A method for preparing solvent-resistant organic tubular nanofiltration membranes by bidirectional circulation perfusion

A two-way circulation and nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve enhanced solvent resistance, improved thermal stability, solvent resistance, and good rigidity

Active Publication Date: 2019-09-27
JIANGSU KAIMI MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spiral-wound modules and hollow fiber membrane modules have high requirements on the feed liquid in the application process, and strict pretreatment of the feed liquid is required for membrane separation, while the tubular membrane module has a smooth flow channel and an adjustable feed liquid flow rate Large range, easy to control concentration polarization, especially suitable for membrane separation in non-aqueous systems, currently there is no solvent-resistant organic tubular nanofiltration membrane product in the market

Method used

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  • A method for preparing solvent-resistant organic tubular nanofiltration membranes by bidirectional circulation perfusion
  • A method for preparing solvent-resistant organic tubular nanofiltration membranes by bidirectional circulation perfusion
  • A method for preparing solvent-resistant organic tubular nanofiltration membranes by bidirectional circulation perfusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 15wt% polyacrylonitrile, 10wt% lithium chloride and 75wt% N-methylpyrrolidone were kept and stirred at 30°C at a stirring speed of 100rpm for 12h to obtain the casting solution; Put it together with the non-woven fabric on a tubular film scraping machine and coil the film at 30°C to form a tubular film. The feeding speed is 0.5mL / min, and the coiling speed is 0.5m / min. Place in the air, and after the solvent evaporates, quickly immerse in deionized water at a temperature of 20°C for phase inversion to form a polyacrylonitrile tubular base membrane; prepare the prepared polyacrylonitrile tubular base membrane into a stainless steel supported component.

Embodiment 2

[0040] 17wt% polyacrylonitrile, 6.5wt% lithium chloride and 76.5wt% N,N-dimethylformamide were kept and stirred at 50°C at a stirring speed of 500rpm for 24h to obtain a casting solution; the casting solution was statically After defoaming for 24 hours, place the pretreated non-woven fabric on a tubular film scraping machine at 50°C for film coating, the feeding speed is 4.5mL / min, and the film rolling speed is 4.5m / min. The tubular membrane is placed in the air, and after the solvent is volatilized, it is quickly immersed in a 10wt% ethanol solution at a temperature of 20 ° C to form a polyacrylonitrile tubular base membrane; the prepared polyacrylonitrile tubular base membrane is prepared into a stainless steel supported components.

Embodiment 3

[0042] 30wt% polyacrylonitrile, 1wt% zinc chloride and 69wt% N,N-dimethylacetamide were kept and stirred at 70°C at a stirring speed of 1000rpm for 48h to obtain the casting solution; After soaking for 48 hours, put it together with the pretreated non-woven fabric on a tubular film scraping machine at 70°C to roll the tube to coat the film. The feeding speed is 10ml / min, and the film rolling speed is 10m / min. In the air, after the solvent volatilizes, quickly immerse in a 20wt% isopropanol solution at a temperature of 50 ° C to form a polyacrylonitrile tubular basement membrane; prepare the prepared polyacrylonitrile tubular basement membrane into a stainless steel supported component.

[0043] The basement membrane filtration properties of Example 1 and Comparative Example 1 are shown in Table 1.

[0044] Chemical modification and interfacial polymerization of tubular basement membranes:

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Abstract

The invention discloses a method for preparing a solvent-resistant organic tubular NF (nanofiltration) membrane through bidirectional circulating injection. Polyacrylonitrile is taken as a base membrane material, an aqueous solution and an organic phase solution are sequentially, bidirectionally and circularly injected into a tubular membrane assembly made of the base membrane, the base membrane is subjected to chemical crosslinking modification with hydrazine hydrate, and the compound organic tubular NF membrane is produced through piperazine and trimesoyl chloride interfacial polymerizationon the basis of chemical crosslinking. The produced organic tubular NF membrane comprises four functional layers including an interfacial polymerization layer, a chemical crosslinking layer, a polyacrylonitrile macromolecule layer and a non-woven fabric support layer from inside to outside, can resist multiple organic solvents, has higher membrane flux, has the removal rate of magnesium sulfate larger than 98% and has the pure water flux larger than 40 L / (m<2>.h) under 0.5 MPa. A polyacrylonitrile tubular NF membrane pipe with the diameter in the range of 5-25 mm can be industrially produced,and the membrane pipe has smooth flow paths, wide liquid flow speed adjustment range and easily controllable concentration polarization and is particularly applicable to membrane separation of non-aqueous systems.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a preparation method of a solvent-resistant organic tubular nanofiltration membrane. Background technique [0002] Nanofiltration (NF) is a pressure-driven membrane separation technology between ultrafiltration and reverse osmosis. The pore size of the nanofiltration membrane is 0.5-2nm, the relative molecular weight cut-off is 200-1000Dalton, and the operating pressure is usually 0.35-1.0MPa. The efficiency is lower, so it is especially suitable for separating organic substances with a relative molecular mass of several hundred and divalent and multivalent ions. In recent years, the application of nanofiltration in non-aqueous systems has attracted increasing attention, such as the processing of edible oil, the recovery of extractants, the recovery of solvents after dewaxing petroleum oils, gasoline desulfurization, crude oil deacidification, and pharmaceutical in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D69/12B01D71/42B01D67/00
Inventor 彭娜周龙坤关晓琳尹航曹敏王怀林
Owner JIANGSU KAIMI MEMBRANE TECH
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