A kind of bifunctional composite film and its preparation method and application, method for removing plasticizer in liquor
A dual-function, composite membrane technology, applied in the preparation of alcoholic beverages, chemical instruments and methods, membrane technology, etc., can solve problems such as energy waste, resource waste, and impact on wine quality, and achieve the effect of improving removal rate and efficient separation
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[0033] The present invention also provides a method for preparing the bifunctional composite membrane described in the above technical solution, comprising the following steps:
[0034] Mix the adsorbent with water to obtain a dispersion;
[0035] Submerging the filter membrane in the dispersion liquid, followed by ultrasonication and drying to obtain a support membrane;
[0036] The dense layer material is formed into a film on the surface of the support membrane to obtain a bifunctional composite membrane.
[0037] In the invention, the adsorbent is mixed with water to obtain a dispersion liquid. In the present invention, the mass ratio of the adsorbent to water is preferably 1:10-500, more preferably 1:100-200; the mixing is preferably carried out under stirring and ultrasonic conditions in sequence, and the stirring speed is Preferably 80~210rpm, more preferably 100~200rpm, the time of the stirring is preferably 20~35min, more preferably 30min; the power of the ultrasoni...
Embodiment 1
[0052] 1g of nano activated carbon (particle size 100nm) was mixed with 100g of water, after stirring for 30min at a rotating speed of 200rpm, ultrasonic 15min was obtained at a power of 400W to obtain a dispersion;
[0053] Immerse the polyvinylidene fluoride microfiltration membrane with a non-woven fabric substrate in the dispersion, ultrasonically treat it for 15 minutes under the condition of a power of 400 W, and dry it at 50 ° C for 12 hours to obtain a supported membrane;
[0054] Scraping the film on the surface of the support film with polydimethylsiloxane modified by zeolite molecular sieve to obtain a bifunctional composite film, wherein the thickness of the dense layer is 30 μm;
[0055] use as figure 1 The shown pervaporation separation device carries out pervaporation separation, with 1000mL58 ° commercially available certain brand liquor (by GC-MS detection containing dibutyl phthalate concentration is 3mg / L, di-2-ethyl phthalate Hexyl ester is 6mg / L, n-diocty...
Embodiment 2
[0064] Mix 1g of ZIF-8 (with a particle size of 50nm) and 100g of water, stir at a speed of 200rpm for 20min, then sonicate for 20min at a power of 200W to obtain a dispersion;
[0065] Immerse the polyvinylidene fluoride ultrafiltration membrane in the dispersion, ultrasonically treat it for 15 minutes under the condition of a power of 100 W, and then dry it at 60° C. for 8 hours to obtain a support membrane loaded with adsorbent;
[0066] Scraping polyurethane on the surface of the support membrane to obtain a bifunctional composite membrane, wherein the thickness of the dense layer is 20 μm;
[0067] use as figure 1 The shown pervaporation separation device carries out pervaporation separation, and 1000mL58 ° commercially available white wine of a certain brand (by GC-MS detection containing dibutyl phthalate concentration is 4mg / L, di-2-ethyl phthalate Hexyl ester is 4mg / L, n-dioctyl phthalate 2mg / L, plasticizer total concentration is 10mg / L) is put into feed liquid tank ...
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