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Hollow fiber ultrafiltration membrane

An ultrafiltration membrane and fiber technology, applied in the field of ultrafiltration membranes, can solve the problems of wide pore size distribution, many types of pollutants, and difficulty in meeting large-scale engineering applications.

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

[0006] Currently widely used polyolefin ultrafiltration membrane products, the outstanding problems mainly include: (1) Single skin layer, cross-section exhibits finger-like or sponge-like, or finger-sponge-like structure, although it can be used as internal pressure or external pressure respectively However, the ultrafiltration membrane with a single-layer structure in the backwashing process is very likely to cause irreversible pollution during the backwashing process, such as figure 1 and figure 2 (2) Low porosity, wide pore size distribution, and low flux are difficult to meet the requirements of large-scale engineering applications, especially in the wastewater treatment process in the petrochemical field. , and its performance varies greatly. For membrane reuse technology, it is necessary to prepare ultrafiltration membrane products with specific structures according to the characteristics of the main pollutants of wastewater and the water requirements of the target water quality, and at the same time meet the requirements of good selectivity, small membrane pore size and pore size. Ultrafiltration membrane products with relatively narrow distribution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 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.

[0073] 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 triethylene...

Embodiment 2

[0084] 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 it into a 150L casting solution reactor, and when adding materials, stir in the reactor for 20 minutes, then add the next material, heat the temperature of the casting solution reactor to 100°C, and put the above casting solution system in Dissolve for 30 hours at 130 rev / min, and obtain a homogeneous casting solution system after vacuum and static defoaming for 40 hours.

[0085] 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 solution of triethylene glycol ...

Embodiment 3

[0095] 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.

[0096] 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 invention provides a hollow fiber ultrafiltration membrane which comprises an outer skin layer, an inner skin layer, a first inner layer adjacent to the outer skin layer and a second inner layer adjacent to the inner skin layer. The hollow ultrafiltration membrane provided by the invention has the advantages of high membrane strength, small membrane pore size, narrow pore size distribution and high membrane flux. A hollow fiber ultrafiltration membrane product can effectively remove pollutants in wastewater, such as colloid, suspended matters, microorganisms and the like, in an actual sewage deep treatment and reusing process.

Description

technical field [0001] The invention relates to the technical field of ultrafiltration membranes, in particular to 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 environment is deteriorating,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00B01D71/68B01D71/64B01D71/42B01D71/10
Inventor 杨永强栾金义魏昕王玉杰
Owner CHINA PETROLEUM & CHEM CORP
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