ABSTRACT
In this paper, research on chloride ion gas-solid distribution in the process of desulfurization wastewater evaporation was carried out. The factor analysis of temperature, pH, and concentrations of Cl- Na+, Ca2+ and Mg2+ was explored by orthogonal experiments. Results show that the distribution coefficient increases with increasing temperature and Mg2+ concentration and decreasing pH, but decreases with increasing concentrations of Cl-, Ca2+ and Na+; The interaction and significance of each factor were compared and analyzed, and the order of influence significance on the chloride ion gas-solid distribution coefficient is listed as: temperature (0.781) > pH (0.611) > Cl- concentration (0.366 ) > Mg2+ concentration (0.211) > Ca2+ concentration (0.079) > Na+ concentration (0.03). A chloride ion gas-solid phase distribution coefficient model ranging from 180 °C to 380 °C was built based on phase equilibrium theory and state equations. The study clarifies the gas phase transformation mechanism of chloride ions, and achieves the quantification and prediction of chloride ion volatilization under different environmental and water quality parameters; an important theoretical and practical reference for the application of high temperature flue gas evaporation technology is provided through the research.
ABSTRACT
AIM: To establish a method for the determination of Astragaloside Ⅳ in Oiluyishen Tabletes(Radix Astragali, Herba Pyrolae, Rhizoma Atractylodis Macrocephalae, Poria, Radix Codonopsis,etc.) by HPLC-ELSD. METHODS: Chromatography was performed on a 5?m HIQsilC 18 column(4.6mm?250mm) at 25℃. The mobile phase composition was acetonitrile-water(34∶66). The flow rate was at 1.0mL?min -1. An evaporation light-scattering detector (ELSD) was used as detector with gas flow rate of 2.6 mL?min -1 and drift tube temperature at 100℃. RESULTS: The linear range of Astragaloside Ⅳ was in the range of 2.288～ 22.88?g, r=0.999, the average recovery was 98.8% and RSD was 1.2%. CONCLUSION: This method is simple, feasible and reproducible. It can be used for the quality control of Oiluyishen Tabletes.
