Chemical Engineering Plant Economics
The payback method for the measurement of return on investment
gives a correct picture of profitability.
does not measure the discounted rate of return.
takes into account the cash inflows after the recovery of investments.
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Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium
Phosphoric acid is produced in wet process from phosphate rock and
The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be