A preparation method of polyester amide composite nanofiltration membrane with strong chlorine resistance and anti-pollution

A composite nanofiltration membrane and polyester amide technology, applied in the field of membrane separation, can solve the problems of easy pollution and poor chlorine resistance of commercial nanofiltration membranes, and achieve strong anti-pollution ability, strong hydrophilicity and good chlorine resistance. Effect

Active Publication Date: 2019-06-14
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of a novel polyester amide composite nanofiltration membrane with strong chlorine resistance and anti-pollution, which combines the advantages of polyamide nanofiltration membrane and polyester nanofiltration membrane to solve the existing commercial problems. Nanofiltration membranes are prone to fouling and poor chlorine resistance

Method used

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  • A preparation method of polyester amide composite nanofiltration membrane with strong chlorine resistance and anti-pollution
  • A preparation method of polyester amide composite nanofiltration membrane with strong chlorine resistance and anti-pollution
  • A preparation method of polyester amide composite nanofiltration membrane with strong chlorine resistance and anti-pollution

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specific Embodiment approach 1

[0018] Specific embodiment 1: This embodiment provides a method for preparing a polyester amide composite nanofiltration membrane with strong chlorine resistance and pollution resistance. The specific steps are as follows:

[0019] 1. Prepare the aqueous solution: add 2% (w / v) serinol to pure water (the structural formula is as figure 1 As shown), at the same time add 0.2% (w / v) 4-dimethylaminopyridine as a phase transfer and acylation catalyst, stir and dissolve thoroughly, and adjust the pH of the solution to 11.5 with triethylamine;

[0020] 2. Prepare the organic phase solution: use n-hexane as the organic solvent and add 0.1% (w / v) polyacid chloride to the organic solvent;

[0021] 3. With the polyethersulfone porous ultrafiltration membrane as the support layer, first pour the aqueous solution onto the surface of the support layer and soak for 2 minutes, then pour the aqueous solution and remove the excess water on the membrane surface, and then pour the organic solution onto th...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment provides a method for preparing a polyester amide composite nanofiltration membrane with strong chlorine resistance and pollution resistance. The specific steps are as follows:

[0028] 1. To prepare the aqueous solution: add 1% (w / v) serinol to pure water (its structural formula is as figure 1 As shown), at the same time add 0.2% (w / v) 4-dimethylaminopyridine as a phase transfer and acylation catalyst, stir and dissolve thoroughly, and adjust the pH of the solution to 11.5 with triethylamine;

[0029] 2. Prepare the organic phase solution: use n-octane as the organic solvent and add 0.05% (w / v) polyacid chloride to the organic solvent;

[0030] 3. With polysulfone porous ultrafiltration membrane as the support layer, first pour the aqueous solution onto the surface of the support layer and soak for 2 minutes, then pour the aqueous solution and remove excess water on the membrane surface, and then pour the organic phase solution onto the membrane s...

specific Embodiment approach 3

[0033] Specific embodiment 3: This embodiment provides a method for preparing a polyester amide composite nanofiltration membrane with strong chlorine resistance and pollution resistance. The specific steps are as follows:

[0034] 1. Prepare the aqueous solution: add 0.5% (w / v) serinol to pure water (the structural formula is as figure 1 As shown), at the same time add 0.05% (w / v) 4-dimethylaminopyridine as a phase transfer and acylation catalyst, stir and dissolve thoroughly, and adjust the pH of the solution to 11.5 with triethylamine;

[0035] 2. Prepare the organic phase solution: use toluene and cyclohexane as organic solvents, with a volume ratio of 1:1, and add 0.05% (w / v) polyacid chloride to the organic solvent;

[0036] 3. Using polypropylene porous ultrafiltration membrane as the support layer, first pour the aqueous solution onto the surface of the support layer and soak for 4 minutes, then pour the aqueous solution and remove excess water on the membrane surface, and the...

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Abstract

The invention discloses a preparation method for a polyesteramide compound nanofiltration membrane with strong chlorine resistance and pollution resistance. The method comprises the following steps: taking serinol as an aqueous phase reaction monomer; adding 4-dimethyl aminopyridine into the aqueous phase to serve as a phase transfer catalyst and an acylation catalyst; and preparing a novel polyesteramide compound nanofiltration membrane through the interfacial polymerization reaction of serinol and multi-element acyl chloride on a porous support layer. According to the method, the novel polyesteramide compound nanofiltration membrane is obtained through the interfacial polymerization reaction of serinol and multi-element acyl chloride on the porous support layer under the catalytic action of 4-dimethyl aminopyridine. The nanofiltration membrane has the characteristics of excellent chlorine resistance, high hydrophilia, high pollution resistance and high solute holding capacity, and the preparation technique is simple, convenient and mild and is suitable for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a preparation method of a polyester amide composite nanofiltration membrane with strong chlorine resistance and strong anti-pollution ability. Background technique [0002] With economic development, population increase and water pollution intensified, many countries in the world are facing the problem of water shortage. Therefore, when additional clean water resources cannot be replenished, purifying existing water resources is an important measure to deal with the water crisis. Nanofiltration membrane (NF) is a special membrane material between ultrafiltration membrane and reverse osmosis membrane. It can intercept small molecular organic matter, has partial desalination ability, and has the characteristics of high flux and low energy consumption. It has been used in many fields such as water softening, brackish water desalination, advanced sewage treatment, pharmaceutica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D69/10B01D71/56
CPCB01D67/0006B01D69/02B01D69/10B01D69/125B01D71/56
Inventor 于水利张瑞君时文歆
Owner HARBIN INST OF TECH
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