technology

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Thomas Ingram

Hamburg University of Technology

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Wienke Reynolds

Hamburg University of Technology

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