In order to understand the distribution characteristics of water content in the process of silica gel adsorption and dehydration,the influence of desorption temperature on the adsorption capacity and phase structure of silica gel was studied.The effects of desorption atmosphere,desorption temperature,desorption time,water content,and desorption times on the effective residual water of silica gel were stud-ied.The effective adsorption water of silica gel under different desorption conditions was calculated.The results showed that when the desorption temperature was not greater than 130 ℃,the adsorption capacity did not decay and the structure remained stable.The effective residual water of silica gel is related to the desorption temperature and atmosphere,but not to the pre desorption water content and desorption times.When desorbing in an air atmosphere,the optimal desorption condition is 130 ℃,1 h,and the effective residual water is 8.5％～9.1％.When adsorbed for 20～150 min,the effective adsorbed water increases linearly with adsorption time,especially when adsorbed for 120～150 min,the effective adsorbed water reaches 12％～14％.
关键词
硅胶/脱附/温度/有效残留水/有效吸附水
Key words
silica gel/desorption/temperature/effective residual water/effective water adsorption
维普
万方数据