Synthesis,Characterization and Exploratory Application of Anionic Surfactant Fatty Acid Methyl Ester Sulfonate from Waste Cooking Oil |
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| Authors: | Yueming Jin Senlin Tian Jiali Guo Xiao Ren Xinyan Li Shumei Gao |
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| Affiliation: | 1.Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming,China |
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| Abstract: | The environmentally friendly anionic surfactant fatty acid methyl ester sulfonate (MES) was prepared by esterification of waste cooking oil (WCO), a low-cost raw material, followed by sulfonation with chlorosulfonic acid. MES production from WCO (W-MES) gave yields up to 78 %. Such a value is only slightly lower than the one obtained from soybean oil (S-MES), 82 %, and almost the same as that from reused cooking oil (R-MES), 76 %. According to the two-phase titration results, the content of the active component, α-MES, in S-MES, R-MES and W-MES was equal to 76.82, 69.19 and 66.60 %, respectively. The disalt, RCH(CO2Na)SO3Na, contents were instead 3.2, 3.8 and 4.7 %, respectively. As proved by the results of the FTIR and NMR characterizations, the chemical structure of W-MES is almost the same as that of S-MES and R-MES. The critical micelle concentration of W-MES is 5.38 mmol/L and the corresponding surface tension is 32.3 mN/m. The hydrophile-lipophile balance value of W-MES is 12.33, which indicates that it can form oil/water emulsions. The three MES demonstrated the same adsorption efficiency, yielding a pC20 value of 3.22, and similar foam stability. Their detergency can be up to 75 % at a concentration of 400 mg/kg and the tolerance to Ca2+ is higher than the one exhibited by linear alkylbenzene sulphonic acid and alpha olefin sulfonate. Additionally, W-MES shows a considerable solubilization capacity towards polycyclic aromatic hydrocarbon as the molar solubilization ratios to pyrene, phenanthrene and acenaphthene in a 30 mmol/L solution are 1.22 × 10?3, 2.67 × 10?3 and 3.81 × 10?3, respectively. |
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| Keywords: | Waste cooking oil Fatty acid methyl ester sulfonate Anionic surfactant Chlorosulfonic acid Esterification Sulfonation |
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