Fouling by Asphaltenes After and During Conversion

Developed by: AIChE
  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    March 23, 2010
  • Skill Level:
  • PDHs:

Share This Post:

Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.

During resid conversion processes, such as visbreaking or hydroconversion, more saturated pendant groups are cracked off asphaltenes, making them less soluble. Meanwhile, the more saturated volatile liquids formed during the conversion are often nonsolvents for asphaltenes. As a result, these converted asphaltenes often become insoluble when the reaction product is cooled to form sediments and foul heat exchangers. Therefore, distilling out the volatile liquids from the heavy product reduces the hot filtration sediment even though the concentration of converted asphaltenes is increased. The removal of nonsolvent allows more converted asphaltenes to dissolve. On the other hand, if the asphaltenes become insoluble during conversion, they form a liquid crystalline form of coke, the carbonaceous mesophase, inside the reactor. Usually, the most effective method to mitigate this form of coke formation is also to remove the nonsolvent by stripping out the volatile liquids from the conversion reactor.

This recording is FREE to members of the Fuels and Petrochemicals Division of AIChE. AIChE members may join the Division for only $10. Join F&PD now and return to this page with your new log-in and you will receive this presentation for FREE.
F&PD Members: Simply click on “click here to buy this archived webcast ” below and your ‘0’ price will appear in your shopping cart.



Do you already own this?

Log In for instructions on accessing this content.


AIChE Member Credits 0.5
AIChE Members $15.00
AIChE Fuels and Petrochemicals Division Members Free
AIChE Undergraduate Student Members Free
AIChE Graduate Student Members Free
Non-Members $25.00