Liquid phase cascade rectification device for isotope separation

Abstract

The invention discloses a liquid phase cascade rectifying device for isotope separation, which pertains to the technical field of separation and rectification equipment. The rectifying device comprises a group of rectifying towers which are mutually connected through pipes and each rectifying tower comprises a bottom reboiler, a first pipe, a first overhead condenser, a second overhead condenser, a liquid storage tank, a vapor pipe and a reflux pipe. The rectifying device is characterized in that: the first pipe is provided with a liquid circulating mechanism which is applied to leading liquid from a previous stage of rectifying tower to the top of a next stage of rectifying tower; a catch mechanism which is used for separating the liquid which is in the next stage of rectifying tower and led into by the reflux pipe from the liquid fell from the previous stage of rectifying tower is arranged at the lower part of the rectifying tower and the corresponding upper part of the bottom reboiler. The device has the advantages of being conducive to saving energy and guaranteeing separation efficiency.

Description

technical field [0001] The invention belongs to the technical field of separation and rectification equipment, and in particular relates to a liquid-phase cascade rectification device for isotope separation. Background technique [0002] Isotope separation, such as double-labeled water obtained by separating natural water through rectification, because hydrogen has two stable isotopes in nature, namely: 1 H(protium) and 2 H (deuterium); oxygen has three stable isotopes: 16 O (oxygen sixteen), 17 O (oxygen seventeen) and 18 O (oxygen eighteen). Water composed of dihydrogen and oxygen has nine stable isotope molecules, which exist in natural water in different proportions. Due to the extremely small difference in isotope molecules, separation is very difficult. When separating by rectification, a large number of theoretical plates is often required to purify isotope products. At present, the authoritative report on the packing in the rectification column is that the numb...

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Problems solved by technology

[0005] In addition, the above-mentioned device also has the following disadvantages, that is, the liquid returned to the rectifying tower 1 of the previous stage by the return pipe 17 will be mixed with the liquid flowing down in the rectifying tower 1 of the previous stage, That is, the two phases are mixed in the bottom of the rectification tower 1, so that the concentration of the feed liquid at the top of the rectification tower 1 in the next stage is reduced, which affects the separation efficiency

Because the concentration of the return liquid of the rectifying tower 1 of the previous stage is the same as the concentration of the gaseous phase at the top of the rectifying tower 1 of the latter stage, and what flows into the rectifying tower 1 of the latter stage is The liquid condensed by the first overhead condenser 13 of the rectifying tower 1 is actually similar to the liquid phase concentration of the phase equilibrium, so the concentration of the two is different. It is often ignored because it is harmless, but isotope rectification separation is not the case, because the change of the liquid concentration at the top of the rectification tower 1 will directly affect the separation efficiency of the rectification tower

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