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H 2 SO 4 ‐catalyzed isobutane alkylation under low temperatures promoted by long‐alkyl‐chain surfactant additives
Author(s) -
Zheng Weizhong,
Wang Zhen,
Sun Weizhen,
Zhao Ling,
Qian Feng
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.17349
Subject(s) - alkylation , pulmonary surfactant , isobutane , chemistry , alkyl , cationic polymerization , selectivity , catalysis , hydrocarbon , octane , surface tension , miscibility , dispersion (optics) , bromide , organic chemistry , inorganic chemistry , polymer chemistry , polymer , biochemistry , physics , optics , quantum mechanics
To deeply understand the role of surfactants on the acid/C4 hydrocarbon miscibility, the catalytic activity and molecular‐level interfacial properties of long‐alkyl‐chain cationic surfactants (hexadecyltrimethylammonium bromide, CATB and dihexadecyldimethylammoniumchloride, DDAB) and anionic one (sodium dodecyl benzene sulfonate, SDBS) were studied as additives for H 2 SO 4 alkylation using experiments and molecular dynamics simulations. Surfactant additives are found to efficiently decrease by‐products and promote higher selectivity of trimethylpentanes (TMPs) and higher research octane number (RON), which is attributed to the improvement of acid/hydrocarbons interface, including better interfacial dispersion, higher I/O ratio, and lower interfacial tension. Surfactant additives show an interfacial intensification, quite different from intrinsic reaction intensification by low temperature. Combination of SDBS additive and lower temperature contributes to significantly higher TMP selectivity and higher RON up to 84.20 wt% and 99.07 at 269.2 K from 60.21 wt% and 94.34 at 281.2 K, respectively. The information provides good reference for the industrial H 2 SO 4 alkylation.