Question: A continuous evaporator is operated with a given feed material under conditions in which the concentration of the product remains constant. The feed rate at

A continuous evaporator is operated with a given feed material under conditions in which the concentration of the product remains constant. The feed rate at the start of a cycle after the tubes have been cleaned has been found to be 5000 kg/h. After 48 h of continuous operation, tests have shown that the feed rate decreases to 2500 kg/h. The reduction in capacity is due to scale formation. If the down time per cycle for emptying, cleaning, and recharging

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