An ion-exchange process using a resin to remove copper ions from an aqueous solution is conducted in a 1.0-in.-diameter column 1.2 ft high. the flow rate is 1.5 gph and the break point occurred at 7.0 min. integrating the breakthrough curve gives a ratio of usable capacity to total capacity of 0.60. design a new tower that will be 3.0 ft high and operate at 4.5 gph. calculate the new tower size and break-point time. ans. tb

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.