# Component Class¶

This is a general purpose Component object, and is suitable for general cases where the user is not concerned about distinguishing solutes from solvents (is_solute() and is_solvent() will both raise TypeErrors). This also forms the base class for all other Component types.

class idaes.core.components.Component(*args, **kwargs)
Parameters: rule (function) – A rule function or None. Default rule calls build(). concrete (bool) – If True, make this a toplevel model. Default - False. ctype (str) – Pyomo ctype of the block. Default - “Block” default (dict) – Default ProcessBlockData config Keys valid_phase_types List of valid PhaseTypes (Enums) for this Component. elemental_composition Dict containing elemental composition in the form element : stoichiometry henry_component Dict indicating phases in which component follows Herny’s Law (keys) with values indicating form of law. dens_mol_liq_comp Method to use to calculate liquid phase molar density enth_mol_liq_comp Method to calculate liquid component molar enthalpies enth_mol_ig_comp Method to calculate ideal gas component molar enthalpies entr_mol_liq_comp Method to calculate liquid component molar entropies entr_mol_ig_comp Method to calculate ideal gas component molar entropies pressure_sat_comp Method to use to calculate saturation pressure phase_equilibrium_form Form of phase equilibrium constraints for component parameter_data Dict containing initialization data for parameters _component_list_exists Internal config argument indicating whether component_list needs to be populated. initialize (dict) – ProcessBlockData config for individual elements. Keys are BlockData indexes and values are dictionaries described under the “default” argument above. idx_map (function) – Function to take the index of a BlockData element and return the index in the initialize dict from which to read arguments. This can be provided to overide the default behavior of matching the BlockData index exactly to the index in initialize. (Component) New instance

## Solute Class¶

The component object is suitable for species which should be treated as solutes in a LiquidPhase. The only difference between this and a general Component is that is_solute() returns True and is_solvent() returns False.

## Solvent Class¶

The component object is suitable for species which should be treated as solvents in a LiquidPhase. The only difference between this and a general Component is that is_solute() returns False and is_solvent() returns True.

## Ion Class¶

The Ion class is suitable for ionic species which appear in LiquidPhases. This is similar to the Solute class, in that is_solute() returns True and is_solvent() returns False. Additionally, Ion objects have a charge configuration argument for recording the charge on the ion (must be an integer) and do not have a valid_phase_types argument (as it is assumed they can only exist in LiquidPhases).

Note

Users are encouraged to use the Anion and Cation classes instead of the generic Ion class, as these validate that sign of the charge configuration argument.

## Anion Class¶

The Anion class is suitable for anionic species (i.e. negatively charged) which appear in LiquidPhases. This is a subclass of Ion, which enforces that the sign on the charge configuration argument be negative.

## Cation Class¶

The Cation class is suitable for cationic species (i.e. positively charged) which appear in LiquidPhases. This is a subclass of Ion, which enforces that the sign on the charge configuration argument be positive.