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Nano-sized high-flux PVDF (polyvinylidene fluoride) plate ultrafiltration membrane as well as screening method and preparation method thereof

A screening method, ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of not being able to significantly improve the actual flux and pore size distribution of the membrane, complex process flow, improper maintenance and management, etc., to achieve optimization Analysis of membrane performance, simplified screening process, and the effect of accurate drug dosage

Inactive Publication Date: 2017-05-10
GO HIGHER ENVIRONMENT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper maintenance and management lead to two common problems: low membrane flux and short membrane life
However, adding a blending modifier will increase the cost of membrane production and complicate the process, and the blending modification of membrane materials cannot significantly improve the actual flux and pore size distribution of the membrane.
However, in the prior art, there is a lack of a suitable flat panel ultrafiltration membrane formula screening method for improving PVDF membrane flux.

Method used

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  • Nano-sized high-flux PVDF (polyvinylidene fluoride) plate ultrafiltration membrane as well as screening method and preparation method thereof
  • Nano-sized high-flux PVDF (polyvinylidene fluoride) plate ultrafiltration membrane as well as screening method and preparation method thereof
  • Nano-sized high-flux PVDF (polyvinylidene fluoride) plate ultrafiltration membrane as well as screening method and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The present embodiment provides a screening method of nano-type high-throughput PVDF flat ultrafiltration membrane, which is carried out in the following steps:

[0048] 1) The influence of variables such as membrane material type, added membrane material concentration, porogen concentration and membrane thickness on membrane performance was investigated by orthogonal experiment method, and the key influencing factors of membrane performance were clarified as follows: membrane material type, dosage Membrane material concentration, porogen concentration and membrane thickness. The design of the orthogonal table header is as follows:

[0049]

[0050] Orthogonal experiment results are as follows:

[0051]

[0052]

[0053] 2) Using the single factor variable method experiment, screening polyvinylidene fluoride membrane materials and porogens from different manufacturers, and determined that the optimal polyvinylidene fluoride membrane material has a weight-avera...

Embodiment 2

[0060] Other conditions are the same as in Example 1, and the weight average molecular weight of the polyvinylidene fluoride membrane material is adjusted to 550,000.

[0061] According to the calculation results, the weight ratio of polyvinylidene fluoride film material, nanometer material, polyvinylpyrrolidone, polyethylene glycol and N-methylpyrrolidone is 12:1:5:3:79. The measured pure water flux of the PVDF flat membrane is 25000LMH, the actual critical flux of the membrane is 56LMH, the membrane contact angle is 70°, and the membrane pore size ranges from 0.57-0.69μm.

Embodiment 3

[0063] The present embodiment provides a method for preparing a nano-type high-flux PVDF flat ultrafiltration membrane, comprising the following steps:

[0064] 1) Divide the solvent into two parts, get 4g nano TiO 2 Dissolve in 94g of N,N-dimethylacetamide (DMAC), and ultrasonically disperse for 1.5h with a digitally controlled ultrasonic disperser with an ultrasonic power of 240W. Then the casting solution is prepared according to the weight ratio of polyvinylidene fluoride: solvent: porogen: nanometer material = 15:75:8:2.

[0065] 2) The porogen is composed of polyvinylpyrrolidone (molecular weight: 40,000) and polyethylene glycol with a weight ratio of 1:1. The porogen is dissolved in the remaining solvent at a dissolution temperature of 70°C and a dissolution time of 30 minutes.

[0066] 3) The ultrasonically dispersed nanomaterials and polyvinylidene fluoride (weight average molecular weight: 1 million) are sequentially dissolved in the remaining solvent and mixed even...

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Abstract

The invention discloses a nano-sized high-flux PVDF (polyvinylidene fluoride) plate ultrafiltration membrane as well as a screening method and a preparation method thereof, and belongs to the technical field of PVDF plate ultrafiltration membranes. The PVDF plate ultrafiltration membrane with high membrane flux is characterized by being prepared from raw materials in parts by weight as follows: 10-25 parts of PVDF, 70-85 parts of a solvent, 5-15 parts of a pore forming agent and 0.5-5 parts of a nanomaterial. According to the plate ultrafiltration membrane with high-flux PVDF membrane flux as well as the screening method and the preparation method thereof, the membrane formula screen method is optimized scientifically, so that the material ratio is optimized, the consumption quantity accuracy of the materials is improved, and a membrane product with high flux, low cost and long service life is prepared.

Description

technical field [0001] The invention belongs to the field of PVDF membrane flat ultrafiltration membranes, and relates to a flat ultrafiltration membrane formula screening process for improving PVDF membrane flux. Background technique [0002] In the field of membrane separation engineering, polyvinylidene fluoride (PVDF) has been widely used as an excellent membrane material. However, due to the natural strong hydrophobicity of polyvinylidene fluoride membranes, the membrane flux is low and the cost of the membrane is high, which limits the further promotion of polyvinylidene fluoride membranes and membrane bioreactors. At present, in the application of flat ultrafiltration membranes in China, the membranes are damaged due to improper use. Membrane cleaning, especially chemical cleaning, has a corrosive effect on the membrane. The performance of the membrane material itself is limited (for example, the service life of PVC material is about 3-5 years, PVDF material is abou...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D63/08B01D71/34B01D67/00
CPCB01D61/145B01D63/08B01D67/0011B01D67/0013B01D71/34B01D2325/02
Inventor 陈福泰张桂英
Owner GO HIGHER ENVIRONMENT GRP CO LTD
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