Multimodal adsorption performance testing system

Abstract

A multimodal adsorption performance test system includes: a first rapid temperature control unit and a second rapid temperature control unit and a third rapid temperature control unit respectively connected thereto through a T-shaped tube, wherein: the first rapid temperature control unit is provided with an adsorbate to be tested, and the second rapid temperature control unit is provided with an adsorbent, and a multimodal adsorption performance test is achieved by simultaneously or independently controlling the boiling temperature and flow rate of the adsorbate to be tested, the steam temperature and flow rate, and the adsorption temperature of the adsorbent. This system can realize the dynamic and static characteristics test of the adsorption amount of various adsorption working pairs under the condition of rapid temperature rise and fall; can effectively reduce the experimental time; and can realize the dynamic and static characteristics test of the adsorption amount of various adsorption working pairs under the condition of large temperature range.

Description

Technical Field

[0001] The invention relates to a technology in the field of adsorption measurement, in particular to a static and dynamic adsorption performance measurement system capable of realizing rapid temperature rise and fall conditions. Background Art

[0002] The adsorption and desorption of adsorbents at a certain temperature are measured. Therefore, thermogravimetric instruments are widely used in inorganic ceramics, metal materials, plastics, rubber, coatings, drugs and composite materials. They can be used to study the decomposition kinetics, thermal stability, oxidation stability, adsorption and desorption, component analysis, volatile content analysis, and quantitative analysis of filler content.

[0003] The existing equipment testing technology has the following problems: 1) It can only measure the adsorption and desorption performance of gases with higher boiling points such as nitrogen and carbon dioxide, but cannot measure the adsorption and desorption performance of low-boiling-point working fluids, such as water vapor, acetone vapor, ethanol vapor, etc., because the low-boiling-point working fluid vapor will condense on the inner wall of the pipeline, container, etc., and thus cannot measure the performance; 2) It can only adsorb granular adsorbents such as spheres and cylinders, but cannot measure the adsorption performance of many newly developed new high-efficiency powdered adsorbents such as MOFs (metal organic framework) adsorbents, because the nitrogen and carbon dioxide gases in the gas cylinder will blow away the powdered adsorbents. 3) It can only inversely calculate the real high-pressure adsorption kinetic curve of the adsorbent based on the pressure change curve in the adsorption tube over time, but cannot measure the static characteristics of the adsorbent, the desorption static characteristics of the adsorbent, and the desorption dynamic characteristics of the adsorbent; 4) The adsorbed gas is a high-pressure cylinder gas, such as carbon monoxide, carbon dioxide, oxygen, nitrogen, etc. It is impossible to measure the adsorption and desorption performance of low-boiling-point working fluids, such as water vapor, acetone vapor, ethanol vapor, etc., because the low-boiling-point working fluid vapor will condense on the inner walls of pipelines and containers. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention proposes a multimodal adsorption performance testing system, which can realize the dynamic and static characteristics testing of the adsorption amount of various adsorption working pairs under rapid temperature rising and falling conditions; can effectively reduce the experimental time; and can realize the dynamic and static characteristics testing of the adsorption amount of various adsorption working pairs under large temperature range conditions.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention relates to a multimodal adsorption performance testing system, comprising: a first rapid temperature control unit and a second rapid temperature control unit and a third rapid temperature control unit respectively connected to the first rapid temperature control unit through a T-shaped tube, wherein: an adsorbate to be tested is arranged in the first rapid temperature control unit, and an adsorbent is arranged in the second rapid temperature control unit, and the multimodal adsorption performance testing is realized by simultaneously or independently controlling the boiling temperature and flow rate of the adsorbate to be tested, the steam temperature and flow rate, and the adsorption temperature of the adsorbent.

[0007] The adsorbent includes but is not limited to: metal organic framework adsorbent (MOFs), physical adsorbents such as activated carbon in any form including powder, silica gel, molecular sieve, physical adsorbent mixed adsorbent, composite adsorbent formed by physical adsorbent-chemical adsorbent, etc.

