Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Ethanol Freeze Protected Water Solutions

Freezing and flash points of ethanol based water solutions or brines

Sponsored Links

Ethanol based Water Solutions Freezing Point

Freezing Point
Ethanol Concentration
(% by volume)
0102030405060708090100
Temperature (oF) 32 25 15 5 -10 -25 -35 -55 -75 -110 -175
(oC) 0 -4 -9 -15 -23 -32 -37 -48 -59 -73 -115

Flash Points of Ethanol based Water Solutions

The flash point of a chemical is the lowest temperature where it will evaporate enough fluid to form a combustible concentration of gas. The flash point is an indication of how easy a chemical may burn.

Flash Point
Ethanol Concentration
(% by weight)
510203040506070809096
Temperature (oF) 144 120 97 84 79 75 72 70 68 63 63
(oC) 62 49 36 29 26 24 22 21 20 17 17

Warning

  • HIGH flammability if pure

Alternatives to Ethanol based Water Solutions

Example - Ethanol Concentration at Freezing Point at -20oC

The ethanol concentration with freezing point at -20oC can be calculated by interpolating the concentration between freezing point -15oC and -23oC in the table above.

(((40%) - (30%)) / ((-23oC) - (-15oC))) ((-15oC) - (-20oC)) + (30%) = 37.3 %

This calculation is simplified by assuming that the concentration vs. freezing point follows a straight line. This not necessary correct.

If a 90% ethanol-water solution shall be mixed with clean water to achieve a freezing point of -20oC (ethanol concentration 37.3% (0.373)) - the amount of added water can be calculated with volume balance - the amount of ethanol before mix is the same as after the mix:

cs Vs = cm (Vs + Vw)                                                        (1)

where

cs = concentration in ethanol - water solution 

Vs = volume of the ethanol - water solution (liter, gallon)

cs = concentration in mix

Vm = volume of mix (liter, gallon)

Vw = volume of the added clean water (liter, gallon)

Rearranging the equation to express the volume of water added to the mixture

Vw = (cs - cm) Vs / cm                                                     (1b)

Substituting with values

Vw = (0.9 - 0.373) Vs / 0.373

     = 1.41 Vs

- for every liter 90% ethanol-water solution 1.41 liter of clean water must be mixed in to achieve an ethanol concentration of 37.3% and freezing point -20oC.

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: ethanol water freezing flash point
  • es: etanol punto de inflamación de congelación del agua
  • de: Ethanol-Wasser-Frostflammpunkt
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Citation

This page can be cited as

  • Engineering ToolBox, (2005). Ethanol Freeze Protected Water Solutions. [online] Available at: https://www.engineeringtoolbox.com/ethanol-water-d_989.html [Accessed Day Mo. Year].

Modify access date.

Customize Ads in the ToolBox

Make ads more useful in Google Ad Settings .

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

10 19

Sponsored Links
.