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It is desired to concentrate a NaOH solution from 12.5 % to 40% in a double effect evaporator. 50,000 lb/hr of feed solution enters the evaporator at 120 oF, and steam at 15 psig is available for effecting the concentration. Vacuum in the 2nd effect is held at 24in. Hg, and water from a cooling tower is available at 85 oF. Estimate
(a) quantity of feed and water needs for the forward feed operation,
(b) quantity of feed and condenser water need for the backward feed operation,
(c) Surface need for the operation in (a), suppose U is 400 and 250 Btu/hr(ft2) (oF) for the first and second effect respectively. UD equal to 450 and 350 in two effects correspondingly.
consider a system at 290k for which the enery of the nth state is En=n(0.01ev) using 1+a+a square+ a cube+...=1/(1-a), find the value of partition function.find the constant C in P
bernaulli''s theorm related numericals
The fresh feed to an ammonia production
numericals
limitation of its
Hard-Baking Hard-baking is the final step in the photolithographic process. This step is essential in order to harden the photoresist and better adhesion of the photoresist to
Bulk density: This is represented by the weight per unit volume of the refractory of (g/cm 3 ). This volume includes the volume of the pores space, therefore, higher the bulk dens
a wet gas is produced through a two -stage seperator system. the 555 psia -89degree fahrenheit separator produces 170,516 scf/stb, and the 70 degree farenheith stock tank produces
heat exchanger would be difficult to model
Factors affecting on process design
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