A kind of reverse osmosis composite membrane with high desalination rate and preparation method thereof
A reverse osmosis composite membrane and high desalination technology, which is applied in the field of reverse osmosis composite membrane with high desalination rate and its preparation, can solve the problems of reducing the permeation flux of the reverse osmosis composite membrane, and achieve the effect of improving the desalination rate
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Embodiment 1
[0027] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer was immersed in an aqueous solution containing 2 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 80 °C for 5 minutes to obtain the aromatic polyamide reverse osmosis composite membrane.
[0028] Then the aromatic polyamide reverse osmosis composite membrane was soaked in 1% H 2 SO 4 In the aqueous solution, after 5 minutes, add an equal volume of glutaraldehyde aqueous solution with a mass fraction of 1.0%, and a sodium carboxymethylcellulose aqueous solution with a mass fraction of 0.1% for cross-linking and heat treatment at 80°C for 5 minutes to obtain a high desalination rate reverse osmosis composite membrane.
[0029] Under the conditions of NaCl concentration of 1000 mg / l, pressure of 1.0 MPa, temper...
Embodiment 2
[0031] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer was immersed in an aqueous solution containing 2 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 80 °C for 5 minutes to obtain the aromatic polyamide reverse osmosis composite membrane.
[0032] Then the aromatic polyamide reverse osmosis composite membrane was soaked in 1% H 3 PO 4 In the aqueous solution, after 5 minutes, add an equal volume of glutaraldehyde aqueous solution with a mass fraction of 1.0%, and a sodium carboxymethylcellulose aqueous solution with a mass fraction of 0.1% for cross-linking and heat treatment at 80°C for 5 minutes to obtain a high desalination rate reverse osmosis composite membrane.
[0033] Under the conditions of NaCl concentration of 1000 mg / l, pressure of 1.0 MPa, temper...
Embodiment 3
[0035] First, the polysulfone microporous membrane composed of non-woven fabric and polysulfone support layer was immersed in an aqueous solution containing 2 wt% m-phenylenediamine, and the excess solution on the surface was removed with a rubber roller. The organic phase solution of 1 wt% trimesoyl chloride was contacted for 1 minute, and heat-treated in an oven at 80 °C for 5 minutes to obtain the aromatic polyamide reverse osmosis composite membrane.
[0036] Then soak the aromatic polyamide reverse osmosis composite membrane in the citric acid aqueous solution with a mass fraction of 1%, and add an equal volume of glutaraldehyde aqueous solution with a mass fraction of 1.0% and carboxymethyl fiber with a mass fraction of 0.1% after 5 minutes. The aqueous sodium solution is cross-linked and heat-treated at 80° C. for 5 minutes to obtain a reverse osmosis composite membrane with a high desalination rate.
[0037] Under the conditions of NaCl concentration of 1000 mg / l, pres...
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