A 10 wt% aqueous solution of NaOH at 100F and a flow rate of 30.000 lb/h is
Question:
A 10 wt% aqueous solution of NaOH at 100°F and a flow rate of 30.000 lb/h is to be concentrated to 50 wt% by evaporation using saturated steam at 115 psia.
(a) If a single-effect evaporator is used with U 400 Btulh-ft2-°F and a vapor-space pressure of 4 in. Hg, determine the heat-transfer area and the economy.
(b) If a double-effect evaporator system is used with forward feed and U = 450 Btu/h-ft2-°F and 112 = 350 Btu/h-ft2-°F, and a vapor- space pressure of 4 in. Hg in the second effect determine the heat- transfer area of each effect, assuming equal areas, and the overall economy.
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a Singleeffect First compute the mass balance NaOH in the feed 0130000 3000 lbh Water in the feed 30000 3000 27000 lbh Water in the product solution 50503000 3000 lbh Water evaporated 27000 3000 24000 ...View the full answer
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