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Study on the Adaptability of Alkanolamide ( LDEA ) Lowering Oil/Water Interfacial Tension to Different Crude Oils
Author(s) -
Pu Di,
Xiong Yachun,
Feng Rusen,
Guo Yongjun,
Lin Ling,
Xu Chengjun,
Yu Wenke
Publication year - 2020
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12430
Subject(s) - chemistry , surface tension , adaptability , alkali metal , chromatography , phase (matter) , chemical engineering , organic chemistry , thermodynamics , biology , ecology , physics , engineering
In order to investigate the high interfacial activity and fair oil phase adaptability of alkanolamide, “1:1” type lauric acid diethanolamide impurities (LDEA) were synthesized and purified by the column chromatography method to obtain dodecanoic acid diethanolamide (C 12 DEA), ester mixture, etc. The exact structures of these compounds were further confirmed by IR, gas chromatogrph with mass spectroscopy (GC–MS), and NMR. The influence of each component on the interfacial tension of oil/water (IFT) was studied by systematic quantitative analysis. The results showed that (i) the strength of each system to reduce oil/water IFT is C 12 DEA /DEA ≈ LDEA > C 12 DEA/DEA/ESTER > C 12 DEA/NaOH > C 12 DEA > C 12 DEA/ESTER > DEA. This indicates that LDEA contributes to the reduction of the oil/water IFT and the enhanced adaptability of crude oil in this order: DEA > > ESTER; (ii) when the IFT of the LDEA/DEA system reached an ultralow value, the minimum content of DEA in the system was 1%, and the maximum ester content was less than 5% when the LDEA/DEA/ESTER system reached the ultralow IFT; (iii) the possible mechanism of effect of LDEA components on the IFT and oil phase adaptability was proposed as the synergistic process among the hydrogen bonding, alkali effect, and interface self‐assembly of molecules in the interfacial layer. The contribution of these three factors were hydrogen bonding > alkali effect > interface self‐assembly.