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RISS 인기검색어
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- 저자 : Pingfang Han (검색결과 2 건)
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Ya Li,Pingfang Han,Wei Wang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.1
SBA-15-NH2 and SBA-15-Cl Mesoporous Materials were prepared by modifying SBA-15 with silane coupling agent 3-aminopropyltriethoxysilane and 3-chloropropyltriethoxysilane using the post-synthesis method. The mesoporous samples were characterized by Fourier transform infrared spectra and nitrogen adsorption. Compared with SBA-15-NH2, SBA-15-Cl has suitable pore opening for further utilization in the immobilization of Candida sp.99-125 lipase by physical adsorption. The influences of lipase concentration and immobilizing time on the immobilization efficiency were investigated. Meanwhile, the lipase immobilized on SBA-15-Cl showed higher thermal, pH and storage stability than that of free lipase. Further study demonstrated that lipase immobilized on SBA-15-Cl could be used eight times without significant decrease of enzyme activity. The phenomenon was associated with the shrinkage of the pore opening of SBA-15-Cl keeping lipase from leaping out.
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Acoustically aided coalescence of water droplets and dehydration of crude oil emulsion
Wei Xie,Rui Li,Xiaoping Lu,Pingfang Han,Shanlong Gu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
We studied the use of acoustics for coalescence of water droplets and dehydration of crude oil emulsion. Experimental studies were conducted using acoustic standing waves in a resonant cavity to trap water droplets andenhance oil separation. The focus was on the effect of ultrasound irradiation on crude oil emulsion properties, such asviscosity, water drop radius, shear strength of oil-water interfacial films, and flocculation size of asphaltene. These propertiesare important to the coalescence of water drops in water-oil (W/O) emulsion in the process of oil separation withultrasound. Ultrasound irradiation is able to decrease the emulsion stability, which provides a new insight into theacoustics-aided demulsification mechanism. It can be considered as a supplement of traditional acoustics-aided demulsificationmechanism (ultrasound-induced motion of water droplets). Furthermore, the effects of ultrasonic parameterssuch as the type of ultrasonic field, irradiation time, frequency, and acoustic intensity on dewatering the W/O emulsionare discussed. These results provide guidance for setting the optimum conditions for the separation of W/O emulsionwith ultrasound. Under the optimum conditions, water content in crude oil emulsion can be decreased from 40%to 3.8%, which satisfies the requirement of dehydration for refinery.
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