A kind of preparation method of silicone rubber composite hollow fiber membrane

Abstract

The invention discloses a preparation method of a silicone rubber composite hollow fiber membrane. The steps are: (1) adding dried nano-calcium carbonate to a modifier, stirring and reacting, and then repeatedly washing the nano-calcium carbonate with n-hexane to remove Excess modifying agent, vacuum drying, and finally grinding to obtain hydrophobic modified nano-calcium carbonate; (2) dissolve polydimethylsiloxane in n-hexane, stir evenly, add hydrophobic modified nano-calcium carbonate, ultrasonically disperse, Finally, add cross-linking agent and catalyst, stir and react, centrifuge and defoam to make casting solution; (3) immerse the dried neutral hydrophobic hollow fiber base membrane in casting solution for 2-3 seconds, and then take out Dry at room temperature, repeat the above-mentioned dipping and drying operations for 2 to 3 times, and vacuum-dry to complete cross-linking to obtain a hydrophobically modified nano-calcium carbonate-filled silicone rubber composite hollow fiber membrane. The process of the invention is simple, and the obtained hollow fiber membrane has good separation effect on low-concentration butanol / water solution, and has broad industrial application prospects.

Description

technical field [0001] The invention relates to a preparation method of a silicone rubber composite hollow fiber membrane used for pervaporation preferentially permeating butanol, and belongs to the field of pervaporation membrane separation. Background technique [0002] Affected by the energy crisis, oil prices have risen, butanol, as a new type of bioenergy, has received more and more attention. The product of butanol produced by biological fermentation (ABE fermentation) mainly contains acetone, butanol and ethanol, and the ratio of the three is 3:6:1. Mainly due to the inhibition of the product butanol, the total solvent concentration in the fermentation broth can only reach about 20gL -1 , lower production capacity. In order to solve the above problems, scientists try to combine some separation methods, such as pervaporation (PV), adsorption, liquid-liquid extraction, gas stripping and reverse osmosis, etc. (Ezeji, T.C., N. Qureshi, and H.P. Blaschek, Butanol ferment...

AI Technical Summary

Problems solved by technology

[0005] Although the silicone rubber membrane has good selectivity, its own film-forming property and mechanical properties are poor. Filling the silicone rubber with inorganic particles (such as molecular sieves, zeolites, etc.) An important development direction in the field of chemical film

However, key technical problems such as uneven dispersion of inorganic particles and poor interaction between organic layers and inorganic particles during the film-making process limit its further application.