Tang Xu
2003
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Journal
Journal of Qingdao University of Science and Technology
Abstract
Sodium 5 Sulfoisophthalic acid dimethyl ester(SIPM) was synthesized from isophthalic acid (IPA) and 50 % oleum. The optimal reaction conditions were determined by orthogonal design method.In sulfonation reaction, the ratio of IPA to SO 3 mol was 1∶1.1,the reaction temperature was 185 ℃ and reaction time was 5h; In esterfication reaction, the ratio of IPA to CH 3OH(mol) was 1∶6, the reaction temperature was 76 ℃ and reaction time was 5h;In neutralization reaction, the reaction temperature was 25 ℃ and the ratio of IPA to mother liquor(mass) was 1∶8. The total yield and purity of the product reached 78.7 % and 99.5 %, respectively.