The constant B'" may also be evaluated from heat capacity 
data asmdone: previously (2). Equataons 12 and 16 may be 
combined to yield 
PUNE TCO MeSSiscel Om: ce Tse a 10,0720700730 xT 
2), S2O2RG se Gee IS a as (18) 
table 14 gives-the values of B'' obtained from heat 
capacity and heat of mixing data. The agreement is good. 
Table 14 
Observed and Calculated Values of B" 
BRB" 
emperature.. oC Observed Calculated 
OS) 6.0993 6.0993 
50 ATO 4.5800 
WS 5 HAVO) Se tow JE 
Comparison with Connors'.data: Some data on heats of 
mixing of sea water solutions has also been reported by 
Connors (11) in the temperature range 0 to 30°C and salinity 
range 10% to 40% Although most of Connors' data is at 2°C 
and a precise comparison will have to await our low temper- 
ature measurements, a fair comparison may be made by using 
equation (18) for B" in the extended Debye-Huckel 
COnrewation.. Connors” sobserwed temperature changes were 
converted to heats of mixing and compared with our estimated 
values, as shown in Table 15. The two values agree within 
hits sermnor estimates . 
BOILING POINT ELEVATION (BPE) 
Boadaine point elevatvon; data 1s required tforidesign of 
desalination, plants.) im ease of multa-etftect or multi- 
Stage milash evaporatoms, thevdata as required for icalculation 
of heat transfer areas and rates. In case of reverse osmotic 
4l 
