Crystallization of hydrogenated triphenyl (heat transfer oil)
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We are currently conducting experiments by placing triphenylhydride (a heat transfer fluid) in a refrigerator set at -5 degrees Celsius, and crystallization has occurred now. Generally speaking, its crystallization point is -20 degrees. Moreover, its moisture content is only 100 ppm. The acid value is less than 0.5 mg/g. I tested it with a pH strip, and there was no reaction. Those that belong to the aromatic hydrocarbons category (mostly composed of benzene rings) have C-H bonds; generally speaking, they do not crystallize easily at low temperatures. Dear seniors, could you help me analyze the factors that may lead to crystallization? Thank you. Some people say it’s dehydrogenation, but the conditions for dehydrogenation are usually quite stringent; can such conditions be met at low temperatures?
Could it be that the concentration of triphenylhydride is too high?
Is it brand-new triphenylhydride or recycled? The recovered material will contain dehydrogenated components.
We produce it ourselves. It’s not recycled. The concentration won’t be very high either. The degree of hydrogenation is also just right. Indicators such as flash point and boiling range are all normal
It is recommended to conduct chromatographic analysis to check whether the composition of triphenyl has changed.
Is triphenyl produced in China? Is the triphenyl used as a raw material for producing heat transfer oil generally purchased from outside?
This post was last edited by Desert Fish on 2015-10-8 at 19:26. Our company also produces triphenyls. The triphenyl used as raw material for producing heat transfer oil in our company is a by-product of our own products, so it does not need to be purchased from outside. We produce a range of products including biphenyl/biphenyl ether/triphenyl (o-meso)/hydrotriphenyl. You can consult us in detail
Can the heat transfer oil after dehydrogenation still be used normally?
After being regenerated, our heat transfer oil can be stored for about 2 months; a highly viscous substance forms at the bottom, but it becomes transparent again when heated. Is this caused by dehydrogenation? Does it affect usage? How should it be handled? Thank you!
Your question is actually better suited to be posted as a separate thread, so that more people can discuss it. I’ve posted it on your behalf; please keep an eye on it. Can heat transfer oil after dehydrogenation still be used normally? http://bbs.hcbbs.com/thread-1472936-1-1.html (Source: Haichuan Chemical Industry Forum)