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Novel method for preparing organic-solvent-resisting polyimide nanofiltration membrane through inorganic salt pore-forming agent

A technology of polyimide and inorganic salt is applied in the field of preparation of polyimide nanofiltration membrane, which can solve the problems of increasing solvent resistance and limited solvent resistance.

Inactive Publication Date: 2013-12-25
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyimide nanofiltration membrane has high chemical stability, its solvent resistance is limited, and it needs to be modified by chemical cross-linking to increase the solvent resistance of the membrane.

Method used

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  • Novel method for preparing organic-solvent-resisting polyimide nanofiltration membrane through inorganic salt pore-forming agent
  • Novel method for preparing organic-solvent-resisting polyimide nanofiltration membrane through inorganic salt pore-forming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 0.5gZrCl 4 Add to a mixed solution of 50ml of solvent N-methylpyrrolidone, 44ml of tetrahydrofuran, 1.5g of PEG200, and 4g of maleic acid, and ultrasonically disperse at room temperature for 10 minutes to obtain a uniformly dispersed solution. 20.5g of polyimide was added to the above solution, electromagnetically stirred for 20h, filtered, degassed, and stood still. Coat the casting liquid uniformly on the polyester non-woven fabric under the conditions of 30℃ and 40% relative humidity, volatilize for 40 seconds, immerse the wet film in an ethanol coagulation bath containing 4wt% hexamethylene diamine for 10 minutes, and then deionize Washed in water 3 times, after soaking in isopropanol for 24h, immersing in n-hexane for 24h, and methyl ethyl ketone / toluene / lubricating oil (mass ratio 2:2:1) for 24h, then put it in the air to dry to obtain the required resistance Solvent nanofiltration membrane. The membrane has a retention rate of 97% for ketone-benzene lubricant...

Embodiment 2

[0024] 1gZrCl 4 Add to a mixed solution of 47ml of solvent N-methylpyrrolidone, 45ml of tetrahydrofuran, 2g of PEG200, and 5g of maleic acid, and ultrasonically disperse at room temperature for 10 minutes to obtain a uniformly dispersed solution. Add 22 g of polyimide to the above solution, ultrasonically disperse for 30 min, filter, degas, and stand still. Coat the casting liquid uniformly on the polyester non-woven fabric under the conditions of 30℃ and 50% relative humidity, volatilize for 50 seconds, immerse the wet film in an ethanol coagulation bath containing 6wt% hexamethylene diamine for 10 minutes, and then deionize Washed in water 3 times, after soaking in isopropanol for 24h, immersing in n-hexane for 24h, and methyl ethyl ketone / toluene / lubricating oil (mass ratio 2:2:1) for 24h, then put it in the air to dry to obtain the required resistance Solvent nanofiltration membrane. The membrane has a retention rate of 95% for ketone-benzene lubricants and a flux of 40.5L...

Embodiment 3

[0026] 1gZrCl 4 Add to the mixed solution of 50ml solvent N-methylpyrrolidone, 44ml tetrahydrofuran, 1gPEG200, 4g maleic acid, and electromagnetically stir for 0.5h at room temperature to obtain a uniformly dispersed solution. 20.5g of polyimide was added to the above solution, electromagnetically stirred for 20h, filtered, degassed, and stood still. Coat the casting liquid uniformly on the polyester non-woven fabric under the conditions of 32℃ and 40% relative humidity, volatilize for 50 seconds, immerse the wet film in an ethanol coagulation bath containing 8wt% APTMDS for 30 minutes, and then use deionized water After cleaning 3 times, after soaking in isopropanol for 24 hours, immersing in n-hexane for 24 hours, and methyl ethyl ketone / toluene / lubricating oil (mass ratio 2:2:1) for 24 hours, then dry in the air to obtain the required solvent resistance Nanofiltration. The rejection rate of the membrane to ketone-benzene lubrication is 99%, and the flux is 44L·m -2 ·H -1 An...

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Abstract

The invention discloses a novel method for preparing and modifying a polyimide nanofiltration membrane used for a benzol-ketone dewaxing lubricating oil solvent organic-solvent-resisting polyimide nanofiltration membrane through an inorganic salt pore-forming agent. Research findings show that if a small amount of inorganic salt ZrCl4 is added to polyimide materials, proper chemical cross-linking modification is conducted on the inorganic salt ZrCl4 and the polyimide materials, and the nanofiltration membrane which is good in solvent resistance performance and has high reject rate and flux to ketone-benzol dewaxing lubricating oil is obtained. Under the operation pressure of 3MPa, the reject rate of the polyimide nanofiltration membrane to the benzol-ketone dewaxing lubricating oil can reach up to 99% and the flux of the polyimide nanofiltration membrane to the benzol-ketone dewaxing lubricating oil can reach up to 44L*m<-2>*h<-1>.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method and application of a polyimide nanofiltration membrane resistant to organic solvents. The prepared nanofiltration membrane is suitable for the recovery of ketone-benzene dewaxing lubricating oil solvents and the recovery of organic solvents in catalyst systems. And other fields. Background technique [0002] As we all know, in order to maintain long-term development, today's society has to face the challenge of transforming traditional industrial growth mode to sustainable growth mode. Solvent dewaxing is an important step in the production process of lubricant base oil. The traditional process generally separates the mixture of lubricating oil and solvent through a distillation process, so as to recover the solvent for recycling. This process not only consumes a lot of energy, but the process is cumbersome and low in efficiency, which limits the producti...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D67/00B01D61/14
Inventor 孙海翔曹敏李鹏王陶史德青侯影飞孔瑛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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