Extraction of sesame seed ( Sesamun indicum L.) oil using compressed propane and supercritical carbon dioxide

Extraction of canola seed ( Brassica napus) oil using compressed propane and supercritical carbon dioxide

Extraction of inflorescences of Musa paradisiaca L. using supercritical CO2 and compressed propane

Ginger (Zingiber officinale R.) extracts obtained using supercritical CO2 and compressed propane: Kinetics and antioxidant activity evaluation

'This report summarizes the results of work done during the first 1.3 years of a three year project. During the first nine months effort focussed on the design, construction and testing of a closed recirculating system that can be used to study photochemistry in supercritical carbon dioxide at pressures up to 5,000 psi and temperatures up to about 50 C. This was followed by a period of work in which the photocatalytic oxidation of benzene and acetone in supercritical, liquid, and gaseous carbon dioxide containing dissolved oxygen was demonstrated. The photocatalyst was titanium dioxide supported on glass spheres. This was the first time it was possible to observe photocatalytic oxidation in a supercritical fluid and to compare reaction in the three fluid phases of a solvent. This also demonstrated that it is possible to purify supercritical and liquid carbon dioxide using photochemical oxidation with no chemical additions other than oxygen. The oxidation of benzene produced no intermediates detectable using on line spectroscopic analysis or by gas chromatographic analysis of samples taken from the flow system. The catalyst surface did darken as the reaction proceeded indicating that oxidation products were accumulating on the surface. This is analogous to the behavior of aromatic compounds in air phase photocatalytic oxidation. The reaction of acetone under similar conditions resulted in the formation of low levels of by-products. Two were identified as products of the reaction of acetone with itself (4-methyl-3-penten-2-one and 4-hydroxy-4-methyl-2-pentanone) using gas chromatography with a mass spectrometer detector. Two other by-products also appear to be from the self-reaction of acetone. By-products of this type had not been observed in prior studies of the gas-phase photocatalytic oxidation of acetone. The by-products that have been observed can also be oxidized under the treatment conditions. The above results establish that photocatalytic oxidation of organic compounds in supercritical carbon dioxide can be achieved. Until recently it was not possible for us to obtain high quality, quantitative kinetic data. The original flow cell used to obtain UV-Visible spectra on the recirculating fluid did not provide quantitative concentration data because the sapphire windows did not have adequate transmission characteristics below about 240 nm. A pair of windows with better transmission properties arrived as this report was being prepared. While waiting for the replacement windows for the flow cell, the concentration of reactants was monitored by withdrawing samples of the fluid stream for gas chromatographic analysis. This allowed progress to be made in determining some of the factors that affected the rates of reaction in a qualitative sense but the results had large error bars due to the difficulty in obtaining reproducible samples from the pressurized system using gas tight syringes. This problem was recently solved by incorporating a gas chromatograph with automatic sampling valves into the flow system. The two on line analytical methods will now result in reliable analytical data that can be used to follow the reaction kinetics and detect and identify reaction intermediates and by-products, if any are formed.'

Preliminary Evaluation of Polymer-Based Drug Composite Microparticle Production by Coacervate Desolvation with Supercritical Carbon Dioxide

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of 1-Eicosanol and Eicosanoic Acid in Supercritical Carbon Dioxide from 308.2 to 328.2 K at Pressures to 21.26 MPaJun-Shun Yau and Fuan-Nan TsaiCite this: J. Chem. Eng. Data 1994, 39, 4, 827–829Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https://pubs.acs.org/doi/10.1021/je00016a042https://doi.org/10.1021/je00016a042research-articleACS PublicationsRequest reuse permissionsArticle Views116Altmetric-Citations18LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts

Extraction of citronella grass solutes with supercritical CO2, compressed propane and ethanol as cosolvent: Kinetics modeling and total phenolic assessment

Guariroba (Syagrus oleracea) kernel oil extraction using supercritical CO2 and compressed propane and its characterization

6 - Evaluation of Supercritical Fluid Interactions with Polymeric Materials

Extraction of sunflower ( Heliantus annuus L.) oil with supercritical CO 2 and subcritical propane: Experimental and modeling

Pepper (Piper nigrum L) volatile oil was extracted with supercritical fluid carbon dioxide at pressures of 8 and 10 MPa and at two different temperatures, 40°C and 60°C. The mass transfer rates are presented at different supercritical conditions of extraction, together with the fractionation effect that was observed. The volatile oil obtained was analysed for its physical constants: specific gravity, refractive index and optical rotation. The samples were fractionated by column chromatography, and both the samples and fractions were subjected to TLC, gas chromatography and sensory analysis. It was observed that pepper oil obtained with supercritical fluid carbon dioxide at 10 MPa and 60°C was superior to steam‐distilled oil.

