In this paper, the producing process of using V2O3 as raw material to obtain vanadium nitride was analyzed through the predominance area diagrams. The analysis shows that VN-phase can be accessed in the conversion process of V2O3 by controlling gas phase composition and temperature of the reaction system and the one-step method preparing for vanadium nitride is feasible. Effect of technical parameters on nitrogen content of products is investigated. The temperature of the reaction system has prominent influence on the nitrogen content of products, and the reaction is very sensitive to temperature. The quantities of nitrogen increase first and decrease later with increasing the reactive temperature, and the result researches the optimum at 1673K. The nitrogen content of the products tended to be constant after soaking over 2 hours at 1673K.Experimental observations shows that additives can increase the nitrogen content of VN. However, the effect of various additives on the nitrogen content is different. Among the additives referred in this paper, the effect of the iron powder, compounds of alkaline earths and NH4Cl are superior.
The enhancement of physical absorption of CO2 in the presence of second liquid phase (dispersed organic phase) was investigated due to many important industrial applications. Gas-liquid interfacial area, volumetric mass transfer coefficient and amplification factor were calculated and discussed using penetration model. The experimental results indicated that addition of the dispersed organic phase to water leads to the increase of volumetric mass transfer coefficient by 46%, 34%, 20% for heptanol, toluene and heptane respectively. The performed in this paper shows that addition of the dispersed organic phase to water increases gas-liquid interfacial area and reduces bubble diameter. These two effects play an essential role in the rate of carbon dioxide absorption increase. The effect of enhancement could be quantified by an amplification factor.
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