Shaanxi Coal and Industry Technology Development Co.

Fengcheng, China

Shaanxi Coal and Industry Technology Development Co.

Fengcheng, China
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Zhang L.,Northwest University, China | Zhang L.,Shaanxi Coal and Industry Technology Development Co. | Cao B.,Northwest University, China | Tang Y.-J.,Shaanxi Coal and Industry Technology Development Co. | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2010

After determining to use the homogeneous rhodium catalyst, it is necessary to do research on the small test device for further study on the pilot plant. By selecting precious metals rhodium as the main catalyst and methyl iodide as promoter, using methyl acetate, methanol and CO as feedstock, and choosing zirconium autoclave, the acetic anhydride and co-product acetic acid were synthesized through homogeneous carbonylation. Under the reaction conditions of 180-200°C, pressure 3.0-6.0 MPa, catalyst mass fraction 700×10-6-1000×10-6, methyl iodide 10%-15% and residence time 70-90 min, the selectivity of acetic anhydride is 95.4%(as CO), the conversion rate of CO is 97.4% and the acetic anhydride product yield is 92.9%; the space-time yield of catalyst is 38 671.28 g/(mol·h) (as acetic anhydride). The parameters of such process can preliminary guide the pilot and provide the basic data for industrialization.


Zhang L.,Northwest University, China | Zhang L.,Shaanxi Coal and Industry Technology Development Co. | Tang Y.-J.,Shaanxi Coal and Industry Technology Development Co. | Yang Y.-H.,Northwest University, China | Ma X.-X.,Northwest University, China
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

By using the platinum group metals rhodium and iridium as main component and α-Al2O3 as carrier to make bimetallic heterogeneous catalyst, the optimal catalyst preparation conditions and the catalytic effect were investigated. The rhodium nitrate and iridium nitrate were used as catalyst precursor. Rhodium was impregnated and calcinated firstly, and then iridium. A group of catalysts with different Rh and Ir mass fractions were prepared. The mass fraction of the metals in catalyst support was characterized by ICP-AES method. The experimental results show that Rh-Ir bimetallic heterogeneous catalyst with high activity and stability can be prepared when the mass fraction of Rh and Ir is 0.5% and 0.3%, respectively, calcination temperature is 450 °C for Rh and 550°C for Ir, and calcinations time is 2 h. The new bimetallic catalysts were investigated in an autoclave to produce acetic acid. The space-time yield of acetic acid (STY) is near 18 mol/(L·h), the methanol conversion is 60.1% and the selectivity of acetic acid is 99.2% under the optimum reaction conditions of reaction temperature 180 °C, reaction pressure 4.0 MPa, reaction time 30 min, n(MeOH):n(AcOH): n(MeOAC):n(MeI)=1:1:0.3:0.2, total volume 200 mL.


Zhang L.,Northwest University, China | Zhang L.,Shaanxi Coal and Industry Technology Development Co. | Tang Y.-J.,Shaanxi Coal and Industry Technology Development Co. | Wang Z.-Y.,Shaanxi Coal and Industry Technology Development Co. | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2011

To investigate the preparation process of rhodium chloride and develop a new solvent to dissolve rhodium easily, the catalytic properties of the produced rhodium chloride in methanol carbonylation reaction were discussed for the production of anhydride and acetic acid. With rhodium metal as rhodium source, the rhodium chloride was prepared from self-made dissolvant R101 at one-step, the R101 then was recovered by rotary evaporator, and the rhodium chloride was obtained after being dried. It is characterized by XPS, SEM, XRD and ICP to demonstrate its high catalytic properties. The study also determined the optimal process parameters. This synthesis process of rhodium chloride shows high yield and high purity, and the dissolvant can be recovered from rotary evaporator, which can reduce the production cost. The produced rhodium chloride also shows high reactivity in methanol carbonylation process. Under the optimizing process conditions, synthesized rhodium chloride has high purity and the catalytic performance is excellent. The rhodium chloride produced has very good commercialized application foreground.


Zhang L.,Shaanxi Coal and Industry Technology Development Co. | Qi M.,Shaanxi Coal and Industry Technology Development Co. | Zhang D.-L.,Daqing Petrochemical Company | Yang K.-N.,Shaanxi Coal and Industry Technology Development Co. | Wu Y.-X.,Shaanxi Coal and Industry Technology Development Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2014

CuOx/4A catalysts with different Cu loading were investigated to produce benzaldehyde by hydrogen peroxide in liquid-phase oxidation. The CuOx/4A catalysts were characterized by N2-isothemy adsorption desorption, XRD and H2 temperature-programmed reduction. Under the condition of benzyl alcohol 20 mL, H2O2 30 mL, 80°C, catalysts 0.2 g, 5 h, mass fraction 6% CuOx/4A catalyst has the highest reactivity, with the conversion rate of benzyl alcohol 49.5%, the selectivity and yield of benzaldehyde 83.6% and 41.4% respectively. Cu and Cu loading affects the surface area, volume and redox property of the catalysts. The result shows that mass fraction 6% CuOx/4A catalyst has higher reactivity, due to highly-dispersed Cu-O species and lower redox temperature.

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