If a system consists of two immiscible luiquids (such as CCL4 and CH3OH), how many phases are there:

Biochemical Engineering mainly deals with the design, construction, and advancement of unit processes that involve biological organisms (such as fermentation) or organic molecules (often enzymes) and has various applications in areas of interest such as biofuels, food, pharmaceuticals, biotechnology, and water treatment processes. (Source: Wikipedia)