Method for measuring adsorption phase density of adsorbate gas on adsorbate

An adsorbate and adsorbent phase technology, applied in the field of shale gas exploration, can solve problems such as the influence of unconsidered pressure

Active Publication Date: 2017-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Its shortcoming is that the density of the adsorption phase is assumed to be a constant value, and the influence of pressure is not considered, which is contrary to the actual situation.

Method used

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  • Method for measuring adsorption phase density of adsorbate gas on adsorbate
  • Method for measuring adsorption phase density of adsorbate gas on adsorbate
  • Method for measuring adsorption phase density of adsorbate gas on adsorbate

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Embodiment Construction

[0031] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0032] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0033] according to figure 2 The flow diagram shown performs the determination of the adsorbed phase density of methane on illite.

[0034] Step 1: Model building

[0035] The adsorption models such as Langmiur and DR are all for the absolute adsorption amount, but the adsorption amount obtained by the isothermal adsorption experiment and molecular simulation means is the excess adsorption amount. Therefore, before using the adsorption model to optimize the excess adsorption capacity, the model must be corrected first.

[0036]From the perspective of intermolecular interaction, the interaction between gas molecules and the surface of the adsorbent decreases as the distance between them increases until it disappears. Accordi...

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Abstract

The invention discloses a method for measuring the adsorption phase density of adsorbate gas on adsorbate. The method includes the steps: 1) measuring the excess adsorption quantity and the body phase density of the adsorbate gas under at least three different types of pressure; 2) acquiring adsorbed phase volume according to a corrected isothermal adsorption model and the excess adsorption quantity and the body phase density measured in the step 1); 3) acquiring the absolute adsorption quantity of the adsorbate gas on the adsorbate according to the corrected isothermal adsorption model and an isothermal adsorption model; 4) acquiring the adsorbed phase density of the adsorbate gas on the adsorbate according to a formula (1), and denoting the adsorbed phase density as rho adsorption phase with the unit g/cm<3>. The method is directly implemented based on original isothermal adsorption test data, simple, practicable and easy to popularize. According to research of adsorption behaviors by molecular simulation, assumed conditions of the method are more reasonable, and reasonableness is obviously superior to that of a traditional optimization scheme.

Description

technical field [0001] The invention relates to a method for measuring the adsorption phase density of adsorbate gas on adsorbate, belonging to the field of shale gas exploration. Background technique [0002] Scholars at home and abroad are studying the adsorption properties of coal-measure mudstone and shale (J.E.Fitzgerald et al, 2005; Katsuyuki Murata et al, 2001; Sommen J et al, 1995; Moffat D H et al, 1955; Thomas Rupple et al, 1974; Yee D et al, 1994; Berhard M.Krooss, 2008, 2010, 2013; Cui Yongjun, 1999, 2003; Zhou Li, 2000, 2001) found that the adsorption phase The existence of volume will reduce the volume of free gas in the sample cell, which will affect the test results of shale adsorption capacity. However, in the "GB / T 19560-2004 Coal High Pressure Isothermal Adsorption Test Method Capacity Method", the existence of the volume of the adsorption phase is ignored, which will inevitably lead to a large deviation in the evaluation of the adsorption capacity. In r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/04
CPCG01N9/04
Inventor 陈国辉卢双舫李进步许晨曦薛海涛王民田善思黄开展
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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