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Shanghai, China

Huang H.,Ningbo University of Technology | Huang H.,East China University of Science and Technology | Cao G.,East China University of Science and Technology | Wang S.,Shanghai Huayi Group
Korean Journal of Chemical Engineering | Year: 2013

The effect of trimethyl phosphate on Cu/Zn catalyst prepared by co-precipitation method for hydrogenation of methyl laurate to dodecanol in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, EDS, XPS, SEM and BET. The results indicated that catalytic activity decreased with the increased amount of trimethyl phosphate. Correlating with the results from the above characterization, it was found that the main cause for the catalyst deactivation was the trimethyl phosphate occlusion of active sites by the physical adsorption and BET surface area decrement. © 2013 Korean Institute of Chemical Engineers, Seoul, Korea. Source

Cai Q.-B.,Shanghai Huayi Group | Cai Q.-B.,East China University of Science and Technology | Dai G.-C.,East China University of Science and Technology
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2011

The trailing vortices around a hydrofoil impeller were investigated in a 0.383 m i.d. stirred tank with a 0.188 m i.d. hydrofoil impeller using PIV and LES. The comparison between angle-averaged axial velocities by LES and PIV data was in very good agreement, verifying the validity and effectiveness of LES simulation. The presence of trailing vortices formed around the hydrofoil impeller blades were indicated by the mean velocity vectors near the edge of blades, the contours of turbulence levels and kinetic energy of turbulence. It was found that single trailing vortex formed around each blade. The vortex axis was identified to fall on the cylinder swept by the blade tip. The effect of trailing vortices on the turbulence structure was also discussed. The maximum normalized kinetic turbulence energy k/V tip 2 was about 0.04~0.06, which was located at 0.5 < Z/D T < 0.67 and 0.3 < r/R < 0.4. The research results could be used to improve the mixing process. Source

The present invention provides a process for regenerating a deactivated heteropolymolybdophosphoric acid catalyst, comprising the steps of grinding the deactivated catalyst into particles having a particle size of 40 mesh or less, mixing the particles with a mixture comprising aqua ammonia, which is an aqueous solution containing ammonium ions and organic auxiliaries, kneading the mixture of particles and aqua ammonia in a kneader to obtain a paste, drying the paste, molding the paste into cylindrical particles with a through hole in its longitudinal axis, and heating the paste in atmosphere at 350450 C. for 110 hours to produce the generated catalyst.

Shanghai Huayi Group | Date: 2013-11-21

Disclosed are a catalyst and preparation method and use thereof. The catalyst has a constitution represented as the formula below, wherein, D represents at least one element selected from the group consisting of copper, magnesium, manganese, stibium and zinc; E represents at least one element selected from the group consisting of tungsten, silicon, nickel, palladium, ferrum and plumbum; Z is selected from the group consisting of SiC, MoO

Shanghai Huayi Group | Date: 2013-11-21

Disclosed are a ferrite catalyst and preparation methods thereof. The catalyst is provided with a formula below, wherein A is Mg atom, Zn atom or a mixture of both atoms at any ratio; D is one or more atoms selected from the group consisting of Ni, Co, W, Mn, Ca, Mo or V atom; Z is a catalyst carrier, which is one or more selected from the group consisting of calcium phosphate, calcium dihydrogen phosphate, aluminium phosphate, aluminium dihydrogen phosphate, ferric phosphate, magnesium phosphate, zinc phosphate, MgAl hydrotalcite, calcium carbonate, magnesium carbonate; a=0.01-0.6; b=0-0.30; c is a number balancing each valence; x, y represent the amounts of principal catalyst and carrier Z respectively, wherein the weight ratio y/x=0.5:1-7:1.

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