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RISS 인기검색어
- 검색키워드
- 저자 : Meng Xiaojing (검색결과 3 건)
- 무료
- 기관 내 무료
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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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Molecular mechanisms of 1,2-dichloroethane-induced neurotoxicity
Xiang Yang,Zhang Xiaoshun,Tian Zhiling,Cheng Yibin,Liu Ningguo,Meng Xiaojing 한국독성학회 2023 Toxicological Research Vol.39 No.4
The production of industrial solvents and adhesives often utilizes 1,2-dichloroethane (1,2-DCE), a highly toxic halogenated hydrocarbon compound. Occupational 1,2-DCE poisoning occurs frequently and is a public health concern. Exposure to 1,2-DCE can damage the brain, liver, and kidneys. The main and most severe damage caused by exposure to 1,2-DCE is to the nervous system, especially the central nervous system. Current research on 1,2-DCE mainly focuses on the mechanism of brain edema. Several possible mechanisms of 1,2-DCE neurotoxicity have been proposed, including oxidative stress, calcium overload, blood–brain barrier damage, and neurotransmitter changes. This article reviews the research progress on 1,2-DCE neurotoxicity and the mechanism behind it to provide a scientific basis for the prevention and treatment of 1,2-DCE poisoning.
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