viscosity of methanol-water mixtures at low temps

[StoneCold]

Greetings all
I am looking for the viscosity of a 70wt.% methanol-water mixture at -20C, -30C and -40C. I have looked in the CRC handbook and Perry's to no avail.
Suggestions?

Thanks
StoneCold

 

[Montemayor]

StoneCold:

If you or your organization don't have a physical properties database available, then I recommend you read up on "The Properties of Gases and Liquids"; Reid and Sherwood; McGraw-Hill. There, in the Viscosity chapter are the recommended methods for handling this problem.

This book is one of the necessary and prerequisite tomes required by all Chemical Engineers - especially those involved in process design. In my opinion, you should own this book long before you invest in a Perry's Handbook.

I hope this helps.

Art Montemayor
Spring, TX

 

[25362]

StoneCold

From a ChE reprint of 1979, it appears that viscosities of methanol-water mixtures (40% and 90% methanol) comply with the formula [μ]=bT^m which on log-log paper results in a straight line of viscosity vs temperature.

Thus, if you can find (or measure) two viscosities at higher temperatures you could find the values you are after by drawing a straight line through these two points while extrapolating to the temperatures requested in your post.

 

[phex]

another source worth a shot would be the Dechema Database of binary mixtures. I can't imagine that a MeOH/H2O mixture isn't in it, with every possible ratio of components. In my experience, every university library has a copy of this masterpiece in stock.