# Two Phase Composition Calculator

Two Phase Composition Calculator from EQ-COMP calculates

Two phase compositions, K values, liquid and vapour compressibility factor values, liquid and vapour densities and liquid and vapour molecular weight at desired temperature and pressure.

Hydrocarbon dew point temperature/ s, compositions, K values, liquid and vapour compressibility factor values, liquid and vapour densities and liquid and vapour molecular weight at two phase pressure.

Equilibrium temperature, compositions, K values and compressibility factor values at pressure values throughout the hydrocarbon dew point curve at increments of 0.4 bars.

Bubble point temperatures, compositions, K values, liquid and vapour compressibility factor values, liquid and vapour densities and liquid and vapour molecular weight at desired pressure.

Equilibrium temperature, compositions, K values and compressibility factor values at pressure values throughout the bubble point curve at increments of 0.4 bars.

Phase envelope temperature at increments of 0.4 bars throughout the phase envelope.

Pressure-Temperature (P-T) two phase VLE flash takes place when a hydrocarbon mixture is flashed at a particular temperature and pressure to give vapor and liquid phases in equilibrium with each other.

At a given pressure, a pure hydrocarbon converts from liquid to vapor at a specified temperature. However, a hydrocarbon mixture converts from liquid to vapor within a range of temperatures at a given pressure. Bubble point temperature is the temperature at which first bubble of vapor is formed from a hydrocarbon mixture originally in liquid form at a given pressure. Hydrocarbon dew point temperature is the temperature at which first drop of liquid is formed from a hydrocarbon mixture originally in vapor form at a given pressure. Within the temperature range from bubble point temperature to hydrocarbon dew point temperature at a given pressure value below critical pressure, the hydrocarbon mixture exists partly in liquid form and partly in vapor form. Hydrocarbon mixture exists in two phases above the critical pressure value also till cricondenbar pressure. Below critical pressure as the temperature increases from bubble point temperature to hydrocarbon dew point temperature, the liquid fraction in the two phase mixture decreases and the vapor fraction in two phase mixture increases. Also the composition of two phases varies with temperature and pressure inside the phase envelope of a hydrocarbon mixture on a pressure temperature plot. Generally, as the pressure decreases inside a phase envelope of a hydrocarbon mixture, the liquid fraction in the two phase mixture decreases. However for some hydrocarbon mixtures for a range of temperature and pressure, retrograde condensation phenomenon exists. As per retrograde condensation phenomenon, as the pressure of a hydrocarbon mixture decreases, more and more condensation of liquid takes place or liquid fraction increases. Retrograde condensation phenomenon is a strange two phase phenomenon which runs counter to the normal phenomenon and is observed practically for some petroleum mixtures.

Two phase compositions and fractions calculations are used to design distillation columns, hydrocarbon mixture storages and flash chambers. Retrograde condensation which is a typical two phase phenomenon, is used in oil and gas well simulations as it is practically observer for some oil and gas compositions.  Apart from these, two phase calculations have got extensive usage in all kinds of engineering processes involving hydrocarbons.

Sample Result – Download

Calculation cost (without Binary Interaction Parameters) : USD 100
Calculation cost (with constant or user defined BIPs) : USD 125

For requesting results of two phase composition calculation module and other modules, visit VLE CALCULATOR page.