木质素磺酸盐的化学结构与热解特性  被引量:11

Chemical Structure and Thermochemical Property of Lignin Sulfonate

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作  者:李计彪[1] 武书彬[1] 徐绍华[1] 

机构地区:[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出  处:《林产化学与工业》2014年第2期23-28,共6页Chemistry and Industry of Forest Products

基  金:国家自然科学基金资助项目(31270638);国家重大基础研究课题(2013CB228101)

摘  要:以木质素磺酸钙( Ca-Ls)为原料,运用元素分析、傅里叶变换红外光谱( FT-IR)手段对其化学结构和性能进行表征,利用热重分析法( TG)和热解-气相色谱/质谱联用( Py-GC/MS)技术研究木质素磺酸钙的热裂解特性。研究发现:木质素磺酸盐相对于草本类木质素具有较低的碳含量及氮含量,较高的硫含量;木质素磺酸钙含有较丰富的愈创木基(G型)与紫丁香基(S型)结构单元;木质素磺酸钙热解分为4个阶段,主要热解温度范围为150-450℃;升温速率为10、20、30℃/min时,热失重微分曲线上最大失重峰向高温迁移,同时随着升温速率的增大,木质素磺酸钙热解时样品颗粒达到热降解所需温度的响应时间变短,木质素磺酸钙热分解速率增大,从而改变了木质素发生热降解反应的进程。Calcium lignosulfonate ( Ca-Ls ) was selected as the raw material. Its chemical structure and property were characterized by means of elemental analysis and Fourier transform infrared spectroscopy ( FT-IR) . The pyrolysis characteristics were also analyzed by thermal gravimetric analysis ( TG ) and pyrolysis-gas chromatography combined with mass spectrometry (Py-GC/MS). The results showed that:1) Ca-Ls had a lower carbon and nitrogen content and higher sulfur content than lignin from herbal wood;2) Ca-Ls contained rich guaiacyl (G-type) and syringyl (S-type) structure unit;3) the pyrolysis of Ca-Ls was divided into four stages, and the main pyrolysis temperature range was 150-450 ℃;4) when heating rate was 10, 20 and 30 ℃/min, the biggest weight loss peak on the DTG curves migrated to higher temperature, meanwhile, as the heating rate increased, the response time for sample particles to reach the desired pyrolysis temperature became shorter. Thus the thermal decomposition rate increased and the process of thermal decomposition of Ca-Ls was changed.

关 键 词:木质素磺酸钙 红外光谱 热重法 热解-气相色谱 质谱 

分 类 号:TQ35[化学工程]

 

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