Repeat Example 15.24, except for a feed containing 400 ppm (by weight) of CaCl2 and 50 ppm of NaCl.

Example 15.24

Hard water containing 500 ppm (by weight) MgCO₃ and 50 ppm  NaCl is to be softened at 25C in an existing fixed, gel resin bed  with a cation capacity of 2.3 eq/L of bed volume. The bed is 8.5 ft  in diameter and packed to a height of 10 ft, with a wetted-resin void  fraction of 0.38. During loading, the recommended throughput is 15 gal/minute-ft². During displacement, regeneration, and washing, flow rate is reduced to 1.5 gal/minute-ft². The displacement and regeneration solutions are water-saturated with NaCl (26 wt%).
Determine: 

(a) Feed flow rate, L/minute; 

(b) Loading time to breakthrough, h; 

(c) Loading wave-front velocity, cm/minute; 

(d) Regeneration solution flow rate, L/minute; and 

(e) Displacement time, h.