A kind of high throughput and high rejection rate dual-excellent PVDF flat membrane preparation method

A technology with high rejection rate and high flux, which is applied in the field of membrane separation, can solve the problems of low efficiency and achieve the effect of reducing membrane production cost, good application prospects and improving membrane production efficiency

Active Publication Date: 2021-03-30
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Another example is the Chinese patent CN102921317A, which utilizes a common surfactant-organic solvent-water ternary system to prepare a polysulfone ultrafiltration membrane. Although its retention rate to ovalbumin reaches 98.9%, its flux is only 73 L / m 2 h, the efficiency is low in practical applications

Method used

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  • A kind of high throughput and high rejection rate dual-excellent PVDF flat membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1.0 g Lithium chloride (LiCl), 0.5 g of non-ionic fluorocarbon special surfactant (FS-30), 8.0 g of polyvinylidene fluoride were dissolved in 40.5 g of N,N-dimethylacetamide in sequence, heated in a water bath with programmed temperature control (70-80° in the first section 2h, middle section 40-50°3h, final section 70-80°1h) stirring for 6 hours to obtain a uniform casting solution; then at room temperature (18-22°C), ultrasonic (40kHZ) defoaming for 1h, vacuum (negative pressure 0.08 Mpa) for 30 min, and let stand for 6 h. The casting solution was cast on a clean glass plate at room temperature, and a filter membrane with a thickness of 150 μm was scraped with an adjustable scraper; it was dried in air for 30 s; The ratio of 2:8) was used as the non-solvent phase for coagulation bath; pure water was washed and soaked for 24 h to prepare FSS / PVDF flat membrane.

Embodiment 2

[0023] 1.0 g Lithium chloride (LiCl), 1 .5 g of non-ionic fluorocarbon special surfactant (FS-30), 8.0 g of polyvinylidene fluoride were dissolved in 39.5 g of N,N-dimethylacetamide in sequence, heated in a water bath with programmed temperature control (70-80 in the first paragraph °2h, middle section 40-50°3h, final section 70-80°1h) stirring for 6 hours to obtain a uniform casting solution; then at room temperature (18-22°C), ultrasonic (40kHZ) defoaming for 1h, vacuum ( Negative pressure 0.08 Mpa) degassing for 30 minutes, standing still for degassing for 6 hours. The casting solution was cast on a clean glass plate at room temperature, and a filter membrane with a thickness of 150 μm was scraped with an adjustable scraper; it was dried in air for 30 s; The ratio of 2:8) was used as the non-solvent phase for coagulation bath; pure water was washed and soaked for 24 h to prepare FSS / PVDF flat membrane.

Embodiment 3

[0025] 1.0 g Lithium chloride (LiCl), 2 .5 g of non-ionic fluorocarbon special surfactant (FS-30), 8.0 g of polyvinylidene fluoride were dissolved in 38.5 g of N,N-dimethylacetamide in turn, heated in a water bath with programmed temperature control (70-80 in the first paragraph °2h, middle section 40-50°3h, final section 70-80°1h) stirring for 6 hours to obtain a uniform casting solution; then at room temperature (18-22°C), ultrasonic (40kHZ) defoaming for 1h, vacuum ( Negative pressure 0.08 Mpa) degassing for 30 minutes, standing still for degassing for 6 hours. The casting solution was cast on a clean glass plate at room temperature, and a filter membrane with a thickness of 150 μm was scraped with an adjustable scraper; it was dried in air for 30 s; The ratio of 2:8) was used as the non-solvent phase for coagulation bath; pure water was washed and soaked for 24 h to prepare FSS / PVDF flat membrane.

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Abstract

The invention belongs to the technical field of membrane separation and specifically relates to a preparation method of a high-throughput and high-rejection rate double-excellence fluorocarbon specific surfactant blending modified PVDF membrane. The preparation method of a high-throughput and high-rejection rate double-excellence type PVDF flat membrane comprises the following steps: mixing a poreforming agent, a nonionic fluorocarbon specific surfactant, a main membrane material and an organic solvent; heating in water bath and stirring for 6-10h, wherein the pore forming agent, the nonionicfluorocarbon specific surfactant, the main membrane material and the organic solvent account for 1-3%, 1-7%, 12-20% and 70-86% of total mass; pouring a membrane casting solution after ultrasonic-vacuum-standing defoaming onto a glass plate or non-woven fabric in a Z-shaped manner, and scraping to obtain a film with 30-200mum thickness; standing for 15-30s in air; performing coagulating bath by taking emulsified oil / water mixed liquid as a non-solvent phase to obtain a membrane, wherein the membrane is the high-throughput and high-rejection rate double-excellence type PVDF flat membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a fluorocarbon special surfactant blending modified PVDF membrane with double excellent characteristics of high flux and high rejection rate. Background technique [0002] Membrane technology is widely used in many fields, promoting the progress and development of related industries. Membrane modification has always been the basic way and research direction to solve membrane fouling and improve membrane performance. According to the different modification methods, it can be roughly divided into surface modification and blending modification. Among them, blending modification is obtained because of its stability and reliability. favor. For a long time, there have always been some problems in the research of membrane modification, which have seriously hindered the development of membrane science and limited the promotion of membrane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/06B01D69/02B01D67/00
CPCB01D67/0011B01D69/02B01D69/06B01D71/34B01D2325/04
Inventor 刘海龙廖祥军
Owner SHANXI UNIV
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