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A series of alkylated tetralin fluids similar to naphthenic base oils were produced by the alkylation of tetralin and a-olefins, where the applied raw materials are totally derived from the coal chemical industry. The synthetic fluids were evaluated as lubricating base oils to reveal the structure-property correlations by controlling the product composition, and the properties of alkyltetralins depend on their structure. Alkyltetralins exhibited good properties, showing great potential for producing synthetic oils from coal-based chemicals. (See Chen Chen et al., Pages 20-28).
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Methanolysis of amides is a widely used strategy in synthetic organic chemistry for removing the acyl groups of amides, but is difficult to occur under mild conditions. A continuous tubular reaction technology is developed to safely and controllably intensify the amides methanolysis with high-temperature and high-pressure environment, and its space-time yield is over twice of that of the conventional batch reaction. The reaction rules and kinetics of acetanilide methanolysis was systematically studied as a representative, and the effects of substituent, steric hindrance and alkalinity were investigated by extending the tubular reaction method to the methanolysis of other amides. (See Pengcheng Zou, Kai Wang, Pages 170-178).
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Fundamentally understanding the formation mechanism of acrolein, as the main by-product of direct epoxidation of propylene with H2/O2, is very important to achieve the high yield of PO. This paper found that the oxygenated species (O*/OOH*/OH*) are able to enhance the adsorption energy of propylene, and can also be excellent promoters of propylene activation. The OOH* species on Au(1 1 1) surface is the most active species for propylene activation. In addition, three pathways of acrolein formation activated by O*/OOH*/OH* are examined to clarify that O* is the key species in acrolein formation in the presence of allyl groups (see Lin et al. Pages 39–49).
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The OV on the surface of layered TiO2 promotes the adsorption of molecular oxygen. In the process of CWAO, Cu loses electrons, and the electrons are transferred to the adjacent OV adsorbed molecular oxygen through the TiO2 carrier, which combines with water molecules to form HO·. HO· has a strong oxidation ability to attack the benzene ring structure of m-cresol, resulting in its ring opening, degradation, and mineralization (see Feng et al. Pages 338–348).
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2023年 第58卷 第6期 刊出日期:2023-06-28
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Permeation characteristics of light hydrocarbons through Poly(amide-6-b-ethylene oxide) multilayer composite membranes 任吉中 Ren Xiaoling Deng Maicun Li Hui摘要 ( 0 )
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