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Method for measuring liquid-phase saturation adsorption quantity of short-chain alcohol in microporous molecular sieve and adsorption isotherm

A microporous molecular sieve and short-chain alcohol technology, which is used in measuring devices, material absorption and weighing, material separation, etc., can solve the problems of small pressure range and low accuracy, so as to reduce experimental errors, reduce errors, and improve The effect of accuracy

Inactive Publication Date: 2019-10-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention provides a method for testing the liquid-phase saturated adsorption capacity of novel short-chain alcohols in microporous molecular sieves. The method overcomes the defects of the traditional thermogravimetric analysis method (the pressure range is small, and it is accurate when testing materials with weaker adsorption capacity). low degree), the method of the present invention is accurate in measurement, the pressure range covers a large range, and the accuracy is high, which has certain guiding significance for industrial scale-up, especially adsorption separation and its scale-up process

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  • Method for measuring liquid-phase saturation adsorption quantity of short-chain alcohol in microporous molecular sieve and adsorption isotherm
  • Method for measuring liquid-phase saturation adsorption quantity of short-chain alcohol in microporous molecular sieve and adsorption isotherm
  • Method for measuring liquid-phase saturation adsorption quantity of short-chain alcohol in microporous molecular sieve and adsorption isotherm

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A method for measuring the saturated adsorption capacity of ethylene glycol on granular NaY molecular sieves, comprising the steps:

[0060] (1) Mixed solution preparation: select a component (benzhydryl alcohol) that is inert to NaY molecular sieve and ethylene glycol, and prepare completely miscible ethylene glycol and benzyl alcohol in a mass ratio of 1:1 as much as possible to form a mixed group points, placed as attached figure 1 In the reaction kettle shown, weigh and add the mixed component mass M in the kettle L,0 =40.04g, the complete miscible mixed components are sampled for gas chromatography quantitative analysis, showing that the mass fraction of ethylene glycol x i,0 =50.25%, inert component (benzhydryl alcohol) x inert,0 = 49.75%;

[0061] (2) Sample preparation: accurately weigh the mass M of the granular NaY molecular sieve zeolite =10.00g, close ball valve 2, open ball valve 1, place the weighed molecular sieve between ball valve 1 and ball valve 2...

Embodiment 2

[0065] The difference with Example 1 is that the inert component benzhydryl alcohol is replaced by 1-octanol, and the mixed component mass M is added to the kettle by weighing L,0 =40.02g, the mass fraction of ethylene glycol before the test adsorption x i,0 =50.36%, inert component (1-octanol) x inert,0 =49.64%, mass fraction of ethylene glycol x when testing adsorption equilibrium i,eq =29.85%, inert component (1-octanol) x inert,eq =70.15%, weighing granular NaY molecular sieve quality M zeolite =10.01g, calculate the saturated adsorption capacity of ethylene glycol on the NaY molecular sieve to be Q i = 1.169 g / g.

Embodiment 3

[0067] The difference with Example 1 is that the inert component benzhydryl alcohol is replaced by triethylene glycol, and the mixed component mass M is added to the kettle by weighing L,0 =39.99g, the mass fraction of ethylene glycol before the test adsorption x i,0 =50.08%, inert components (triethylene glycol) x inert,0 =49.92%, mass fraction of ethylene glycol x when testing adsorption equilibrium i,eq =29.34%, inert component (triethylene glycol) x inert,eq =70.66%, weighing granular NaY molecular sieve quality M zeolite =10.03g, calculate the saturated adsorption capacity of ethylene glycol on the NaY molecular sieve to be Q i = 1.170 g / g.

[0068] Examples 1-3 According to the comparative experiments of three different inert components, the saturated adsorption capacity of ethylene glycol on NaY molecular sieves at 60°C and 2.0MPa0+ was measured, and the standard deviation was 0.000959. The saturated adsorption capacity measured in three experiments Basically the s...

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Abstract

The invention relates to a method for measuring liquid-phase saturation adsorption quantity and an adsorption isotherm of short-chain alcohol in a microporous molecular sieve. A liquid inert (no reaction and no adsorption) to short-chain alcohol and the microporous molecular sieve is pre-added in to-be-detected short-chain alcohol, by adoption of an inert component, the experiment error can be effectively reduced, the adsorbed liquid composition is quantitatively analyzed through gas chromatography, and finally the adsorption quantity is obtained through calculation. According to the test method disclosed by the invention, the defects (the pressure range is low, and the accuracy is low when the materials with weak adsorption capacity are tested) of the traditional thermogravimetric analysis method are overcome, the method disclosed by the invention is accurate in determination, large in pressure range coverage and high in accuracy and has certain guiding significance for industrial amplification, particularly for adsorption separation and amplification processes; the method disclosed by the invention can be used for determining the saturation adsorption of short-chain alcohol and can also be used for determining the competitive adsorption quantity of different components in the short-chain alcohol, which is the mixed short-chain alcohol of more than two kinds, and the method iswide in application range.

Description

technical field [0001] The invention belongs to the technical field of material analysis, and in particular relates to a method and an adsorption isotherm for measuring the liquid-phase saturated adsorption capacity of short-chain alcohols in microporous molecular sieves. Background technique [0002] In experimental research, it is often necessary to determine the saturated adsorption capacity and adsorption isotherm of short-chain alcohols in microporous molecular sieves at a certain temperature and pressure, especially in the fixed bed process and simulated moving bed process of liquid-solid adsorption. The saturation adsorption capacity of microporous molecular sieves, and the adsorption isotherms are drawn to investigate the adsorption thermodynamic properties of molecular sieves. [0003] At present, the determination method of liquid-solid phase saturated adsorption capacity is mainly the thermogravimetric method, and the determination method is as follows: under room...

Claims

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Application Information

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IPC IPC(8): G01N5/02G01N30/02G01N30/88
CPCG01N5/02G01N30/02G01N30/88G01N2030/884
Inventor 贺鹏熊佩王利国李会泉曹妍陈家强徐爽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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