Page 177 - 精细化工2019年第8期
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第 36 卷第 8 期                             精   细   化   工                                  Vol.36, No.8
             201 9 年 8 月                             FINE CHEMICALS                                 Aug.    2019


              水处理技术与环境保护
                         PDMDAAC 与一氯胺的反应动力学研究



                                                                                  *
                                                                     *
                                       邓   斌,奚一伦,贾   旭 ,张跃军
                                        (南京理工大学  化工学院,江苏  南京    210094)


                 摘要:以中国微污染原水的预氯氧化和复合混凝剂强化混凝过程条件为背景,以聚二甲基二烯丙基氯化铵
                 (PDMDAAC)与一氯胺反应生成 N-二甲基亚硝胺(NDMA)的过程为对象,采用隔离法和初始浓度法,在
                 15~35  ℃间,研究了二者反应的初始阶段、PDMDAAC 开环降解反应过程的动力学。结果表明:对于 PDMDAAC
                 与一氯胺的反应,总反应级数均在 1.99 以上,接近于 2,对反应物一氯胺和 PDMDAAC 的反应级数均在 0.9971
                               2
                                                                   –5
                 以上;相关系数 R >0.9976。25  ℃时,反应速率常数为 1.23×10   L/(mol·h),在 15~35  ℃间反应活化能 E a 约为
                 44.22 kJ/mol。由此得到了 PDMDAAC 与一氯胺反应生成消毒副产物 NDMA 初始过程的动力学描述。
                 关键词:聚二甲基二烯丙基氯化铵;一氯胺;强化混凝;消毒副产物;反应动力学;水处理技术
                 中图分类号:O643.1      文献标识码:A      文章编号:1003-5214 (2019) 08-1665-07


                             Kinetics of N-Nitrosodimethylamine Formation from

                                        PDMDAAC with Monochloramine

                                                                 *
                                                                                  *
                                      DENG Bin, XI Yi-lun, JIA Xu , ZHANG Yue-jun
                  (School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China)

                 Abstract:  The  prechlorination  of  tiny-polluted  raw  water  in  China  and  the  conditions  of  coagulation
                 strengthening  by  composite  coagulants  were  taken  as  the  background.  The  reaction  of  poly
                 (dimethyldiallylammonium) chloride (PDMDAAC) with monochloramine to generate N-nitrosodimethylamine
                 (NDMA)  was  taken  as  the  research  object.  The  reaction  kinetics  of  initial  degradation  process  of
                 monochloramine with  PDMDAAC were studied by  means  of  initial  reactant  concentration  and  isolation
                 independently within the range of 15~35  ℃. The results showed that the general reaction order was more
                 than 1.99, close to 2, and the reaction order for both monochloramine and PDMDAAC was above 0.9971.
                                                                                               –5
                                           2
                 The coefficients of correlation R were more than 0.9976. The reaction rate constant was 1.23×10 L/(mol·h)
                 at 25  ℃.And the reactive activation energy E a was about 44.22 kJ/mol in the temperature range 15  ℃ to
                 35  ℃. Thus,  a kinetic description of  the initial  stage  reaction of  PDMDAAC with  monochloramine  to
                 form NDMA, a disinfection by-product was obtained.
                 Key  words:  PDMDAAC;  monochloramine;  enhanced  coagulation;  disinfection  by-product;  reaction
                 kinetics;water treatment


                 随着人类生活水平的提高和工业活动的增加,                          合具有更好的处理效果。聚二甲基二烯丙基氯化
            地表水受污染的程度和范围不断增加。对于微污染                             铵( Polydimethyldiallylammonium  chloride,简 称
            原水,采用常规水处理方法的出水水质往往不能达                             PDMDAAC)因其无毒且有电中和、吸附架桥作用,
            标。近十余年来发现,包括预氯氧化、强化混凝处                             在原水强化混凝处理中可与无机盐混凝剂复配成稳
            理工艺在内的各种强化处理工艺(前处理、深度                              定型复合混凝剂,在不改变现有水处理工艺的前提
            处理)技术,可以增强常规水处理功效,两者结                              下,显著提高了微污染原水的处理功效,改善出水

                 收稿日期:2018-12-08;  定用日期:2019-04-11; DOI: 10.13550/j.jxhg.20180897
                 基金项目:国家自然科学基金项目(21377054,51503100)
                 作者简介:邓   斌(1993—),男,硕士研究生,E-mail:njust_dengbin@163.com。联系人:贾   旭(1982—),女,副教授,E-mail:
                 jiaxu@njust.edu.cn;张跃军(1959—),男,教授,E-mail:zhyuejun@njust.edu.cn。
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