Check patentability & draft patents in minutes with Patsnap Eureka AI!

A kind of preparation method of porous separation membrane

A technology of porous separation membrane and casting liquid, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. Scale production, low cost, and controllable effects

Active Publication Date: 2016-06-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most membrane materials (such as polyvinylidene fluoride, polyether ether ketone, polysulfone, polyacrylonitrile, polyimide), it is relatively easy to prepare microfiltration membranes by immersion precipitation phase inversion, while preparation Nanofiltration and below membranes are more difficult
Because for most membrane materials, increasing the concentration of the casting solution is the only way to reduce the pore size, but when the concentration of the casting solution is too high, its fluidity is too poor and it is difficult to coat and form a film
This limits the preparation of porous membranes of nanometer size and below by the immersion precipitation phase inversion method.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of porous separation membrane
  • A kind of preparation method of porous separation membrane
  • A kind of preparation method of porous separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1.8 grams of polyvinylidene fluoride with a molecular weight of 50,000 was dissolved in a mixed solvent of 5 ml DMAC and 5 ml sulfolane, stirred for 12 hours, and the formed polymer solution was spread on a glass plate to form a liquid film. Volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then the liquid membrane was quickly immersed in 5L of water, and solidified in about 1 minute to form a porous separation membrane. The structure of the membrane is a typical asymmetric porous membrane, which is composed of a dense skin layer and a macroporous support layer. The pore size of the membrane skin is about 8-10nm, the porosity is 70%, and the thickness is 70 microns. The macroporous support layer is 120 microns thick, with an average pore size of 5 microns and a porosity of 80%.

[0029] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt i...

Embodiment 2

[0031] Dissolve 2.1 g of polyacrylonitrile in 3 ml of DMAC and 3 ml of sulfolane, stir for 12 hours, spread the resulting polymer solution on a glass plate to form a liquid film, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then quickly immersed in 5L of water to solidify to form a porous separation membrane. The pore size of the membrane skin is about 40nm, the porosity is 80%, and the thickness is 60 microns.

[0032] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mAcm -2 , the vanadium ion concentration in the electrolyte is 1.50molL -1 , H 2 SO 4 The concentration is 3molL -1 . The assembled flow battery has a current efficiency of 96.1%, a voltage efficiency of 88.2%, and an energ...

Embodiment 3

[0034] Dissolve 2.3 grams of polysulfone and 0.7 grams of sulfonated polyetheretherketone in 10ml of DMAC, stir for 12 hours, spread the formed polymer solution on a glass plate, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours. DMAC. Then quickly immersed in 5L of water, solidified, forming a porous separation membrane. The pore size of the membrane skin is about 30nm, the porosity is 80%, and the thickness is 80 microns.

[0035] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , the current density is 160-40mAcm -2 , the vanadium ion concentration in the electrolyte is 1.50molL -1 , H 2 SO 4 The concentration is 3molL -1 . The current efficiency of the assembled flow battery is as follows image 3 shown.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a class of porous separation membranes suitable for liquid flow energy storage batteries. The invention also relates to a liquid flow energy storage battery comprising the polymer porous separation membrane of the invention, especially an all-vanadium flow energy storage battery. The preparation method of this kind of membrane material is simple, the chemical stability is good, the pore size is well controllable, and it is easy to realize mass production. The prepared membrane material can effectively realize the separation of different ions and maintain the ion selectivity of the membrane. The method improves the concentration range of the casting solution, expands the ability to regulate the membrane structure through the concentration of the casting solution, and is suitable for all applications in which the membrane structure is adjusted through the concentration of the casting solution.

Description

technical field [0001] The invention relates to a preparation method of high-concentration casting liquid and the application of the porous separation membrane prepared by immersion precipitation phase inversion method in liquid flow energy storage battery Background technique [0002] The preparation of porous membranes by immersion precipitation phase inversion technology has important applications in various industrial fields. In the preparation process of porous membranes, the membrane pore size and pore structure have a crucial impact on the performance. There are many ways to control parameters such as pore size and pore structure, including the choice of solvent / non-solvent system, adding pore-forming agents to the casting solution, adding volatile solvents, and adjusting film-forming conditions. Through the regulation of the pore size, the continuous transformation of the membrane pores from the micrometer scale to the nanometer scale and finally to the dense nonporo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/06B01D71/68B01D71/52B01D71/56B01D71/38B01D71/26B01D71/28B01D71/34B01D71/62B01D71/78B01D67/00H01M2/14H01M50/403H01M50/491
CPCY02E60/10
Inventor 张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com