Bubble-point measurement for the binary mixture of propargyl acrylate and propargyl methacrylate in supercritical carbon dioxide

Managing impure carbon dioxide produced by fossil fuel-based generation of electricity is required for successful implementation of carbon capture, utilization, and storage. Impurities in carbon dioxide, particularly SOx and NOx, are geochemically more reactive than the carbon dioxide and may adversely impact a carbon dioxide storage reservoir by generating additional acidity. Hydrothermal experiments are performed to evaluate geochemical and mineralogic effects of injecting SO2-CO2 fluid into a carbonate reservoir. The experimental design is based on a natural carbon dioxide reservoir, the Madison Limestone on the Moxa Arch of Southwest Wyoming, which serves as a natural analog for geologic cosequestration of sulfur dioxide and carbon dioxide. Idealized Madison Limestone (dolomite+calcite±anhydrite+pyrite) and Na-Cl-SO42− brine (I=0.5 molal, initial pH=8.5) reacted at reservoir conditions (110°C and 25 MPa) for approximately 165 days (3960 h). Carbon dioxide fluid containing 500 ppmv sulfur dioxide was injected and the experiment continued for approximately 55 days (1326 h). Sulfur dioxide partitions out of the supercritical carbon dioxide phase and dissolves into coexisting brine on the time scale of the experiments (55 days). Injecting supercritical SO2-CO2 or pure supercritical carbon dioxide into a brine-limestone system produces the same in situ pH (4.6) and ex situ pH (6.4–6.5), as measured 28 h after injection because dissolution of calcite buffers in situ pH. Precipitation of anhydrite sequesters injected sulfur and, coupled with dissolution of calcite, effectively buffers the amount of dissolved calcium to the same concentrations measured in limestone-brine experiments injected with pure carbon dioxide. Supercritical SO2-CO2 does not enhance the sequestration potential of a carbonate reservoir relative to pure supercritical carbon dioxide. Our results substantiate predictions from natural analog studies of the Madison Limestone that anhydrite traps sulfur and carbonate minerals ultimately reprecipitate and mineralize carbon in carbonate reservoirs.

Integration and conversion of supercritical carbon dioxide coal-fired power cycle and high-efficiency energy storage cycle: Feasibility analysis based on a three-step strategy

