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Method for separating C8 aromatic hydrocarbon isomeride mixture

A technology for isomers and C8 aromatic hydrocarbons, which is applied in the field of separation of C8 aromatic hydrocarbon isomer mixtures, can solve the problems of poor molecular recognition ability and low adsorption capacity, and achieves adjustable pore structure and high separation. Selective, adjustable force effects

Active Publication Date: 2020-07-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing MOFs materials have problems such as poor molecular recognition ability and low adsorption capacity for the separation of C8 aromatics, so it is urgent to develop new separation materials and separation methods

Method used

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  • Method for separating C8 aromatic hydrocarbon isomeride mixture
  • Method for separating C8 aromatic hydrocarbon isomeride mixture
  • Method for separating C8 aromatic hydrocarbon isomeride mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 4,4'-bipyridine and dissolve it in ethylene glycol, weigh 0.27g Cu(BF 4 ) 2 ·xH 2 O and 0.20g (NH 4 ) 2 SiF 6 Dissolve in water, mix the above two solutions under stirring, then heat to 60-70°C for 1-12 hours, the obtained product SIFSIX-1-Cu is filtered and washed with methanol, and then vacuum activated at 25-80°C 2 After ~6 hours, the activated SIFSIX-1-Cu material was obtained.

[0052] The adsorption isotherms of p-xylene isomers and ethylbenzene of SIFSIX-1-Cu material at 333K are as follows figure 1 shown.

Embodiment 2

[0054] The SIFSIX-1-Cu prepared in Example 1 is loaded into a 5cm adsorption column, and nitrogen bubbling is used to obtain a mixture containing p-xylene, m-xylene, o-xylene, and ethylbenzene (mass ratio is 1:1:1:1) Then the mixed gas is passed into the adsorption column at a flow rate of 20-40mL / min. The operating temperature of the adsorption column is 60 degrees Celsius. The breakthrough data curve is as follows: figure 2 As shown, high-purity p-xylene gas can be obtained in the effluent gas.

Embodiment 3

[0056] Nitrogen bubbling is used to obtain a three-component mixed gas containing p-xylene, m-xylene, and o-xylene (mass ratio 1:1:1), and then the mixed gas is passed into the embodiment at a flow rate of 20-40mL / min For the adsorption column in 2, the operating temperature of the adsorption column is 60 degrees Celsius, and high-purity p-xylene (greater than 99.9%, mass percent) gas can be obtained in the effluent gas.

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Abstract

The invention discloses a method for separating a C8 aromatic hydrocarbon isomeride mixture, which comprises the following steps of: contacting the C8 aromatic hydrocarbon isomeride mixture with an adsorbent which is an anionic pillared microporous material of which the pore diameter is in the range of 5-10 microns to realize selective adsorption separation of the C8 aromatic hydrocarbon isomeridemixture, wherein the anionic pillared microporous material is a porous material formed by metal ions M, inorganic anions A and organic ligands L through coordination bonds, the general formula of theanionic pillared microporous material is [MAL2]n, and n is larger than 4 and is an integer, the metal ion M is Fe<2+>, Co<2+>, Ni<2+> or Cu<2+>, the inorganic anion A is SiF6<2->, NbOF5<2->, TaF7<2->, ZrF6<2->, TiF6<2->, GeF6<2->, SO3CF3<-> or NbF6<->, and the organic ligand L is selected from the following structure shown in the specification as shown in the description.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for separating a mixture of isomers of C8 aromatic hydrocarbons. Background technique [0002] P-xylene (p-xylene, PX) is a basic organic chemical raw material, mainly used for the synthesis of terephthalic acid (PTA), and PTA is used to produce polyester, especially polyethylene terephthalate (PET ) raw materials. With the surge of global polyester demand, the demand for PX is growing rapidly. In recent years, China has become a major consumer and importer of PX. In 2017, the annual consumption of PX reached 23.85 million tons, with a consumption growth rate of 11.67%, and imports accounted for 60%, mainly from Japan and South Korea. [0003] Mixed C8 aromatics mainly come from steam cracking, catalytic reforming and toluene disproportionation reactions, mainly including xylene isomers (PX, m-xylene (MX), o-xylene (OX)) and ethylbenzene (EB) . Separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/12C07C15/08C07C15/073B01D53/04
CPCC07C7/12B01D53/04C07C15/08C07C15/073Y02P20/50B01D2253/204B01D2257/70B01D53/0423B01D53/02B01J31/181
Inventor 邢华斌崔希利
Owner ZHEJIANG UNIV
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