乳酸丙二醇酯的非水相酶催化合成及应用研究

Studies on Lipase-Catalyzed Synthesis of Propanediol Lactate in Non-aqueous Phase and its Application

DOI：

中文关键词: 乳酸丙二醇酯 非水相 脂肪酶 保润 卷烟

英文关键词: propanediol lactate non-aqueous phase lipase humectant cigatette

基金项目:国家烟草专卖局科技项目(110200701004)

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中文摘要:

以乳酸和丙二醇为原料,以一种固定化的假丝酵母脂肪酶为催化剂,催化合成了乳酸丙二醇酯,并对比了乳酸、丙二醇和乳酸丙二醇酯的保湿性和吸水性。研究确定的最优反应条件为:50 mL正己烷为溶剂,初始乳酸浓度为0 mol/L,丙二醇浓度为0.4 mol/L,加入固定化脂肪酶0.2 g,ZGS高效耐酸分子筛添加量2.0 g,反应温度50℃,以0.01 mol/(L.h)的速度滴加脱水乳酸20 h,搅拌催化反应,反应64 h结束,乳酸转化为乳酸丙二醇酯的酯化率达到97.3%。反应后纯化得到的产品质谱分析和红外光谱分析结果证实为乳酸丙二醇酯,GC质量分数达到99%以上。乳酸丙二醇酯的保湿性和吸水性试验表明:在相同的温度和湿度条件下,乳酸丙二醇酯的保湿效果比乳酸和丙二醇好,吸水性与丙二醇相当。乳酸丙二醇酯应用到卷烟中,可增加烟气舒适度,降低烟气干燥感。

英文摘要:

The study synthesized a propanediol lactate with lactic acid and propylene glycol as substrate and catalyst by an immobilized Candida rugosa lipase.as catalyst and compared the moisture absorption and water absorption of lactic acid、propylene glycol and propanediol lactate.The optimum reaction conditions were determined and listed as follows: The reaction was stirred at 50 ℃ with hexane as solvent,0 g/L initial lactic acid concentration and then feed at 0.01mol/L for 20 h,0.4 mol/L propylene glycol concentration,0.2 g/L immobilized lipase,2.0 g/L molecular sieve,and the reaction time is 60 h.With this optimum conditions,the conversion percent of lactic acid to propanediol lactate was achieved at 97.3%.The purified product after reaction was proved as propanediol lactate by MS and infrared spectrum analysis which content was above 99%.Then the moisture absorption and water absorption of lactic acid,propylene glycol and propanediol lactate were compared and the results shown that the effect of moisture absorption of propanediol lactate was better than that of lactic acid and propylene glycol,respectively.The effect of water absorption was the same as that of propylene glycol in the same temperature and humidity condition.Propanediol lactate was used as cigarette additive.The smoke was comfortable and the dry sensation was reduced.

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