EQ-COMP VLE Calculator / VLE Software has got certain advantages over conventional chemical process simulation software packages like Aspen Hysys, Prosim, Chemshare etc. which are mentioned below:

1 – A conventional chemical engineering process simulation software though an extension of the EQ-COMP cost somewhere around US $ 50,000 – 100,000 per installation with additional expenses for additional licenses on annual basis. EQ-COMP is the basis of some main modules of these simulation softwares. Services of EQ-COMP can be availed at a fraction of this cost on per calculation basis. Calculation cost for running each module is given on calculation modules page. These calculations can be availed through VLE Calculator page of the website. Users should download any of the MS  excel input sheet for respective calculation module from the list of various calculation modules given on the page. Subsequently the user can pay for the calculation module from the paypal payment button given against each of the calculation module mentioned in the list, fill the downloaded MS excel input sheet and send it on The request for calculation results may take upto 24 hours to clear depending on the time difference between the Country of origin of the request and INDIA as the same would have to be fed into EQ-COMP application at our office in INDIA for getting the results which will then be sent to the users e-mail as an MS Excel attachment.

2 – EQ-COMP is offered on software as a service (SAAS) model where ready results of the queries will be provided to the customer as a service. This way the customer would not have to arrange for infrastructure like a standalone high-end computer with suitable backend softwares programs for running and safeguarding the present software. Also the customer would not have to learn how to operate the software as ready results of the queries would be provided to him through e-mail. The only requirement for availing the services of EQ-COMP is a valid email address to send and receive queries for which any internet enabled computer can be used. This way the results can be obtained by the Engineer/ Scientist even when he is not in his office during off hours or while on site when he can not use his office resources which may include simulation software.

3 – In a conventional chemical engineering simulation software, there are number of modules meant for different industries. All these modules may not be required for one company. EQ-COMP has been specifically designed for hydrocarbon industry complying specific requirements which can be foreseen before paying for running any one of the modules every time.

4 – EQ-COMP can give almost any result involving hydrocarbon VLE most accurately using the preferred Peng-Robinson equation of state. Some the results possible with EQ-COMP are given below:

A. Phase equilibrium curve with temperature-pressure data for any pure non-polar or mildly polar compound with known critical temperature, critical pressure and acentric factor.

B. VLE properties like bubble point temperature, bubble point pressure, dew point temperature, dew point pressure,two phase composition, bubble point composition, dew point composition etc. for almost any hydrocarbon mixture including upto a maximum of 112 components. 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.

C. Complete phase envelope for almost any hydrocarbon mixture with critical point, cricondenbar, cricondentherm and multiple critical points.

D. VLE properties in the retrograde region.

E. VLE properties and Phase envelope for hydrocarbon mixtures involving high concentration of non-condensables.

F. Prediction of state of hydrocarbon mixture (liquid, vapour, two phase or supercritical) at a particular temperature and pressure.

G. Customisation of software to include any other non-polar or mildly polar hydrocarbon in the calculations as per client’s requirement.

H. Inclusion of values of binary interaction parameters provided by the client to generate results.

I. Inclusion of constant and temperature dependent binary interaction parameters in case desired by the client.

J. Generation of liquid and vapour compressibility factors for any hydrocarbon mixture over a range of temperatures and pressures.

K. Generation of x-y, T-x-y, H-x-y and critical point profile for any binary mixture comprising of non-polar or mildly polar hydrocarbons.

L. Hydrate dissociation curve for any hydrocarbon mixture in presence and absence of inhibitors along with type of hydrates formed (S I or S II), hydration number of hydrates formed, density of hydrates formed, vapour composition, liquid composition, aqueous phase composition, hydrate phase composition  and fractional filling of small and large hydrate cavities with various hydrate formers present in the hydrocarbon mixture.

M. Various thermodynamic properties like enthalpy change from standard conditions, entropy change from standard conditions, gibbs free energy change from standard condition, heat capacity at constant pressure (Cp), heat capacity at constant volume (Cv), heat capacity ratio, sonic speed, isobaric thermal expansivity and Joule Thomson coefficient  throughout the phase envelope at increments of 0.4 bars

N.  Minimum reflux using Underwood method, number of equilibrium trays in rectification and stripping section, liquid and vapor composition on various trays, column efficiency, actual number of trays, column diameter and column height  for binary and multi-component distillation columns

O.       Calculation of CO2 freezing and frost curve for mixtures containing CO2

P.`       Inclusion of upto 40 numbers of pseudo-components

Q.           Inclusion of highly polar compounds like ammonia (NH3) and water (H2O) in its calculations

5 – As EQ-COMP has been developed with the most basic infrastructure and facilities and basic software tools like MS Excel so certain limitations and areas of improvement may exist. The same may be conveyed at Otherwise we have tried to make EQ-COMP comparable to the best in the world as far as the final output of the application goes.