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CONNECTEDPLANT STORE BUYER'SGUIDE PLANTCOSTINDEX WEBINARS WHITEPAPERS JOBBOARD ARCHIVES ADVERTISE SUBSCRIBE ENVIRONMENT, COVID-19 PROCESSING & SEPARATION WATER HEAT SOLIDS AUTOMATION HEALTH, OPERATIONS & BUSINESS & WEFTEC HANDLING PROCESSES TREATMENT TRANSFER HANDLING & CONTROL SAFETY & MAINTENANCE ECONOMICS SECURITY HIGHLIGHTS Maintenance Tools FLOWSIC100 Flare-XT: Ultrasonic !are gas measurement (https://www.chemengonline.com/videos/!owsic100- !are-xt-ultrasonic-!are-gas-measurement-sick-ag/) FLOWSIC100 Flare-XT: Ultrasonic :are gas measuremen ... CURRENT ISSUE SEPARATION PROCESSES HIGHLIG PDF HTS SUPERCRITICAL CO2: A GREEN SOLVENT By Chemical Engineering | February 1, 2010 Many reactions, extractions, separations and other operations in the chemical process industries (CPI) involve the use of organic solvents. In addition to handling and disposal issues, organic solvents can pose a number of environmental concerns, such as atmospheric and land toxicity. In many cases, conventional organic solvents are regulated as volatile organic compounds (VOCs). In addition, certain organic solvents are under restriction due to their ozone-layer-depletion potential. Supercritical carbon dioxide is an attractive alternative in place of traditional organic solvents. CO2 is not considered a VOC. Although CO2 is a greenhouse gas, if it is withdrawn from the environment, used in a process, and then returned to the environment, it does not contribute to the greenhouse e!ect. There have been an increasing number of commercialized and potential applications for supercritical fluids. This article summarizes the fundamentals of supercritical CO2 properties and processing, and presents a number of current and potential applications. SUPERCRITICAL FLUIDS Above its critical values, a compound’s liquid-vapor phase boundary no longer exists and its fluid properties can be tuned by adjusting the pressure or temperature. Although supercritical fluid has liquid-like density, it exhibits gas- like di!usivity, surface tension and viscosity. Its gas-like viscosity results in high mass transfer. Its low surface tension and viscosity lead to greater penetration into porous solids. Because of its liquid-like density, a supercritical fluid’s solvent strength is comparable to that of a liquid. BREAKTHROUGH TECHNOLOGIES 72 SEARCH... NEW CATALYST FOR OXIDATIVE DEHYDROGENATION OF PROPANE TO PROPYLENE PROJECT AIMS TO ESTABLISH SUPPLY OF REES FROM WASTE STREAMS COMPRESSING HYDROGEN ELECTROCHEMICALLY BESPOKE BATTERY RECYCLINGPDF Image | SUPERCRITICAL CO2: A GREEN SOLVENT
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