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Tianjin, China

Zhao J.,East China University of Science and Technology | Zeng J.,East China University of Science and Technology | Cheng X.,East China University of Science and Technology | Wang L.,East China University of Science and Technology | And 3 more authors.
RSC Advances | Year: 2015

The bimetal catalyst gold(iii) chloride-copper(ii) chloride (AuCl3-CuCl2) was prepared with several different gamma-aluminium oxide (γ-Al2O3) supports and its catalytic properties towards acetylene hydrochlorination were assessed in a fixed-bed reactor. The comparison indicated that one of the catalysts attained the highest activity with an acetylene conversion of 97%, which was far higher than the others. Catalysts were characterized using detailed X-ray diffraction, nitrogen-Brunauer, Emmett and Teller surface area analysis (N2-BET), ammonia temperature-programmed desorption, Fourier-transform infrared spectroscopy and carbon dioxide temperature-programmed desorption analysis. It is proposed that the base site contributed to its high catalyst activity compared with the other catalysts, instead of the acid site or the textural properties on the support, therefore, the activity and the life of the catalysts can be improved significantly by treating the supports with potassium hydroxide. In addition, the results of N2-BET, thermogravimetric analysis and scanning electron microscopy indicated that the catalysts deactivated rapidly because of carbon deposition, and the actual amount of coke deposition was 18.0% after the reaction. AuCl3-CuCl2/γ-Al2O3 was easily regenerated for reuse as a catalyst by burning off in an air atmosphere for 10 min. The activity of the regenerated catalyst nearly reached the level of the fresh catalyst. This journal is © The Royal Society of Chemistry 2015. Source


Li Y.,East China University of Science and Technology | Shen B.,East China University of Science and Technology | Xiao W.,Tianjin Dagu Chemical Co. | Zhao J.,East China University of Science and Technology
Petroleum Processing and Petrochemicals | Year: 2013

A direct propylene epoxidation demonstration unit with 1 500 t/a capacity with catalyst TS-1 has been stably running for 4 000 h. The results indicated that the hydrogen peroxide conversion and the propylene oxide (PO) selectivity is maintained at 90%-96% and 90%-92%, respectively, meeting the unit design requirement. The quality of the product PO purified by distillation is in line with the national superior grade standard. By the direct propylene epoxidation technology, the pollutions of waste materials can be solved and the energy consumption can be reduced. And the existing problems and applying prospects are also discussed. Source


Wang S.-J.,East China University of Science and Technology | Shen B.-X.,East China University of Science and Technology | Xiao W.-G.,Tianjin Dagu Chemical Co. | Song Q.-L.,East China University of Science and Technology | Zhao J.-G.,East China University of Science and Technology
Huadong Ligong Daxue Xuebao /Journal of East China University of Science and Technology | Year: 2010

Au-K/C catalysts for hydrochlorination of acetylene were prepared by wet impregnation and characterized by XRD, SEM and BET. The results indicate that the active ingredients are highly dispersed on the surface of carrier. Optimized reaction conditions, reaction temperature 170°C, space velocity 120 h-1, feed volume ratio (VHCl/VC2H2) 1.10, are obtained based on the detailed study of effects of temperature, space velocity, feed ratio and reactants on the performances of Au-K/C catalysts in atmospheric fixed bed reactor. In the optimized reaction conditions, Au-K/C catalyst is tested for 120 h in which the acetylene conversion and vinyl chloride (VC) selectivity are over 96.0% and 99.5%, respectively, without significant drop of catalytic activity. Source


Wang S.,East China University of Science and Technology | Shen B.,East China University of Science and Technology | Xiao W.,Tianjin Dagu Chemical Co. | Song Q.,East China University of Science and Technology
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2010

Gold-supported catalysts for acetylene hydrochlorination were prepared with Au(en)2Cl3 as precursor and analyzed by the characterization methods of N2-adsorption, XRD and TEM. Effects of gold valence, support, Au loading and alkali metals on the catalytic performances of gold-supported catalysts were studied in detail at an atmospheric fixed bed reactor. The results indicated that the active constituents of gold-supported catalysts for hydrochlorination of acetylene were ionic Aun+. With activated carbon derived from coconut shell(ACS) as the support, KCl as the promoter and Au loading of 1%, gold-supported catalyst Au-K/ACS was of high dispersity and high catalytic activity for acetylene hydrochlorination. Under the reaction conditions of temperature 180°C, total gas hourly space velocity (GHSV) 240 h-1, feed volume ratio V(HCl)/V(C2H2)=1.1, the conversion of acetylene was up to 98% and the selectivity to vinyl chloride was more than 99.5%. In addition, the stability of Au-K/ACS catalyst was still favorable, even the GHSV was up to 2000 h-1. Source


Trademark
Tianjin Dagu Chemical Co. | Date: 2011-06-14

PVC Resin; Caustic Soda; Propylene Oxide; Polyether Polyols; Polymer Polyol; Styrene; industrial chemicals, namely, Acrylonitrile-Butadiene Styrene; Vinyl Chloride; Ethylene Dichloride; Polystyrene resin; Expandable Polystyrene resin; General-Purpose Polystyrene resin; High Impact Polystyrene resin; Oxygen; Nitrogen; Chlorine Liquid; Hydrochloric Acid; Sodium Hypochlorite; Hydrogen; Propylene Dichloride; ; Barium Sulphate; Barium Chloride; industrial chemicals, namely, Sodium Peroxide; unprocessed Polycarbonate; Phenol; Acetone; Cumene; Acrylic Acid; industrial chemicals, namely, Methyl acrylate, Ethyl Acrylate, Propyl Acrylate, Butyl Acrylate, and Ethyl-Hexyl Acrylate; Butadiene.

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