Method for increasing performance of reverse osmosis membrane

A technology of reverse osmosis membrane and performance, which is used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. Permeable membrane operating costs and other issues, to achieve the effect of reducing the frequency of pollution, improving the desalination rate and water flux, and reducing the cost

Inactive Publication Date: 2017-01-25

VONTRON MEMBRANE TECH CO LTD

5 Cites 19 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] However, for the reverse osmosis membrane prepared by the interfacial polymerization method, diamine and other substances are used as the aqueous phase monomer, and acid chloride and the like are used as the organic phase monomer, so that a large amount of functional monomers remain on the surface of the prepared reverse osmosis membrane. As a result, the ability of the reverse osmosis membrane to resist dissolved oxygen and residu...

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Abstract

The invention relates to the technical field of reverse osmosis membrane performance improving, in particular to a method for increasing the performance of a reverse osmosis membrane. The method includes: using a pickling agent to perform acid pickling on the reverse osmosis membrane after interface polymerization is completed, then using a chemical surface treating agent to perform chemical surface treatment, and using a humectant to perform moisturizing treatment on the reverse osmosis membrane. The method has the advantages that the charge density and chemical components of the polyamide desalting layer of the reverse osmosis membrane can be precisely regulated, the desalting rate and water flux of the reverse osmosis membrane are improved at the same time, the hydrophilicity of the reverse osmosis membrane is increased, pollution occurrence frequency is lowered, the cleaning recovery ability of the reverse osmosis membrane during the actual operation of the reverse osmosis membrane is increased, the defect of an imperfect desalting layer network structure caused by the interface polymerization is overcome, the content of residual monomer is reduced, the desalting rate is increased by 0.5%, and the flux is increased by 20-60%.

Application Domain

Reverse osmosis

Technology Topic

Residual monomerHydrophily +6

Examples

Experimental program(3)

Example Embodiment

[0020] Example 1

[0021] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.2wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 4.0wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0022] For the above pickling agent, the mass concentration of acid in the aqueous solution is 6.5%, the rinsing time is 60 minutes, and the pickling agent temperature is 100°C;

[0023] The above-mentioned chemical surface pretreatment is immersion treatment with a chemical surface pretreatment agent, the chemical surface pretreatment agent, in the aqueous solution, the effective ingredient mass concentration is 10%, the treatment time is 60min, and the treatment temperature is 60℃;

[0024] The above-mentioned chemical surface post-treatment is immersion treatment with a chemical surface post-treatment agent, the chemical surface post-treatment agent, in the aqueous solution, the effective component mass concentration is 20%, the treatment time is 60 minutes, and the treatment temperature is 60°C;

[0025] The above moisturizer is rinsed with an aqueous moisturizer solution, the moisturizer, the mass concentration of the active ingredient in the aqueous solution is 50%, the treatment time is 60 minutes, and the treatment temperature is 70°C;

[0026] The pickling agent component is sulfuric acid.

[0027] Chemical surface pretreatment agent, the active ingredient is sodium sulfite.

[0028] Chemical surface treatment agent, the active ingredient is allyl chloroformate.

[0029] Humectant, the active ingredient is polyaspartic acid.

[0030] Control group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.2wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 4.0wt% m-phenylenediamine was used as the water phase. The oil-water phase interface polymerization process is used to prepare the reverse osmosis membrane. After removing the oil phase solvent on the surface of the reverse osmosis membrane, the membrane is rinsed in hot water at 80°C for 10 minutes.

[0031] The desalination rate and flux of the membranes in the control group and the experimental group were tested. The results showed that the desalination rate of the control group was 99.2%, and the desalination rate of the experimental group was 99.7%; the flux of the experimental group was increased by 20% compared to the control group.

Example Embodiment

[0032] Example 2

[0033] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.3wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 6.0wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0034] For the above pickling agent, the mass concentration of the acid in the aqueous solution is 10%, the rinsing time is 30 minutes, and the pickling agent temperature is 10°C;

[0035] The above-mentioned chemical surface pretreatment is immersion treatment with a chemical surface pretreatment agent, the chemical surface pretreatment agent, in the aqueous solution, the effective ingredient mass concentration is 5%, the treatment time is 20 minutes, and the treatment temperature is 5°C;

[0036] The above-mentioned chemical surface post-treatment is immersion treatment with a chemical surface post-treatment agent, the chemical surface post-treatment agent, in the aqueous solution, the active ingredient mass concentration is 10%, the treatment time is 40 minutes, and the treatment temperature is 5°C;

[0037] The above-mentioned humectant is rinsed with an aqueous humectant solution, the humectant, the mass concentration of the active ingredient in the aqueous solution is 30%, the treatment time is 50 minutes, and the treatment temperature is 5°C;

[0038] The components of the pickling agent are a mixture of sulfuric acid and hydrochloric acid in any ratio by mass.

[0039] Chemical surface pretreatment agent, the active ingredient is a mixture of sodium sulfite and sodium thiosulfate in any mass ratio.

