Eurotechnica GmbH

Bargteheide, Germany

Eurotechnica GmbH

Bargteheide, Germany
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Ivanovic J.,University of Belgrade | Knauer S.,Eurotechnica GmbH | Fanovich A.,CONICET | Milovanovic S.,University of Belgrade | And 4 more authors.
Journal of Supercritical Fluids | Year: 2015

The potential of supercritical carbon dioxide (scCO2) processing of polycaprolactone (PCL) and polycaprolactone-hydroxyapatite (PCL-HA) composites for obtaining functional porous scaffolds at moderate temperatures (35-40°C) was analyzed and quantified. The effect of scCO2 sorption kinetics on the swelling, foam morphology and thermal behavior of the PCL and PCL-HA composites was studied. Sorption isotherms were determined using magnetic suspension balance at 10-30MPa and 35-40°C. Influence of the pressure, HA amount (10-20%) and procedure for HA powder preparation on the sorption kinetics was discussed. Supercritical solvent impregnation (SSI) of PCL and PCL-HA with thymol was investigated as environmentally friendly way to produce functional scaffolds with controlled microstructure. Moderately high pressures (13-17MPa) and 10% of HA were proven to be favorable for creation of the PCL scaffolds with satisfying foam microstructure (mean pore size ~200-300μm), filler distribution and thymol impregnation yields (12-18%). This was due to the satisfactory high scCO2 solubility (0.25-0.30g/g) and mass transfer rate (~10-10 m2/s) in the polymer phase as well as its great plasticizing effect (-δT m =26.4-27.4°C). Higher saturation of the polymer phase with scCO2 (0.30-0.55g/g), filler amount (20%) and thymol solubility in scCO2 (>5.5g/kg) at pressures above 20MPa resulted in decreased mass transfer rate and SSI efficiency. © 2015 Elsevier B.V.


Ivanovic J.,University of Belgrade | Knauer S.,Eurotechnica GmbH | Fanovich A.,CONICET | Milovanovic S.,University of Belgrade | And 4 more authors.
Journal of Supercritical Fluids | Year: 2016

The potential of supercritical carbon dioxide (scCO2) processing of polycaprolactone (PCL) and polycaprolactone-hydroxyapatite (PCL-HA) composites for obtaining functional porous scaffolds at moderate temperatures (35-40 °C) was analyzed and quantified. The effect of scCO2 sorption kinetics on the swelling, foam morphology and thermal behavior of the PCL and PCL-HA composites was studied. Sorption isotherms were determined using magnetic suspension balance at 10-30 MPa and 35-40 °C. Influence of the pressure, HA amount (10-20%) and procedure for HA powder preparation on the sorption kinetics was discussed. Supercritical solvent impregnation (SSI) of PCL and PCL-HA with thymol was investigated as environmentally friendly way to produce functional scaffolds with controlled microstructure. Moderately high pressures (13-17 MPa) and 10% of HA were proven to be favorable for creation of the PCL scaffolds with satisfying foam microstructure (mean pore size ∼200-300 μm), filler distribution and thymol impregnation yields (12-18%). This was due to the satisfactory high scCO2 solubility (0.25-0.30 g/g) and mass transfer rate (∼10-10 m2/s) in the polymer phase as well as its great plasticizing effect (-ΔTm = 26.4-27.4 °C). Higher saturation of the polymer phase with scCO2 (0.30-0.55 g/g), filler amount (20%) and thymol solubility in scCO2 (>5.5 g/kg) at pressures above 20 MPa resulted in decreased mass transfer rate and SSI efficiency. © 2015 Elsevier B.V. All rights reserved.


Jaeger P.T.,Eurotechnica GmbH | Alotaibi M.B.,Texas A&M University | Nasr-El-Din H.A.,Texas A&M University
Journal of Chemical and Engineering Data | Year: 2010

The application of carbon dioxide is becoming increasingly important for enhanced oil recovery (EOR) processes. In view of combined EOR and carbon dioxide capture and storage technologies (CCS), knowledge must be gained on relevant properties of the participating fluid mixtures. The solubility of carbon dioxide is significant in many hydrocarbon materials, which affects the capillarity and migration of fluids in oil reservoirs via the interfacial tension (IFT) and wetting of the rock surfaces. For EOR the capillarity is decisive in view of the pressure that has to be overcome within the rock pores. The present study is dedicated to a thorough experimental description of a gas-crude oil-reservoir water system and its behavior under CO 2 pressure including oil density and interfacial properties. The experimental results of decreasing IFT in a three-phase system, increasing density and diminishing wettability, show an important influence of the presence of carbon dioxide. © 2010 American Chemical Society.


