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High-selectivity composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and high-selectivity technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of increasing the cleaning cycle of membrane elements, easily polluting nanofiltration membranes, and reducing the life of membrane elements, etc. problem, to achieve the effect of improving pollution resistance, increasing thickness and prolonging service life

Inactive Publication Date: 2011-01-05
北京时代沃顿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The surface of the nanofiltration membrane prepared by the above method is generally negatively charged, and the removal rate of monovalent ions is not very high, and the nanofiltration membrane with a negative charge on the surface of the membrane is also more likely to be polluted, resulting in a flux in the Rapid attenuation in a short period of time will increase the cleaning cycle of the membrane element, increase the cost, and also reduce the life of the membrane element

Method used

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  • High-selectivity composite nanofiltration membrane and preparation method thereof
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  • High-selectivity composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: prepare composite nanofiltration membrane according to the following steps:

[0034] (1) Preparation of A solution: get 9g anhydrous piperazine and be dissolved in 985g water and be made into the solution that weight concentration is 0.9%, after dissolving completely, then add anhydrous sodium phosphate 3g (weight concentration 0.3%) in this solution 1. Sodium dodecylbenzenesulfonate 3g (weight concentration 0.3%), obtain A solution after stirring and dissolving completely.

[0035] (2) Preparation of solution B: 26.7 g of trimesoyl chloride was dissolved in 973.3 g of ethylcyclohexane to form a solution with a weight concentration of 2.6%, and solution B was obtained after the dissolution was complete.

[0036] (3) Soak the porous support layer in solution A for 20s, drain until there are no obvious drops of water on the surface and back of the membrane; Soak in citric acid solution for 10 minutes, then soak in pure water for 5 minutes, wash off excess aci...

Embodiment 2

[0038] Embodiment 2: prepare composite nanofiltration membrane according to the following steps:

[0039] (1) The preparation of A solution and B solution is the same as in Example 1.

[0040] (2) Preparation of solution C: same as that of solution A.

[0041] (3) Soak the porous support layer in solution A for 20s, drain until there are no obvious drops of water on the surface and back of the membrane; then contact with solution B for 15s, and soak in solution C for 20s after the solvent evaporates to form the second layer of polyamide layer, then soaked in a citric acid solution with a weight concentration of 6% and a temperature of 80°C for 10 minutes, then soaked in pure water for 5 minutes, cleaned the excess acid, and then used 2% triethylamine and 4% camphor sulphur The acid mixed solution was soaked for 5 minutes, and finally kept in an oven at 80° C. for 5 minutes to obtain a composite nanofiltration membrane.

[0042] Take the diaphragm and test it on the diaphragm...

Embodiment 3

[0043] Embodiment 3: prepare composite nanofiltration membrane according to the following steps:

[0044] (1) The preparation of A solution and B solution is the same as in Example 1.

[0045] (2) Preparation of C solution: get 5g m-phenylenediamine and dissolve it in 989g water to form a solution with a weight concentration of 0.5%. After the solution is completely dissolved, add anhydrous sodium phosphate 3g (weight concentration 0.3%) , N-methylpyrrolidone 3g (weight concentration 0.3%), obtain C solution after stirring and dissolving completely.

[0046] (3) Soak the porous support layer in solution A for 20s, drain until there are no obvious drops of water on the surface and back of the membrane; then contact with solution B for 15s, and soak in solution C for 15s after the solvent evaporates to form the second layer of polyamide layer, then soak in citric acid solution with a weight concentration of 6% and a temperature of 80°C for 10 minutes, then soak in pure water fo...

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Abstract

The invention discloses a high-selectivity composite nanofiltration membrane and a preparation method thereof. The high-selectivity composite nanofiltration membrane comprises a nonwoven layer and a polymer porous supporting layer; and the porous supporting layer is provided with one or two polyamide surface layers prepared by reacting polyamine and / or amine polyalcohol with chlorine polyacyl. Compared with the prior art, by forming one or two polyamide surface layers on the porous supporting layer through an interfacial polymerization method, the nanofiltration membrane has increased thickness of a surface layer, has more smooth, hydrolysis-resistant, oxidation-resistant and scratch-resistant surface, and improves pollution resistance; and the surface of the membrane can carry negative or positive charges, so that the composite nanofiltration membrane has a high-selectively functional desalting layer; besides, the method for preparing the composite nanofiltration membrane is simple to operate, high water flux and desalination rate are ensured under low pressure, and the service life of the membrane component is prolonged.

Description

technical field [0001] The invention relates to a composite nanofiltration membrane and a preparation method thereof, in particular to a composite nanofiltration membrane with a highly selective functional desalination layer and an interface polymerization preparation method thereof. Background technique [0002] Separation membrane is a high-efficiency and energy-saving separation material with broad application prospects. Nanofiltration membranes first appeared in the late 1970s and are one of the fastest-growing membrane varieties in the world in recent years, and have become a research hotspot in the field of separation membranes. Nanofiltration membrane is a pressure-driven membrane whose separation performance is between that of reverse osmosis membrane and ultrafiltration membrane. However, the rejection rate of polyvalent salts and small organic molecules with a relative molecular weight above 300 is relatively high. The interception performance of composite nanofi...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68
Inventor 金焱张强陶建徐强强吴宗策
Owner 北京时代沃顿科技有限公司
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