Question

4. In the production of soybean oil, beans containing 18.0 wt% oil and 82.0 wt% solids are ground and fed to a stirred tank (also called an extractor), along with a stream of liquid n containing recycled hexane and fresh hexane. The feed ratio is 4.2 kg hexane/kg beans. ground beans are suspended in the liquid, and essentially all of the oil in the beans is ex into the hexane. The stream exiting the extractor (also called the effluent) passes to a ii filter cake contains 79.0 wt% beans solids and the balance bean oil and hexane, the latter two are in the same ratio in which they emerge from the extractor. The filter cake is di liquid filtrate is fed to a heated evaporator in which the hexane is vaporized as a liquid. The oil is stored in drums and shipped. The hexane vapor is subsequently coo and condensed, and the liquid hexane condensate is recycled to the extractor. The tracted lter. The and the oil remains led Assuming a flow rate of 100 kg/sec of soybeans, calculate a) The flow and composition of the stream entering the filter b) The flow and composition of the stream entering the evaporator c) The flow and yield of bean oil product (kg oil/kg beans fed) d) The required fresh hexane feed e) The recycle to fresh feed ratio (kg hexane recycled/kg fresh feed)

Answer 1