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After-treatment method for increasing flux of ultra-filtration membrane

A technology of ultrafiltration membrane and flux, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of complicated process operation, increase of preparation cost, and difficulty of quality control of casting liquid.

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of the above patents need to add modifying additives to the casting solution, which will easily increase the difficulty of quality control of the casting solution; ultraviolet radiation and surface ionization technology will easily lead to increased production costs and complicated process operations.

Method used

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  • After-treatment method for increasing flux of ultra-filtration membrane
  • After-treatment method for increasing flux of ultra-filtration membrane
  • After-treatment method for increasing flux of ultra-filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0021] In this group of examples, the test performance of the ultrafiltration membrane prepared by post-treatment with different solutions is listed. The volume concentration of the post-treatment solution in the embodiment is 10%, and the preparation method is to measure the selected reagent and place it in a volumetric flask, and then add deionized water to the mark. Specifically, Example 1, Example 2, and Example 3 were prepared from tetrahydrofuran (THF), N,N-dimethylacetamide (DMAc), and N-ethylpyrrolidone (NMP) respectively, with a volume concentration of 10%. solution. The prepared solution was stored at room temperature (22°C).

[0022] Use a polysulfone ultrafiltration membrane with a PEG molecular weight cut-off of 100,000, contact with the prepared solution at room temperature for 60 seconds, rinse in water at 25°C for 10 minutes, and store in deionized water.

[0023] Test the flux of the post-treated ultrafiltration membrane with pure water under a pressure of 0...

Embodiment 4-6

[0035] In this group of examples, the test performances of ultrafiltration membranes prepared by using post-treatment solutions with different THF concentrations are listed. In the examples, the selected experimental steps, methods, and experimental conditions are the same as those described in Examples 1-3.

[0036] The test results are shown in Table 2.

[0037] Table 2

[0038]

[0039] It can be seen from the data in Table 2 that no matter what the concentration of the infiltration solution is, the water flux of the ultrafiltration membrane soaked by the solution increases, and the greater the concentration of the infiltration solution, the greater the increase in the water flux; While the water flux increases, the interception rate remains basically unchanged.

Embodiment 7-9

[0041] In this group of examples, the performance results of the post-treatment of ultrafiltration membranes at different times are listed. In this group of examples, 10% THF aqueous solution was used to treat the ultrafiltration membrane. The selected experimental steps, methods, and experimental conditions are the same as those described in Examples 1-3.

[0042] The test results are shown in Table 3

[0043] table 3

[0044]

[0045] It can be seen from the data in Table 3 that the longer the ultrafiltration membrane is immersed in the solution, the greater the increase in water flux.

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Abstract

The invention discloses an after-treatment method for increasing the flux of an ultra-filtration membrane. The after-treatment method comprises the following steps: after the ultra-filtration membrane is prepared and formed, carrying out solution impregnation on the ultra-filtration membrane, wherein the solution is an aqueous solution of one or more of tetrahydrofuran, N,N-dimethyl formamide, N,N-dimethyl acetamide, N,N-dimethyl acrylamide, N-methyl pyrrolidone, 2-methyl pyrrolidone, dimethyl sulfoxide, tetramethyl sulfoxide, sulfolane, pyridine, methyl pyridine, dimethyl pyridine, dioxane, acetonitrile, hexamethylene amide, morpholine, hydrochloric acid, sulfuric acid, sodium hydroxide and chloroform. The after-treatment method disclosed by the invention has the advantages that the interception rate is maintained, and simultaneously the flux is increased. The after-treatment process is easy to operate and relatively low in increased cost, and conforms to the development direction of high performance and low cost in the membrane industry.

Description

technical field [0001] The invention relates to the field of membrane technology, and more specifically, relates to a post-treatment method for improving flux of an ultrafiltration membrane. Background technique [0002] With the rapid development of my country's industrialization, the situation of water resources is becoming more and more polluted. The scarcity of water resources and the increasingly serious water pollution have become the bottleneck restricting my country's social progress and economic development. Membrane water treatment technology is the solution to resource-based water shortage and water quality As an important technology for water shortage problem, the development of high-performance membrane materials has been highly valued worldwide. At present, the development of global high-performance membrane products presents the following characteristics: the membrane industry is developing in the direction of high performance, low cost and green. [0003] As ...

Claims

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Application Information

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IPC IPC(8): B01D65/00B01D61/20
Inventor 严昊刘轶群潘国元张杨郭敏
Owner CHINA PETROLEUM & CHEM CORP
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