[0040] Chemical surface post-treatment agent, the effective ingredients are allyl chloroformate and N-[2-(trimethylsilyl)ethoxycarbonyloxy]succinimide mixed in any mass ratio.

[0041] Humectant, the active ingredient is a mixture of polyaspartic acid and polyacrylic acid in any mass ratio.

[0042] Control group: The porous polysulfone ultrafiltration membrane was used as the supporting layer, the cyclohexane solution containing 0.3wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 6.0wt% m-phenylenediamine was used as the water phase. The oil-water phase interface polymerization process is used to prepare the reverse osmosis membrane. After removing the oil phase solvent on the surface of the reverse osmosis membrane, the membrane is rinsed in hot water at 80°C for 10 minutes.

[0043] The desalination rate and flux of the membranes in the control group and the experimental group were tested. The results showed that the desalination rate of the control group was 99.2%, and the desalination rate of the experimental group was 99.7%; the flux of the experimental group was increased by 60% compared with the control group.

Example Embodiment

[0044] Example 3

[0045] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.25 wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 5.0 wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0046] For the above pickling agent, the mass concentration of the acid in the aqueous solution is 20%, the rinsing time is 60 minutes, and the pickling agent temperature is 10°C;

[0047] The above-mentioned chemical surface pretreatment is immersion treatment with a chemical surface pretreatment agent, the chemical surface pretreatment agent, in the aqueous solution, the effective component mass concentration is 10%, the treatment time is 60min, and the treatment temperature is 5℃;

[0048] The above-mentioned chemical surface post-treatment is immersion treatment with a chemical surface post-treatment agent, the chemical surface post-treatment agent, in the aqueous solution, the active ingredient mass concentration is 20%, the treatment time is 30 minutes, and the treatment temperature is 5°C;

[0049] The above moisturizer is rinsed with an aqueous moisturizer solution, the moisturizer, the mass concentration of the active ingredient in the aqueous solution is 30%, the treatment time is 20 min, and the treatment temperature is 5°C;

[0050] The ingredients of the pickling agent are malic acid, salicylic acid, and sulfinic acid mixed in any mass ratio.

[0051] Chemical surface pretreatment agent, the effective ingredients are sodium sulfite, sodium thiosulfate, ferrous sulfate, ferrous chloride, sodium hypochlorite, and sodium metabisulfite mixed in any mass ratio.

[0052] Chemical surface post-treatment agent, the active ingredients are allyl chloroformate, N-[2-(trimethylsilyl)ethoxycarbonyloxy]succinimide, chloroformate-2,2,2-trichloroethane Ester, 9-fluorenyl methyl chloroformate, fluorene methoxycarbonyl succinimide, benzyl chloroformate, di-tert-butyl dicarbonate, 2-(tert-butoxycarbonyloxyimino)-2-benzeneacetonitrile , Trityl, 2,4-Dimethoxybenzyl, p-methoxybenzyl, benzyl, phthaloyl, p-toluenesulfonyl, trifluoroacetyl, o-nitrobenzenesulfonyl, P-nitrobenzenesulfonyl, sodium hydroxide, potassium hydroxide, ammonium phosphate, sodium phosphate, sodium dihydrogen phosphate, sodium hydrogen phosphate, sodium carbonate, dry succinic acid, salicylic acid and hydrofluoric acid are mixed in any mass ratio.

[0053] Humectant, the active ingredients are polyaspartic acid, polyacrylic acid, polyvinyl alcohol, hyaluronic acid, polyethylene glycol glycerol ether, ethylene glycol monomethyl ether, polyethylene glycol, amino acids, camphorsulfonic acid, propylene glycol, Glycerol, 1,3-butanediol, 1,2-butanediol, hexanediol, 2-methyl-2,4-pentanediol, xylitol, polypropylene glycol, urea, ethylenediamine, Triethylamine, ethylene glycol amine, triethanolamine, allantoin, and sodium pyrrolidone carboxylate are mixed in any mass ratio.

[0054] Control group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.25 wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 5.0 wt% m-phenylenediamine was used as the water phase. The oil-water phase interface polymerization process is used to prepare the reverse osmosis membrane. After removing the oil phase solvent on the surface of the reverse osmosis membrane, the membrane is rinsed in hot water at 80°C for 10 minutes.

[0055] The desalination rate and flux of the membranes in the control group and the experimental group were tested, and the results showed that the desalination rate of the control group was 99.2%, and the desalination rate of the experimental group was 99.7%; the flux of the experimental group was increased by 40% compared to the control group.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve hydrophilicity

Compositions and methods for enhancing transport through mucus

InactiveUS20100215580A1Reduce mucoadhesivenessImprove hydrophilicityBiocidePowder deliveryChemistryRespiratory mucus

Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE

Surface treatment for silicone hydrogel contact lenses comprising hydrophilic polymer chains attached to an intermediate carbon coating

InactiveUS6902812B2Improve hydrophilicityImprove wettabilityOptical articlesPaper/cardboard layered productsCarbon coatingSurface finishing

Owner:BAUSCH & LOMB INC

Method for increasing performance of reverse osmosis membrane

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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