Vapor phase heat transfer oil and its preparation process

Abstract

The invention discloses a gas-phase heat-conducting oil and a preparation process thereof. The gas-phase heat-conducting oil contains alkyl diphenyl and its isomer compounds. The preparation process of gas-phase heat transfer oil includes the following steps: 1. Raw material selection. The raw material selected in this step is the tower bottom material after the catalytic reforming unit in the petroleum refining process or the polyester production raw material p-xylene plant tower bottom material or pyrolysis production Hydrogenation feedstock for ethylene by-products. 2. Extraction of aromatics. In this step, chemical products such as benzene and xylene are obtained, and the remaining products are the primary raw materials for gas-phase heat transfer oil. 3. Precision rectification and purification. In this step, the preliminary raw materials obtained in step 2 are purified, and the fraction at 240°C-270°C is selected, and then the above fraction is sent to a high-efficiency precision rectification tower for further rectification, and the fraction at 252°C-258°C is cut. Narrow cut, ie the final vapor phase heat transfer oil product. This vapor phase heat transfer oil product can completely replace the existing but biphenyl-diphenyl ether products (for example: vp-1, DowthermA, ThermS, ThermS-300 and other foreign vapor phase heat transfer oils).

Description

Technical field: [0001] The invention relates to the technical field of heat conduction, and specifically provides a gas-phase heat conduction oil and a preparation method thereof. Background technique: [0002] In the traditional gas phase heat conduction system, biphenyl-biphenyl ether mixture is often used as the gas phase heat carrier for heating. However, biphenyl-biphenyl ether products (for example: vp-1, DowthermA, ThermS, ThermS-300 and other foreign vapor phase heat transfer oils) have very obvious defects: [0003] 1. Pollution to the environment. [0004] The biphenyl-diphenyl ether mixture has an unpleasant odor. During high-temperature spinning heating, due to the high permeability of biphenyl-diphenyl ether, even if the containers, flanges, valves, etc. are tightly sealed, there are still some The gas leakage of the biphenyl-biphenyl ether mixture pollutes the factory environment and poses hidden dangers to safe production. Users urgently need a green and e...

AI Technical Summary

Problems solved by technology

[0018] The use cost of biphenyl-biphenyl ether mixture is very high, and the average ton price is about 30,000 yuan / ton, which increases the cost of the factory

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