Liquid process assembly

A method of carrying out a liquid process, wherein the liquid process is at least one of a continuous reaction and a continuous crystallisation, the method including using a liquid process assembly for at least one of a continuous reaction and a continuous crystallisation, the assembly including a length of pipework, and a reversible pump for selectively reciprocally moving liquid through the pipework wherein the reversible pump is a positive displacement replacement rotary pump, wherein the pump is controlled by a servo motor and wherein the pump has a magnetic drive located on the exterior of the pump, and wherein one or more liquid level sensors are provided in the assembly, and the liquid level sensor or sensors are connected to a controller such that the reciprocal movement of the pump can be varied in response to the detected liquid levels, and wherein one or more pressure sensors are provided in the assembly, and the pressure sensor or sensors are connected to the controller such that the reciprocal movement of the pump can be varied in response to the detected pressure levels, and reciprocally moving the liquid in the pipework.