EQ-COMP: THE VAPOR LIQUID EQUILIBRIUM (VLE) SIMULATOR
Present day hydrocarbon industry cannot function without accurate knowledge of Vapor-Liquid Equilibrium properties of pure hydrocarbons and hydrocarbon mixtures. Vapor-Liquid Equilibrium properties of hydrocarbons are required in designing and effective operation of each and every equipment involving hydrocarbons ranging from hydrocarbon pumps to hydrocarbon storages and distillation columns. VLE properties are also required in upstream hydrocarbon processes like planning and simulation of oil and gas wells and drilling and production of hydrocarbons. Atmospheres of various heavenly bodies in the universe are composed of hydrocarbons like methane, ethane, propane and heavier hydrocarbons in combination with inorganic gases like N2, CO2 and H2S. Exploration of these heavenly bodies require simulation of their atmospheres which require accurate prediction of VLE properties of the mixture of various hydrocarbons with inorganic gases constituting their atmospheres. Accurate prediction of Vapor-Liquid Equilibrium properties require complex calculations which can only be executed through complex computer programs run on latest computers.
EQ-COMP is a complex chemical engineering process simulation tool for automatically calculating vapor-liquid equilibrium properties of pure hydocarbons and binary and multicomponent mixtures of hydrocarbons by just clicking a button. EQ-COMP is written using very basic software tools like MS Excel and VBA. EQ-COMP can predict vapor-liquid equilibrium properties for a hydrocarbon mixture for almost any composition with upto a maximum of 112 components using Peng Robinson cubic equation of state. The possible components can include non-polar hydrocarbons, mildly polar hydrocarbons, non-polar inorganic gases or mildly polar inorganic gases. LIST OF HYDROCARBONS – EQ-COMP. Various modules of EQ-COMP can be used to find out bubble point temperature, bubble point pressure, hydrocarbon dew point temperature, hydrocarbon dew point pressure, phase envelope, two phase composition and compressibility factor. EQ-COMP can accurately predict VLE properties in retrograde region and for compositions involving high proportions of non-condensables where other similar softwares falter. The phase envelope generated using EQ-COMP consists of equilibrium temperature values at a specified interval of 0.4 bars. This phase envelope clearly marks the critical point of mixture and cricondenbar and cricondentherm for the mixture can also be located on the phase envelope. Separate modules are designed to find out water dew point curve for mixtures containing water between 1 weight % and 50 weight % and hydrate curve for hydrocarbon mixtures. Concentration diagrams (x-y plot), temperature concentration diagrams (T-x-y plot) and enthalpy concentration diagrams (H-x-y plot) can be generated for binary mixtures using binary VLE calculation module of EQ-COMP. These diagrams can be used in Mc-Cabe Thiele method and Ponchon Savarit method to design distillation columns for binary hydrocarbon mixtures. Also various thermodynamic properties for hydrocarbon mixtures like enthalpy, entropy, gibbs free energy, specific heats and sonic speed can be calculated using thermodynamic properties calculation module of EQ-COMP.