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High-performance tubular hybrid membrane as well as preparation method and application thereof in separation of alkane/aromatic hydrocarbon mixture

A high-performance, hybrid membrane technology, applied in the direction of semi-permeable membrane separation, membrane purification/separation, chemical instruments and methods, etc., can solve the problems of no cost-effective separation method, limited feed concentration range, high investment cost, etc. , to achieve the effect of improving selective adsorption capacity, improving separation performance, and improving separation performance

Active Publication Date: 2021-02-26
连云港鹏辰特种新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these traditional separation methods can achieve a certain separation effect, they often have the disadvantages of many equipment, high energy consumption, high investment cost, complicated operation, the need to add auxiliary reagents, and limited feed concentration range.
In addition, due to technical and cost reasons, especially for aromatics / alkane mixtures with aromatics content below 20 wt.%, there is currently no cost-effective separation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 500ml 2mol / L zinc chloride solution and 500ml 1mol / L cobalt nitrate solution dropwise to the DMF solution containing 0.5mol 2-aminoterephthalic acid and mix well, then add silane coupling agent to modify the porous Alumina tubular membrane, the mass ratio of porous alumina tubular membrane to silane coupling agent is 1:0.001; the porous alumina tubular membrane has a pore size of 0.1μm and an area of ​​28cm 2 ;Continue ultrasonic dispersion, and finally put the mixed solution in a hydrothermal kettle, and treat it at a constant temperature of 60°C for 1h, and then at a constant temperature of 85°C for 3h, filter after the reaction, and wash the obtained precipitate to obtain a thickness of 1μm. The first separation Floor;

[0030] (2) Add 3g of dopamine to 50ml of Tris solution with a pH of 8.5 and a concentration of 70mmol / L, then dropwise add 100ml of 10g / L nanocellulose solution and mix the prepared mixture into 1L of 60mmol / L by syringe. Carry out cross-linki...

Embodiment 2

[0034] (1) Add 500ml 2mol / L zinc chloride solution and 500ml 1mol / L cobalt nitrate solution dropwise to the DMF solution containing 0.5mol 2-aminoterephthalic acid and mix well, then add silane coupling agent to modify the porous Alumina tubular membrane, the mass ratio of porous alumina tubular membrane to silane coupling agent is 1:0.002; the porous alumina tubular membrane has a pore size of 0.1μm and an area of ​​28cm 2 Continue to ultrasonically disperse, and finally put the mixed solution in a hydrothermal kettle, and treat it at a constant temperature of 70°C for 2 hours, then at a constant temperature of 100°C for 5 hours, filter after the reaction, and wash the obtained precipitate to obtain a thickness of 2μm. The first separation Floor;

[0035] (2) Add 3g of dopamine to 50ml of Tris solution with a pH of 8.5 and a concentration of 70mmol / L, then dropwise add 100ml of 10g / L nanocellulose solution and mix the prepared mixture into 1L of 60mmol / L by syringe. Carry ou...

Embodiment 3

[0039] (1) Add 500ml 2mol / L zinc chloride solution and 500ml 1mol / L cobalt nitrate solution dropwise to the DMF solution containing 0.5mol 2-aminoterephthalic acid and mix well, then add silane coupling agent to modify the porous Alumina tubular membrane, the mass ratio of porous alumina tubular membrane to silane coupling agent is 1:0.001; the porous alumina tubular membrane has a pore size of 0.1μm and an area of ​​28cm 2 ;Continue ultrasonic dispersion, and finally put the mixed solution in a hydrothermal kettle, and treat it at a constant temperature of 65°C for 1h, and then at a constant temperature of 90°C for 4h, filter after the reaction, and wash the obtained precipitate to obtain a thickness of 1.5μm. separation layer;

[0040] (2) Add 3g of dopamine to 50ml of Tris solution with a pH of 8.5 and a concentration of 70mmol / L, then dropwise add 100ml of 10g / L nanocellulose solution and mix the prepared mixture into 1L of 60mmol / L by syringe. Carry out cross-linking rea...

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Abstract

The invention discloses a high-performance tubular hybrid membrane which comprises a porous alumina tubular membrane, and a first separation layer formed by a Co-doped Zn-based MOF material, a secondseparation layer formed by a polydopamine / nanocellulose gel material and a third separation layer formed by a hydrotalcite-like material which are sequentially arranged on the surface of the porous alumina tubular membrane, and the thicknesses of the first separation layer, the second separation layer and the third separation layer are respectively 1-2<mu>m, 60-100nm and 60-100nm. The tubular membrane is good in mechanical property, good in affinity with aromatic hydrocarbon, large in permeation flux and good in separation performance.

Description

technical field [0001] The invention relates to the technical field of hydrocarbon separation, in particular to a high-performance tubular hybrid membrane, its preparation method and its application in the separation of alkane / aromatic mixtures. Background technique [0002] The separation of aromatics and alkanes is a very important and difficult process in the field of petrochemicals. For example, when benzene is catalytically hydrogenated to prepare cyclohexane, in order to purify the product, unreacted benzene must be removed or recovered when the reactor is discharged, and both benzene and cyclohexane are non-polar six-membered ring compounds with physical and chemical properties Similar to that, it can form a constant boiling system, so it has become one of the typical high-energy separation systems in the petrochemical industry. At present, many important chemical crude products are mixtures of aromatics / alkanes, which also need to be separated and purified to achiev...

Claims

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Application Information

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IPC IPC(8): B01D69/04B01D67/00C07C7/144C07C15/06C07C9/15
CPCB01D67/0006B01D69/04C07C7/144C07C15/06C07C9/15
Inventor 江晓龙谈勇谈俊
Owner 连云港鹏辰特种新材料有限公司
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