Molecular distillating machine

Abstract

The invention discloses a molecular distillating machine, belonging to the field of medicine biochemical engineering equipment. The molecular distillating machine comprises a base, an evaporator, a condenser, a cover and a film scraping device, wherein the evaporator and the condenser are arranged on the base, the cover is arranged at the upper part of the evaporator and is provided with a feed pipe, and the film scraping device is connected to the cover. A rotating cage is arranged in a cavity between the evaporator and the condenser, and the condenser comprises an upper pipe seat ring, a lower pipe seat ring, a set of cooling medium lead-in pipes and a set of cooling medium eduction pipe. The molecular distillating machine is characterized in that at least one middle isolation disc is arranged in the height direction of the cooling medium lead-in pipes and the cooling medium eduction pipes, a recovery hole is arranged on the middle isolation disc, a recovery pipe used for leading out liquid materials in the middle isolation disc is connected with the recovery hole, and the cooling medium lead-in pipes and the cooling medium eduction pipes penetrate through the middle isolation disc. The invention has the advantages that the middle isolation disc collects condensate in advance, liquid film thickening is avoided in a process that the condensate flows downwards, temperature and resistance on the surface of the liquid film are ensured not to be increased, and the condensing effect of the liquid film is efficiently improved.

Description

technical field [0001] The invention belongs to the technical field of medical biochemical equipment, and in particular relates to a molecular distillation machine, which is suitable for the separation of organic mixtures with high boiling point, high viscosity and heat sensitivity and natural products. Background technique [0002] Molecular distillation is usually called short-path distillation, and accordingly, molecular distillation machine is usually called short-path distillation. The so-called short-path distillation is a special liquid-liquid separation technology carried out under high vacuum (residual gas pressure is less than 10pa). , the evaporated molecules escape the liquid film after being heated and condense rapidly on the built-in condenser after a short distance, which overcomes the constraints of the vapor-liquid balance in the conventional distillation and evaporation, so that the short-path distillation process always maintains a high mass transfer drivi...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the above-mentioned molecular distillation machine is that the structure of the condenser 4 is unreasonable, because the steam molecules produced by the evaporation of the evaporator 2 reach the condensation of the condenser 4 After the surface is condensed, it flows continuously along the condensation surface of the condenser 4 under the action of gravity, and finally collects at the bottom of the condenser 4

When the liquid film becomes thicker, the heat transfer resistance increases, the surface temperature of the liquid film rises, and the steam is condensed in a timely and effective manner, resulting in a significant drop in separation efficiency.

[0006] In addition, the above-mentioned molecular distillation machine also has shortcomings in that: the structure of the rotating cage 31 of the wiper 3 is unreasonable, because the rotating cage 3 that constitutes the wiper 3 The function of the receiving tray 311 of the cage 31 is to distribute the material to the inner wall of the evaporator 2. However, since the material introduced from the feed pipe 51 is relatively concentrated, the flow rate of the material, that is, the material liquid, is relatively large, and the receiving tray 311 often cannot distribute the material to the inner wall of the evaporator 2. The material is evenly sprinkled on the inner wall 21, so that the material needs to be scraped for a long time by the scraper roller 316 to form a thin film with uniform thickness in the circumferential direction, that is, a liquid film, which is greatly reduced. The utilization rate of the evaporation surface of the evaporator 2, that is, the inner wall 21, not only reduces the separation efficiency, but also wastes energy

[0007] And, the defect of the above-mentioned molecular distillation machine also lies in: when the scraping film roller 316 scrapes the material on the inner wall 21 evenly, there must be liquid Droplet splashing phenomenon, and steam molecules will also entrain a large number of droplets when they fly to the condenser 4 in a jet manner. After these droplets are collected on the condenser 4, the purity of the product will be seriously affected, and the liquid-liquid separation effect will be reduced.

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