High-precision determination of the mass proportion of a component in a multi-component fluid

A method for determining a mass proportion of a first component (W) of a multi-component fluid (F), comprising

• at least partially separating the first component (W) from the multi-component fluid (F) in a separation step,
• determining at least two reference flow rates (M1, M2), selected from
• a flow rate (m1) of the multi-component fluid (F) fed to the separation step,
• a flow rate (m2) of a residual fluid (T) resulting from the separation of the first component (W), and
• a flow rate (m3) of a separation fluid (K) occurring in the separation step,
• determining the mass proportion (xW) of the first component (W) from the chosen reference flow rates (M1, M2) while taking into account a non-separated residual proportion (mW2) of the first component (W) in the residual fluid (T), and
• accounting for an extraneous proportion (mD3) of a further component (D) of the multi-component fluid (F) that is separated at the same time in the separation step.