Question: A 10 wt% aqueous solution of MgSO4 at 14.7 psia and 70F is sent to a double-effect evaporator system with forward feed at a flow

A 10 wt% aqueous solution of MgSO4 at 14.7 psia and 70°F is sent to a double-effect evaporator system with forward feed at a flow rate of 16,860 lb/h, to be concentrated to 30 wt% MgSO4. The pressure in the second effect is 2.20 psia. The heating medium is saturated steam at 230oF. Estimated heat-transfer coefficients in Btu/h-ft2-°F are 400 for the first effect and 350 for the second effect. If the heat-transfer areas of the two effects arc to be the same and boiling-point elevations are neglected, determine:

(a) The pressure in the first effect

(b) The percent of the total evaporation occurring in the first effect.

(d) The economy.

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First compute the overall mass balance MgSO 4 in the feed 0116860 1686 lbh Water in the feed 16860 1686 15174 lbh Water in the product solution 703016... View full answer

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