# 400–430 degrees Celsius heated bath

I want to perform a reaction which needs the temperature to be maintained between 400–430 °C. Since it's the only practical solution, I opted for a heated bath.

I'm looking for a hydrocarbon fraction/blend with the boiling point in this range, however, I keep finding conflicting information. If anyone knows such a hydrocarbon product please, let me know.

• Those temperatures are well above the flash point of any hydrocarbon I can find, and above the autoignition point of many. Might you be able to get by with a sand bath or tightly-regulated mantle instead? May 18, 2019 at 0:48
• The point of a heated bath is that the temperature, given sufficient heating, will be exactly the boiling point of the medium. Sand bath would offer no control over the temperature. May 18, 2019 at 1:53
• Also, to rig such a mantle on ones own would be no small feat. Not to mention being able to afford one. May 18, 2019 at 2:07
• Keep in mind there is also a variety of molten salt baths; however, you'll need a thermocouple and protect the glassware as the majority of molten salts would etch the glass. May 18, 2019 at 6:37
• What's wrong with carrying out your reaction in a furnace? May 18, 2019 at 7:37

You can try $$\ce{C30}$$ hydrocarbon, triacontane (CAS #: 638-68-6). It is a straight chain hydrocarbon with formula weight of $$\pu{422.8 gmol^{-1}}$$ ($$n$$-$$\ce{C30H62}$$). It is a solid at $$\pu{25 ^{\circ}C}$$ and NIST Webbook reported its boiling point as $$\pu{722.9 K}$$ ($$\approx\pu{450 ^{\circ}C}$$) at $$\pu{1 atm}$$. More phase changing data can be found in [NIST Webbook] and following reference:
• J. S. Chickos, W. Hanshaw, “Vapor Pressures and Vaporization Enthalpies of the n-Alkanes from $$\ce{C21}$$ to $$\ce{C30}$$ at $$\mathrm{T} = \pu{298.15 K})$$ by Correlation Gas Chromatography,” J. Chem. Eng. Data 2004, 49(1), 77–85 (DOI: 10.1021/je0301747).