22 research outputs found
Life Cycle Assessment of Rare Earth Elements-Free Permanent Magnet Alternatives: Sintered Ferrite and Mn-Al-C
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Single-Step Hydrometallurgical Method for the Platinum Group Metals Leaching from Commercial Spent Automotive Catalysts
No full textSimultaneous Prediction of the Critical and Subcritical Phase Behavior in Mixtures of Perfluoromethane (1)−Alkanes (2)
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Liquid−Liquid Equilibria for Binary and Ternary Systems Containing Glycols, Aromatic Hydrocarbons, and Water:  Experimental Measurements and Modeling with the CPA EoS
No full textHigh-Pressure Vapor−Liquid Equilibria of the Ternary System Carbon Dioxide + Vinyl Acetate + 2-Butanol. Experimental and Modeling Results
No full textModeling Water Saturation Points in Natural Gas Streams Containing CO<sub>2 </sub>and H<sub>2</sub>S-Comparisons with Different Equations of State
No full textSince
the discovery of the Pre-Salt layer in Brazilian waters, production
of high gas–oil ratio (GOR) has increased considerably. This
gas has a high content of water, CO<sub>2</sub>, and sometimes H<sub>2</sub>S. A study in different conditions was conducted using several
equations of state (EoS) such as Peng–Robinson, GERG-modified
Peng–Robinson (PR-ISO-04), Soave–Redlich–Kwong,
and Cubic Plus Association (CPA). Petrobras’ Process Simulator
has been used to perform the phase equilibrium calculations. All the
EoS except for CPA used parameters from the literature. A new parameter
estimation procedure for CPA has been proposed using a particle swarm
optimization algorithm followed by the SIMPLEX method presenting themselves
together as an optimal approach. The results show that PR-ISO-04 can
be considered to be an improvement compared to the original Peng–Robinson
but CPA appears to be the most promising approach to be used for predicting
dew points for water-containing mixtures, especially at high pressures