[0008] The adsorbents to be tested include: low boiling point working fluids such as water vapor, ethanol, methanol, acetone, and Freon; and high boiling point working fluids such as carbon dioxide, nitrogen oxides (NOx), carbon monoxide, nitrogen, and volatile organic compounds (VOCs).

[0009] The T-shaped tube is provided with a valve and an electric heating bag is provided on the outside. The T-shaped tube and the valve are heated by the electric heating bag to ensure that the low-boiling point adsorbent does not condense on the inner wall.

[0010] The T-shaped tube is further connected to the vacuum pumping device through a second valve.

[0011] The first rapid temperature control unit comprises: a first temperature rise and fall box and a first adsorbent storage shell connected thereto, wherein: an adsorbent heat transfer shell is arranged outside the first adsorbent storage shell connected to the T-tube, and the adsorbent to be tested is arranged in the first adsorbent storage shell.

[0012] The second rapid temperature control unit comprises: a second temperature-lowering box and an adsorbent storage shell connected thereto, wherein: an adsorbent heat transfer shell is arranged outside the adsorbent storage shell connected to the T-shaped tube.

[0013] The adsorbent storage shell is provided with a first pressure sensor and a first temperature sensor.

[0014] The third rapid temperature control unit comprises: a third temperature rise and fall box and a second adsorbent storage shell connected thereto, wherein: an adsorbent steam heat transfer shell is arranged outside the adsorbent storage shell connected to the T-shaped tube.

[0015] The second adsorbent storage shell is provided with a second pressure sensor and a second temperature sensor.

[0016] Technical Effects

[0017] The present invention realizes different adsorption conditions through temperature control and scientific design of system structure, and can measure adsorbents in any form, including powdered adsorbents; it can measure a variety of adsorbates, including the adsorption and desorption properties of low-boiling-point working fluids, such as water vapor, acetone vapor, ethanol vapor, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the invention structure;

[0019] In the figure: a first temperature-cold-and-turn box 1, a second temperature-cold-and-turn box 2, a first pressure sensor 3, a first temperature sensor 4, an adsorbent storage shell 5, an adsorbent heat transfer shell 6, an adsorbent 7, a valve 8, an electric heating package 9, an adsorbent heat transfer shell 10, a first adsorbent storage shell 11, a second pressure sensor 12, a second temperature sensor 13, an adsorbent steam heat transfer shell 14, a second adsorbent storage shell 15, a third temperature-cold-and-turn box 16, a second valve 17, an adsorbent 18, a second rapid temperature control unit 19, a third rapid temperature control unit 20, and a first rapid temperature control unit 21. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, this embodiment relates to a multimodal adsorption performance testing system, including: a first rapid temperature control unit 21 and a second rapid temperature control unit 19 and a third rapid temperature control unit 20 respectively connected thereto through a T-shaped tube, wherein: the third rapid temperature control unit is provided with an adsorbate to be tested 18, and the second rapid temperature control unit 19 is provided with an adsorbent 7.

[0021] The second rapid temperature control unit 19 includes: a first pressure sensor 3, a first temperature sensor 4, an adsorbent storage shell 5 and an adsorbent heat transfer shell 6, wherein: the bottom pipeline of the second temperature reduction box 2 is connected to the bottom of the adsorbent heat transfer shell 6, the upper pipeline of the second temperature reduction box 2 is connected to the upper part of the adsorbent heat transfer shell 6, the first pressure sensor 3 is connected to the top of the second rapid temperature control unit 19, the first temperature sensor 4 is connected to the top of the second rapid temperature control unit 19, and the adsorbent 7 is stored in the adsorbent storage shell 5.

