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categoryهندسة كيميائية schoolبكالوريوس event_available2026-07-14

السؤال

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An existing forced-circulation evaporator is to be used to concentrate 44 wt% NaOH to 65 wt% NaOH using steam at 4 atm. The feed temperature will be 40°C and the pressure in the vapor space of the evaporator will be 2.0 psia. The evaporator has a heat-transfer area of 232 m². The overall heat-transfer coefficient for the given conditions is estimated to be 2,000 W/m².°C. The density of the feed solution is 1,450 kg/m³. Neglect heat losses from the evaporator. Determine: (a) The temperature of the solution in the evaporator in °C. (b) The heating steam requirement in kg/h. (c) The m³/h of feed solution that can be sent to the evaporator. (d) The kg/h of concentrated NaOH solution leaving the evaporator. (e) The rate of evaporation in kg/h.

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