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Forward osmosis composite membrane based on large-aperture base membrane, and production method thereof

A large pore size, composite membrane technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of low porosity, poor hydrophilicity, low water flux, etc. The effect of short mass transfer distance and increased water flux

Active Publication Date: 2018-07-20
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the base membranes used for forward osmosis composite membranes mainly use ultrafiltration membranes such as polyethersulfone, polysulfone, and cellulose acetate as porous support layers, which have small pore diameters (below 0.1 micron), low porosity, and relatively hydrophilic properties. Poor, tortuous flow channels, poor physical and chemical stability, etc., so that the internal concentration polarization of the prepared forward osmosis composite membrane is serious, the water flux is low, the pollution resistance is poor, and even the ultra-thin desalination layer is incomplete and easy to fall off, etc. phenomenon, which reduces the efficiency of the forward osmosis process, increases the cost, and is still difficult to meet the requirements of industrial forward osmosis applications

Method used

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  • Forward osmosis composite membrane based on large-aperture base membrane, and production method thereof
  • Forward osmosis composite membrane based on large-aperture base membrane, and production method thereof
  • Forward osmosis composite membrane based on large-aperture base membrane, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.2 μm, a porosity of 89%, and a thickness of 50 μm prepared by a biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 3 seconds. Put the base film in an oven at 80°C, heat treatment and set it for 20 minutes;

[0031] Step 2: Weigh 1g of m-phenylenediamine, 0.05g of sodium lauryl sulfate, and 0.25g of triethylamine, dissolve them in 48.7g of water, make a water phase monomer solution and put it in a water bath at 15°C; weigh 0.1 g of trimesoyl chloride was dissolved in 49.9 g of n-hexane to make an oil phase monomer solution and placed in a water bath at 15°C;

[0032] Step 3: Put the above base film in the interface polymerization mold, add deionized water to the mold to wet the base film, then remove the excess deioniz...

Embodiment 2

[0035] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.45 μm, a porosity of 91%, and a thickness of 40 μm prepared by the biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 2 seconds. Put the base film in an oven at 100°C, heat treatment and set it for 10 minutes;

[0036] Step 2: Weigh 1.2g of m-phenylenediamine, 0.06g of sodium lauryl sulfate, and 0.34g of triethylamine, dissolve them in 48.4g of water, make a water phase monomer solution and put it in a water bath at 11°C; weigh Take 0.15 g of trimesoyl chloride, dissolve it in 49.85 g of n-hexane to make an oil phase monomer solution, and put it in a water bath at 11°C;

[0037] Step 3: Put the above base film in the interface polymerization mold, add deionized water to the mold to wet the base film, then remove the e...

Embodiment 3

[0040] Step 1: The polytetrafluoroethylene microporous membrane with a pore size of 0.65 μm, a porosity of 93%, and a thickness of 30 μm prepared by a biaxial stretching method is prepared by a physical modification method of coating polyvinyl alcohol to prepare a super-hydrophilic large-pore base membrane. The water dynamic contact angle of the film drops to 0 degrees within 2 seconds. Put the base film in an oven at 120°C, heat treatment and set it for 5 minutes;

[0041] Step 2: Weigh 0.75g of m-phenylenediamine and 0.25g of triethylamine, dissolve them in 49g of water, make a water phase monomer solution and put it in a water bath at 20°C; weigh 0.15g of trimesoyl chloride, dissolve in Prepare an oil phase monomer solution in 49.85g of ethylcyclohexane and put it in a water bath at 20°C;

[0042] Step 3: Put the above base film in the interface polymerization mold, add 2% glycerin aqueous solution to the mold to wet the base film, then remove the excess wetting liquid on ...

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Abstract

The invention discloses a forward osmosis composite membrane based on a large-aperture base membrane, and a production method thereof. The forward osmosis composite membrane is formed by the large-aperture base membrane and an ultrathin desalination layer; and a superhydrophilic micro-porous membrane having an aperture of 0.1-1 [mu]m and a porosity reaching up to 85% or more is used as the large-aperture base membrane, the large-aperture base membrane undergoes heat treatment, and then an aqueous solution of a polyamine active monomer and an oil phase solution of an acyl chloride active monomer form the ultrathin desalination polyamide layer on the surface of the base membrane through an interfacial polymerization technology. The production method effectively eliminates the adverse influences of currently adopted small-aperture ultrafiltration membrane structures as the base membrane on the performances of the forward osmosis composite membrane, solves the problem of unstable combination of the ultrathin desalination polyamide layer and the base membrane, greatly improves the intramembrane concentration polarization phenomenon, reduces the mass transfer distance and resistance, improves the water flux, the interception rate and the anti-pollution characteristic of the forward osmosis composite membrane, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer membrane separation, and in particular relates to a forward osmosis composite membrane based on a base membrane with a large pore size and a preparation method thereof. Background technique [0002] Membrane separation technology has been widely used as a new type of high-efficiency separation, concentration, purification and purification technology. Nanofiltration (NF), reverse osmosis (RO) and forward osmosis (FO) are currently developing the most rapidly in the entire market and growing rapidly. Among them, the forward osmosis membrane separation process is driven by the osmotic pressure difference on both sides of the membrane. Compared with the membrane separation process driven by hydraulic pressure difference, the process does not require external pressure, and has low energy consumption, low pollution, easy cleaning and high water recovery. Potential advantages, so it has broad application...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/36B01D69/02B01D67/00B01D61/00
CPCB01D61/002B01D67/0002B01D69/02B01D69/12B01D71/36B01D2325/02Y02A20/131
Inventor 邱慧莹肖通虎李雪燕
Owner NINGBO UNIV
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