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Preparation method and application of polypropylene hollow fiber hydrophobic membrane

A polypropylene, hydrophobic membrane technology, applied in the field of material science, can solve the problems of low membrane distillation flux and unstable retention rate, and achieve the improvement of membrane distillation flux, gasification efficiency, membrane distillation flux, and pore size distribution. narrow effect

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems of unstable rejection rate and low flux of membrane distillation when the polypropylene hollow fiber hydrophobic membrane prepared by the prior art is applied in the process of external pressure vacuum membrane distillation, the present invention provides a polypropylene hollow fiber hydrophobic membrane Preparation method, and using the membrane for reverse osmosis concentrated water external pressure vacuum membrane distillation process

Method used

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  • Preparation method and application of polypropylene hollow fiber hydrophobic membrane
  • Preparation method and application of polypropylene hollow fiber hydrophobic membrane

Examples

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preparation example 1

[0052] A method for preparing a polypropylene hollow fiber hydrophobic membrane for external pressure vacuum membrane distillation, the specific steps are as follows:

[0053] (1) Add polypropylene resin, diluent and additives in the spinning kettle with stirring device, the mass percentage of polypropylene resin is 18%, and melt index is 2g / 10min, with soybean oil and dibutyl phthalate The mixture of grease is diluent, the mass percentage of dibutyl phthalate in the mixture is 90%, the mass percentage of diluent is 73%, the additive is adipic acid, and the addition amount is 0.1% of the polypropylene resin mass, heated to 175°C, and stirred for 3 hours under the condition of nitrogen flow, stopped the stirring and stood for defoaming for 1 hour to obtain the casting solution;

[0054] (2) Use a metering pump to transport the casting liquid to the spinneret, and introduce soybean oil with a temperature of 60°C as an internal solidification medium into the spinneret to form a h...

preparation example 2

[0066] A method for preparing a polypropylene hollow fiber hydrophobic membrane for external pressure vacuum membrane distillation, the specific steps are as follows:

[0067] (1) Add polypropylene resin, diluent and additives to the spinning kettle with stirring device. The mass percentage of polypropylene resin is 30%, and the melt index is 3.1g / 10min. The mixture of octyl fat is a diluent, the mass percentage of dioctyl phthalate in the mixture is 50%, the mass percentage of diluent is 70%, the additive is WBG, and the addition amount is 0.8% of the polypropylene resin mass, heated to 200 ℃, and stirred for 0.5 hours under the condition of blowing nitrogen, stopped the stirring and left to defoam for 0.5 hours to obtain the casting solution;

[0068] (2) Use a metering pump to transport the casting solution to the spinneret, and introduce dioctyl phthalate at a temperature of 30°C into the spinneret as an internal solidification medium to form a hollow fiber membrane. 180°...

preparation example 3

[0080] A method for preparing a polypropylene hollow fiber hydrophobic membrane for external pressure vacuum membrane distillation, the specific steps are as follows:

[0081] (1) Add polypropylene resin, diluent and additives to the spinning kettle with stirring device, the mass percentage of polypropylene resin is 33%, the melt index is 5g / 10min, dibutyl phthalate is used as diluent Thinner, the mass percentage of diluent is 70%, the additive is benzoic acid, the addition amount is 1% of the weight of polypropylene resin, heated to 180 ℃, and stirred for 1 hour under the condition of nitrogen flow, after stopping the stirring, let it stand for defoaming for 2 hour, obtain casting solution;

[0082] (2) Use a metering pump to transport the casting solution to the spinneret, and introduce a mixture of soybean oil and dibutyl phthalate at a temperature of 90°C into the spinneret as an internal coagulation medium to form a hollow fiber membrane, Wherein the mass percent of soyb...

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Abstract

The invention relates to a preparation method and application of a polypropylene hollow fiber hydrophobic membrane, belonging to the field of material science. The method comprises the following steps: 1) adding a polypropylene resin and a diluter into a spinning kettle, heating to 175-200 DEG C, and stirring for 0.5-3 hours to obtain a film casting solution; 2) delivering the film casting solution to a spinneret while introducing an internal setting medium to form a hollow fiber; 3) curing the hollow fiber membrane by cooling with an external setting medium, and carrying out after-drawing rolling according to the drawing ratio of 5-20; 4) extracting in an extractant; and 5) taking out the extracted membrane, and drying to remove the extractant, thereby obtaining the polypropylene hollow fiber hydrophobic membrane. When being subjected to reverse-osmosis concentrated water treatment by external-pressure vacuum membrane distillation in a petrochemical enterprise, the polypropylene hollow fiber hydrophobic membrane has the advantages of high membrane distillation flux, high desalting rate and high sewage recovery rate, and solves the problem of low membrane distillation flux and the problem in reverse-osmosis concentrated water treatment and reclamation in the polypropylene hollow fiber hydrophobic membrane in the prior art.

Description

technical field [0001] The invention belongs to the field of material science, and relates to a preparation and application method of a polypropylene hollow fiber hydrophobic membrane, and more particularly relates to a preparation and application method of a polypropylene hollow fiber hydrophobic membrane used for external pressure vacuum membrane distillation. Background technique [0002] The high-salt and high-organic waste water of a petrochemical enterprise, the remaining reverse osmosis concentrated water after double-membrane treatment and reuse, the main water quality characteristics are: the temperature of the concentrated water is 55~65℃; the conductivity of the concentrated water is 25000~35000μs / cm, the pH 7~8, chromaticity 20~50 times, TOC 100-200 mg / L, NO 3 - 10000~20000mg / L,SO 4 2- 7000~15000 mg / L, Cl - 300~500 mg / L, total iron content 1~5 mg / L. At present, the concentrated water is directly discharged because no economical and effective method has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/08B01D67/00C02F1/44
Inventor 张新妙奚振宇杨永强
Owner CHINA PETROLEUM & CHEM CORP
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