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Low-temperature palladium replacement separation method

A low-temperature, separation column technology, applied in the field of low-temperature palladium displacement separation, deuterium and/or tritium separation of upstream raw materials of thermonuclear reactors, can solve the problems of insufficient hydrogen isotope separation, difficulty in fully separating hydrogen isotopes, etc., and achieve outstanding separation and enrichment effects , fast and effective temperature rise desorption, high heating efficiency

Active Publication Date: 2017-08-18
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature palladium displacement separation method of the present invention can effectively solve the problem that the palladium displacement separation method has insufficient separation effect on hydrogen isotopes in the existing research, and it is difficult to fully separate hydrogen isotopes, and realize the controlled slow-release separation and desorption of hydrogen isotopes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Method for separating hydrogen isotopes by palladium displacement

[0041] Prepare the Palladium Displacement Separation Column:

[0042] Mix 30% palladium and aluminum oxide evenly, and fill it into a stainless steel pipe with an inner diameter of 12 mm. After filling the raw materials, process the stainless steel pipe into a spiral shape with a pipe bender, with a spiral radius of 1.5 meters. At the same time, three fixed connecting rods are evenly welded on the outer circumference of the separation column and the palladium replacement separation column to improve the stability of the helical structure.

[0043] Palladium displacement separation and enrichment process:

[0044] The spiral tubular separation column of the separation column is installed in the liquid nitrogen tank. When the liquid nitrogen tank is filled with liquid nitrogen, the spiral tubular separation column is frozen by liquid nitrogen to reach the temperature of liquid nitrogen. Then, the hyd...

Embodiment 2

[0049] In this embodiment, stainless steel pipes with inner diameters of 6, 8, 10, 12, and 15 mm are used to fill Pd-Al 2 o 3 Filler, the weight ratio of Pd is controlled at 30wt%. The filling length is 45 meters. After filling the replacement raw materials, the stainless steel pipe is bent into a spiral tubular structure. The radius of the overall structure of the spiral pipe is 1.5 meters. The hydrogen isotope separation and enrichment test was carried out according to the method of the above-mentioned Example 1, and the hydrogen gas selected was hydrogen gas with natural abundance (containing 150 ppm deuterium). During the replacement process, the end gas pressure, pulling speed, heating power, heating frequency, etc. were the same as those in Example 1 when hydrogen was charged.

[0050] The test results show that the hydrogen separation efficiency of palladium displacement separation columns made of stainless steel pipes with different inner diameters will change due to...

Embodiment 3

[0053] This embodiment adopts the stainless steel pipe material of 12mm internal diameter as the basic stainless steel pipe material, fills Pd-Al thereinto 2 o 3 Filler, wherein the weight ratio of Pd is controlled at 20%, 25%, 30%, 35%, 40%. The parameter design of the embodiment is used to carry out the research on the separation of hydrogen isotopes.

[0054] When fillers with different palladium content ratios are selected, there are certain fluctuations in the deuterium content abundance in the finally separated hydrogen. When the palladium content is low, the sufficient adsorption efficiency is low, and the concentration of deuterium obtained after separation is low. Properly increasing the content ratio of metal palladium can enhance the separation efficiency. When the palladium content exceeds 35%, due to the excessive palladium content, the corresponding aluminum oxide content ratio decreases, and the loading capacity decreases, and some metal palladium cannot be fu...

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Abstract

The invention discloses a method for separating hydrogen isotope in the manner of palladium replacement. The method comprises the following steps: 1) cooling, namely soaking a raw material column and a palladium replacement separating column into liquid nitrogen and cooling to liquid nitrogen temperature, wherein the raw material column and the palladium replacement separating column are arranged as stainless steel pipes which are connected with each other and are communicated with each other and thus hydrogen is conveniently introduced into the columns and can flow and separate therein; 2) adsorbing hydrogen, namely introducing hydrogen into the raw material column, and adsorbing hydrogen till completing adsorption at low temperature; 3) separating at low temperature, namely separating the raw material column and the palladium replacement separating column from liquid hydrogen, thereby avoiding the corresponding low-temperature treatment; 4) transferring to the separating column, namely heating the raw material column for naturally separating hydrogen therein and guiding the separated hydrogen into the palladium replacement separating column; 5) replacing, separating and collecting, namely heating the palladium replacement separating column in the same manner, collecting gas flowing out from the separating column in segments, and analyzing gas composition for confirming a separation coefficient.

Description

technical field [0001] The invention relates to an isotope separation method, in particular to a low-temperature palladium displacement separation method, and belongs to the research field of deuterium and / or tritium separation technology for upstream materials of thermonuclear reactors. Background technique [0002] Displacement chromatography separates hydrogen isotopes by using the hydrogen isotope effect of the packing material in the separation column. Because hydrogen isotopes can undergo reversible combination reactions with filling materials to form solid metal hydrides, and then release different hydrogen isotopes sequentially under suitable conditions, so the separation of hydrogen isotopes can be achieved by the above method. [0003] In the process of displacement chromatography separation, hydrogen molecules are adsorbed on the surface of metal materials, and then enter the interior of metal materials to form solid solutions with metal atoms. Due to the differen...

Claims

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Application Information

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IPC IPC(8): B01D59/00B01D59/16B01D59/32
CPCB01D59/00B01D59/16B01D59/32
Inventor 杨莞罗德礼邓立宋江锋姚勇徐远翔喻彬胡俊何康昊陈华明
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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