Foreword. Preface. List of Contributors. 1 Supercritical Carbon Dioxide for Sustainable Polymer Processes (Maartje Kemmere). 1.1 Introduction. 1.2 Strategic Organic Solvent Replacement. 1.3 Physical and Chemical Properties of Supercritical CO2. 1.4 Interactions of Carbon Dioxide with Polymers and Monomers. 1.5 Concluding Remarks and Outlook. 2 Phase Behavior of Polymer Systems in High-Pressure Carbon Dioxide (Gabriele Sadowski). 2.1 Introduction. 2.2 General Phase Behavior in Polymer/Solvent Systems. 2.3 Polymer Solubility in CO2. 2.4 Thermodynamic Modeling. 2.5 Conclusions. 3 Transport Properties of Supercritical Carbon Dioxide (Frederic Lavanchy, Eric Fourcade, Evert de Koeijer, Johan Wijers, Thierry Meyer, and Jos Keurentjes). 3.1 Introduction. 3.2 Hydrodynamics and Mixing. 3.3 Heat Transfer. 3.4 Conclusions. 4 Kinetics of Free-Radical Polymerization in Homogeneous Phase of Supercritical Carbon Dioxide (Sabine Beuermann and Michael Buback). 4.1 Introduction. 4.2 Experimental. 4.3 Initiation. 4.4 Propagation. 4.5 Termination. 4.6 Chain Transfer. 4.7 Conclusions. 5 Monitoring Reactions in Supercritical Media (Thierry Meyer, Sophie Fortini, and Charalampos Mantelis). 5.1 Introduction. 5.2 On-line Analytical Methods Used in SCF. 5.3 Calorimetric Methods. 5.4 MMA Polymerization as an Example. 5.5 Conclusions. 6 Heterogeneous Polymerization in Supercritical Carbon Dioxide (Philipp A. Mueller, Barbara Bonavoglia, Giuseppe Storti, and Massimo Morbidelli). 6.1 Introduction. 6.2 Literature Review. 6.3 Modeling of the Process. 6.4 Case Study I: MMA Dispersion Polymerization. 6.5 Case Study II: VDF Precipitation Polymerization. 6.6 Concluding Remarks and Outlook. 7 Inverse Emulsion Polymerization in Carbon Dioxide (Eric J. Beckman). 7.1 Introduction. 7.2 Inverse Emulsion Polymerization in CO2: Design Constraints. 7.3 Surfactant Design for Inverse Emulsion Polymerization. 7.4 Inverse Emulsion Polymerization in CO2: Results. 7.5 Future Challenges. 8 Catalytic Polymerization of Olefins in Supercritical Carbon Dioxide (Maartje Kemmere, Tjerk J. de Vries, and Jos Keurentjes). 8.1 Introduction. 8.2 Phase Behavior of Polyolefin-Monomer-CO2 Systems. 8.3 Catalyst System. 8.4 Polymerization of Olefins in Supercritical CO2 Using Brookhart Catalyst. 8.5 Concluding Remarks and Outlook. 9 Production of Fluoropolymers in Supercritical Carbon Dioxide (Colin D. Wood, Jason C. Yarbrough, George Roberts, and Joseph M. DeSimone). 9.1 Introduction. 9.2 Fluoroolefin Polymerization in CO2. 9.3 Fluoroalkyl Acrylate Polymerizations in CO2. 9.4 Amphiphilic Poly(alkylacrylates). 9.5 Photooxidation of Fluoroolefins in Liquid CO2. 9.6 CO2/Aqueous Hybrid Systems. 9.7 Conclusions. 10 Polymer Processing with Supercritical Fluids (Oliver S. Fleming and Sergei G. Kazarian). 10.1 Introduction. 10.2 Phase Behavior of CO2/Polymer Systems and the Effect of CO2 on Polymers. 10.3 Rheology of Polymers Under High-Pressure CO2. 10.4 Polymer Blends and CO2. 10.5 Supercritical Impregnation of Polymeric Materials. 10.6 Conclusions and Outlook. 11 Synthesis of Advanced Materials Using Supercritical Fluids (Andrew I. Cooper). 11.1 Introduction. 11.2 Polymer Synthesis. 11.3 Porous Materials. 11.4 Nanoscale Materials and Nanocomposites. 11.5 Lithography and Microelectronics. 11.6 Conclusion and Future Outlook. 12 Polymer Extrusion with Supercritical Carbon Dioxide (Leon P. B.M. Janssen and Sameer P. Nalawade). 12.1 Introduction. 12.2 Practical Background on Extrusion. 12.3 Supercritical CO2-Assisted Extrusion. 12.4 Mixing and Homogenization. 12.5 Applications. 12.6 Concluding Remarks. 13 Chemical Modification of Polymers in Supercritical Carbon Dioxide (Jesse M. de Gooijer and Cor E. Koning). 13.1 Introduction. 13.2 Brief Review of the State of the Art. 13.3 End-group Modification of Polyamide 6 in Supercritical CO2. 13.4 Carboxylic Acid End-group Modification of Poly(Butylene Terephthalate) with 1,2-Epoxybutane in Supercritical CO2. 13.5 Concluding Remarks and Outlook. 14 Reduction of Residual Monomer in Latex Products Using High-Pressure Carbon Dioxide (Maartje F. Kemmere, Marcus van Schilt, Marc Jacobs, and Jos Keurentjes). 14.1 Introduction. 14.2 Overview of Techniques for Reduction of Residual Monomer. 14.3 Enhanced Polymerization in High-Pressure Carbon Dioxide. 14.4 Extraction Capacity of Carbon Dioxide. 14.5 Process Design for the Removal of MMA from a PMMA Latex Using CO2. 14.6 Conclusion and Future Outlook. Subject Index.