改性疏水硅胶用于油气吸附解吸的研究

Investigation of modified hydrophobic silica gel for gasoline vapor adsorption and desorption

吸附法为油气回收的常用方法,对吸附剂的研究有着重要的意义。为了开发出高吸附量、高热稳定性和疏水性的油气回收专用硅胶,对常规硅胶的物理及化学改性方法进行了研究。通过分析热处理温度、热处理时间及升温速度等因素对改性硅胶吸附效果的影响,提出了汽油油气吸附率高、吸水率低的硅胶改性条件为:酒石酸改性剂,热处理温度550~650℃,热处理时间3~10 h,升温速度3~10℃/min。同时,研究了影响改性硅胶解吸效果的因素,结果表明,真空度越高,温度越高,解吸次数越多,改性硅胶的解吸率越高。

Adsorption method has been generally applied in oil vapor recovery,and it is important for this method to choose or develop high-performance adsorbents.Physical and chemical methods for the modification of a common silica gel were investigated to develop a new adsorbent of high adsorptive capacity,high thermal stability and high hydrophobic character,especially for gasoline vapor recovery.Three effect factors of temperature,time,and temperature increasing rate on the adsorption performance of the modified silica gel(MSG) were analyzed in the processes of heat treatment,and the results showed that the temperature of 550 ~ 650 ℃,the time of 3 ~ 10 h,and the rate of 3 ~ 10 ℃/min were the optimized modification conditions to increase the efficiency for gasoline vapor adsorption but decrease the efficiency for water vapor adsorption,accompanying with tartaric acid as the modifier.Meanwhile,the effect factors on the MSG's desorption performance were also measured and the results showed that the higher the vacuum degree and the temperature,the more the times,and the higher the desorption efficiency.