In situ preparation method of a highly selective forward osmosis polyamide composite membrane
A high-selectivity, in-situ preparation technology, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of decreased pollutant removal rate, increased operating costs, and reduced water flux, etc., to achieve good The effect of market promotion prospects, increased selectivity, and convenient operation
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specific Embodiment approach 1
[0013] Specific implementation mode 1: This implementation mode is an in-situ preparation method of a highly selective forward osmosis polyamide composite membrane, specifically according to the following steps:
[0014] 1. Preparation of support layer: Mix the film-forming polymer with a solvent, stir for 8h-24h under sealed conditions, and naturally place defoaming for 16h-24h under non-sealed conditions to obtain the polymer casting solution, and then pass it through a non-solvent The polymer casting liquid is prepared into a support layer by a phase inversion method; the support layer is a support layer in the form of a flat membrane or a support layer in the form of a hollow fiber membrane;
[0015] 2. Preparation of the active layer: put the dense side of the support layer prepared in step 1 into the aqueous solution of polyamine and soak for 0.1-5min. After taking it out, use an air knife to blow off the excess solution droplets on the surface, and then put the dense sid...
specific Embodiment approach 2
[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the film-forming polymer described in step 1 is polysulfone, polyethersulfone, polyvinylidene fluoride, cellulose acetate and cellulose triacetate. One or more mixtures; the solvent described in step one is dimethylacetamide, N-methylpyrrolidone, dimethylformamide, dimethyl sulfoxide, 1,4-dioxane and acetone One or more mixtures; the mass fraction of the film-forming polymer in the polymer casting solution described in step one is 7% to 20%. Others are the same as the first embodiment.
specific Embodiment approach 3
[0021] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the specific preparation method of the support layer in the form of a flat film described in step 1 is as follows: the polymer casting solution is coated on a low-density free On the woven glass plate, the height of the scraper is set at 100 μm to 500 μm, and after stretching, it is immersed in deionized water for 10 minutes to 60 minutes to obtain a support layer in the form of a flat film. Others are the same as those in the first or second embodiment.
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