Industrial production often operates under high vacuum
In the case of low atmospheric pressure and vacuum, the most widely used are tubular, jacketed, and serpentine. However, in the separation of many fine chemical products, due to the high boiling point of the material, a high-temperature heat source must be used, and the heat-sensitive product undergoes a property change at a high temperature. In order to obtain a qualified product, a lower operating temperature is required. The commonly used measure in industrial production is to operate under high vacuum, and sometimes the operating pressure is only tens of Pascals. Under this condition, it is difficult to meet the requirements with a general heat exchanger as a reboiler. There is a certain degree of liquid layer in the commonly used reboiler, the liquid layer increases the pressure at its bottom, and the liquid layer height in the jacket type and snake tube type reboiler is higher.
Therefore, the commonly used reboiler cannot be used at all at high vacuum conditions. Falling film reboiler can meet the requirements of high vacuum operation, but its biggest drawback is that the wall surface is easy to dry, causing coking and scaling. For this reason, the author designed a high vacuum reboiler device (RMV reboiler device) with a mass transfer function, which can effectively solve the above problems. This new device not only has the function of a common reboiler, but also has a mass transfer function, can be used under normal pressure and high pressure, has a wide range of applications, and has been successfully applied to liquid-liquid evaporation. RMV Reboiler Structure and Principle The design point of the RMV reboiler structure is to allow the liquid phase to overflow from top to bottom through the heating tank layer by layer and finally discharge through the outlet pipe. The vaporized vapor phase boiling in the heating tank is led from the bottom up through the rising port. Therefore, the more the heating tank is located in the upper layer, the larger the area of ​​steam passing through, that is, the smaller the corresponding heating area.
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