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Men X.,Guizhou University | Men X.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | Zhu B.,Guizhou University | Lin Q.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | And 4 more authors.
Lizi Jiaohuan Yu Xifu/Ion Exchange and Adsorption | Year: 2013

Hydroiodic acid was prepared with crude iodine as raw materials and hydrazine hydrate as reductant by dynamic ion exchange method. The effects of flow rate through column, resin layer height, times through column, exchange media and other factors on concentration of hydrogen ion and exchange efficiency of ammonium were investigated. The results showed that when flow rate through column was 1.2mL/min, resin layer height was 33cm and zeolite combined with resin twice through column, concentration of hydrogen ion was 1.40mol/L and exchange efficiency of ammonium was 96%. With the vacuum degree of 0.07MPa and evaporating temperature of 80°C, 47% of hydroiodic acid was successfully prepared via vacuum distillation and all indexes met the requirements of industry standard of HG 3-952-76. Source


Men X.,Guizhou University | Men X.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | Zhu B.,Guizhou University | Lin Q.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | And 4 more authors.
Lizi Jiaohuan Yu Xifu/Ion Exchange and Adsorption | Year: 2014

Hydroiodic acid was prepared by static ion exchange method with the crude iodine recycled in the process of phosphoric acid production as raw materials. Based on the ion exchange mechanism judged by Helfferich dimensionless number and broken phase contact method, effects of resin amount, exchange time, stirring rate, exchange temperature and other factors on concentration of hydrogen ion and exchange efficiency of ammonium were investigated. The results showed that the ion exchange process was particle diffusion control. Concentration of hydrogen ion was 1.86mol/L and exchange efficiency of ammonium was 92%, when mass ratio of resins to crude iodine was 5:1, stirring rate was 600r/min, exchange time was 20min and exchange temperature was 40℃. With vacuum distillation at 80℃ under 0.07MPa, 47% of hydroiodic acid was successfully obtained. All indexes of the hydroiodic acid met the requirements of industry standard of HG 3-952-76. Source


Chang Y.,Guizhou University | Chang Y.,Guizhou Key Laboratory for Efficient Utilization of Mineral and Green Chemical Technology | Guo P.,Guizhou University | Guo P.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | And 7 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2014

The K2WO4-ZnCl2/γ-Al2O3 catalyst was prepared by impregnation and characterized by XRD, SEM, BET and TPD. The results showed that, the K2WO4-ZnCl2/γ-Al2O3 catalyst maintained a typical crystal structure of γ-Al2O3 and active components were dispersed well on the catalyst surface;the pores were typical cylindrical with mesoporous structure and the pore distribution was relatively concentrated;there were weak acid and weak base sites on the catalyst surface. The synthesis of methyl mercaptan from hydrogen sulfide and methanol over the K2WO4-ZnCl2/γ-Al2O3 catalyst was investigated. Under the optimum conditions of WHSV 2.0 h-1, n(H2S):n(CH3OH) 2:1, reaction temperature 400℃ and reaction pressure 1.0 MPa, the conversion of methanol, selectivity to methyl mercaptan and yield of methyl mercaptan were 87.85%, 91.43% and 80.32%, respectively. ©, 2014, Beijing Research Institute of Chemical Industry. All right reserved. Source


Guo P.,Guizhou University | Guo P.,Guizhou Key Laboratory for Efficient Utilization of Mineral and Green Chemical Technology | Chang Y.,Guizhou University | Chang Y.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | And 6 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

The effect of the templates on the preparation of mesoporous zirconia prepared by liquid phase method were studied, using ZrOCl2·8H2O as the source of zirconium and NaHCO3 as the precipitant. The microstructure, pore structure and the surface chemical properties of the crystals were characterized by XRD, SEM, BET and TPD. The results indicate that the templates had a great influence on the crystal phase composition, morphology, specific surface area, pore size distribution and the surface chemical properties. The t-ZrO2 was obtained with anionic SDS, and the m-ZrO2 was prepared with nonionic PEG-6000; The strength and the amount of weak acid on the surface of m-ZrO2 were greater than t-ZrO2, while the strength and the amount of weak base were less than t-ZrO2; Using anionic SDS as the template agent, mesoporous zirconia with tetragonal phase was successfully synthesized with the specific surface area of 214.76 m2/g, the weak acid site and weak base site both exiting on its surface area. ©, 2014, Chinese Ceramic Society. All right reserved. Source


Zheng B.-L.,Guizhou University | Zheng B.-L.,Guizhou Key Laboratory for Green Chemical and Clean Energy Technology | Zheng B.-L.,Guizhou Key Laboratory for Efficient Utilization of Mineral and Green Chemical Technology | Lin Q.,Guizhou University | And 16 more authors.
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2016

The active carbon was modified by Ni(NO3)2 for adsorption methane which from the low concentration coal-bed gas. In order to optimization the conditions of nickel modified active carbon the Box-Behnken central composite design experiments which based on the univariate tests and response surface method were used. The result showed that the optimized conditions of nickel modified active carbon were Ni(NO3)2 concentration 0.21 mol/L, temperature 730℃, and time 67 min. Under the conditions, the breakthrough time was 550 s, adsorption capacity was 58.07 mL/g, the modified active carbon has superior adsorption performance. © 2016, Science Press. All right reserved. Source

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