Method for preparing polyethylene glycol composite nanofiltration membrane and its products

A composite nanofiltration membrane and polyethylene glycol technology, which is applied in the field of separation membranes, can solve problems such as polyethylene glycol composite nanofiltration membranes that have not yet been seen, and achieve the effects of safety, environmental protection, low cost, and simple process

Inactive Publication Date: 2007-10-17
TIANJIN MOTIAN MEMBRANE ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although there are many documents on the preparation of separation membranes using polyethylene glycol in the field of separation membranes, within the scope of the applicant's search, no one has studied the method of PEG crosslinking and grafting induced by electron beam irradiation to prepare polyethylene glycol. Literature Report on Diol Composite Nanofiltration Membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] Polyethylene glycol (PEG) composite nanofiltration membrane (abbreviated as nanofiltration membrane) preparation method (hereinafter referred to as preparation method) of the present invention comprises the following processing steps:

[0020] 1. Preparation of PEG coating solution: Dissolve polyethylene glycol in water to make a concentration of 1×10 -4 g / L~3g / L aqueous solution, that is, PEG coating solution. Because polyethylene glycol has excellent hydrophilicity, it is very easy to prepare PEG coating solution. In particular, PEG can be purchased directly in the market, is easy to obtain and cheap, and the preparation process of PEG coating solution is simpler or does not need to be prepared, the cost is very low, and it is convenient for industrial application.

[0021] 2. Preparation of PEG coating film: the polyethylene glycol coating liquid prepared in the first step is evenly coated on the surface of the base film, and after drying at room temperature, the po...

Embodiment 1

[0029] Dissolve PEG in water to make a concentration of 1×10 -4 g / L PEG coating solution; then evenly coat the coating solution on the surface of the polysulfone ultrafiltration membrane, and dry at room temperature to obtain a PEG pre-coating film; then put the PEG pre-coating film into an electron acceleration field for irradiation , the irradiation dose is 5Gry, the irradiation time is 1min, the irradiated membrane is placed at room temperature for 24h, and after the free radicals are fully reacted, the PEG nanofiltration membrane of the present invention is prepared.

[0030] After testing, the cut-off performance of the prepared nanofiltration membrane is: for 1g / L MgSO 4 The interception rate is 50%, and the water permeation flux is 70L / m 2 .h.

Embodiment 2

[0032] Dissolve PEG in water to make a PEG coating solution with a concentration of 0.5g / L; then apply the coating solution evenly on the surface of the polyethersulfone ultrafiltration membrane, and dry it at room temperature to obtain a PEG pre-coating film; then apply The PEG pre-coated film is placed in an electron acceleration field for irradiation, the irradiation dose is 100Gry, and the irradiation time is 4min. The film after irradiation is placed at room temperature for 20h, and after the free radicals are fully reacted, the PEG of the present invention is obtained. PEG nanofiltration membrane. After testing, the cut-off performance of the polyethylene glycol composite nanofiltration membrane prepared by the preparation method of the present invention is: to 1g / LMgSO 4 The interception rate is 60%, and the water permeation flux is 60L / m 2 .h.

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Abstract

The invention relates to a method for preparing polyethylene glycol composite nanofiltration membrane and the product thereof. The preparation method comprises: the preparation of polyethylene glycol coating liquor with a concentration of 1*10-4g / L-3g / L: the prepared polyethylene glycol coating liquor is uniformly coated on the surface of basement membrane to obtain the polyethylene glycol coating membrane after dry in room temperature; the said polyethylene glycol coated membrane is irradiated in the electron accelerator field, and the irradiation dose is 5Gry-1*104Gry; the irradiation time is 1min-10min; the coated membrane irradiated is laid for 12-24h in room temperature to obtain the said polyethylene glycol composite nanofiltration membrane. The polyethylene glycol composite nanofiltration membrane of the invention is prepared by the method mentioned in the invention. The preparation method does not bring in chemical crosslinking agent, and has no remain and pollution of organic liquor, which is beneficial to environmental protection. The component of the method is easy to buy, the cost is low and it is convenient for practical application. The nanofiltration membrane has a good hydrophilicity, separation selectivity and water penetration, and is also organic fouling resistant.

Description

technical field [0001] The invention belongs to the field of separation membranes, and relates to the preparation method technology of a composite nanofiltration membrane, specifically a preparation method of a composite nanofiltration membrane using polyethylene glycol (PEG) as a functional layer preparation material and its products. The International Patent Classification No. For Int.Cl B01D 69 / 12 (2006.01). Background technique [0002] Nanofiltration membrane is a new type of separation membrane developed in recent years. Its separation features are sieving and charge selection, namely: ①The molecular weight cut-off is 200-2000; ②The rejection rate of divalent and high-valent salts is high, while the rejection rate of monovalent salts is low, and the operating pressure of the system (usually 0.4MPa-1.0MPa) is far lower than the reverse osmosis process (operating pressure ≥ 1.5MPa). The unique separation characteristics make nanofiltration membranes a hot spot in curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/72
Inventor 王薇杜启云
Owner TIANJIN MOTIAN MEMBRANE ENG & TECH
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