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viscosity of caustic soda solution at lower temperatures
3

viscosity of caustic soda solution at lower temperatures

viscosity of caustic soda solution at lower temperatures

(OP)
We have to solve a very special pumping problem in an explosive environment.

Can anybody help with data about the viscosity of caustic soda (sodium hydroxide) 20% solution at lower temperatures between 0 and -20°C?

Can´t find any data on the web or in my literature.

Thanks in advance.

RE: viscosity of caustic soda solution at lower temperatures

5 cps at 20C my chart bottoms at 8cps at 5C

RE: viscosity of caustic soda solution at lower temperatures

(OP)
Thanks @psafety.

I´m looking for values below zero degree. Do you also have such data?

RE: viscosity of caustic soda solution at lower temperatures

No further viscosity values, appears -20F it freezes.

RE: viscosity of caustic soda solution at lower temperatures

Take a look at page 10 of the link below:

http://msdssearch.dow.com/PublishedLiteratureDOWCOM/dh_04fa/0901b803804fa679.pdf?filepath=causticsoda/pdfs/noreg/102-00011.pdf&fromPage=GetDoc

There's a graph showing viscosity vs temperature values. The graph doesn't cover the range you're looking for, but you could extrapolate values of interest (between 0 °C and -20 °C and for a 20% NaOH solution you're still above freezing point).

 

RE: viscosity of caustic soda solution at lower temperatures

(OP)
Thanks a lot @ione.

This graph I was using sins some time now and it´s the only source I know so far which gives such detailed information. Unfortunately not in the range that I´m looking for right now. Extrapolating would be sufficient in the range around 0 °C. But we are narrowing -10 to -20°C in this special process and the extrapolatet data would not be as accurate as we need as we are narrowing freezing point.

Anybody else has some idea or source?

RE: viscosity of caustic soda solution at lower temperatures

According to the chart of the solidfying curve for caustic, between 16% and 24% the solidifying temperature is less than or equal to -20ºC; lowest is approx -28ºC for 19.5% solution.

But unfortunately none of the data I have gives a viscosity at the temperatures you are interested in.

The references I have include a data sheet from Solvay Chemicals and OxyChem Caustic Soda .

Can't find my Rubber book at the moment (just moved house) but I guess if the data was in there you'd not be posting.
 

JMW
www.ViscoAnalyser.com

 

RE: viscosity of caustic soda solution at lower temperatures

Probably you've already run into the link below, anyway....

http://www.iapws.jp/Proceedings/Symposium02/086Alexandrov.pdf

At page "87" it is stated that Baron and Tscherba investigated dynamic viscosity in the range from 246 K to 288 K. It could be a starting point.
 

RE: viscosity of caustic soda solution at lower temperatures

(OP)
@ione

thanks again the IAPWS link was great but I could not find any library for this journal.

I think, we have to do some measurements at some laboratory at first.

RE: viscosity of caustic soda solution at lower temperatures

Hi,

From the Orica Chemicals "Caustic Soda Handbook" issued September 1998 in Australia, it was an 'Absolute viscosity of Caustic Soda Solutions' versus temperature (in degrees Celsius) graph. For a 20% solution, I obtained the following viscosities:

at 10 deg C the Viscosity = approx 7 cP

at 0 deg C the Viscosity = approx 12-13 cP

at -10 deg C the Viscosity = approx 24-25 cP

minus 10 deg C was the limit of the viscosity readings for a 20% solution.

Hope this helps.





  

RE: viscosity of caustic soda solution at lower temperatures

Using the ASTM D341 equation, Mech85's data suggests a viscosity in the range 56 to 59cP at -20ºC

JMW
www.ViscoAnalyser.com

 

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