对超声作用下声强、超声作用时间、温度、催化剂用量、反应时间对亚油酸共轭反应产率的影响进行了研究,在此基础上,通过均匀设计,建立了各因素对产率影响的数学模型,并采用紫外光谱与红外光谱对产物进行了表征。结果显示:声强、超声作用时间、反应总时间、催化剂用量、温度等都对共轭反应产率有重要影响;均匀试验结果显示,在22.17～27.26 W/cm2内,与其他因素相比,声强的影响不显著;如试验温度高、时间长、催化剂用量大,则最终产率高。在实际生产中,可以运用回归模型,选择适宜的参数,以得到满足要求的产品。对比试验显示,在其他条件相同时,超声处理可以提高产率,而达同样的产率,超声处理则可以使反应的催化剂用量减少,反应时间缩短。光谱表征显示,亚油酸已发生共轭反应,且产物以顺反式构型为主。

The effects of ultrasonic intensity,ultrasonic time,temperature,usage of catalyst and reaction time on the yield of conjugated linoleic acid were studied.The mathematic model of these factors to the yield was also established through uniform design.The product was characterized by ultraviolet spectroscopy and infrared spectroscopy.The results show that the factors of ultrasonic intensity,ultrasonic time,temperature,usage of catalyst and reaction time are all important to the yield of conjugated linoleic acid.Uniform experiments indicate that comparing with other factors,the ultrasonic intensity,in the range of 22.17~27.26 W/cm~2,doesn't play an important role in the reaction.Under the conditions of the experiments,the higher the temperature,the longer the reaction time and the more usage of catalyst,will yield higher production.To obtain desirable product,the mathematic model can be used in reality to select proper parameters.In comparison with the normal method,the process assisted by ultrasound can achieve higher yield under the same conditions;it can also reduce catalyst usage and shorten reaction time with the same yield.Spectrum analysis shows that the conjugation is reacted and the cis-trans configuration is the primary products.