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Low-temperature swing adsorption device

A technology of pressure swing adsorption and low temperature, which is applied to the device of desorption kinetics and thermodynamic parameters, and measures the adsorption field of gas on the adsorbent. It can solve the problems of long time to reach adsorption equilibrium, low nitrogen adsorption rate, and large diffusion resistance. , to achieve the effect of high accuracy, convenient application and small random error

Inactive Publication Date: 2009-03-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

However, there are certain limitations: the molecular kinetic energy of nitrogen gas at 77K is very low, and the diffusion resistance in micropores equivalent to or smaller than the molecular size of nitrogen molecules is very large, which is difficult to measure, such as on NaA and KA molecular sieves. Adsorption; in addition, the adsorption rate of nitrogen is very low, and it takes a long time for each point on the isotherm to reach adsorption equilibrium

Method used

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Embodiment 1

[0022] figure 1 It is a schematic diagram of the structure of the adsorption measurement device of the present invention. The 4.2KG-M low-temperature refrigerator is used as the cold source, and the first-stage cold head 18 and the second-stage cold head 14 that output the cooling capacity are sealed and set in the stainless steel cavity to ensure sufficient low temperature for the gas measurement and control pipeline. figure 2 It is a three-dimensional view of the structure of the vacuum cavity. The cavity is divided into inner and outer layers. The outer cavity is made of non-magnetic stainless steel and polished internally; the inner cavity is divided into upper and lower sections, and the upper section is made of stainless steel. Annular cavity 17, which can Liquid nitrogen is loaded to assist refrigeration; the lower section is made of copper, which becomes a cold screen and conducts the cooling capacity of liquid nitrogen downward. The contact surfaces of the two are c...

Embodiment 2

[0034] The standard volumetric method is used to measure the surface parameters of porous materials, such as figure 1 As shown, the volume of the reference cell (the carrier gas pipeline above the valve 7) is 21.63ml, placed in a room temperature environment, and try to keep the room temperature constant; the volume of the adsorption chamber 12 is 5.34ml, which contains the adsorbent that needs to be detected. In order to overcome the influence of temperature changes on the pressure sensor in the room temperature environment, thereby affecting the entire experimental data, the changes in room temperature are recorded in real time, and the influence of temperature on pressure is corrected through the actual gas state equation. The refrigerator 21 provides cooling capacity to the adsorption chamber 12, and the temperature fluctuation range is less than 0.1K in a steady state.

[0035] The adsorption chamber 12 in the present embodiment is equipped with an appropriate amount of u...

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Abstract

Disclosed is a cryogenic pressure swing adsorption device, comprising a cryogenic refrigeration machine, a stainless steel multi-layer cavity body, a vacuum pump assembly, a carrier gas pipeline and a matched measurement and control element; wherein, a first stage cold head and a second stage cold head of the cryogenic refrigeration machine are sealed and arranged in the stainless steel cavity body, the vacuum pump assembly vacuumizes the cavity body and the carrier gas pipeline, an adsorption chamber in the carrier gas pipeline is connected with the second stage cold head of the refrigerating machine, the temperature control instrument clings to the adsorption chamber, and a small-sized Rh-Fe resistance thermometer and a ceramic heating sheet are disposed on a red copper seat. The invention has the advantages that: the adsorption chamber can vary continuously and reversibly between 4K and the room temperature; surface parameters such as specific surface area, micropore volume and pore-size distribution of ultra-micropore powder material that can not be measured through nitrogen adsorption can be measured; and the temperature variation in the adsorption chamber between 4K and the room temperature spans critical temperature points of a plurality of gases, and the device can particularly acquire adsorption and desorption behaviors of hydrogen below liquid nitrogen temperature that can not be researched so far.

Description

technical field [0001] The invention relates to the field of subcritical and supercritical adsorption, and especially provides a set of conditions for measuring the adsorption and desorption kinetics and thermodynamics of gas on the adsorbent under the condition that the temperature and pressure can be continuously changed in the range of 4K to room temperature and 0 to 30 MPa respectively. parameter device. Background technique [0002] The adsorption of gas above its critical temperature is called supercritical adsorption. In recent years, the demand for clean fuels such as natural gas and hydrogen has promoted the development of technical theories in this field, but compared with the rapidly developing industrial technology, the theoretical research on supercritical adsorption lags far behind the engineering needs, which is mainly due to Because the type of gas adsorption changes before and after crossing the critical temperature, the basic model applicable below the cri...

Claims

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Application Information

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IPC IPC(8): B01D53/047
Inventor 李静吴二冬
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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