Amro M.,TU Bergakademie Freiberg | Freese C.,TU Bergakademie Freiberg | Finck M.,Eurotechnica GmbH | Jaeger P.,Eurotechnica GmbH
SPE Middle East Oil and Gas Show and Conference, MEOS, Proceedings | Year: 2015

Success of EOR depends on the interaction of the flooding fluids with the hydrocarbon liquid - gas mixtures under reservoir conditions especially accounting for interfacial and flow behavior. CO2 is becoming increasingly involved in miscible flooding procedures for which there is a growing interest in the respective system properties. In the current work, experimental data on interfacial tension are presented for the binary systems n-heptane, n-decane and crude oil - CO2 and the ternary systems n-heptane, n-decane and crude oil - brine - CO2 at pressures up to 30 MPa and temperatures of up to 400 K. In case of a crude oil in contact with CO2, the interfacial tension is significantly decreased as the pressure rises. Above 20 MPa the interfacial tension maintains a low but relatively constant level at around 2 mN/m. The pressure dependant influence of CO2 on the interfacial tension is compared to nitrogen and methane. For liquid - liquid systems in presence of a fluid like CO2 that is partly miscible with both adjacent liquid phases, there is a reducing effect on the interfacial tension which can be correlated with the diffusion and subsequent accumulation of the gas at the liquid - liquid interface. In the presence of hydrocarbon gases like methane this effect is negligible because of merely non-polar interactions. While the interfacial tension is decisive regarding capillary action especially within the micro pores, the viscosity determines the resistance to flow of the bulk phase, i.e. of the crude oil through the main ducts. As a consequence, reduction in viscosity is essential for improving oil recovery by use of a displacing fluid. Further, the viscosity ratio between the flooding fluid and the oil determines efficiency of the recovery method. In miscible flooding using CO2, the low viscosity ratio represents a challenge. On the other hand, high solubility of the gas within the liquid phase leads to reducing its viscosity by orders of magnitude. This effect is determined by a procedure recently developed and shown in this paper using n-alkanes for calibration and giving some exemplary results for the crude oil - CO2 system. A main difficulty is related to working close to gas saturation within the liquid phase. Copyright 2015, Society of Petroleum Engineers.


Amro M.,TU Bergakademie Freiberg | Finck M.,Eurotechnica GmbH | Jaeger P.,Eurotechnica GmbH
SPE Middle East Oil and Gas Show and Conference, MEOS, Proceedings | Year: 2015

Recently CO2- and N2-foams attract increased interest in EOR, especially considering the enhanced recovery of heavy crude oils. Since foams contain a liquid as well as a gas phase, different fluid properties are combined that may be taken advantage of regarding miscible and immiscible flooding, pressure increase and flow through pores of different sizes. Gas released from foam bubbles may dissolve within the crude while the aqueous, surfactant-containing continuous phase displaces the crude being reduced in viscosity simultaneously. In the current work, experimental data on foam stability and structure of CO2- and N2-foams are presented at pressures up to 10 MPa and temperatures up to 320 K. The knowledge of interfacial phenomena, density, viscosity and miscibility provides a basis to understand the interaction between the tree phases and the advantages over other EOR-methods. The pressure dependence of foam stability and structure shows the importance of experimental research on foams at reservoir conditions. There for a new developed high pressure foam analysis-system is presented. CO2- and N2-foams especially differ in stability because the CO2 dissolves within the draining film to a higher extent. As a consequence, gas permeation between adjacent bubbles is strongly enhanced. In addition, CO2 exerts an extraction effect on the surfactants: their concentration is reduced in the film phase leading to a decreasing viscoelasticity and hence destabilizing the foam film. Although the high interaction potential of CO2 leads to an improved demand on extensive research on stabilizing CO2-foams by adding additives like co-surfactants, the positive effects of this high interaction potential is a desirable property in EOR. Thereby the foam acts as a carrier system reducing the undesirable high mobility of the CO2. Compared to CO2-foams, N2-foams are easily handled and can be used in different application areas in immiscible EOR. Copyright 2015, Society of Petroleum Engineers.

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