TG-DTG与TG-FTIR-GC/MS联用研究鸡粪热解动力学和挥发性产物  

Study on Pyrolysis Kinetics and Volatile Products of Chicken Manure by TG-DTG and TG-FTIR-GC/MS

作　　者：陈思羽 莫海溶 陈倩沂 梁杰珍 陈小鹏 王琳琳 CHEN Si-yu;MO Hai-rong;CHEN Qian-yi;LIANG Jie-zhen;CHEN Xiao-peng;WANG Lin-lin(Guangxi Key Laboratory of Petrochemical Resources Processing and Process Intensification Technology,College of Chemistry and Chemical Engineering,Guangxi University,Nanning Guangxi 530004,China)

机构地区：[1]广西大学化学化工学院,广西石化资源加工及过程强化技术重点实验室,广西南宁530004

出　　处：《当代化工》2023年第9期2022-2029,共8页Contemporary Chemical Industry

基　　金：国家自然科学基金(No.32160349);广西石化资源加工及过程强化技术重点实验室主任课题基金项目(项目编号:2022Z002);自治区级大学生创新创业训练计划项目(项目编号:202110593196)。

摘　　要：采用热重-微分热重分析(TG-DTG)研究广西3个不同产地上林县(SCM)、柳城县(LCM)和南宁市(NCM)鸡粪的热解动力学与热解机理;应用热重-红外-气质联用技术(TG-FTIR-GC/MS)动态跟踪鸡粪的热解过程,分析热解的挥发性产物。结果表明:不同产地的鸡粪的热解反应均包括失水、预热解、有机质热解和碳酸盐热解4个阶段,同一产地鸡粪在不同升温速率的热解反应变化规律一致,随着升温速率增加,特征温度和最大失重速率向高温区移动。采用Kissinger法得到SCM、LCM与NCM的热解活化能Ea分别为106.40、161.11、146.55k J·mol^(-1);结合Coats-Redfern法确定了不同产地鸡粪的热解机理函数。鸡粪热解挥发性产物为CO_(2)、CH4、醛、酮、酸、酯、不饱和脂肪烃和芳香烃化合物;最大失重速率下GC/MS检测所得挥发性产物主要为左旋葡聚糖(25.84%)、4-乙烯基愈创木酚(5.63%)、硬脂酸(4.40%)、2,2-二甲基-4-己烯-3-酮(4.29%)等化合物,可见鸡粪热解产生了具有能源化与资源化应用前景的化合物。The pyrolysis kinetics and mechanism of chicken manure from Shanglin County(SCM),Liucheng County(LCM)and Nanning City(NCM)were studied by thermogravimetric-differential thermogravimetric analysis(TG-DTG).TG-FTIR-GC/MS was used to dynamically track the pyrolysis process of chicken manure and analyze the volatile products of pyrolysis.The results showed that the pyrolysis reaction of chicken manure from different producing areas included four stages:dehydration,pre-pyrolysis,organic matter pyrolysis and carbonate pyrolysis.The pyrolysis reaction of chicken manure from the same producing area at different heating rates was consistent.With the increase of heating rate,the characteristic temperature and the maximum weight loss rate moved to the high temperature zone.The pyrolysis activation energy Ea of SCM,LCM and NCM was 106.40 kJ·mol^(-1),161.11 kJ·mol^(-1)and 146.55 kJ·mol^(-1),respectively.The pyrolysis mechanism function of chicken manure from different producing areas was determined by Coats-Redfern method.The volatile products of chicken manure pyrolysis were CO_(2),CH_(4),aldehydes,ketones,acids,esters,unsaturated aliphatic hydrocarbons and aromatic hydrocarbons.The volatile products detected by GC/MS at the maximum weight loss rate were mainly levoglucosan(26.98%),2-methoxy-4-vinylphenol(5.63%),octadecanoic acid(4.40%),2,2-dimethyl-4-hexen-3-one(4.29%)and other compounds.It was seen that chicken manure pyrolysis produced compounds with energy and resource application prospects.

关 键 词：鸡粪 热解动力学 热重-微分热重分析 热重-红外-气质联用分析 挥发性产物 

分 类 号：X705[环境科学与工程—环境工程] X731