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Method for preparing reverse osmosis membrane by utilizing ethyl silicate as oil-phase cosolvent

A technology of ethyl silicate and reverse osmosis membrane, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as unsafe, strong pungent odor, and volatile ethyl acetate, and achieve the process Simple, easy-to-implement, low-cost effects

Inactive Publication Date: 2019-07-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ethyl acetate is volatile and has a strong pungent smell, making it unsafe
In addition, the flux of the reverse osmosis membrane prepared by ethyl acetate is not high enough (less than 3L m -2 h -1 · bar -1 )

Method used

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  • Method for preparing reverse osmosis membrane by utilizing ethyl silicate as oil-phase cosolvent
  • Method for preparing reverse osmosis membrane by utilizing ethyl silicate as oil-phase cosolvent
  • Method for preparing reverse osmosis membrane by utilizing ethyl silicate as oil-phase cosolvent

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Immerse the surface of the support membrane in the aqueous phase solution for 20 s so that the support membrane is fully infiltrated by the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the membrane surface, the membrane surface was immersed in a solution containing 0.04% benzoyl chloride, 2% ethyl silicate and 97.96% Isopar G to initiate interfacial polymerization. Finally, the membrane was heat-treated at 70° C. for 4 minutes to prepare an aromatic polyamide composite reverse osmosis membrane, which was fully cleaned with deionized water.

[0022] Filtration of 2000ppm sodium chloride aqueous solution at 15.5bar and 25°C shows that the flux and rejection rate of the composite reverse osmosis membrane are respectively 2.45L m -2 h -1 · bar -1 and 99.25%.

Embodiment 2

[0024] Immerse the surface of the support membrane in the aqueous phase solution for 30s so that the support membrane is fully infiltrated by the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the membrane surface, the membrane surface was immersed in a solution containing 0.12% benzoyl chloride, 8% ethyl silicate and 91.88% Isopar G to initiate interfacial polymerization. Finally, the membrane was heat-treated at 80° C. for 5 minutes to prepare an aromatic polyamide composite reverse osmosis membrane, which was fully cleaned with deionized water. The atomic force microscope image of the aromatic polyamide composite reverse osmosis membrane prepared in this embodiment shows that the surface of the prepared reverse osmosis membrane is rough, and the roughness is as high as 104.9nm (attached figure 1 ); the prepared aromatic polyamide composite reverse osmosis membrane transmission electron microscope ...

Embodiment 3

[0027] The surface of the support membrane was soaked in the aqueous phase solution for 40s so that the support membrane was fully infiltrated by the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the membrane surface, the membrane surface was soaked in a solution containing 0.20% benzoyl chloride, 14% ethyl silicate and 85.80% Isopar G to initiate interfacial polymerization. Finally, the membrane was heat-treated at 90° C. for 6 minutes to prepare an aromatic polyamide composite reverse osmosis membrane, which was fully cleaned with deionized water.

[0028] Filtration of 2000ppm sodium chloride aqueous solution at 15.5bar and 25°C shows that the flux and rejection rate of the composite reverse osmosis membrane are respectively 2.84L m -2 h -1 · bar -1 and 97.94%.

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Abstract

The invention relates to a method for preparing a reverse osmosis membrane by utilizing ethyl silicate as an oil-phase cosolvent. The method comprises the following steps: infiltrating a supporting film into a water-phase solution to sufficiently infiltrate the supporting film by the water-phase solution; infiltrating the film into an Isopar G solution containing the ethyl silicate and trimesoyl chloride to initiate interfacial polymerization to form an aromatic polyamide separation layer; and performing thermal treatment on the film at 70-90 DEG C to obtain the aromatic polyamide composite reverse osmosis membrane. The method provided by the invention has a simple preparation process and low costs, and is easy to implement, and the prepared aromatic polyamide composite reverse osmosis membrane has high flux of >=3L*m<-2>*h<-1>*bar<-1> and a high rejection rate of >=99.00%; and in addition, the method can also provide reference for preparation of other high-performance aromatic polyamide composite separation membranes.

Description

technical field [0001] The invention relates to a method for preparing a reverse osmosis membrane by using ethyl silicate as an oil phase co-solvent, and belongs to the field of composite reverse osmosis membrane preparation. Background technique [0002] Reverse osmosis membrane technology is widely used in the fields of seawater / brackish water desalination, ultrapure water preparation, and wastewater treatment, and is an important means to alleviate the water resource crisis. Preparation with high throughput (≥3L·m -2 h -1 · bar -1 ) and high rejection (≥99.00%) reverse osmosis membranes help to greatly reduce the energy consumption and cost of the reverse osmosis membrane process and improve the water quality (D.Cohen-Tanugi, R.K.McGovern, S.H.Dave, J.H.Lienhard, J.C.Grossman, Quantifying the potential of ultra-permeable membranes for water desalination, Energy & Environmental Science, 2014, 7: 1134-1141.). [0003] Aromatic polyamide thin-layer composite reverse osmo...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/56
CPCB01D67/0006B01D69/125B01D71/56
Inventor 王志严文韬赵颂王纪孝
Owner TIANJIN UNIV
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