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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: typhoon2028 on May 01, 2009, 12:45:50 PM

Title: Eutectic Salts
Post by: typhoon2028 on May 01, 2009, 12:45:50 PM

Does anyone know of any links for information on eutectic salts?

I am specifically intrested in information regarding sodium nitrite/potassium nitrate mixtures.  I would really like a melting point curve.

Thanks!

Title: Re: Eutectic Salts
Post by: ARGOS++ on May 01, 2009, 01:07:32 PM

Dear typhoon2028;

Have you already noticed?:
     http://chestofbooks.com/crafts/scientific-american/sup4/II-Eutectic-Salt-Alloys.html  

Good Luck!
                    ARGOS⁺⁺

Title: Re: Eutectic Salts
Post by: typhoon2028 on May 04, 2009, 08:16:38 AM

ARGOS,

Thank you for the reply.  The diagram listed on that website is for a mixture of potassium nitrate and sodium nitrate.  I am working with a mixture of potassium nitrate and sodium nitrite.  This mixture has a lower melting point than the mixture of nitrates.

It might have been better to discuss my reason for needing a melting point curve.  We use an eutectic salt mixture to foam plastic.  We have a waste stream that is mostly carbonate and bicarbonate in nature.  Analysis shows that the carbonate waste is predominately sodium carbonate and very little potassium carbonate.  My main problems are this:

1.)  How is my process salt mixture changing in melting point over time, if a known sodium amount is leaving?
2.)  Why is sodium preferred over potassium in the carbonate waste stream?
3.)  How much sodium nitrite can I add to the process to offset sodium leaving?

Title: Re: Eutectic Salts
Post by: ARGOS++ on May 04, 2009, 08:33:18 AM

Dear typhoon2028;

Sorry for misreading!

I searched for "eutectic salts nitrite", when a lot of hits came up.
But I think you have to search yourself to get your wished info, because I have not enough access to different papers.

Good Luck!
                    ARGOS⁺⁺