A kind of preparation method of hollow fiber membrane
A fiber membrane and hollow technology, which is applied in the field of preparation of hollow fiber membranes rich in sponge-like pores, can solve the problems of large diameter of pores in thin-walled sections of hollow fiber membranes, achieve large contact area, reduce the generation of finger-shaped pores, and inhibit The effect of entering the tunnel
Active Publication Date: 2018-12-18
NANJING UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to provide a method for preparing a PVDF hollow fiber membrane rich in spongy pores, so as to solve the problem that the diameter of the thin-walled section of the hollow fiber membrane prepared by the method for preparing the hollow fiber membrane in the prior art is too large. technical problem
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specific Embodiment
[0013] A kind of specific embodiment of the present invention carries out according to the following steps:
[0014] (1) Choose sorbitol, methine, glycine, perchloric acid, monoethanolamine, diethanolamine, 2-methylimidazoline, and phosphonic acid to mix three or more components as non-solvent additives. The weight ratio range in the solvent additive is: sorbitol 15-25%, methamine 10-30%, glycine 10-20%, perchloric acid 25-60%, monoethanolamine 5-20%, diethanolamine 5-20% %, 2-methylimidazoline 5-20%, phosphonic acid 25-60%.
[0015] (2) Choose N-methyl-2-pyrrolidone (NMP) or N, N-dimethylacetamide (DMAc) or N, N-dimethylformamide (DMF) as the solvent for the casting solution and the core solution .
[0016] (3) Use PVDF raw materials with a molecular weight of 800,000 to 1 million, and mix PVDF, solvent, and non-solvent additives so that the weight ratio of PVDF, solvent, and non-solvent ranges from 15% to 20%: 60% to 80%: 5% to 15% , After mixing, heat and stir at 60°C to...
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The invention discloses a method for preparing a hollow fiber membrane. The method comprises the following steps: (1) mixing more than three components in sorbitol, methionine, glycine, perchloric acid, monoethanolamine, diethanol amine, 2-methyl imidazoline and phosphonic acid to serve as non-solvent additives; (2) selecting N-methyl-2-pyrrolidone (NMP) or N,N-dimethylacetamide (DMAc) or N,N-dimethyl formamide (DMF) as a solvent of a membrane casting solution and core solution; (3) mixing PVDF, solvents and non-solvent additives, heating, stirring and dissolving at the temperature of 60 DEG C, performing vacuum pumping and defoaming, and taking the liquid as the membrane casting solution; and (4) spinning, namely taking deionized water as an external coagulating bath, mixing the water, solvents and non-solvent additives according to a weight ratio of 90:8:2 so as to prepare the core solution, and spinning by using a spinning nozzle. The PDVF hollow fiber membrane prepared by the invention is enriched in sponge-like pores, formation of finger-like pore passages can be obviously reduced, and the structural characteristics of the PVDF hollow fiber membrane are well improved.
Description
technical field [0001] The invention relates to a preparation method of a hollow fiber membrane rich in spongy pores, belonging to the technical field of hollow fiber membranes. Background technique [0002] Membrane contact absorption is a new type of high-efficiency absorption separation method. Its basic principle is to use the hollow fiber membrane as the gas-liquid contact interface to transfer the solute in the gas to the absorption liquid. Since the diameter of the hollow fiber membrane can be made very small (in the range of 0.5 to 1.0 mm), the filling density of the hollow fiber membrane is very high, which can form a huge absorption liquid-gas contact area in a unit space volume, and is smaller than The gas-liquid contact area formed by the filler in the conventional absorption tower is one to two orders of magnitude higher, thereby greatly increasing the absorption and mass transfer rate and enhancing the absorption effect. This absorption separation method in CO...
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IPC IPC(8): B01D67/00B01D69/08B01D71/34
CPCB01D67/0002B01D69/08B01D71/34
Inventor 龚惠娟陈泽智
Owner NANJING UNIV