System and method for determining concentrations of components of a mixture

The invention discloses a system and a method for determining concentrations of components of a multiphase fluid, the system comprising: a first flowmeter configured to receive a fluid flow and to generate one or more measurements of the fluid flow, the fluid flow including a first liquid and a second liquid, wherein the first and second liquids are immiscible; a separation vessel configured to receive the fluid flow, and to at least partially separate the first liquid and the second liquid; a second flowmeter configured to receive either the second liquid or a mixture of the first liquid and the second liquid, through a valve and to generate one or more measurements of either the second liquid or the mixture of the first liquid and the second liquid, wherein a proportion of the second liquid to the first liquid in the mixture is greater than a proportion of the second liquid to the first liquid in the fluid flow; a third flowmeter configured to receive the first liquid and to generate one or more measurements of the first liquid ; and a data processing apparatus operatively coupled to the first flowmeter, the second flowmeter, the third flowmeter, the data processing apparatus configured to perform operations comprising: receiving the one or more measurements of the fluid flow from the first flowmeter; receiving the one or more measurements of the second liquid or the mixture of the first liquid and the second liquid from the second flowmeter; receiving the one or more measurements of the first liquid from the third flowmeter, and determining a concentration of the second liquid in the fluid flow.