详细信息
正庚烷和正辛烷在无黏结剂5A分子筛上的吸附动力学特性
ADSORPTION KINETICS OF n-HEPTANE AND n-OCTANE ON BINDER-FREE 5A MOLECULAR SIEVE
文献类型:期刊文献
中文题名:正庚烷和正辛烷在无黏结剂5A分子筛上的吸附动力学特性
英文题名:ADSORPTION KINETICS OF n-HEPTANE AND n-OCTANE ON BINDER-FREE 5A MOLECULAR SIEVE
作者:孙辉[1];沈本贤[1]
机构:[1]华东理工大学化学工程联合国家重点实验室,上海200237
年份:2011
卷号:42
期号:1
起止页码:15
中文期刊名:石油炼制与化工
外文期刊名:Petroleum Processing and Petrochemicals
收录:CSTPCD;;Scopus;北大核心:【北大核心2008】;CSCD:【CSCD_E2011_2012】;
语种:中文
中文关键词:正庚烷;正辛烷;5A分子筛;吸附动力学
外文关键词:n-heptane; n-octane; 5A molecular sieve; adsorption kinetics
摘要:采用重量法研究正庚烷和正辛烷在无黏结剂和有黏结剂5A分子筛上的吸附动力学,采用简化的扩散模型计算扩散系数,并估算扩散活化能。结果表明,正构烷烃在无黏结剂5A分子筛颗粒上的扩散时间常数大于有黏结剂的5A分子筛,黏结剂的存在降低了正构烷烃在5A分子筛上的扩散速率。在吸附温度为300~480 K的条件下,正庚烷和正辛烷在无黏结剂5A分子筛上的微孔扩散系数分别为(20.84~85.77)×10^(-14)、(3.80~23.44)×10^(-14)cm^2/s,在有黏结剂5A分子筛上的大孔扩散系数分别为(4.87~38.58)×10^(17)、(4.28~14.65)×10^(-7)cm^2/s。正庚烷和正辛烷在无黏结剂5A分子筛上的扩散活化能分别为10.74、12.71 kJ/mol,在有黏结剂分子筛上的扩散活化能分别为14.16、16.35 kJ/mol。
Adsorption kinetics of n-heptane and n-octane on 5A molecular sieve pellets with/without binder was studied using gravimetric method. Diffusivities were derived from the simplified model and diffusion activa tion energies were evaluated. Results show that the diffusion time constants of n-paraffins on binder-free pellets are larger than those of adsorbates on pellets with binder. In the temperatures range of 300--480 K, the micropore diffusivities of n-heptane and n-octane on binder-free pellets are (20. 84--85. 77) × 10^-14 and (3. 80- 23.44) × 10^-14 cm^2/s, respectively; the macropore diffusivities of n-heptane and n-octane on pellets with binder are (4.87 38.58) × 10^-7 and (4.28-14. 65) × 10^- 7 cm^2/s, respectively. The diffusion activation energies of n-heptane and n-octane are 10.74 and 12. 71 kJ/mol on binder-free 5A molecular sieve respectively, 14.16 and 16.35 kJ/mol on 5A molecular sieve with binder respectively.
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