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Shanghai, China

Ding J.,Yancheng Institute of Technology | Ding J.,Nanjing University of Technology | Chen L.,Yancheng Institute of Technology | Shao R.,Yancheng Institute of Technology | And 4 more authors.
Reaction Kinetics, Mechanisms and Catalysis | Year: 2013

N,N-dimethyldodecylamine was produced by the catalytic hydrogenation of N,N-dimethyldodecylamide over a Ni/γ-Al2O3 catalyst. During the process, there was a side reaction: the catalytic hydrogenation of N,N-dimethyldodecylamide produced dodecyl alcohol and dimethylamine. Therefore, dimethylamine was introduced into the raw materials, which would suppress the side reaction. The Ni/γ-Al2O3 catalyst obtained from the reduction of the NiO/γ-Al2O3 catalyst in an autoclave had higher surface area and nickel dispersion and the amount of coke was less. Therefore, the catalyst had higher activity and stability. In this case, the hydrogen gas was a raw material and a reducing agent, and reduction of the NiO phase and the hydrogenation reaction were carried out synchronously. Under the conditions of dimethylamine introduction and the Ni/γ-Al 2O3 catalyst obtained from the reduction of the NiO/γ-Al2O3 catalyst in the autoclave, the N,N-dimethyldodecylamide conversion, the N,N-dimethyldodecylamine selectivity and yield were 98.0, 99.0 and 97.1 %. © 2012 Akadémiai Kiadó, Budapest, Hungary. Source


Ding J.,Yancheng Institute of Technology | Shao R.,Yancheng Institute of Technology | Wu J.,Yancheng Institute of Technology | Dong W.,Shanghai Fine Chemical Co. | Dong W.,China Research Institute of Daily Chemical Industry
Asian Journal of Chemistry | Year: 2012

The catalytic hydrogenation of p-nitro phenol to produce p-amino phenol was carried out over the catalyst nickel supported on active carbon. The calcinated temperature was one of the most important technical conditions: temperature higher than 450 °C would result in the reduction of NiO to Ni phase by activated carbon and the loss of support. The surface area and nickel dispersion over catalyst decreased obviously after 450 °C calcinated temperature because of the loss of support and the Ni phase sintering. Source


Du M.,China Research Institute of Daily Chemical Industry | Li Q.,China Research Institute of Daily Chemical Industry | Dong W.,Shanghai Fine Chemical Co. | Geng T.,China Research Institute of Daily Chemical Industry | Jiang Y.,China Research Institute of Daily Chemical Industry
Research on Chemical Intermediates | Year: 2012

A series of M/MgO (M = CaO, KNO 3, KOH, K 2CO 3) catalysts were prepared by a dry impregnation method and used for synthesis of glycerol carbonate from glycerol and dimethyl carbonate. It was found that K 2CO3/MgO was the most efficient catalyst, with a glycerol carbonate yield of approximately 99% under the conditions: DMC/glycerol molar ratio 2.5:1, catalyst/raw material weight ratio 1%, reaction time 2 h, and reaction temperature 80 °C. FTIR, BET, TEM, and XRD were used for characterization of the catalyst and showed that the active sites seemed to be K 2O formed on the K 2CO3/MgO catalyst. Finally, a recycling experiment showed that the catalyst was relatively stable and could be reused up to four times, at least, by regeneration. © Springer Science+Business Media B.V. 2011. Source


Zhang W.,Julich Research Center | Zhang W.,Shanghai Fine Chemical Co. | Allgaier J.,Julich Research Center | Zorn R.,Julich Research Center | Willbold S.,Julich Research Center
Macromolecules | Year: 2013

In this work, 1H NMR was used to examine the anionic copolymerization kinetics of ethylene oxide and 1,2-butylene oxide. The in situ NMR technique allows monitoring the concentration profiles of both monomers simultaneously. A series of polymerization experiments at different monomer and initiator concentrations were done in order to determine the copolymerization rate constants. The data were evaluated by fitting the result of a numerical solution of the kinetic differential equations to the NMR data. This procedure allowed calculating all four rate constants, kEE, kEB, kBE, and kBB, individually instead of the commonly determined reactivity ratios rE = kEE/kEB and rB = kBB/kBE. The monomer incorporation into the copolymer chains is dominated by the different reactivities of the monomers, whereas the nature of the chain ends is of minor importance. In the system investigated ethylene oxide is about 6.5 times more reactive than 1,2-butylene oxide. The compositional profiles of the final copolymers can be calculated from the time-resolved concentration profiles. If both monomers are present at the start of the polymerization the compositional profiles have a sigmoidal shape with one chain end containing mainly ethylene oxide and the other chain end being formed almost exclusively of butylene oxide units. However, with the knowledge of the copolymerization rate constants it is possible to realize other compositional profiles. If the reactor is first charged with ethylene oxide the addition rates of butylene oxide can be calculated in order to obtain any other arbitrarily chosen compositional profile. © 2013 American Chemical Society. Source


Ding J.,Yancheng Institute of Technology | Shao R.,Yancheng Institute of Technology | Wu J.,Yancheng Institute of Technology | Dong W.,Shanghai Fine Chemical Co. | Dong W.,China Research Institute of Daily Chemical Industry
Asian Journal of Chemistry | Year: 2011

The catalyst NiO/γ-Al2O3 was modified with deposited carbon by impregnation of alumina with aqueous solution of Ni(H 2NCH2CH2NH2)x(NO 3)2 and used in dehydrogenation of isobutane to isobutene in presence of carbon dioxide. The results indicated that the carbon modification can decrease the total acidity of the NiO/γ-Al 2O3 catalyst and it has low acidity and anticoking performance, so it is effective on suppressing the coke formation and side reactions occurrence. Therefore, the catalyst stability and the isobutene selectivity are improved significantly by the carbon modification. Source

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