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Separation of Monoester and Diester in the Esterification Product of Polyethylene Glycol and Acrylic Acid by the Weibull Method
Author(s) -
Lei JiaHeng,
Li Hui,
Zhang AnFu,
Du XiaoDi,
Lu Qian
Publication year - 2012
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 - 10.1007/s11743-011-1267-2
Subject(s) - chemistry , polyethylene glycol , partition coefficient , aqueous solution , chromatography , extraction (chemistry) , ethyl acrylate , ethyl acetate , acrylate , acrylic acid , ethylene glycol , polypropylene glycol , polymer chemistry , organic chemistry , polymer , copolymer
In the extraction system of ethyl acetate and NaCl aqueous solution, partition coefficients of polyethylene glycol mono‐acrylate (PEGmA) and polyethylene glycol di‐acrylate (PEGdA) varied with temperature and concentration of NaCl solution were studied. The best separation condition of PEGmA and PEGdA was determined on that basis. Results of the testing showed that partition coefficients of PEGmA and PEGdA sharply increased with rising concentration of NaCl solution and temperature. Since the incremental degrees of PEGmA and PEGdA were different from each other, the ratio of partition coefficient ( K PEGdA / K PEGmA ) reached a maximum under the conditions of 20 °C and 5 mol L −1 NaCl. The best separating condition was as follows: PEGdA was extracted out with ethyl acetate by adding 5 mol L −1 NaCl at 20 °C. After three repetitions, the recovery rate of PEGdA reached 99.8%. The water phase was heated to 50 °C and PEGmA was extracted out with ethyl acetate. The recovery rate of PEGmA amounted to 68.8% by three repetitions. After washing and drying, the purity of PEGmA and PEGdA was 99.7 and 98.7% respectively.