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Polyimide nanofiber composite membrane, preparation method and application of polyimide nanofiber composite membrane in organic solvent nanofiltration process

A polyimide and nanofiber technology, applied in the field of separation membranes, can solve problems such as the permeability limitation of asymmetric basement membranes

Active Publication Date: 2021-03-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the tortuous channels of the phase inversion basement membrane limit the permeability of the asymmetric basement membrane fabricated by the NIPS method.

Method used

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  • Polyimide nanofiber composite membrane, preparation method and application of polyimide nanofiber composite membrane in organic solvent nanofiltration process
  • Polyimide nanofiber composite membrane, preparation method and application of polyimide nanofiber composite membrane in organic solvent nanofiltration process
  • Polyimide nanofiber composite membrane, preparation method and application of polyimide nanofiber composite membrane in organic solvent nanofiltration process

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preparation example Construction

[0045] A new technical route for preparing organic solvent-resistant nanofiltration membranes is proposed in the present invention: the insoluble PI nanofibrous base membrane is produced by electrospinning polyamic acid (PAA) followed by thermal imidization, and then adopts hydrophilic A water-based intermediate layer is used to assist in the preparation of a dense selective layer on a hydrophobic base film.

[0046] The resulting thin film nanofiber composite (TFNC) membrane has a rejection rate of 98.4% of Janus Green B (MW: 511.07Da), and a pure THF flux of 4.61Lm -2 h -1 bar -1 , the pure water flux is 22.44Lm -2 h -1 bar -1 . Thin film composite (TFC) membranes have enhanced stability in polar aprotic solvents such as dimethylformamide (DMF), dimethylsulfoxide (DMSO), and tetrahydrofuran (THF), highlighting their use in Potential applications in enhancing polar solvent separations.

Embodiment 1

[0047] The preparation of embodiment 1 insoluble PI nanofiber base film PI nanofiber base film manufacture

[0048] (1) Electrospun nanofibrous membranes from a PAA precursor solution prepared by polycondensation of 4,4'-diaminodiphenyl ether (ODA) and equimolar pyromellitic anhydride (PMDA) in DMF of. A predetermined amount of 4,4'-diaminodiphenyl ether (ODA) and equimolar pyromellitic anhydride (PMDA) were dispersed in DMF in a three-necked flask with a solid content of 20 wt%. The mixture was mechanically stirred at 25°C for 4 hours to obtain a homogeneous PAA solution, and left to stand for 12 hours to eliminate trapped air bubbles in the solution.

[0049] (2) Prepare the nanofibrous membrane by electrospinning the PAA solution: by applying the optimal voltage (19.0kV) and flow rate (1.0mLh -1 ), the width (20.0mm) and the tip-to-collector distance (16.0cm) under the electric field, the PAA solution was electrospun onto the aluminum foil to prepare the PI nanofiber memb...

Embodiment 2PI

[0051] The preparation of embodiment 2PIP-PEI-TFNC film

[0052] First, the surface of the nanofiber base film prepared in Example 1 was exposed to an aqueous solution (2.0% w / w) of polyethyleneimine (PEI, Mw ~ 70k) for 10 minutes, and then mixed with 0.1% w / w Tricarboyl chloride (TMC) / n-hexane was used for crosslinking for 2 minutes, and after forming the PEI crosslinked intermediate layer, the surface of the nanofiber-based membrane was exposed to PIP aqueous solution (1% w / w) for 2 minutes. Excessive PIP solution was removed from the base film using a rubber roller, and then exposed to a hexane solution containing 0.1% w / w TMC for 2 minutes to carry out the cross-linking reaction. The resulting PIP-PEI-TFNC membranes were washed several times with deionized water and finally stored in ethanol at room temperature before being characterized.

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Abstract

The invention relates to a polyimide nanofiber composite membrane, a preparation method and an application of the polyimide nanofiber composite membrane in an organic solvent nanofiltration process, and belongs to the technical field of separation membranes. The invention provides an effective manufacturing technology for producing a nanofiber base membrane based on insoluble polyimide, and provides a method for carrying out one-step post-treatment on a PI nanofiber base membrane through hot pressing. A hydrophilic intermediate layer having a high positive charge density is prepared to promotethe formation of an epidermal layer by interfacial polymerization. The PIP-PEI-TFNC membrane provided by the invention shows good polar solvent permeability and dye rejection rate, shows excellent stability for 48 hours in aprotic transfer solvents (such as DMSO and DMF), and highlights the potential application of the PIP-PEI-TFNC membrane in organic solvent recovery in pharmaceutical and food industries.

Description

technical field [0001] The invention relates to a polyimide nanofiber composite membrane, a preparation method and its application in an organic solvent nanofiltration process, belonging to the technical field of separation membranes. Background technique [0002] Separation of organic solvents is ubiquitous in industrial-scale chemical processes, since most chemical syntheses involve organic solvents, and even solvent-free reactions require large amounts of organic solvents for purification. Compared with traditional energy-intensive liquid separation processes, the organic solvent nanofiltration (OSN) process is an energy-saving process with the potential to improve environmental sustainability in many industrial fields such as food processing, pharmaceuticals, fine chemicals, and petrochemicals. [0003] An ideal OSN membrane should be a thin-layer composite (TFC) structure consisting of a porous base membrane and a thin and highly selective separation layer. At the same...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D69/12B01D67/00B01D61/02B01D69/02
CPCB01D71/64B01D69/12B01D67/0006B01D61/027B01D69/02B01D2323/39B01D2325/36
Inventor 孙世鹏陆天丹赵留林王乾段雷
Owner NANJING UNIV OF TECH
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