Chemical Engineering Applications -- Overview

Flash Calculator ("FLSC") is a self-contained, easy-to-use product for getting single flash solutions and bubble or dew points. It contains Digital Analytics' vapor-liquid equilibrium database and modelling methodology which includes Peng-Robinson EOS, UNIFAC, and Wilson methods. The database is not large but may be expanded by the user.

FLSC produces a text report and files for 3 types of EDTECH plots for vapor-liquid equilibria. See Using Flash Calculator for more details.

We previously offered Distillation Guide ("DGSC") which simulates single standard-style distillation columns using the vapor-liquid equilibrium methods mentioned above and the same database. It uses Digital Analytics' Solver methodology condensed into a special purpose program (no user Solver programming is involved). The commercial version of DGSC is now set up to model distillation columns with up to 34 chemical components and up to 60 tray stages. (Modelling 34 components and 60 stages simultaneously might be too big a problem, but arrays are dimensioned for this.)

DGSC produces a DMSolver solution file which can be used to initialize an FT distillation problem, and it also produces a plain-text report, a file for importing into Excel, and files for 5 different types of EDTECH plots.

Further development and testing of DGSC has been delayed for an excessive length of time due to other work. Because of this it is temporarily unavailable.

Demo Versions:

 There are two ways to try Flash Calculator for free -- you can download the full version, register it with us for free, and use it for 60 days, after which you must reregister paying the license fee. You can also download a completely free and unregistered demo version which does the same individual vapor-liquid calculations as the normal version, but only allows up to 4 chemical components in the mixture. Also, it does not do the EDTECH plots of k-factors, bubble-and-dew points, etc. that the full version does.

Flowsheet Toolkit ("FT") is used with DMSolver (formerly PMSolver) for chemical engineering steady-state simultaneous-modular flowsheet and related problems. General interconnected networks of flash, distillation, heat exchanger, etc., modules, including user-written modules, may be modelled. FT generates Solver source code for an interconnected network of modules which you specify through menus. FT includes Flash Calculator and Distillation Guide. As with DGSC, other work has restricted the amount of time we have spent updating and testing this system, and it is currently not available.

  The latest (circa 2013) FT contains the following major components:

 *** The physical property database management program DBSET. A run of this program excerpts property parameters from the entire physical property database and prepares tables to be input to the actual simulation program. There are databases containing the single-compound property parameters and binary mixture parameters. These can be changed and added to by the user to add compounds and binary parameters to the database. These are the same database files used by Flash Calculator and Distillation Guide.

*** The set of interconnected programs and source code library files which creates Solver simulation source code from user's selection of various types of modules from presented menus and user's specification of stream interconnections.

*** The Pascal unit which links directly to the simulation program and provides the physical property computation.

 *** Distillation Guide (Self-Contained) leads you through getting an initial solution for a distillation column.

*** Flash Calculator helps you with initializing flash problems, boiling & condensing heat transfer, etc.

FT Property and Process Features are as follows: (see Using Flowsheet Toolkit for more details)

 *** Ideal gas, real gas, and liquid Cp, Liquid & vapor molar volumes, vapor pressure, heat of vaporization, enthalpy, viscosity, thermal conductivity

 *** Vapor/liquid equilibrium by Peng-Robinson EOS, Wilson equation , or UNIFAC methods.

 Flash and Distillation
  -- Flash to specified pressure
  -- Single ideal trays or real (efficiency <100%) trays
  -- Various column configurations constructed of trays

 Heat Exchangers
  -- Simple, user specifies U and A
  -- Special cases, e.g. UA computed to cool to dew pt.
  -- Shell and Tube -- for single phase, Xfer coefficient and pressure drop estimated by handbook methods

  Compression / Pumping / Expansion, Stream mixing / splitting, Pressure drop in pipes, etc.