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categoryهندسة كيميائية
schoolبكالوريوس
event_available2026-07-14
السؤال
Transcribed Image Text:
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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