A solvent collection device for a freeze dryer

Abstract

The invention discloses a solvent collection device of a freeze drying machine. The solvent collection device comprises a condensation device, a solvent collection barrel and a vacuum pump, wherein the condensation device comprises a condensation box, a main condenser, a sub condenser and a collection bottom disc; the bottom of the condensation box is inverted cone-shaped; the main condenser, the collection bottom disc and the sub condenser are distributed inside the condensation box from top to bottom; the solvent collection barrel is arranged below the condensation device; the bottommost part of the collection bottom disc communicates with the solvent collection barrel; a drainage valve I is further arranged between the collection bottom disc and the solvent collection barrel; a solvent collection barrel coil is wound and distributed outside the solvent collection barrel; a refrigeration compression and condensation unit is further arranged outside the solvent collection barrel; the solvent collection barrel coil is connected with the refrigeration compression and condensation unit; the vacuum pump is arranged outside the condensation box; a suction opening end of the vacuum pump is arranged at the upper part inside the condensation box in an interpenetrating manner; and an isolating valve I is further arranged between the vacuum pump and the condensation box. According to the solvent collection device of the freeze drying machine, the structure is simple, the operation is stable, the cost is low, the adaptability is high, and secondary evaporation of a solvent during the collection process can be effectively prevented.

Description

technical field [0001] The invention relates to the technical field of refrigeration systems, in particular to a solvent collection device for freeze dryers in cryogenic refrigeration systems of freeze drying technology. Background technique [0002] Vacuum freeze dryer, commonly known as freeze dryer, is a drying equipment widely used in the pharmaceutical and food industries. Its purpose is to freeze substances at low temperatures, sublimate the water in them in a vacuum state, and collect the condensed water by condensation. Moisture in order to achieve the purpose of material drying and dehydration. [0003] In recent years, there have been a large number of biological products, such as proteins, and synthetic chemical drug formulations containing organic solvents as protective agents or additives, such as ethanol. In particular, the use of organic solvents in Chinese herbal medicines is also becoming more and more widespread. It mainly uses organic solvents to impregn...

AI Technical Summary

Problems solved by technology

[0012] 2. Patent No. 201010568051.6 discloses an organic solvent receiving device for the condenser of a lyophilizer. The recovery device described in the patent is designed to be built into the lower space of the condenser, in order to avoid the above-mentioned The defect of patent 200910196210.1, but its essence has not changed: that is, the lower space of the condenser is provided with a slightly inclined arc-shaped cylinder (consistent with the drain direction of the condenser), and the surface temperature of this arc-shaped cylinder is slightly lower than that of patent 200910196210.1 It has improved, but it is still very close to the inner wall of the lower part of the condenser, and is affected by the temperature of the inner wall of the condenser. There is still a large difference between the temperature and the surface temperature of the condenser, and the solvent will evaporate and enter the vacuum pump.

The components controlled by the system have high technical requirements, and the reuse of waste gas energy emissions is difficult to solve. Unless the customer has liquid nitrogen supply chain facilities on site

Therefore, the application adaptability of the liquid nitrogen cooling system is poor

[0016] In summary, the existing technology cannot really effectively prevent the re-evaporation of the organic solvent during the collection process

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