[0022] The third rapid temperature control unit 20 includes: a second pressure sensor 12, a second temperature sensor 13, an adsorbent vapor heat transfer shell 14 and a second adsorbent storage shell 15, wherein: the adsorbent storage shell 5 is connected to the second adsorbent storage shell 15 through a pipeline, the connecting pipe is wrapped with an electric heating bag 9, the second pressure sensor 12 is connected to the top of the adsorbent vapor unit, the second temperature sensor 13 is connected to the top of the third rapid temperature control unit 20, the bottom pipeline of the third temperature rise and fall box 16 is connected to the bottom of the adsorbent vapor heat transfer shell 14, and the upper pipeline of the third temperature rise and fall box 16 is connected to the upper part of the adsorbent vapor heat transfer shell 14.

[0023] The first rapid temperature control unit 21 includes: an adsorbent heat transfer shell 10 and a first adsorbent storage shell 11, wherein: the top of the first rapid temperature control unit 21 is connected to the second rapid temperature control unit 19 and the third rapid temperature control unit 20 respectively through an ascending pipeline, an electric heating bag 9 is wrapped on the pipeline, a valve 8 is installed on the ascending pipeline, and a second valve 17 is installed on the ascending pipeline branch pipe. The bottom pipeline of the first temperature reduction box 1 is connected to the bottom of the adsorbent heat transfer shell 10, and the upper pipeline of the first temperature reduction box 1 is connected to the upper part of the adsorbent heat transfer shell 10.

[0024] The working process of this system is as follows:

[0025] Step 1) The first rapid temperature control unit is heated to a temperature T1, wherein T1 is 100°C to 150°C.

[0026] Step 2) Open valve 8, open the second valve 17, and use a vacuum pump to evacuate the system to a vacuum degree of less than 10 - 6 Pa.

[0027] Step 3) Close the valve 8, fill the first rapid temperature control unit 21 with the adsorbent, and close the second valve 17.

[0028] Step 4) The first rapid temperature control unit 21 controls the temperature and pressure to be T2 and P1 respectively, wherein: T2 is -20°C to 20°C, and p1 is the saturation pressure of the adsorbate at T1.

[0029] Step 5) The temperature of the first rapid temperature control unit is controlled at T3, wherein: T3 is -30°C to 30°C.

[0030] Step 6) Open the valve 8, the pressures of the second rapid temperature control unit 19 and the third rapid temperature control unit 20 both reach P1, and the temperature of the second rapid temperature control unit is controlled at T4, wherein: T4 is 40°C to 200°C.

[0031] Step 7) The temperature of the electric heating package is controlled at T4-5°C.

[0032] Step 8) The temperature of the second rapid temperature control unit 19 can be quickly heated, quickly cooled, slowly heated, or slowly cooled to T3' and the pressure reaches P3', where: T3' is 40°C to 200°C, and P3' is below 5Mpa.

[0033] Step 9) The temperature of the third rapid temperature control unit 20 is stabilized at T4' and the pressure reaches P4', wherein: T4' is 40°C to 200°C, and P4' is below 5Mpa.

[0034] The present invention obtains the static and dynamic adsorption performance of the adsorbate to be tested in the first rapid temperature control unit under the rapid temperature rise and fall conditions, that is, Where: V1 is the volume of the second rapid temperature control unit 19, in m 3 ; V2 is the volume of the third rapid temperature control unit 20, in m 3 ; R is the gas constant 8.314 J·mol -1 ·K -1 .

[0035] As shown in the following table, the adsorption / desorption amount measured and calculated under different dynamic and static conditions

[0036]

[0037] Compared with the existing technology, this system achieves different adsorption conditions through temperature control, and the test system can test the static or dynamic adsorption characteristics of various forms; through the scientific design of the system structure, the test system can adsorb a variety of adsorbents, including low-boiling point working fluids.

