Use of NMR spectroscopy for structural characterization of off-shore Persian Gulf heavy oil asphaltenes

سال انتشار: 1390
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 554

فایل این مقاله در 9 صفحه با فرمت PDF قابل دریافت می باشد

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این مقاله:

شناسه ملی سند علمی:

ICHEC07_650

تاریخ نمایه سازی: 25 فروردین 1394

چکیده مقاله:

Depletion of the conventional crude oil resources have generated attentions towards crude oil reserves and processing them. Large content of asphaltenes as the main chemical characteristic of a heavy oil causes the industry to face technological challenges in all phases of the operation: reservoir, transportation, and refining. Due to the strategic and economic reasons in area of pipeline transportation for instance, different methods have become practicable such as dilution, heat treatment, emulsion formation, partial upgrading, core annular flow, … . Structural characteristics with focusing on the asphaltenes are basis for any improvements in these techniques or even developing new methods. The purpose of the present work was to use nuclear magnetic resonance spectroscopy (NMR) and scanning electron microscopy (SEM) to structurally study asphaltenes extracted from off-shore Persian Gulf heavy crude oil using n-pentane and n-heptane as light alkane precipitants. Two important structural parameters of the asphaltenes were determined namely, the aromaticity (fa) and the average number of carbon atoms per alkyl side chain (ncarbon) where fa for n-C5 asphaltenes was lower (0.39) than that obtained with n-C7 solvent (0.49), while ncarbon parameter values were 7.7 and 5.7 for n-C5 and n-C7 asphaltenes, respectively. images developed using Scanning Electron Microscopy (SEM) showed some released particles on the surface of the asphaltenes, which may be indicative of resins desorption. Furthermore Structural characterization of asphaltene from heavy crude oil is important in different sectors of the petroleum industry and may provide rough estimate for the challenging position of this source relative to other geographically distributed heavy oil resources.

نویسندگان

l Davarpanah

Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran

f Vahabzadeh

Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran

مراجع و منابع این مقاله:

لیست زیر مراجع و منابع استفاده شده در این مقاله را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود مقاله لینک شده اند :
  • Jeribi M, Almir-Assad B, Langevin D, Henaut I, Argillier JF. ...
  • Trejo F, Ancheyta J, Rana, MS, Structural Charac terization of ...
  • Perez -Hernandez R, Mendoz a-Anaya D, Mondragon- Galicia G, Espinosa ...
  • Xia L, Lu SH, Cao G, Stability and demulsific ation ...
  • Luo P, Wang X, Gu Y, Characteriz ation of asphaltenes ...
  • Leon O, Rogel E, Espidel J, Torres G, Asphaltene: structural ...
  • Miller JT, Fisher RB, Thiyagarajan P, Winans RE, Hunt JE, ...
  • Perez -Hernandez R, Mendo za-Anaya D, Mondragon- Galicia G, Espinosa ...
  • Clutter DR, Petrakis L, Stenger RL, Jensen RK, Nuclear magnetic ...
  • ASTM D2007-03, Standard test method for characteristic groups in rubber ...
  • McLean JD, Kilpatrick PK, Comparison of precipitation and extrography in ...
  • Trejo F, Centeno G, Ancheyta J, Precipitation, fractionation and charac ...
  • Ancheyta J, Centeno G, Trejo F, Marroquin G, Garcia JA, ...
  • Calemma V, Iwanski P, Nali M, Scotti R, Montanari L, ...
  • Shrokoff JW, Siddiqui MN, Ali MF, Characteriz ation of the ...
  • _ Internationt Chemical Engineering Congress & Exihibition Kish, Iran, 21-24 ...
  • نمایش کامل مراجع