A new simple and efficient flash algorithm for T-v specifications

In this work, we propose a new algorithm for T-v flash calculations, which is based on results from adapting the classic successive substitution method for a T-P flash, with equivalent simplicity, and therefore making it very attractive for engineering calculations, especially when speed may be important. Complementary aspects like initialization of variables and application to liquid-liquid separation are also discussed. Based on the new developed algorithm and the use of equations of state, the isochoric behaviors of different multicomponent mixtures are analyzed, including a natural gas, a synthetic gas condensate, and a CO2-hydrocarbon mixture, considering both vapor-liquid and liquid-liquid separations. The effect of temperature on storage tanks is illustrated based on isochores, and it is also shown how these calculations can help in the search of convenient conditions for separating the condensable fraction from a natural gas.