Testing apparatus and method for actual high-pressure adsorption kinetics of adsorbent

A high-pressure adsorption and testing device technology, applied in analytical materials, instruments, etc., can solve problems such as high-pressure kinetics without adsorbents

Active Publication Date: 2017-07-21
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The volumetric method based on the conventional static bed can be used to measure the adsorption isotherm of the adsorbent, but there is no re

Method used

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  • Testing apparatus and method for actual high-pressure adsorption kinetics of adsorbent
  • Testing apparatus and method for actual high-pressure adsorption kinetics of adsorbent
  • Testing apparatus and method for actual high-pressure adsorption kinetics of adsorbent

Examples

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Embodiment 1

[0109] Use a steel ball with a diameter of 7mm to calibrate, and measure the adsorption tube V 2 2 without ball (V 0 =0), add 100 balls (V 0 =17.959mL), add 200 balls (V 0 =35.919mL) when p 1 and p 2 values, and the calculation results are shown in Table 1. Such as image 3 As shown, linear regression was performed on the results, and a=-0.0111, b=1.9815, and a correlation coefficient of 1 were obtained. Calculate V 1 and V 2 90.09mL and 88.42mL, respectively.

[0110] The high-pressure adsorption kinetics of activated carbon was tested at room temperature, and the activated carbon used was Taixi anthracite columnar activated carbon. Leak detection is carried out before the experiment, and the leak detection gas is CO 2 , test temperature T 2 is 288.15K, pressure p 1 It is 1.078MPa, and the leak detection time is 70h. For the leak detection results, see Figure 4 . Analyzing the data, the leak rate δ is 0.05 bar / h.

[0111] Since the test temperature is room tem...

Embodiment 2

[0115] Using the same testing device as in Example 1, the potassium-modified hydrotalcite K-MG30 (Sasol Germany GmbH) was subjected to high-pressure CO at 400°C. 2 Adsorption kinetics were studied. Room temperature T 0 It is 288.15K. Use 30 standard steel balls with a diameter of 7mm (total volume 5.388mL) for hot zone and cold zone calibration. To the adsorption tube V 1 3 and adsorption tube V 2 2 filled with helium pressure p 1 is 1.114MPa, raise it to T 2 (691.15K), get p 2 and p 3 They are 2.252MPa and 2.262MPa respectively. For the temperature rise curve during calibration, see Figure 6 .

[0116] at T 2 Downward adsorption tube V 1 3 respectively filled with pressure p 41.078, 2.132, 3.347MPa CO 2 , measure the corresponding p 5 They are 0.575, 1.149, 1.826MPa respectively. Based on the above data, the hot zone and the cold zone were calibrated, and the results are shown in Table 2. The temperature T of the cold zone is determined by comparison 1 is 3...

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Abstract

The invention provides a testing apparatus and method for actual high-pressure adsorption kinetics of an adsorbent. The method is a volume method based on an improved static bed test system and comprises four steps, i.e., volume calibration, calibration of a hot zone and a cold zone, leak detection, and testing. According to the method provided by the invention, a pressure gauge in a traditional static bed test system is replaced by a high-sensitivity pressure sensor, and the actual high-pressure adsorption kinetic curve of the adsorbent is obtained through inverse computation based on a curve of changes of pressure in an adsorption pipe along with time, so influence of air inflow rates on testing results in traditional testing methods for kinetics of adsorbents is avoided; the concept of the hot zone and the cold zone and a measuring method are provided so as to reduce calculation errors caused by the dead volume of pipelines and the temperature nonuniformity of the adsorption pipe; and the mass of a sample added into the adsorption pipe is controlled so as to allow pressure drop in the process of measuring to be macroscopically small and microscopically great, so accuracy of calculation results is guaranteed, and pressure is approximately considered to be almost unchanged in the process of adsorption.

Description

technical field [0001] The invention belongs to the technical field of adsorbent characterization, and in particular relates to an adsorbent real high-pressure adsorption kinetics test device and method. Background technique [0002] Adsorbent is a solid substance that can effectively absorb certain components in gas, and is widely used in fields that require gas separation and purification, including petroleum, chemical, metallurgy, power generation and other industries. Adsorbents can be divided into normal temperature physical adsorbents (activated carbon, zeolite, silica gel, alumina) according to different conditions of use, normal temperature chemical adsorbents (solid amine, sodium carbonate), medium temperature adsorbents (hydrotalcite, magnesium-based double salt) and high temperature Adsorbent (lithium silicate, lithium zirconate, calcium oxide), etc. The indicators for evaluating the performance of adsorbents mainly include adsorption capacity and adsorption kine...

Claims

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Application Information

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IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 蔡宁生史翊翔朱炫灿
Owner TSINGHUA UNIV
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