I had the same questions, and so far I’m here
HEPTANE vs HEXANE
PROS:
- It’s supposed to be less dangerous to have an accident with it.
- It’s USP Class 3 Residual Solvents List instead of 2.
- See this by @Future: Heptane vs hexane wash - #3 by Future
- Will evaporate faster I guess (how are these not proportional, what am I not getting?):
Heptane: ΔvapH° [32.00; 36.90] kJ/mol (Bu-Ac=1) = 3
Hexane: ΔvapH° [30.00; 32.10] kJ/mol (Bu-Ac=1) = 8.3
Ethanol: ΔvapH°[38.90; 42.59] kJ/mol (Bu-Ac=1) = 2.8
CONS:
- Hexane has lower boiling point by ~20C
- Needs more vacuum, more heat thus more cooling a the the condenser, ergo less energy.