High vacuum distillation purification device

Abstract

The invention relates to a high vacuum distillation purification device which comprises a falling film evaporator, a gas-liquid separator, a U-shaped tube heater, a U-shaped tube condenser, a material circulating pump, a liquid-accepting tank, a cold trap, and a vacuum pump unit, and is characterized in that the gas-liquid separator is directly connected to the falling film evaporator and the U-shaped tube condenser, and the U-shaped tube heater is disposed at the bottom of the gas-liquid separator. The beneficial effect of the device of the invention is that: the adoption of a directly-connected compact structure, a large-diameter heating tube of the falling film evaporator, and a built-in condenser reduces the airflow resistance inside the device, decreases the air capacity leaked by the device, and guarantees the realization of a high vacuum degree; the material is evaporated by a falling film, which has the advantages of high heat transfer efficiency, great processing capacity, difficult scaling, and the like; situations such as thermal polymerization or thermal decomposition are effectively reduces, and the device has the advantages of high product yield and quality; the device has certain energy saving effect; in addition, the device has a simple structure, low cost, and flexible operation, and is applicable to both continuous operation and intermittent operation.

Description

technical field [0001] The invention relates to a high-vacuum distillation and purification device, which can be applied to the distillation and purification of high-boiling and heat-sensitive substances in the pharmaceutical and chemical industry. Background technique [0002] At present, known high vacuum distillation devices include molecular distillation, short path distillation, etc., which are suitable for distillation and purification with a vacuum degree below 1.33Pa. For substances that need to be distilled and purified in the range of vacuum 1.33-266Pa, if molecular distillation and short-path distillation devices are used, the investment and operation costs of the devices will be high, and the processing capacity of the above two devices is relatively small. The distillation purification of the above-mentioned substances usually adopts a conventional vacuum kettle distillation device. There are generally two types of vacuum still distillation units. One is compo...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a high-vacuum distillation purification device to overcome the low heat transfer efficiency, small processing capacity, and easy oxidation, polymerization, coking, carbonization or cracking of materials in the high-vacuum distillation device of the prior art And the disadvantages of low product yield and content

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