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Ammonium ion permselective nanofiltration membrane, preparation method, application of ammonium ion permselective nanofiltration membrane in sewage ammonium removal and selective ammonium removal device

A selective, ammonium ion technology, applied in the field of nanofiltration membranes, can solve problems such as low separation efficiency, high performance requirements, and osmotic balance limitations, and achieve the effects of improving efficiency, reducing energy consumption, and saving costs

Inactive Publication Date: 2020-02-21
BEIJING ORIGINWATER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Forward osmosis is used to concentrate ammonium liquid, which requires high performance of membrane materials to intercept ammonium ions. Using concentration difference as the driving force has the problems of low separation efficiency and limited osmotic balance. Further treatment of the drawn liquid is required, relying solely on forward osmosis It is very difficult to achieve selective deammonization by technology

Method used

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  • Ammonium ion permselective nanofiltration membrane, preparation method, application of ammonium ion permselective nanofiltration membrane in sewage ammonium removal and selective ammonium removal device
  • Ammonium ion permselective nanofiltration membrane, preparation method, application of ammonium ion permselective nanofiltration membrane in sewage ammonium removal and selective ammonium removal device
  • Ammonium ion permselective nanofiltration membrane, preparation method, application of ammonium ion permselective nanofiltration membrane in sewage ammonium removal and selective ammonium removal device

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Embodiment 1

[0046] Embodiment 1 of the present invention provides an ammonium ion selectively permeable nanofiltration membrane, comprising a desalination layer, a basement membrane layer, and a support layer arranged in sequence, and the basement membrane layer contains ammonium ion selective recognition receptors; the ammonium ion The ion-selective recognition acceptor is tripyrazole substituted benzene, and its molecular structure formula is as follows:

[0047]

[0048] From the above structural formula, the tripyrazole substituted benzene selectively recognizes ammonium ions based on three imine nitrogen atoms (N2, N4 and N6) and NH 4 + The subtle interaction of the three pyrazole substituted benzene in specific angles and directions with NH 4 + Hydrogen bonding in N R ···N A approx. N R ···N A ···N R The angle is about 110° (where N R Represents the imine nitrogen atom, N A for NH 4 + Nitrogen atom). This interaction on NH 4 + Perfect for (NH 4 + Consists of fou...

Embodiment 2

[0052] Embodiment 2 of the present invention provides an ammonium ion selectively permeable nanofiltration membrane, which is prepared through the following process steps.

[0053] (1) Preparation of 1,3,5-tris(bromomethyl)-2,4,6-triethylbenzene: To 200mL HBr / AcOH (33wt%) paraformaldehyde (33.4g) and 1,3, Add zinc bromide (39.4g) slowly to a mixture of 5-triethylbenzene (20mL), heat the mixture to 90°C in a water bath, and react for 18h to form white crystals. After the reaction, the mixed solution is cooled to room temperature, and the Water was filtered and washed 3-5 times, and finally the washed white crystals were placed in a vacuum oven and dried at 60°C for 48 hours to obtain a white solid which was 1,3,5-tris(bromomethyl)-2,4,6 - Triethylbenzene.

[0054] (2) Preparation of ammonium ion-selective recognition receptors: Add a small amount of 3,5-dimethylpyrazole (2.92 g) to 80 mL of anhydrous tetrahydrofuran (THF) containing NaH (1.24 g) at room temperature, and dissol...

Embodiment 3

[0058] In order to verify the selective permeation effect of ammonium ions through the nanofiltration membrane to the ammonia nitrogen of the water body, the embodiment 3 of the present invention carried out the dynamic circulation deammonization test and the static Deammonization experiment. details as follows:

[0059] Experiment 1: Dynamic cycle deammonization test.

[0060] Such as Figure 5 As shown, the selective dynamic deammonization experiment is carried out by means of cross-flow filtration. The device used is a membrane stage, which consists of two plexiglass plates to form the first support plate 4 and the second support plate 5. There are holes drilled around the support plate. Eight screw holes 6, a rectangular groove 7 of a certain size is left in the middle of the two support plates, the size is 20cm×0.1cm×7cm, and the first support plate 4 is drilled with a water inlet 8 and a water production port 9, which are respectively used for connecting The water inl...

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Abstract

The invention provides an ammonium ion permselective nanofiltration membrane, a preparation method, application of the ammonium ion permselective nanofiltration membrane in sewage ammonium removal anda selective ammonium removal device, and belongs to the technical field of nanofiltration membranes. The ammonium ion permselective nanofiltration membrane comprises a desalination layer, a base membrane layer and a support layer which are sequentially arranged, and the base membrane layer contains an ammonium ion selective recognition receptor; and the ammonium ion selective recognition receptoris tripyrazole substituted benzene. Beneficial minerals such as potassium, calcium, sodium and magnesium in a water body can be intercepted, ammonium ions selectively permeate, and selective permeation, concentration and recovery of the ammonium ions are achieved; and low-pressure driving is adopted, so that the selective separation efficiency is improved, the cost is saved, and the energy consumption is reduced. The technical problem that ammonium ions cannot be selectively separated from potassium, calcium, sodium and magnesium ions through aperture screening of a traditional nanofiltrationmembrane is solved, the problems that a forward osmosis membrane method is low in ammonium removal efficiency, and osmotic balance limitation exists are solved, and the technical problems that a reverse osmosis method is high in cost and large in energy consumption, and beneficial ions such as potassium, calcium, sodium and magnesium ions cannot be reserved are solved.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to an ammonium ion selective permeation membrane capable of realizing the selective permeation concentration recovery of ammonium ions, retaining beneficial minerals, improving separation efficiency, and saving cost and energy consumption. Nanofiltration membrane, preparation method and its application in sewage deammonization, selective deammonization device. Background technique [0002] Ammonia nitrogen (NH 3 -N) is mainly positively charged ammonium ion (NH 4 + ) form exists. For the ammonia nitrogen treatment of the actual municipal water polluted by low concentration ammonia nitrogen, the membrane technologies currently used are forward osmosis (FO) and reverse osmosis (RO). [0003] Reverse osmosis is a desalination method driven by pressure difference. The brine is pressurized, and the reverse osmosis membrane only allows water to pass through, so that f...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D71/06B01D69/10C02F1/44C02F101/16C02F101/38
CPCB01D61/027B01D67/0011B01D67/0013B01D69/105B01D71/06B01D2323/46C02F1/442C02F2101/16C02F2101/38Y02A20/131
Inventor 李锁定刘曼曼莫恒亮俞开昌孟佳意陈亦力薛涛车淑娟袁璐璐
Owner BEIJING ORIGINWATER TECH CO LTD
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