viscosity of caustic soda solution at lower temperatures 3

[MWeber]

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.

 

[psafety]

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

 

[MWeber]

Thanks @psafety.

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

 

[psafety]

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

 

[ione]

Take a look at page 10 of the link below:

http://msdssearch.dow.com/Published...soda/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).

 

[MWeber]

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?

 

[jmw]

According to the chart of the solidfying curve for caustic, between 16% and 24% the solidifying temperature is less than or equal to -20[º]C; lowest is approx -28[º]C 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

http://www.ViscoAnalyser.com

 

[ione]

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.

 

[MWeber]

@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.

 

[Mech85]

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.

 

[jmw]

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

JMW

http://www.ViscoAnalyser.com