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延迟焦化石油焦热重分析及热解动力学 预览 被引量:1

STUDY ON THE THERMOGRAVIMETRIC ANALYSIS AND PYROLYSIS KINETICS OF COKE FROM DELAYED COKING
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摘要 对延迟焦化石油焦在CO2和Ar两种气氛下,从室温至1000℃进行热重分析,探讨其热解机理。研究表明:延迟焦化石油焦热解过程首先经历50~100℃的脱水阶段,较明显的失重从400℃开始,在620~640℃失重速率达到峰值,这是石油焦中有机物侧链裂解释放挥发分的标志;800℃之后热失重速率不断增加,表明发生了快速热分解反应。以三级化学反应模型模拟热解过程,在433~904℃的热解温度范围内,CO2气氛下的平均活化能为29.70~44.81kJ/mol,Ar气氛下的平均活化能为57.68~69.44kJ/mol。 Pyrolysis of coke from delayed coking was performed by thermogravimetric analysis (TGA) in argon and carbon dioxide atmosphere from room temperature to 1 000℃ respectively. The mechanism of pyrolysis was discussed. TGA results showed that during the pyrolysis of coke dehydration happened at 50-100℃ then significant weight loss started from 400℃ and reached a maximum value around 620--640℃, which is commonly attributed to the release of volatile matter due to the rupture of side chains from organic compounds; above 800℃, weight loss increased remarkably, indicating rapid pyrolysis occurred. The average activation energy was determined using a third-order chemical reaction model to simulate the pyrolysis of coke from delayed coking. In the temperature range of 433--904℃, the average activation energy under CO2 and Ar atmosphere was 29.70-44.81 kJ/mol and 57.68-69.44kJ/mol,respectively.
作者 毛磊 童仕唐 Mao Lei,Tong Shitang (College of Chemical Engineering and Technology ,Wuhan University of Science and Technology ;Wuhan 430081)
出处 《石油炼制与化工》 CAS CSCD 北大核心 2011年第12期 46-49,共4页 Petroleum Processing and Petrochemicals
关键词 延迟焦化 石油焦 热重分析 热解 动力学 delayed coking petroleum coke thermogravimetry pyrolysis kinetics
作者简介 毛磊,女,副教授,在职博士生,主要从事化工分离工程与化工环保的研究工作。
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