Pick a tank or a well-mixed reactor from your flowsheet. It starts from the steady-state result, then a step change is applied to its inlet and you see how the unit responds over time.
Pick a tank or a well-mixed reactor from your flowsheet. It starts from the steady-state result, then a step change is applied to its inlet and you see how the unit responds over time.
Textbook shortcuts and rule-of-thumb sizing are order-of-magnitude; purchased costs are about ±30–50 %. Rate constants in the reaction library are placeholders. Every calculation shows its working so it can be checked by hand. Check important numbers against the cited books.
Water and steam
Phase equilibrium
Species properties
Distillation, absorption and reactors
Equipment selection and cost
Textbooks and handbooks (reference library)
Examples
Saves the whole flowsheet (all blocks, streams and labels), not just the visible part. Labels show the current results and units. The report is a table file with streams, component flows, duties, sizing and warnings.
Break the molecule into groups and enter how many of each it has (for example ethanol: 1 × –CH3, 1 × –CH2–, 1 × –OH alcohol). The estimate gives boiling point, critical properties, heat of vaporisation, ideal-gas heat capacity, a vapour-pressure (Antoine) fit and a rough density. Typical errors: boiling point about ±12 K, critical temperature a few %, heat capacity of liquids with hydrogen bonds is poor. Replace the numbers with measured data whenever you have them.
Simple view hides expert features. Switch it off at the top when you need them.
This removes every block and stream on the canvas. You can undo it with the undo button.
Loading the demo overwrites the flowsheet on your Steady canvas with a small tank and reactor example. You can undo it with the undo button (or Ctrl+Z).
Vapour–liquid equilibrium uses Ki = γi·Pisat/P. Ideal sets γ = 1 (Raoult). NRTL uses binary parameters A12, A21 (cal/mol; τ = A/RT) and α. It applies to the flash, the shortcut column and the rigorous column. Pairs without data are treated as ideal.
Built-in pairs: ChemSep interaction-parameter database (DECHEMA NRTL data at 1 atm; Kooijman and Taylor), Artistic License 2.0. They are fitted over limited ranges: check against your own data. Your entries replace the built-in values.
One species per row. Columns: name, phase (L, S or G), cp (kJ/kg·K), M (kg/kmol), rho (kg/m³); optional for liquids that boil: A, B, C (Antoine, log₁₀P[Pa] = A − B/(T[K] + C)), Tb (°C), lam (kJ/kg), cpg (kJ/kg·K). Comma or semicolon separated (semicolon files may use a decimal comma). Existing species of the same name are replaced.
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