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Acyl chloride monomer and preparation method thereof and reverse osmosis composite membrane and preparation method thereof

A monomer and acid chloride technology, applied in the field of reverse osmosis, can solve the problems of reducing membrane desalination rate, shortening membrane service life, and destroying desalination layer

Inactive Publication Date: 2016-05-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It is disclosed in the prior art to add water-soluble monomers such as isopropanol into the aqueous phase solution (such as U.S. patents US4872984, US4983291, US5207908, US6162358, US6024873, Chinese patent CN201410035927.9), or add a small amount of Plasticizer (Chinese patent CN201310065885.9), can improve the permeation flux of reverse osmosis membrane, but can reduce the desalination rate of membrane to a certain extent; .9, CN200610051192.4) can also increase the permeation flux of the membrane to a certain extent, but this post-treatment process is more complicated, and it also causes damage to the desalination layer, resulting in a decrease in the desalination rate of the membrane and making the use of the membrane shortened lifespan
Therefore, in order to maintain a high desalination rate in the existing reverse osmosis composite membrane, the water flux is often lost at the expense of increasing the water flux through post-treatment of the reverse osmosis membrane, which in turn leads to a decrease in the desalination rate. dilemma

Method used

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  • Acyl chloride monomer and preparation method thereof and reverse osmosis composite membrane and preparation method thereof
  • Acyl chloride monomer and preparation method thereof and reverse osmosis composite membrane and preparation method thereof
  • Acyl chloride monomer and preparation method thereof and reverse osmosis composite membrane and preparation method thereof

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preparation example Construction

[0056] The invention provides a kind of preparation method of the acid chloride monomer with formula I structure, comprises the following steps:

[0057] A1) Under the conditions of a protective atmosphere and a metal salt catalyst, the compound having the structure of formula II is mixed with a phosphorus source to react to obtain a compound having the structure of formula III; the source of phosphorus includes dimethyl phosphate, triphosphate One or more of methyl ester, dimethyl phosphite and trimethyl phosphite;

[0058]

[0059] Among them, R 1 `~R 5 `at least any two of -COOCH 3 , and the rest are selected from H;

[0060] A2) After mixing and reacting the compound having the structure of formula III obtained in the above steps with an alkaline solution, and then adjusting to acidic conditions, an intermediate compound is obtained;

[0061] A3) reacting the above-mentioned intermediate compound with an acylating agent to obtain an acid chloride monomer having a st...

Embodiment 1

[0124] Ordinary reverse osmosis composite membrane without new acid chloride monomer

[0125] 165g of polysulfone with a mass concentration of 16.5%, 135g of ethylene glycol monomethyl ether with a mass concentration of 13.5%, and 0.3g of sodium dodecylsulfonate with a mass concentration of 0.03% were dissolved in 699.7g of N,N-dimethyl In formamide, scrape on polyester non-woven fabric, immerse it in deionized water at room temperature for phase inversion, remove good solvent, obtain porous polysulfone support layer with molecular weight cut off (MWCO) of 20000-50000, and then store in in deionized water for later use.

[0126] Pour the mass volume concentration (g / mL) of 3% m-phenylenediamine aqueous solution onto the surface of the polysulfone support layer membrane, the solution covers the surface of the polysulfone support layer membrane for 1 minute, and pour off the excess m-phenylenediamine solution on the membrane surface , dry in the air for 3 minutes, and then the ...

Embodiment 2

[0130] Using a mixture of trimesoyl chloride and monomer 1 (diethyl 3,5-dichloroformylphenylphosphonate), the mass volume concentration (g / mL) of the total aromatic polyacyl chlorides is 0.40%, and its weight ratio For trimesoyl chloride: monomer 1 (diethyl 3,5-dichloroformylphenylphosphonate) is 9:1. All the other conditions are with embodiment 1.

[0131] A performance test was performed on the reverse osmosis composite membrane prepared in Example 2 of the present invention, and the specific results are shown in Table 1.

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Abstract

The present invention provides a novel acyl chloride monomer, which has a -PO (OCH2CH3) 2,-PO (OCH3) 2,-PO (OCH2CH3) Cl,-PO (OCH3) Cl or-PO (Cl) 2 group. The present invention also provides a high-flux reverse osmosis composite membrane which comprises a porous polysulfone support layer and an ultra-thin polyamide active separation layer compounded on the surface of the support layer, the ultra-thin polyamide active separation layer is obtained by interfacial polymerization of an aromatic poly acyl chloride monomer and aromatic polyamine monomer; and the aromatic poly acyl chloride includes the above novel acyl chloride monomer. By introducing of the new acyl chloride monomer, the hydrophily of the surface of the reverse osmosis composite membrane can be increased, and under the premise of no reduction of desalinization rate, the reverse osmosis composite membrane can greatly improve the water flux. The reverse osmosis composite membrane can be widely used in various reverse osmosis systems such as sea water desalination, brackish water desalination, municipal sewage treatment and the like.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis, in particular to an acid chloride monomer and a preparation method thereof, a reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] The phenomenon that a solvent moves from a solution containing a low concentration of solute to another solution containing a high concentration of solute between two mutually isolated solutions through a semipermeable membrane is called osmosis. In this case, the pressure acting on a solution containing a high concentration of solute due to solvent movement is called osmotic pressure. When an external pressure higher than the osmotic pressure level is applied, the solvent may migrate towards a solution containing a low concentration of solute, a phenomenon known as reverse osmosis. The reverse osmosis composite membrane is a semi-permeable membrane that cannot pass through the solute and can only pass through wat...

Claims

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Application Information

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IPC IPC(8): C07F9/40C07F9/42C08G69/32B01D69/12B01D71/56B01D67/00B01D61/02
CPCY02A20/131C07F9/4021B01D61/025B01D67/0006B01D69/12B01D71/56C07F9/42C07F9/425C08G69/32
Inventor 张所波张志广李胜海郑吉富赵亚丽
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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