Finding and defining components

• Search by name, formula or CAS number. Common names, trade names and abbreviations find their component too — MEA finds ethanolamine, muriatic acid finds hydrochloric acid, table salt finds halite.
• An Exact match tag marks the row that is literally what you typed.
• The Type column says whether it is a fluid or a solid. Solids travel in their own substream and never enter vapour-liquid equilibrium.
• Free plans take up to 10 fluid components in a simulation; Pro takes 40.

• Curated — checked by hand against published data: the components a course or a design most often uses.
• Open data — from openly licensed property tables, each entry checked by the test suite (a fluid must reproduce its own normal boiling point).
• Open data* — the same, with one gap filled by a standard estimation method, such as a vapour-pressure or heat-capacity correlation. Hover a selected row to see which.

• Hypothetical species (every plan) — “A”, “B” and “C” as a textbook problem states them: a molar mass, a heat capacity, an enthalpy of formation and a density. The values you give hold exactly at every temperature, so a hand calculation and the simulator agree.
• Nonconventional components (every plan) — a coal, a biomass, a bio-oil, an ash or a polymer, defined from its analysis. See Solids, coal and biomass.
• AI estimate (Pro) — a full property set for a real molecule that is missing, by named estimation methods, each value labelled with its method and checked before it joins your flowsheet.

If a common chemical seems to be missing, try its other names or its CAS number first — and tell us, so we can add the name or the component.