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westdeap12
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Join Date: Aug 2010
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Thermal Fluid

03/13/2012 4:44 AM

We have a colorless thermal fluid which is heated in the lab scaled water bath system. along the time, the color changed to yellow. May i know what economical way to add in to avoid oxidation of thermal fluid (ie change in color).
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Crabtree
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#1

Re: thermal fluid

03/13/2012 5:01 AM

<sigh> You have phoned the oil manufacturer, haven't you?

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dkwarner
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#2

Re: Thermal Fluid

03/13/2012 11:33 PM

Water is a colorless thermal fluid! Obviously we need a lot more information! A small amount of rust in the water might be considered yellow. If you don't know what the fluid is, we can only guess what might be discoloring it. Are you sure it is oxidization that is causing the yellow? Over how much time did the fluid discolor?

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zasmine
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#3

Re: Thermal Fluid

03/14/2012 12:49 AM

I assume the colorless thermal fluid is Silicone Oil. It is like any other Organic Oil, just that some of the Carbons in the backbone are substituted with Silicon. It is used in the lab for its excellent thermal stability and nonflammablilty (in case you use a burner or a hot plate). This is often put to work in heating baths used during prolonged experimentation.

My question is what is changing with the color? Is it just the aesthetics or do you notice a change in its physical properties that is bothering your application- say higher viscosity, lower/higher thermal conductivity. Is the color because of some foreign matter that you can perhaps filter? Sometimes our oils turn dark after awhile too, but we don't see much change in its physical properties, so we live with the color.

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PFR
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#4

Re: Thermal Fluid

03/14/2012 1:24 AM

As Frank Zappa said, "Don't eat the yellow snow", so I suspect Husky contamination.

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Relativity PL
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#5

Re: Thermal Fluid

03/14/2012 2:17 AM

If you know the grade of fluid in the water bath system, you can check with the manufacturer.

If you do not know the grade of fluid, these people are a great starting point. Their website discusses coloration etc. and we have standardized on Therminol heat transfer fluids in our wax plant and polymer processing plant.

http://www.therminol.com

Mark Bingham
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Ried
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#6

Re: Thermal Fluid

03/14/2012 11:10 AM

If you have a closed thermal system with an expansion tank, consider using an inert gas blanket in the expansion tank to reduce oxidation.

What is the thermal fluid? Is it oxidation causing discoloration?

What temperature and pressure does the system operate at?

How big is the system and how much does it cost to change out the thermal oil?

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Crabtree (1); dkwarner (1); PFR (1); Relativity PL (1); Ried (1); zasmine (1)

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