Study On The Synthesis Of Isosorbide And Its Application In Terephthalic Acid Copolyesters

This paper improved the experiment of the dehydration of sorbitol to isosorbide,and explore the reaction conditions in detail, and obtained the optimum reactionconditions: Sorbitol: Catalyst=1000:1, reaction time of2h,and reaction temperatureof140℃. We synthesized a novel efficient catalyst and used it to catalyze sorbitoldehydration to isosorbide, and prepared high purity and high yield isosorbide. Weconducted amplify tests of3kg level, and industrial middle-level experiment of1ton,and achieved good results. We conducted1HNMR,13CNMR, GC-MS to characterizethe product.In this paper, we used isosorbide copolymerize with terephthalic acid and1,3-propanediol, and discussed the polymerization process of two kinds of polyesterwhich contents of isosorbide were16.7%and32.8%and screen catalysts.Wesynthesize and characterize two effective catalysts,1,3-propanediol antimony and1,3-propanediol titanium, and conducted1HNMR, TG thermal analysis and intrinsicviscosity analysis to the polyesters, and made a preliminary evaluation to the structureand properties of isosorbide and polyesters.We explored the synthesis route of isosorbide, which had some advantages suchas high yield, high purity, and low-cost of synthetic catalyst, and high catalyticefficiency and so on; Synthetic routes and equipment is simple and more suitable forlarge-scale industrial production. The terephthalic acid copolyester containedisosorbide may be one potential alternative to PTT fibers.