摘要
吸附法在油气回收技术中运用很广泛.吸附剂的选择对吸附分离效果起到了决定性作用.选用3种商用活性炭,以正己烷和正庚烷为吸附质,在温度为293.15 K下进行了静态和动态吸附实验,并研究了活性炭孔结构对其吸附性能和吸附能的影响,同时利用Logistic模型的回归公式对活性炭的吸附穿透曲线进行拟合.结果表明,活性炭的比表面积和孔容是其吸附性能主要影响因素;正己烷和正庚烷的吸附行均符合Langmuir吸附等温模型;3种活性炭对正己烷和正庚烷的吸附能都随其比表面积变大而变大;Logistic模型拟合曲线与实验结果具有高度相似性,可用于活性炭吸附穿透曲线的预测.
Adsorption technology is widely used in oil vapor recovery, and adsorbents have decisive effect on separation. Three kinds of activated carbon （AC） were chosen to study their adsorption properties and adsorption energy, where n-hexane and n-heptane acted as adsorbate and adsorption experiments were conducted at 293. 15 K. At the same time, regression formula of Logistic model was used to fit the throughout curves of active carbons. The results showed that： surface area and pore volume of activated carbon were the main factors affecting its adsorption properties; the adsorption behavior of n-hexane and n-heptane were corresponding to Langmuir adsorption isotherm model; adsorption energy of these three kinds of activated carbon became greater with increasing specific surface area. Fitting curve of Logistic model had high similarity with the experimental results, which could be used in the prediction of breakthrough curves of activated carbons.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第12期4694-4700,共7页
Environmental Science
基金
江苏省高校自然科学研究重大项目(11KJA610002)
江苏省科技支撑计划(社会发展)项目(BE2011651)
关键词
活性炭
油气回收
吸附
吸附等温线
比表面积
孔容积
吸附温度
LOGISTIC模型
dynamic experiments
oil vapor recovery
adsorption
adsorption isotherm
specific surface area
total pore volume
adsorption temperature
Logistic model
