氯代苯甲醚类致嗅物的生成机理及影响因素

Formation Mechanism and Influence Factors of Taste and Odour Compounds—Chloroanisoles

摘要:

以苯甲醚作为前体物，探讨氯代苯甲醚的生成途径机理以及在氯消毒过程中pH值、氯投加量（氯的质量浓度）、苯甲醚初始质量浓度、温度和金属离子对生成的影响.结果表明，pH值对反应起决定性的作用，苯甲醚只能在酸性和弱酸性条件下才能发生氯代反应.氯投加量、苯甲醚初始质量浓度、温度的升高不仅加快了苯甲醚的反应速率，也增大了氯代苯甲醚的生成量.金属离子Fe3+，Al3+对反应有催化作用，Al3+的促进效果最好，反应速率提高约25%，而Mn2+，Zn2+对反应没有促进作用.氯投加量、苯甲醚初始质量浓度、温度3个因素的影响对反应体系的影响强度不同，分别和生成量呈线性相关.氯代苯甲醚的生成量和3个影响变量之间符合多元线性相关，氯投加量和苯甲醚初始质量浓度对氯代苯甲醚的生成量影响显著，二者的显著性小于0.05，温度对反应的显著性不明显.三者对反应的影响强度由大到小为氯投加量、苯甲醚初始质量浓度、温度.

Abstract:

Based on anisole as a precursor, the formation pathway mechanism and different influence factors such as pH value， chlorine dosage (the concentration of chlorine), initial concentration of anisole, temperature and some metal ions were investigated. The results show that pH value is the most important factor in the reaction. Chloroanisoles can be formed only under the acid and weak acid conditions. The formation velocity is accelerated and the concentration increases with increasing of chlorine dosage， initial concentration of anisole and temperature. Fe3+， Al3+ are benefit to the reaction while Mn2+， Zn2+ are not. The reaction rate is increased by 25% with the condition of Al3+. The influencing intensities of chlorine dosage， initial concentration of anisole，temperature are different. The relationship between concentration of products and the three factors (chlorine dosage， initial concentration of anisole， temperature) is linear correlation, respectively and chlorine dosage， initial concentration of anisole affect the concentration of products most obviously. The significances of them are both less than 0.05 while temperature is not. The sequence of effect of chloroanisoles formation is chlorine dosage， initial concentration of anisole， temperature.