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RISS 인기검색어
- 검색키워드
- 저자 : Huiwen Huang (검색결과 5 건)
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Huiwen Huang,Hui Zhu,Qiang Zhang,Chunyi Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.2
Hierarchical ZSM-5 zeolites with different SiO2/Al2O3 ratio but similar crystal size were directly synthesized by a single-template hydrothermal method, and the intrinsic effect of acidic properties on their catalytic performance in methanol to gasoline (MTG) reaction was comprehensively investigated. The physicochemical properties of HZSM-5 zeolites were characterized by XRD, N2 adsorption-desorption, SEM, NH3-TPD, FTIR, and TGA techniques. The results show good linear correlations between the yields of gasoline components and the relative content of Brønsted acid sites, and the hierarchical HZSM-5 zeolite with SiO2/Al2O3 molar ratio of 200 was firstly found to exhibit high reactivity, excellent product distribution and superior stability in MTG reaction, which can be attributed to its appropriate acid distribution with moderate Brønsted acid sites and proper B/L ratio, predominantly promoting gasoline range hydrocarbons production and inhibiting side reactions.
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Huiwen Yan,Lei Sun,Jinge Huang,Yixing Qiu,Fuchao Xu,Riming Yan,Du Zhu,Wei Wang,Jixun Zhan 한국미생물학회 2018 The journal of microbiology Vol.56 No.11
A new type III polyketide synthase gene (Ssars) was discovered from the genome of Shiraia sp. Slf14, an endophytic fungal strain from Huperzia serrata. The intron-free gene was cloned from the cDNA and ligated to two expression vectors pET28a and YEpADH2p-URA3 for expression in Escherichia coli BL21(DE3) and Saccharomyces cerevisiae BJ5464, respectively. SsARS was efficiently expressed in E. coli BL21(DE3), leading to the synthesis of a series of polyketide products. Six major products were isolated from the engineered E. coli and characterized as 1,3-dihydroxyphenyl- 5-undecane, 1,3-dihydroxyphenyl-5-cis-6 -tridecene,1,3-dihydroxyphenyl- 5-tridecane, 1,3-dihydroxyphenyl-5-cis-8 - pentadecene, 1,3-dihydroxyphenyl-5-pentadecane, and 1,3- dihydroxyphenyl-5-cis-10 -heptadecene, respectively, based on the spectral data and biosynthetic origin. Expression of SsARS in the yeast also led to the synthesis of the same polyketide products, indicating that this enzyme can be reconstituted in both heterologous hosts. Supplementation of soybean oil into the culture of E. coli BL21(DE3)/SsARS increased the production titers of 1–6 and led to the synthesis of an additional product, which was identified as 5-(8 Z,11 Z-heptadecadienyl) resorcinol. This work thus allowed the identification of SsARS as a 5-alk(en)ylresorcinol synthase with flexible substrate specificity toward endogenous and exogenous fatty acids. Desired resorcinol derivatives may be synthesized by supplying corresponding fatty acids into the culture medium.
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Efficient production of propylene and gasoline from methanol in multi-regime riser
Xiaojing Meng,Huiwen Huang,Qiang Zhang,Chunyi Li,Qiukai Cui 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
High gas-solid contact efficiency and low solid back-mixing are necessary to both promote methanol conversion and inhibit side reactions. Thus, a novel multi-regime reactor with dense-phase reaction section and dilutephase conveying region was designed. The reactor promoted stable reaction activity during a 300 h pilot-scale evaluation with high yields of propylene and gasoline. A process for maximum propylene and gasoline production from methanol (PGFM) characterized by moderate operating severity, application of ZSM-11 catalyst and novel reactor, and stratified reprocessing or etherification of light gasoline and C4 olefins was proposed. The PGFM process can be implemented in the existing FCC process and is considered to be more economic and flexible.
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Conversion of methanol into light olefins over ZSM-11 catalyst in a circulating fluidized-bed unit
Xiaojing Meng,Huiwen Huang,Qiang Zhang,Minxiu Zhang,Chunyi Li,Qiukai Cui 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
Methanol conversion and the reaction pathway were investigated in a pilot-scale circulating fluidized-bed (CFB) unit over hierarchical ZSM-11 catalyst. Experimental results indicated that ZSM-11 catalyst was highly resistant to external coke due to the formation of mesopores. Elevated temperatures favored the production of propylene and butylene and decreased the yield of ethylene. Additionally, no direct relations were shown between the formation of ethylene and other products under different pressures, suggesting that ethylene was a primary product produced at the initial of the reaction. Methylation-cracking and oligomerization were verified as the main reaction pathway for the formation of C3 + alkenes., Methylation and oligomerization of olefins were dominated under high methanol partial pressure and consequently responsible for the production of higher olefins, while the b-scission of C7 = for propene and butylene, and C8 = for butylene were enhanced at low methanol partial pressure.
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Effect of Wall Structures on Mechanical Properties of Small Caliber PHBHHx Vascular Grafts
Jing Gao,Zhenzhen Huang,Huiwen Guo,Shunzhu Tian,Lu Wang,Yuling Li 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
In order to analyze the effect of vascular wall structures on static and dynamic mechanical properties of vasculargrafts, small calibre PHBHHx (Poly(3-hydroxybutyrate-co-3-hydroxhexanoate)) vascular grafts (inner diameter 6 mm) withvarious wall shapes and thicknesses were fabricated by changing electrospinning time and receiving molds. As spinning timeincreased, wall thickness of the vascular grafts increased and both circumferential tensile strength and suture retentionstrength improved significantly. When the wall thicknesses of straight grafts were about 120 μm, the great radial dynamiccompliance was exhibited, however, the tensile strength and suture retention strength of the straight tubes can’t reach therequirements of normal blood vessel grafting. With the wall thicknesses increasing above 250 μm, although thecircumferential tensile strength and suture retention strength gradually achieved the transplanting requirements, the dynamiccompliance of the straight tubes declined too sharply to adapt the blood radial shock. For corrugated grafts, the effect of wallthickness on radial dynamic compliance was little, and the radial dynamic compliance was close to that of the commercialvascular grafts. The circumferential tensile strength and suture retention strength of the corrugated grafts were also improvedto approach the commercial vessels’ performances with the wall thickness improving to about 425 μm. Elastic recovery ratesof all the prepared vascular grafts were superior to that of the commercial sample. Along with the wall thickness exceeding250 μm, the water permeabilities of both the straight and the corrugated grafts were less than 300 ml/(cm2·min).
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