Low volatility thermal oil is represented by its initial boiling point to indicate its volatility. Thermal conductive hot oil used in open heating systems, if the initial boiling point is lower than the operating temperature, can easily cause cavitation of the pump, gas resistance in the operating system, and excessive evaporation losses. The high initial boiling point of thermal oil results in low vapor pressure and volatilization loss, ensuring smooth system operation.
Alkylbenzene type (benzene ring type) heat transfer oil is a type of compound with a branched chain of alkane attached to the benzene ring. It belongs to the product of short branched alkane groups (including methyl, ethyl, isopropyl) combined with the benzene ring. Its boiling point is between 170~180 ℃ and its freezing point is below -80 ℃, so it can be used as an antifreeze. The characteristic of this type of product is that it is not easy to precipitate within the applicable range, and compounds with isopropyl attached chains are particularly good.

This type of heat transfer oil is a low melting mixture of biphenyl and diphenyl ether, consisting of 26.5% biphenyl and 73.5% diphenyl ether. The melting point is 12 ℃, and the earliest synthetic aromatic heat transfer oil used in the world is Dowtherm, which is characterized by good thermal stability and high operating temperature (400 ℃). This type of product has heat resistance in organic heat carriers because it is not connected to the alkyl side chain on the benzene ring. This low melting point (12.3 ℃) mixture is more economical to use at room temperature with a boiling temperature range of 256-258 ℃. This is because both substances have high melting points (biphenyl<71 ℃, diphenyl ether<28 ℃). There is no concentration of any component during the steam process formed by the evaporation of this low melting mixture, and the liquid properties remain unchanged. Due to the presence of ether compounds in diphenyl ether, prolonged use at high temperatures (350 ℃) can produce phenolic compounds, which have low corrosiveness and have a certain corrosive effect on carbon steel and other materials when combined with moisture.

Application scope of thermal oil:
1. In the petroleum industry, it is mainly used for heating natural gas and processing, storing, and transporting mineral oil. Refineries use thermal oil to preheat cold materials and have successfully used it for heating solvent and extractant evaporation devices in lubricant manufacturing.
2. In the chemical industry, it is mainly used for distillation, evaporation, polymerization, condensation, de emulsification, lipidation, drying, melting, dehydrogenation, forced insulation, as well as heating synthesis equipment for pesticides, intermediates, anti-aging agents, surfactants, fragrances, etc.
3. In the oil industry, it is mainly used for heating devices such as oil decomposition, fatty acid distillation, lipidation, nitration, hydrogenation reaction, concentration, and vacuum deodorization.
4. In the food industry, it is mainly used for heating bread baking equipment, biscuit baking equipment, candy production equipment, grain drying equipment, edible oil extraction and refining equipment, steaming and boiling pots, high-pressure kettles, and conveyor belt dryers.

Alkyl diphenyl ether type heat transfer oil is a mixture of isomers with one ether group linked between two benzene rings and two methyl groups in each ring. This type of mixed heat transfer oil has low viscosity at low temperatures, good flowability, and is suitable for use in cold northern regions. It is recommended to use at a temperature not exceeding 330 ℃ and a pour point of -54 ℃. Its service life is better than mineral oil and alkylbenzene type heat transfer oil. Base ether type heat transfer oil is commonly used both domestically and internationally, and there are also domestic manufacturers producing this type of high-temperature heat transfer oil.
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