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High efficient separation of olefin from fluid catalytic cracking naphtha: Separation mechanism and universal simulation method
Author(s) -
Zhang Yuhao,
Zhao Liang,
Chen Feng,
Wang Yongtao,
Gao Jinsen,
Cao Liyuan,
Wang Hui,
Xu Chunming
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17153
Subject(s) - naphtha , olefin fiber , thiophene , fluid catalytic cracking , toluene , gasoline , cracking , catalysis , chemistry , benzene , organic chemistry , solvent , chemical engineering , materials science , engineering
The fluid catalytic cracking (FCC) naphtha critical component‐oriented separation process is an efficient method to produce ultra‐low‐sulfur (<10 μg/g) gasoline with minimal loss of octane number (<1 RON). However, the product quality is highly dependent on the structure of the components of FCC naphtha. Aromatics and thiophene sulfides without a methyl side chain favor the separation of olefin. The major impulse of olefin separation is the solvent‐induced dipole of aromatics or thiophene sulfides, leading to a “Plane‐to‐Plane” combination between the solvent and aromatics or thiophene sulfides, accompanied by a steric hindrance due to their side chains. This condition resulted in 2–3 times greater θ of benzene and thiophene compared with that of toluene and 3‐methylthiophene. In addition, an improved non‐random two‐liquid model was proposed based on the above results, and a simulation method for FCC naphtha solvent extraction process was established. The calculation results accorded well with industry data.