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A method for efficient deep recovery of hydrogen/deuterium in hydrogen/lithium deuteride

A lithium deuteride, deep technology, applied in the field of nuclear technology applications, can solve the problem of lowering the reaction temperature, etc., to achieve the effect of low reaction temperature, easy handling, and small residue

Active Publication Date: 2021-10-26
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

Compared with the two materials, for the deep recovery of hydrogen / deuterium from hydrogen (deuterium) lithium, inorganic oxides are a better choice, but how to further reduce the reaction temperature and improve the recovery rate is the difficulty of this method

Method used

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  • A method for efficient deep recovery of hydrogen/deuterium in hydrogen/lithium deuteride
  • A method for efficient deep recovery of hydrogen/deuterium in hydrogen/lithium deuteride
  • A method for efficient deep recovery of hydrogen/deuterium in hydrogen/lithium deuteride

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Experimental program
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Effect test

Embodiment 1

[0038] refer to figure 1 Install the device, evacuate the system to 2Pa, charge to 1.5MPa and keep the pressure for 1h, check for leaks until the leak rate is less than 1.0×10 -9 ·Pa·m3·s -1 for later use. Mesoporous silica SBA-15 (density less than 1g / cm 3 ) heated to 500°C under air atmosphere, calcined at high temperature for 0.5h, and pulverized to less than 100nm. The calcined mesoporous silica SBA-15 and lithium deuteride were uniformly mixed according to the weight ratio of 64:36, and the mixture was pressed into a sheet at a pressure of 25Mpa under the condition of nitrogen protection and loaded into the reactor. Connect the reactor to the system and evacuate the system to below 2Pa, heat to 300°C and lithium deuteride begins to decompose and release deuterium gas. Store the decomposed deuterium gas in a gas standard tank, and use a pressure sensor to record the pressure of the gas. When the pressure value does not change (600°C), the reaction is considered to be o...

Embodiment 2

[0043] Evacuate the system to 2Pa, charge to 1.5MPa and keep the pressure for 1h, the leak rate is less than 1.0×10 -9 ·Pa·m 3 ·s -1 for later use. Microporous silica / alumina MCM-41 (density less than 1g / cm 3 ) heated to 450°C under air atmosphere, calcined at high temperature for 0.5h, and pulverized to less than 100nm. The calcined microporous silica / alumina MCM-41 and lithium deuteride are evenly mixed according to the weight ratio of 79:21, and the mixture is pressed into a sheet at a pressure of 25Mpa under the condition of nitrogen protection and loaded into the reactor. Connect the reactor to the system and evacuate the system to below 2Pa, heat to above 350°C, lithium deuteride begins to decompose and release deuterium gas. Store the decomposed deuterium gas in a gas standard tank, and use a pressure sensor to record the pressure of the gas. When the pressure value does not change (600°C), the reaction is considered to be over. Chromatography is used to analyze th...

Embodiment 3

[0048] Evacuate the system to 2Pa, charge to 1.5MPa and keep the pressure for 1h, the leak rate is less than 1.0×10 -9 ·Pa·m 3 ·s -1 for later use. Mesoporous silica SBA-15 (density less than 1g / cm 3 ) heated to 500°C under air atmosphere, calcined at high temperature for 0.5h, and pulverized to less than 100nm. The calcined mesoporous silica SBA-15 lithium hydride was uniformly mixed according to the weight ratio of 60:40, and the mixture was pressed into a sheet at a pressure of 25Mpa under the condition of nitrogen protection and loaded into the reactor. Connect the reactor to the system and evacuate the system to below 2Pa, heat to above 330°C, lithium hydride begins to decompose and release hydrogen. Store the decomposed hydrogen in a gas standard tank, and use a pressure sensor to record the pressure of the gas. When the pressure value does not change (610°C), the reaction is considered to be over. Chromatography is used to analyze the composition of the gas and the...

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Abstract

The invention discloses a method for efficiently and deeply recovering hydrogen / deuterium in hydrogen / lithium deuteride. The method comprises the following steps: 1) preparation of a reaction system; 2) leak rate inspection of a reaction device; 3) pretreatment of reactants ; 4) material mixing; 5) hydrogen release by heating; 6) post-reaction treatment. Wherein step 5) the activator that heating reaction step adopts is porous oxide, is selected from the one in mesoporous silica SBA-15, microporous silica / alumina MCM-41, MCM-22, mesoporous titanium dioxide Or several. The method of the invention has the advantages of simple operation, low cost, can be used in large-scale experiments, low reaction temperature, high recovery efficiency of hydrogen isotope, small residual amount of hydrogen in the product, single composition of the product, environmental friendliness, and convenient treatment.

Description

technical field [0001] The invention belongs to the application field of nuclear technology, and specifically relates to a method for efficiently and deeply recovering hydrogen / deuterium in hydrogen / lithium deuteride. Background technique [0002] Lithium hydrogen (deuterium) is an important nuclear energy material and hydrogen (deuterium) storage material, which is used in nuclear chemistry and energy industries. In some application scenarios, the hydrogen / deuterium in it needs to be recovered. However, the thermal stability of lithium hydrogen (deuterium) is very high, and the decomposition temperature reaches 850°C, so the hydrogen / deuterium in it cannot be recovered under mild conditions. The method of adding an activator is usually used to activate the hydrogen (deuterium) lithium, so that it can decompose and decompose hydrogen / deuterium at a lower temperature, so as to achieve the purpose of recovering the hydrogen / deuterium gas. At present, two types of materials ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/00G21F9/30
CPCG21F9/007G21F9/30
Inventor 把静文熊义富巫泉文闫霞艳李瑞敬文勇刘卫东
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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