Tianjin, China
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Zhao 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 | Wang L.,Tianjin Dagu Chemical Co. | And 4 more authors.
Catalysis Letters | Year: 2014

Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with HAuCl4•4H2O and BiCl3 as precursors and γ-Al2O3 as the support. Their catalytic performances for acetylene hydrochlorination were tested in a fixed-bed reactor under the fixed reaction conditions of temperature 150 °C, C2H2 hourly space velocity 120 h-1, feed volume ratio V (HCl)/V (C2H2) = 1.05. Then they were analyzed by the characterization methods of BET, XRD, SEM, TG, TPR and XPS. The results showed that the Au/γ-Al2O3 catalyst exhibited a high activity with only 0.1 wt% Au loading but it deactivated easily for both coke deposition and valance change. With the addition of Bi, it inhibited the reduction of Au3+ to Au0 in both the preparation and the reaction process. Besides, the coke deposition was apparently weakened. The best catalytic performance was obtained over 0.1Au5Bi/γ-Al2O3 catalyst with an acetylene conversion of 96 % and a selectivity to VCM of more than 99 % (Au loading, only 0.1 wt%) for running more than 10 h. Graphical Abstract: The Au-Bi/γ-Al2O3 catalyst can decrease significantly the Au loading from more than 1 to 0.1 wt% with the satisfied acetylene conversion compared with the activity carbon support. The addition of Bi can inhibited the reduction of Au3+ and coke deposition.[Figure not available: see fulltext.] © 2014 Springer Science+Business Media New York.


Li Y.C.,East China University of Science and Technology | Shen B.X.,East China University of Science and Technology | Wang L.,Tianjin Dagu Chemical Co. | Xiao W.G.,Tianjin Dagu Chemical Co.
Environment, Energy and Sustainable Development - Proceedings of the 2013 International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2013 | Year: 2014

Choosing 5A molecular sieve as the adsorbent to adsorb acetaldehyde microimpurity from PO product solution of 1500 t/a propylene epoxidation pilot-plant. Obtained the optimized process conditions of adsorbing the acetaldehyde impurities from PO product solution: the adsorption temperature was 15∼20°C and the liquid mass space velocity was 1 h-1. © 2014 Taylor & Francis Group, London.


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.


Wang L.,East China University of Science and Technology | Wang L.,Tianjin Dagu Chemical Co. | Shen B.,East China University of Science and Technology | Ren R.,East China University of Science and Technology | And 2 more authors.
Petroleum Processing and Petrochemicals | Year: 2014

The UDH mercury-free catalyst was prepared in a 10 L synthesis tank and was characterized by ICP-AES, BET, SEM and TEM. The comparison test for acetylene hydrochlorination with an industrial HgCl2 catalyst was conducted in a single pipe reactor under the same experimental conditions. The characterization results show that the UDH mercury-free catalyst has a micropore structure, the pore diameter is 2 nm, and the particle size of active component is 4 nm. The catalytic tests indicate that the VCM selectivity of UDH mercury-free catalyst is more than 99% which equals to that of the industrial HgCl2 catalyst. The C2H2 conversion of industrial HgCl2 catalyst is more than 98% in the first 900 hours, but declines in the following 700 hours; while the C2 H2 conversion of UDH mercury-free catalyst reduced slowly from 98% to 89% in the whole 1 600 hours runing, thus the mercury-free catalyst has better stability.


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.


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.


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.


Jiang Z.,East China University of Science and Technology | Shen B.-X.,East China University of Science and Technology | Zhao J.-G.,East China University of Science and Technology | Wang L.,East China University of Science and Technology | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2015

The conversion of chloromethane to light olefins over SAPO-34 modified with metal chloride has been investigated. The results show that the acid and the ratio of the strong acid density to the weak acid density can be regulated through modification with different metal chlorides. SAPO-34 modified with metal chloride showed a higher activity and better stability than SAPO-34, and the sample modified with FeCl3 presented the best stability among all of the investigated metal chlorides. The differences in catalytic behaviors among the samples modified with different metal chlorides suggest that the conversion of chloromethane to olefins is strongly influenced by the total acid density and the ratio of the strong acid density to the weak acid density. Coke formation and hydrogen transfer were alleviated over the samples modified with FeCl3, because of their lower total acid density and ratio of strong acid density to weak acid density compared to SAPO-34. © 2015 American Chemical Society.


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.


Trademark
Tianjin Dagu Chemical Co. | Date: 2011-05-31

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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