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Hollow fiber ultra-filtration membrane preparation method

A technology of ultrafiltration membrane and fiber, applied in the field of ultrafiltration membrane, can solve the problems of consumption, high filtration resistance of ultrafiltration membrane, multi-kinetic energy, etc., and achieve the effect of high membrane flux, small membrane pore size, and high membrane strength

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultrafiltration membrane prepared by this method usually has a relatively dense skin structure, which leads to a large filtration resistance of the ultrafiltration membrane itself, and requires a lot of kinetic energy in actual industrial applications.

Method used

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  • Hollow fiber ultra-filtration membrane preparation method
  • Hollow fiber ultra-filtration membrane preparation method
  • Hollow fiber ultra-filtration membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of casting solution: Weigh 70kg of dimethylacetamide (DMAc), 1kg of anhydrous lithium chloride, 5kg of polyethylene glycol (PEG600), 10kg of polyvinylpyrrolidone (K90), and 14kg of PVDF, and add them to 150L In the casting solution reaction kettle, and after adding materials, stir in the reaction kettle for 20 minutes, then add the next material, heat the casting solution reactor temperature to 95 ° C, and put the above casting solution system at 130 rpm Dissolve for 25 hours under separate conditions, and obtain a homogeneous casting solution system after vacuum and static defoaming for 36 hours.

[0057] The preparation of gelling agent in the gel bath: triethylene glycol, diethylene glycol are fully dissolved in deionized water, obtain the gelling agent of triethylene glycol concentration 28wt% and diethylene glycol concentration 12wt%, and the condensate of this composition The glue is used as the first gel bath, and the temperature of the first gel bath...

Embodiment 2

[0068] Preparation of casting solution Weigh 66kg of dimethylacetamide (DMAc), 2kg of anhydrous aluminum trichloride, 10kg of polyethylene glycol (PEG400), 8kg of polyvinylpyrrolidone (K30), 14kg of PES polymer, and add Into the 150L casting liquid reaction kettle, and after adding materials, stir in the reaction kettle for 20 minutes, then add the next substance, and add the next substance after fully stirring in the reaction kettle for 20 minutes, and react the casting solution The temperature of the kettle was heated to 100°C, and the above-mentioned casting solution system was dissolved at 130 rpm for 30 hours, and a homogeneous casting solution system was obtained after vacuum and static defoaming for 40 hours.

[0069] Preparation of the gelling agent in the gel bath: triethylene glycol and diethylene glycol are fully dissolved in deionized water to obtain a gelling agent with a triethylene glycol concentration of 28wt% and a diethylene glycol concentration of 12wt%. age...

Embodiment 3

[0079] Preparation of casting solution: Weigh 56kg of nitrogen-methylpyrrolidone (NMP), 2kg of anhydrous aluminum trichloride, 8kg of polyethylene glycol (PEG600), 6kg of polyvinylpyrrolidone (K90), 18kg of PVDF polymer, and add in sequence Into the 150L casting solution reactor, and when adding materials, stir in the reactor for 20 minutes, then add the next material, heat the casting solution reactor temperature to 110°C, and put the above casting solution system at 130 Dissolve for 34 hours under the condition of rpm, and obtain a uniform casting solution system after vacuum and static defoaming for 42 hours.

[0080] Preparation of the gelling agent in the gel bath: triethylene glycol and diethylene glycol are fully dissolved in deionized water to obtain a gelling agent with a triethylene glycol concentration of 28wt% and a diethylene glycol concentration of 12wt%. agent as the first gel bath, and the temperature of the first gel bath is raised to 95°C; the aqueous solutio...

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Abstract

The present invention provides a hollow fiber ultra-filtration membrane preparation method, which comprises: preparing a membrane casting liquid, wherein the membrane casting liquid comprises a polymer, a pore forming agent, and a solvent; preparing a first gel bath, a second gel bath and a third gel bath, wherein the first gel bath comprises triethylene glycol and diethylene glycol, the second gel bath comprises glycerol or triethylene glycol, and the third gel bath is water; preparing a core liquid; extruding the membrane casting liquid and the core liquid through a spinning device to obtain hollow fibers having a nascent state; and sequentially immersing the hollow fibers having the nascent state in the first gel bath, the second gel bath and the third gel bath to obtain the hollow fiber ultra-filtration membrane. With the preparation method of the present invention, the hollow fiber ultra-filtration membrane with characteristics of compact inner surface, compact outer surface and topological structure cross section from the skin layer to the cross section can be obtained, and further has characteristics of high membrane strength, small membrane pore size, narrow pore size distribution, and high membrane flux.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to a method for preparing a hollow fiber ultrafiltration membrane. Background technique [0002] Compared with traditional separation, purification and filtration technologies, membrane separation technology has a series of advantages such as high separation efficiency, energy saving, convenient operation and environmental friendliness, and has been widely valued by countries all over the world. Research on microfiltration and ultrafiltration membranes began in foreign countries at the beginning of the 20th century. In the 1960s, following the early development of cellulose acetate membranes, many new varieties were developed, such as polysulfone, polyester, poly Aramid, polytetrafluoroethylene, etc., the market sales of separation membranes in the world reach tens of billions of dollars. Today, when energy is tight, resources are scarce, and the ecological enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 杨永强奚振宇杨丽张新妙
Owner CHINA PETROLEUM & CHEM CORP
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