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A high-efficiency antiscaling and dispersing agent for reverse osmosis membrane

A scale inhibitor and dispersant, reverse osmosis membrane technology, used in semi-permeable membrane separation, membrane technology, scale removal and water softening, etc. Improves water solubility, weakens bridging, and inhibits homogeneous nucleation

Active Publication Date: 2021-09-28
山东科奥环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the membrane treatment process, due to the continuous concentration of raw water, deposits such as metal oxides, silicic acid compounds, and organic matter are easily formed on the membrane surface, which affects the normal operation of the membrane device, resulting in fouling of particles, colloids, and insoluble salts. This situation will not only seriously affect the water production of the membrane, reduce the desalination rate, but also reduce the life of the membrane

Method used

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  • A high-efficiency antiscaling and dispersing agent for reverse osmosis membrane
  • A high-efficiency antiscaling and dispersing agent for reverse osmosis membrane
  • A high-efficiency antiscaling and dispersing agent for reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of antimicrobial components:

[0030] Step S11, mix potassium hydroxide and deionized water, then add dropwise an aqueous solution of 1,2-benzisothiazol-3-one, and dropwise add an aqueous solution of chloroacetic acid at a temperature of 0° C. The temperature was raised to 90°C, and the reaction was stirred for 4 hours. After the reaction, the temperature of the reaction solution was lowered to room temperature, concentrated under reduced pressure to remove the solvent, and then dried to constant weight at 40°C under vacuum to obtain Intermediate 1;

[0031] Step S12, mixing intermediate 1, N,N-dimethylformamide and 2-chloro-4-nitroaniline, adding 1-hydroxybenzotriazole and 1-ethyl-3(3 -Dimethylpropylamine) carbodiimide, stirred and reacted at room temperature for 20h, after the reaction was over, mixed the obtained reaction solution with deionized water, then filtered under reduced pressure, the filter cake was washed with deionized water, and the washing w...

Embodiment 2

[0035] Preparation of antiscalant components:

[0036] Step A11, mix acrylic acid and deionized water, then add aqueous sodium hydroxide solution, adjust the pH value to 6 to obtain a mixed solution, mix the obtained mixed solution with chitosan, and stir and react for 5 hours at a temperature of 90°C , after the reaction, adjust the pH value to 10 with sodium hydroxide, then centrifuge, retain the supernatant, add 2 times the volume of ethanol solution with a volume fraction of 95% to the supernatant, vacuum suction filtration, filter cake with washing with absolute ethanol, and drying to constant weight under vacuum at 70°C after washing to obtain intermediate a;

[0037] Step A12, mix the intermediate a and methanol, then add the antibacterial component, stir and react at 25°C for 72h, after the reaction, filter the obtained reaction solution under reduced pressure, and then dry at 40°C to constant weight , to obtain intermediate b;

[0038] Step A13, mix intermediate b, ...

Embodiment 3

[0041] Preparation of antiscalant dispersant:

[0042] The first step is to mix acrylic acid and deionized water, then adjust the pH value to 7 with a 20% aqueous sodium hydroxide solution by mass fraction, and then add allyl sodium sulfonate to obtain a mixed monomer solution;

[0043] The second step is to mix the anti-scaling component and deionized water, and stir for 1 hour under nitrogen protection at a temperature of 65°C, then add ammonium persulfate at a temperature of 55°C, and then add the mixed monomer solution dropwise , after the dropwise addition, continue to stir the reaction for 3h. After the reaction, the obtained reaction solution is precipitated with acetone, filtered with suction, and the filter cake is washed with absolute ethanol. After the washing is completed, it is dried to a constant weight under vacuum at 60°C. A high-efficiency scale-inhibiting dispersant for reverse osmosis membranes is obtained.

[0044] Among them, the amount ratio of acrylic a...

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Abstract

The invention discloses a high-efficiency scale-inhibiting dispersant for reverse osmosis membranes, which belongs to the technical field of water treatment chemicals. The scale-inhibiting dispersant includes the following raw materials: scale-inhibiting components, acrylic acid and sodium allyl sulfonate; The scale dispersant is prepared through the following steps: the first step, mixing acrylic acid and deionized water, adjusting the pH value to 7, then adding allyl sodium sulfonate to obtain a mixed monomer solution; the second step, mixing the scale inhibitor Mix with deionized water, stir for 1 hour, then add ammonium persulfate at a temperature of 55-60°C, and then add the mixed monomer solution dropwise. After the dropwise addition, continue to react for 3 hours. In the present invention, the antiscalant component, acrylic acid and sodium allyl sulfonate undergo graft copolymerization, wherein the carboxyl group inhibits the stabilization of nucleation ion clusters and the aggregation of crystal nuclei, and the sulfonic acid group can weaken the bridging effect of calcium ions. By introducing an antibacterial component into the antiscaling component, the antibacterial effect is improved and the antiscaling efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of water treatment chemicals, in particular to a high-efficiency scale-inhibiting dispersant for reverse osmosis membranes. Background technique [0002] Reverse osmosis is a membrane separation technology. In the practical application of reverse osmosis membrane separation technology, membrane fouling is a decisive factor affecting the reliability of the technology. The reverse osmosis membrane is the core component of the desalinated water system. During the membrane filtration process, the particles, colloidal particles or solute macromolecules in the water are adsorbed, deposited, and formed on the surface of the membrane or in the pores of the membrane due to physical, chemical or mechanical effects. The pore size becomes smaller or clogged, which reduces the performance of the membrane. Fouling of reverse osmosis membranes can generally be divided into suspended matter or colloidal fouling, inorganic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/06C08F228/02C08F251/00C08F8/18C08F8/34B01D65/08C02F5/12
CPCB01D65/08B01D2321/168C02F5/12C08F8/18C08F251/00C08F285/00C08F220/06C08F8/34C08F228/02
Inventor 刘新明
Owner 山东科奥环境科技有限公司
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