CATEGORY: GAS OIL
Energy Fuels, 2013, 27 (2), pp 654–665, DOI:
10.1021/ef3017442, Publication Date (Web): January 24, 2013
Synergistic
Process for Coker Gas Oil Catalytic Cracking and Gasoline Reformation
Jinhong Zhang †, Honghong Shan †, Wenjing Liu †, Xiaobo Chen †,
Chunyi Li *†, and Chaohe Yang *†
† State Key Laboratory of Heavy Oil Processing, China University of Petroleum,
Qingdao 266555, China
yangch@upc.edu.cn
chyli@upc.edu.cn
Abstract
A
critical problem in processing coker gas oil (CGO) is its high nitrogen
content, especially the basic nitrogen compounds. This limits its cracking performance in the
fluid catalytic cracking (FCC) process. Three processing schemes for enhancing
the conversion of CGO were evaluated in a pilot-scale riser FCC unit .
Four indexes, including thermal cracking index, dehydrogenation
index, hydrogen transfer coefficient, and isomerization reaction index, were
used to study the effects of operating conditions on the reactions of CGO
cracking. Results reveal that the optimal operating conditions for CGO cracking
are high reaction temperature and large catalyst-to-oil ratio with a short
residence time. Accordingly, authors
suggest a synergistic process by selectively recycling light FCC gasoline (LCG)
from the upper position of the riser reactor.
This can provide a high-severity reaction zone for CGO cracking and a
low-severity reaction zone for gasoline upgrading. To ensure the optimal
recycle ratio and improve the gasoline quality, a two-stage synergistic (TSS)
process was proposed. The simulated experiments of the TSS process show that
the higher conversion and more desired products can be achieved, even though
under a high processing ratio of CGO to conventional feeds.
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