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Method for preferentially adsorbing and separating ethylbenzene from C8 aromatic hydrocarbon isomeride mixture

A technology of isomers and C8 aromatics, which is applied in the field of preferential adsorption and separation of ethylbenzene, can solve the problems of poor separation ability and low adsorption selectivity, and achieve weak adsorption force, cheap raw materials, and easy desorption cycle Effect

Pending Publication Date: 2022-04-29
ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the existing MOFs materials, there are few ethylbenzene-selective MOFs materials, and there are often problems such as low adsorption selectivity and poor separation ability. It is urgent to develop new separation materials and separation methods.

Method used

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  • Method for preferentially adsorbing and separating ethylbenzene from C8 aromatic hydrocarbon isomeride mixture
  • Method for preferentially adsorbing and separating ethylbenzene from C8 aromatic hydrocarbon isomeride mixture
  • Method for preferentially adsorbing and separating ethylbenzene from C8 aromatic hydrocarbon isomeride mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Weigh 5g Co(NO 3 ) 2 Dissolve in 50ml of N,N-dimethylformamide, then measure 5ml of formic acid into the solution. Stir and heat the above mixture to 100°C for 12 to 24 hours to obtain the product [Co 3 (HCOO) 6 ] was filtered and washed with methanol, and then activated in vacuum at a temperature of 25 to 100°C for 2 to 12 hours to obtain the activated [Co 3 (HCOO) 6 ]Material.

[0044] [Co 3 (HCOO) 6 ] The adsorption isotherms of p-xylene isomers and ethylbenzene at 298K are as follows figure 1 shown.

Embodiment 2

[0046] [Co prepared by embodiment 1 3 (HCOO) 6 ] pack into 5cm adsorption column, adopt nitrogen bubbling mode to obtain the mixed gas containing p-xylene, m-xylene, o-xylene, ethylbenzene (mass ratio is 1:1:1:1), then mixed gas with 10 ~20mL / min flow rate into the adsorption column, the operating temperature of the adsorption column is 25 degrees Celsius, the breakthrough data curve is as follows figure 2 As shown, high-purity o-xylene gas can be obtained in the effluent gas, and high-purity ethylbenzene gas can be obtained after the adsorption column is desorbed at 50-150 degrees Celsius.

Embodiment 3

[0048] Nitrogen bubbling is used to obtain a four-component mixed gas containing p-xylene, m-xylene, o-xylene, and ethylbenzene (mass ratio 1:1:1:1), and then the mixed gas is mixed at 20-40mL / min The flow rate is passed into the adsorption column in Example 2, the operating temperature of the adsorption column is 60 degrees Celsius, and the breakthrough data curve is as follows image 3 As shown, high-purity o-xylene gas can be obtained in the effluent gas, and high-purity ethylbenzene gas can be obtained after the adsorption column is desorbed at 50-150 degrees Celsius.

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Abstract

The invention discloses a method for preferentially adsorbing and separating ethylbenzene from a C8 aromatic hydrocarbon isomeride mixture, which comprises the following steps: by taking a microporous material synthesized from a carboxylic acid ligand and metal ions as an adsorbent, carrying out contact adsorption on the C8 aromatic hydrocarbon isomeride mixture containing ethylbenzene and the adsorbent, selective adsorption separation of ethylbenzene from a C8 aromatic hydrocarbon isomeride mixture is realized; the microporous material synthesized by carboxylic acid ligands and metal ions is a porous material formed by metal ions M and carboxylic acid organic ligands through coordinate bonds, and the general formula is [M3L6] n, 1 is an integer, and L represents HCOO-; the metal ion M is at least one of Co < 2 + >, Ni < 2 + > and Mg < 2 + >; and the carboxylic acid organic ligand is HCOOH.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for preferentially adsorbing and separating ethylbenzene from a mixture of isomers of C8 aromatic hydrocarbons. Background technique [0002] Ethylbenzene (EB) is an important chemical intermediate, mainly used in the preparation of high-purity styrene, which is the main raw material of synthetic rubber. Industrially, ethylbenzene is mainly prepared by the alkylation reaction of benzene and ethylene, and a small amount of ethylbenzene comes from the separation and purification of industrial C8 aromatic mixtures. The mixture of carbon and eight aromatic hydrocarbons is the main raw material for the production of p-xylene (PX), consisting of p-xylene, o-xylene (OX), m-xylene (MX) and ethylbenzene . According to the difference of sources, the composition of the main components of the C8 aromatics mixture is different. In industry, the C8 aromatics mixture mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/073C07C7/12B01D53/04B01D53/047B01J20/22B01J20/30
CPCC07C7/12B01J20/226B01D53/0462B01D53/047C07C15/073
Inventor 崔希利李一健邢华斌陈丽媛
Owner ZHEJIANG UNIV HANGZHOU GLOBAL SCI & TECH INNOVATION CENT
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