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DEER FEEDING FOR VELVET PRODUCTION
Quankai Wang,Fengxi Liang,Tiefeng Wen 건국대학교 동물자원연구센터 1993 국제 심포지움 Vol.- No.4
숫사슴은 녹용을 직접 생산한다. 숫사슴을 사양하는 목적은 종록으로서의 번식활동뿐만 아니라 녹용이라는 생산물을 생산하는 것이다. 이 때문에 종록으로서의 번식력과 녹용의 생산력을 충분히 발휘할 수 있도록 적절한 영양관리를 하여 과비나 수척하지 않도록 하여야 한다. 즉, 적당한 운동을 하여 정액의 품질을 높이고, 번식년한을 연장하는등 숫사슴의 잠재력을 최대한 발휘시키는 합리적인 이용에 노력하여야 한다. 본 논문은 주로 숫사슴의 사료, 계절별 영향섭취, 1일금여사료 배합량, 녹용생장기의 사양관리, 번식기의 사양관리, 월동기의 사양관리, 자록숫컷의 사양관리, 육성기의 사양관리, 광량조절에 의한 사양등의 내용을 소개한다. Chinese mainly raise Sika ( Cervus nippon ) and Wapiti ( Cervus elaphus ). Deer are raised in yard, which is a majar model of deer raising in China. The purpose of raising stags is to steadily improve their health level, to gain high quality velvet antlers and to cultivate good sexual desire, high semen quality and breeding value stags. Stags can directly affect velvet yield, offspring quality and deer group development. Therefore, it is very important to steadily improve deer feeding and management level.
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Rong Liu,Shuting Lyu,Tiefeng Wang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
The feasibility of producing acrolein from crude glycerol was studied by the dehydration reaction overH3PW12O40 (HPW) supported on Cs-modified SBA-15 (HPW/Cs-SBA). The influence of impurities incrude glycerol was investigated. Only the alkali metal ions caused catalyst deactivation and decreasedthe acrolein selectivity because they decreased the amount of catalytically effective medium Brønstedacid sites. This problem was solved by glycerol desalination, and a stable acrolein yield of 85% wasobtained through 60 h of reaction, which was as good as that with pure glycerol. In addition, HPW/Cs-SBA showed good thermal stability and regeneration ability after the reaction with desalted crudeglycerol.
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Xinfeng Lv,Lan Xiang,Tiefeng Wang,Shanjun Du 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
In the face of the dwindling reserves of high-quality phosphate rock resources in the world, beneficiationand purification of low-grade phosphate ore is a possible solution to alleviate the growing scarcity forstrategic phosphorus resources. Hydrocyclone is one of the common equipment for solid–solid separationin liquid medium, which is suitable for mineral beneficiation processing. The study investigated theindustrial beneficiation of low-grade phosphate ore by novel hydraulicbarrier-hydrocyclone. The resultsfrom computational fluid dynamics (CFD) simulation revealed that Semi-through hydraulicbarrier (S-Hb)hydrocyclone had the optimal performance, making short-circuit flow reduced to 7.17% and eliminatingfish hook effect, so that the classification efficiency increased by 5% and separation sharpness reached0.9516. The reasons leading to performance intensification were elaborated in accordance with the optimizationand integration of hydrodynamics multiphase flow field by hydraulicbarrier, including the pressure,velocity, turbulent kinetic energy distribution and air core development, as well as streamlineanalysis, etc. The results from practical industrial experiment indicated that the P2O5 grade was increasedto 23.6wt.% from an initial grade of 17.5wt.%, meeting the medium-grade phosphate ore specifications,and the SiO2 content was decreased from 29.0wt.% to 4.2wt.%, meanwhile, the proportional error was0.74% about cutting size compared to simulation results, indicating excellent consistency. The investigationoffered an economically viable route to beneficiate the low-grade phosphate ore, cogently supportingsustainable development of phosphorus resources in chemical engineering.
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Yafei Li,Xiaocheng Lan,Boyang Liu,Tiefeng Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
A stable and highly efficient supported Cu-Ni catalysts for the conversion of ethyl levulinate (EL) toc-valerolactone (GVL) was developed. The catalysts were characterized by XRD, TEM, TPD, TPR, andXPS. The support effect of metal oxides (Al2O3, SiO2, ZrO2, and TiO2) revealed that Cu-Ni supported onAl2O3 showed the highest activity for EL hydrogenation to ethyl 4-hydroxypentanoate (EHP) and thesubsequent intramolecular esterification of EHP to GVL. EHP intramolecular esterification to GVL in theethanol solution was a reversible reaction with an equilibrium constant of 24 at 453 K. A simplified reactionkinetic network was established. The solvent had a significant influence on the reaction equilibriumand the catalyst stability. Cu-Ni/Al2O3 in n-hexane solvent gave a higher GVL yield than that in ethanolsolvent, and showed better recyclability than that in toluene solvent. With optimizing the conditions, Cu-Ni/Al2O3 gave 99.9% conversion and 98% selectivity to GVL with a space–time yield of 1.13 gGVL gcat-1 h1 inn-hexane solvent with good recyclability.
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Babar Ali,Xiaocheng Lan,Muhammad Tahir Arslan,Syed Zulfiqar Ali Gilani,Huanjun Wang,Tiefeng Wang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
Glycerol dehydration to value-added acrolein over zeolite catalysts is a useful approach to offer asustainable economic route for the biodiesel industry. Glycerol dehydration over H-ZSM-5 withconventional morphology often exhibits a significant mass transfer limitation and inhibits the access toactive sites in the micropores, which causes low activity, selectivity, and severe catalyst deactivation. Inthis study, a significant impact of b-axis channel length on acrolein selectivity and catalyst activity wasrevealed by using H-ZSM-5 synthesized with varied channel length in b-axis of 60, 130, 180, and 250 nm. Complete glycerol conversion and high acrolein selectivity (88%) were observed over H-ZSM-5 with60 nm channels length in b-axis, due to high availability of active sites and enhanced diffusion throughthe shortest channels, which dramatically suppressed the coke formation. The catalysts with long b-axischannels exhibited a slow internal diffusion, leading to increased polymerization side reactions and cokeformation.
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