[0038] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A multimodal adsorption performance testing system, characterized in that: include: A first rapid temperature control unit and a second rapid temperature control unit and a third rapid temperature control unit respectively connected thereto through a T-shaped tube, wherein: the first rapid temperature control unit is provided with an adsorbate to be tested, and the second rapid temperature control unit is provided with an adsorbent, and a multi-modal adsorption performance test is achieved by simultaneously or independently controlling the boiling temperature and flow rate of the adsorbate to be tested, the steam temperature and flow rate, and the adsorption temperature of the adsorbent; The T-shaped tube is provided with a valve and an electric heating package is provided on the outside. The electric heating package heats the T-shaped tube and the valve to ensure that the low-boiling point adsorbent does not condense on the inner wall; The first rapid temperature control unit comprises: a first temperature rise and fall box and a first adsorbent storage shell connected thereto, wherein: an adsorbent heat transfer shell is arranged outside the first adsorbent storage shell connected to the T-shaped tube, and the adsorbent to be tested is arranged in the first adsorbent storage shell; The second rapid temperature control unit comprises: a second temperature-lowering box and an adsorbent storage shell connected thereto, wherein: an adsorbent heat transfer shell is arranged outside the adsorbent storage shell connected to the T-shaped tube; The third rapid temperature control unit comprises: a third temperature rise and fall box and a second adsorbent storage shell connected thereto, wherein: an adsorbent steam heat transfer shell is arranged outside the adsorbent storage shell connected to the T-shaped tube.

2. The multimodal adsorption performance testing system according to claim 1, characterized in that: The adsorbents include: physical adsorbents, physical adsorbent mixed adsorbents, and composite adsorbents formed by physical adsorbents and chemical adsorbents; The adsorbent to be tested includes: water vapor, ethanol, methanol, acetone, freon, carbon dioxide, nitrogen oxides, carbon monoxide, nitrogen or volatile organic matter.

3. The multimodal adsorption performance testing system according to claim 1, characterized in that: The T-shaped tube is further connected to the vacuum pumping device through a second valve.

4. The multimodal adsorption performance testing system according to claim 1, characterized in that: The adsorbent storage shell is provided with a first pressure sensor and a first temperature sensor.

5. The multimodal adsorption performance testing system according to claim 1, characterized in that: The second adsorbent storage shell is provided with a second pressure sensor and a second temperature sensor.

6. The multimodal adsorption performance testing system according to claim 1, characterized in that: The static and dynamic adsorption performance of the adsorbate to be tested in the first rapid temperature control unit under rapid temperature rise and fall conditions, that is, Where: V1 is the volume of the second rapid temperature control unit, unit m 3 ; V2 is the volume of the third rapid temperature control unit, unit m 3 ; R is the gas constant 8.314 J·mol -1 ·K -1 , the pressure parameters P1, P3` and P4` and the temperature parameters T3, T4, T3` and T4` are determined by: Step 1) The first rapid temperature control unit is heated to a temperature T1, wherein T1 is 100° C. to 150° C.; Step 2) Open the valve, open the second valve, and use a vacuum pump to evacuate the system to a vacuum degree of less than 10 -6 Pa; Step 3) the valve is closed, the first rapid temperature control unit is filled with adsorbent, and the second valve is closed; Step 4) The first rapid temperature control unit controls the temperature and pressure to T2 and P1, respectively, wherein: T2 is -20°C to 20°C, and P1 is the saturation pressure of the adsorbate at T1; Step 5) The temperature of the first rapid temperature control unit is controlled at T3, wherein: T3 is -30°C to 30°C; Step 6) Open the valve, the pressures of the second rapid temperature control unit and the temperature control unit both reach P1, and the temperature of the second rapid temperature control unit is controlled at T4, wherein: T4 is 40°C to 200°C; Step 7) The temperature of the electric heating package is controlled at T4-5°C; Step 8) The temperature of the second rapid temperature control unit is rapidly heated, rapidly cooled, slowly heated, or slowly cooled to T3' and the pressure reaches P3', wherein: T3' is 40°C to 200°C, and P3' is below 5Mpa; Step 9) The temperature of the third rapid temperature control unit is stabilized at T4' and the pressure reaches P4', wherein: T4' is 40°C to 200°C, and P4' is below 5Mpa.

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