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Hollow fiber composite nanofiltration membrane and preparation method thereof

A fiber composite and nanofiltration membrane technology, which is applied in the field of membrane separation, can solve the problems of being unable to meet the actual application requirements, the variety of composite nanofiltration membranes, and difficult leak detection, etc., to shorten the dry time, improve gloss, and suppress foam the effect produced

Inactive Publication Date: 2019-06-25
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (4) It is easy to detect leaks and repair components by blowing air, but it is not easy to detect leaks with flat membranes and roll membranes
[0012] However, the current commercial production of composite nanofiltration membranes still has problems such as single variety, low performance, and inability to meet the needs of practical applications.

Method used

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  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof
  • Hollow fiber composite nanofiltration membrane and preparation method thereof

Examples

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preparation example Construction

[0063] On the other hand, the embodiment of the present invention also provides a method for preparing emulsified oil for hydraulic supports, the steps of which are as follows:

[0064] In step a, add aloe extract and defoamer to the supporting layer casting solution, control the temperature at 25° C., and stir for 10-50 minutes. The stirring speed is determined according to the following formula (1),

[0065]

[0066] In the formula, v represents the stirring speed of step a, T 1 Indicates the temperature of the mixed liquid in step a, that is, 25°C; g 1 Indicates the quality of the aloe extract added in step a, g 2 Indicates the mass of defoamer added in step a, G 10 Represent the total mass of the mixed solution in step a; v 0 Indicates the preset stirring speed in step a, which is 150r / min.

[0067] Step b, adding the mixed solution in step a to the spinneret, directly extruding into the coagulation bath in a fine flow state to prepare the supporting layer of the ho...

Embodiment 1

[0077] In the hollow fiber composite nanofiltration membrane described in this embodiment, the preparation material of the support layer includes the following components in parts by weight: 30 parts of support layer casting solution, 8 parts of aloe extract, 3 parts of defoamer; The preparation material of the layer includes the following components in parts by weight: 80 parts of separation layer casting solution, 15 parts of nano-chitin, 15 parts of ultrafine aluminum silicate powder, 5 parts of dispersant, and 300 parts of organic solvent.

Embodiment 2

[0079] In the hollow fiber composite nanofiltration membrane described in this embodiment, the preparation material of the support layer includes the following components in parts by weight: 33 parts of support layer casting solution, 9 parts of aloe extract, 4 parts of defoamer; The preparation material of the layer includes the following components in parts by weight: 100 parts of separation layer casting solution, 19 parts of nano-chitin, 20 parts of ultrafine aluminum silicate powder, 6 parts of dispersant, and 330 parts of organic solvent.

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Abstract

The invention provides a hollow fiber composite nanofiltration membrane and a preparation method thereof. The hollow fiber composite nanofiltration membrane comprises a support layer and a separationlayer, and materials for preparing the support layer comprise, by weight, 30-50 parts of a support layer membrane casting solution, 8-15 parts of aloe extract and 3-6 parts of an antifoaming agent; and materials for preparing the separation layer include, by weight, 80-200 parts of a separation layer membrane casting solution, 15-25 parts of nano-chitin, 15-25 parts of ultrafine aluminum silicatepowder, 5-10 parts of a dispersant and 300-500 parts of an organic solvent. The hollow fiber composite nanofiltration membrane has the advantages of good thermal stability, high mechanical strength, good acid and alkali corrosion resistance, good water throughout and high salt rejection rate.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane (Nanofiltration Membranes) is a new type of separation membrane that came out in the late 1980s. Its molecular weight cut-off is between reverse osmosis membranes and ultrafiltration membranes, about 200-2000. It is speculated that nanofiltration membranes may have a diameter of about 1nm. The microporous structure is called "nanofiltration". Most nanofiltration membranes are composite membranes, and the surface and separation layer are composed of polyelectrolytes, so they have a certain rejection rate for inorganic salts. Most of the nanofiltration membranes that have been commercialized in foreign countries are composed of an ultra-thin separation layer with nano-scale pore size on the microporous base membrane through interfacial polycond...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D69/08B01D69/12B01D67/00
Inventor 曾凡付许白羽
Owner XINJIANG DELAND
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