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天然(-)枞酸的含量占中国脂松香的40%左右,通过绿色制备工艺得到的(-)枞酸产物纯度达到99%以上,其得率在80%以上。使用GC-MS测定了松香树脂酸在大孔强酸性阳离子交换树脂催化下,异构重排反应生成(-)枞酸的反应动力学,结果符合一级反应方程,动力学方程:长叶松酸为lnca=-1.657×10-2t+3.352,反应速率常数1.657×10-2t-1;新枞酸为lnca=-1.385×10-2t+2.793,反应速率常数1.385×10-2t-1。
The content of natural (-) abietic acid accounts for about 40% of that of Chinese gum rosin. The purity of (-) abietic acid obtained by green preparation technology is over 99%, and its yield is over 80%. The kinetics of the formation of (-) abietic acid by isomeric rearrangement catalyzed by the macroporous strongly acidic cation exchange resin was determined by GC-MS. The results were in accordance with the first-order reaction equation. The kinetic equation was: The acid was lnca = -1.657 × 10-2t + 3.352, the reaction rate constant was 1.657 × 10-2t-1, the new abietic acid was lnca = -1.385 × 10-2t + 2.793, and the reaction rate constant was 1.385 × 10-2t-1.