Hydrolytic recycling of waste nylon 66 and its kinetic analysis

doi:10.16085/j.issn.1000-6613.2017-2371

Chemical Industry and Engineering Progress ›› 2018, Vol. 37 ›› Issue (08): 3238-3244.DOI: 10.16085/j.issn.1000-6613.2017-2371

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Hydrolytic recycling of waste nylon 66 and its kinetic analysis

HUANG Mei¹, SONG Xiuyan², LIU Fusheng¹, SONG Zhanqian¹

1 College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, China;
2 College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, China

Received:2017-11-16 Revised:2018-01-05 Online:2018-08-05 Published:2018-08-05

废尼龙66水解再资源化及其动力学分析

黄梅¹, 宋修艳², 刘福胜¹, 宋湛谦¹

1 青岛科技大学化工学院, 山东青岛 266042;
2 青岛科技大学化学与分子工程学院, 山东青岛 266042

通讯作者: 宋修艳,副教授,硕士生导师,研究方向为有机合成及环境友好催化技术研究。
作者简介:黄梅(1993-),女,硕士研究生,研究方向为精细化学品合成及废旧聚合物化学回用。
基金资助:
国家自然科学基金（51673106）及山东省科技攻关项目（2016GSF116005）。

Abstract

Abstract: The hydrolysis of nylon 66(PA66) was investigated by using sulfuric acid as a catalyst. The structures of the obtained products were characterized by FTIR and ¹H NMR. The results confirmed that these products are adipic acid (AC) and hexamethylene diamine (HMD),respectively. Using L₉(3⁴) orthogonal experiment,the effects of reaction temperature,reaction time,amount of catalyst and amount of water on the hydrolysis of PA66 were studied. The optimum reaction conditions were the molar ratio of PA66 to sulfuric acid is 1:2.5,the molar ratio of PA66 to methanol is 1:30,reaction temperature is 110℃,reaction time is 4h. Under these conditions,the conversion of PA66 was 100%. The molar yields of AC and HMD reached 98.06% and 97.15%,respectively. The kinetic experiment results showed that the hydrolysis of PA66 was a first-order reaction with an activation energy of 145.31kJ/mol. In addition,the hydrolysis mechanism under these conditions was discussed briefly.

Key words: nylon 66, hydrolysis, adipic acid, hexamethylene diamine, kinetics

摘要： 以硫酸为催化剂，对废尼龙66（PA66）水解反应进行了研究，采用红外光谱（FTIR）和核磁共振氢谱（¹H NMR）对产物结构进行了表征研究，并确认为己二酸（AC）和己二胺（HMD）。采用L₉（3⁴）正交实验方法，考察了反应温度、反应时间、催化剂用量及水用量等因素对水解反应结果的影响，并获得较佳的工艺条件：PA66和硫酸的摩尔比1∶2.5；PA66和甲醇的摩尔比1∶30；反应温度为110℃；反应时间为4h。在此工艺条件下，PA66转化率为100%，AC和HMD的摩尔收率分别达到98.06%和97.15%。动力学实验表明，PA66水解为一级反应，活化能为145.31kJ/mol。同时，对PA66在此条件下的水解反应机理进行了初步探讨。

关键词: 尼龙66, 水解, 己二酸, 己二胺, 动力学

CLC Number:

TQ342.12

HUANG Mei, SONG Xiuyan, LIU Fusheng, SONG Zhanqian. Hydrolytic recycling of waste nylon 66 and its kinetic analysis[J]. Chemical Industry and Engineering Progress, 2018, 37(08): 3238-3244.

黄梅, 宋修艳, 刘福胜, 宋湛谦. 废尼龙66水解再资源化及其动力学分析[J]. 化工进展, 2018, 37(08): 3238-3244.

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Hydrolytic recycling of waste nylon 66 and its kinetic analysis

废尼龙66水解再资源化及其动力学分析

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