A Better Desalinator

What are our options for producing potable water from salt water Perhaps the most obvious design is an evaporator. The process separates vapor from liquid, which is easy and efficient. And because water boils at a temperature much lower than salt sublimes, the vapor phase will be essentially pure H2O. However, evaporation may require too much energy to be cost effective. Even if one makes liberal use of heat exchangers and condensers to reclaim the heat from the steam and the hot brine, the process still may be too expensive - although the energy costs will be reduced, the 

Actually we calculate Fw,s = 87.037037, but we retain only two significant figures. If it is not clear why only two figures are significant, you should study Appendix C. 

We use the same nomenclature as before water = W, salt = 5, and total amount = T. But now we have an additional component, ice. Do we need to define ice = / We could, but that would require a source for the ice, such as the physical reaction 

It is not necessary to label ice as a pure component. Instead we will lump the ice and water into W thus H2O = W = water plus ice. Likewise we do not need to create a label for brine. 

Because we seek information only on streams leaving the process, streams 3 and 5, perhaps it is not necessary to calculate the details of the intermediate streams. We 

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