熔融盐用于焦油模型化合物甲苯热转化的研究  

Study on the Thermal Conversion of Toluene as Tar Model Compound in Molten Salt

作　　者：袁泉 张乾[1] 崔丽萍[2] 向欣宁 郝泽光 黄伟[1] YUAN Quan;ZHANG Qian;CUI Liping;XIANG Xinning;HAO Zeguang;HUANG Wei(Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province,Taiyuan University of Technology,Taiyuan 030024,China;College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学煤科学与技术教育部与山西省重点实验室,太原030024 [2]太原理工大学化学化工学院,太原030024

出　　处：《太原理工大学学报》2021年第1期13-21,共9页Journal of Taiyuan University of Technology

基　　金：国家自然科学青年基金资助项目(21706175);山西省面上青年基金资助项目(201901D211049)。

摘　　要：熔融盐具有良好的热化学稳定性、较大的导热系数及较低的熔点,是一种非常有前景的裂解反应介质和催化剂。采用三元碱金属碳酸盐(Li2CO3-Na2CO3-K2CO3)体系,探究熔融盐催化甲苯裂解及水蒸气重整的反应规律,并对其产物进行分析。结果表明:甲苯高温裂解产生了H2、CH4、部分液相多环芳烃和积碳,且随着反应温度升高,甲苯转化率提高;熔融盐促进了甲苯甲基上的C—H键断裂,增加了气体和多环芳烃的产量,与无熔融盐热裂解相比甲苯转化率明显提高;水蒸气的引入改变了甲苯的热转化路径及产气组成,增加了小分子气体H2、CO、CO2的产量,减少了PAHs的生成,且可使积碳量明显降低;在熔融盐条件下,甲苯与水蒸气反应积碳量较无熔融盐中显著降低,气体产量则明显增加。Molten salt has good thermochemical stability,large thermal conductivity,and low melting point,and is believed as a promising reaction medium and catalyst.The present study investigated the cracking and steam reforming behavior of toluene in ternary eutectic carbonates(Li2CO3-Na2CO3-K2CO3),and analyzed the products.The results show that toluene cracking produces a lot of carbon,some liquid polycyclic aromatic hydrocarbons(PAHs),and gases such as CH4 and H2.And the conversion of toluene increases with temperature.The molten salt enhances the fracture of the C—H bond on methyl group,increasing the production of gases and PAHs.Water vapor alteres the thermochemical conversion pathway of toluene,and increases the production of H2,CO,and CO2,while reduces the production of PAHs.Water vapor can also eliminate some of carbon deposits and inhibit the graphitization of carbon deposits.The molten salt has catalytic effect on the thermochemical conversion of toluene with steam,which further reduces the amount of carbon deposits and increases gas yield.

关 键 词：熔融盐 焦油模型化合物 甲苯 水蒸气重整 热裂解 

分 类 号：TQ530.2[化学工程—煤化学工程]