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Evaporation rates generally have an inverse relationship to boiling points; i.e. the higher the boiling point, the lower the rate of evaporation.
The general reference material for evaporation rates is n-butyl acetate (commonly abbreviated BuAc) which has the chemical structure shown below. Whenever a relative evaporation rate is given, the reference material must be stated.
The relative evaporation rate of butyl acetate is 1.0. Other materials are then classified as:
(BuAc = 1.0)
|Fast||> 3.0|| Methyl Ethyl Ketone = 3.8|
Acetone = 5.6
Hexane = 8.3.
|Medium||0.8 to 3.0||95% Ethyl Alcohol = 1.4|
Naphtha = 1.4
|Slow||< 0.8||Xylene = 0.6|
Isobutyl Alcohol = 0.6
Water = 0.3
Mineral Spirits = 0.1
We are not aware of a specific number for the absolute evaporation rate (i.e. in mass/time units) of butyl acetate. Presumably, such a number would depend on myriad variables such as temperature, atmospheric pressure, humidity, air flow, viscosity etc. The ASTM has developed a standard test method, D3539-87(2004) Standard Test Methods for Evaporation Rates of Volatile Liquids by Shell Thin-Film Evaporometer. We don't own a copy so we can't give you a synopsis of the variables involved.
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