High pressure in-situ infrared sample cell and application thereof in CO2-organic liquid system

An in-situ infrared and organic liquid technology, applied in the field of infrared spectroscopy testing, can solve problems such as not being able to meet the experimental conditions, and achieve the effects of reliable measurement data, good CO2 corrosion resistance, and good optical properties

Active Publication Date: 2018-06-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing research, this technology is mainly applied to CO 2 and polymer molecules, CO 2 and organic powder research, the experimental method can not meet the CO 2 Experimental

Method used

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  • High pressure in-situ infrared sample cell and application thereof in CO2-organic liquid system
  • High pressure in-situ infrared sample cell and application thereof in CO2-organic liquid system
  • High pressure in-situ infrared sample cell and application thereof in CO2-organic liquid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1, high-pressure in-situ infrared sample cell

[0052] The physical figure of the high-pressure in-situ infrared sample cell of the present invention is as follows figure 1 As shown, the schematic diagram of the structure is shown in figure 2 As shown, it can be seen that the sample cell includes a stainless steel shell, and a circular hole (not marked) with a diameter of 1 cm is set at its central position, and the two ends of the circular hole are encapsulated by a ZnS infrared window 1, The adoption of the ZnS infrared windows 1 helps ensure that the sample cell has good optical properties, and the distance between the ZnS infrared windows 1 is 30 μm. The distance between two ZnS infrared windows 1 is controlled by an annular gasket 2 placed between them, and the material of gasket 2 is selected to be resistant to CO 2 Corroded PTFE. The stainless steel shell is provided with a sample inlet 3 and a sample outlet 4 communicating with the round hole, an...

Embodiment 2

[0055] Embodiment 2, the influence of the distance between the ZnS infrared windows in the sample pool on the infrared spectrum

[0056] The spectral resolution is closely related to the distance between the two ZnS infrared windows of the sample cell. If the distance is too large, a large number of saturation peaks will appear in the spectrum (such as Figure 4 As shown), the analysis accuracy requirements cannot be met; if the distance is too small, the amount of the detected sample will be insufficient and the signal will be weak. After many experiments, according to the characteristics of the experimental samples, it is found that the effect is better when the distance between two ZnS infrared windows is 30 μm to 5 mm, and the best effect is when the distance is 30 μm.

[0057] Figure 4 is CO 2 In the infrared spectrum under the conditions of 313.15K and 9MPa (the distance between the windows of the in-situ infrared sample cell is 0.5cm), it can be seen from the figure ...

Embodiment 3

[0061] Embodiment 3, supercritical CO 2 Infrared Absorption Spectrum Detection

[0062] Figure 6 is the temperature of 318.15K, CO 2 Infrared absorption spectrum at atmospheric pressure and 7.50 MPa (measured using the high-pressure in-situ infrared sample cell of Example 1 of the present invention). due to ν 1 is CO 2 Molecular symmetric stretching vibration peak (symmetric stretching vibration), the peak position is about 1400cm -1 , ν 2 for CO 2 The double normal vibration peak of the molecule (double normal vibration), the peak position is at 600-700cm -1 , under experimental conditions, ν 1 and ν 2 Peak not detected. therefore, Figure 6 ν does not appear in 1 and ν 2 peak. at 2359cm -1 、3514cm -1 and 3718cm -1 Three absorption peaks were detected, according to the CO in Table 1 2 The absorption frequency of the infrared absorption peak, Figure 6 , the three absorption peaks are CO 2 The asymmetric vibration absorption peak ν of 3 , Additive peak 2ν...

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Abstract

The invention discloses a high pressure in-situ infrared sample cell and an application thereof in a CO2-organic liquid system. The sample cell comprises a stainless steel shell. A through hole is arranged in the shell. Two ends of the through hole are encapsulated by infrared windows. The shell is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are communicated with the through hole. The high pressure in-situ infrared sample cell can be used to research the interaction rules of molecules in a CO2-organic liquid system under a high pressure state. Compared with a molecular dynamic simulation method, the molecular interaction rules of the CO2-organic liquid system under the influence of high pressure can be more vividly represented by the high pressure in-situ infrared spectroscopy. The provided high pressure in-situ infrared sample cell can be used to measure the in-situ infrared spectroscopy of a liquid system, a gas system, and a gas-liquid system under a high pressure condition; the highest pressure can reach 10 MPa, the operation is simple and convenient, the measured data is reliable, and the sample cell can be used to research themicroscopic interaction mechanism of components in a gas system, a liquid system, or a gas-liquid system.

Description

technical field [0001] The invention relates to a high-pressure in-situ infrared sample pool and its CO 2 -Applications in organic liquid systems, belonging to the field of infrared spectroscopy testing. Background technique [0002] With increasing pressure, CO 2 and the volume of the liquid phase part of the organic liquid molecular system becomes larger, CO 2 Solubility increases, and different types of organic liquid molecules have obvious differences in their phase changes, CO 2 The interactions between molecules and organic liquid molecules are also different. During the pressurization process, organic molecules are subjected to CO 2 The impact of the molecule, the infrared absorption spectrum of its functional group and carbon chain will change, similarly, CO 2 Molecules are affected by organic liquid molecules, and their infrared absorption spectrum will also change. Therefore, the microscopic interaction of molecules in the system can be studied by high tempera...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N21/3577
CPCG01N21/3504G01N21/3577
Inventor 杨子浩彭林林梅钦董朝霞张娟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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