摘要
为深度解析石脑油催化裂解反应网络,基于结构导向集总方法建立石脑油催化裂解工艺的分子水平反应动力学模型,结合过渡态理论探索烃类分子的差异化裂解机理,制定31条反应规则用于描述石脑油催化裂解反应网络。通过模型计算不同工艺条件下的低碳烯烃分布,解析产品收率沿反应器高度的变化规律。研究表明:通过模型计算证实反应器初段的乙烯和丙烯收率占总收率的60%以上;通过反应条件敏感度曲线确定最优反应条件为温度680℃、停留时间2 s;反应路径竞争比例计算结果证实,反应温度高于675℃时热裂解机理占主导作用,催化裂解反应比例降低和缩聚反应比例增加是限制丙烯收率的主要因素。基于该模型成功实现了石脑油催化裂解反应网络的可视化开发与反应路径深度解析。
To deeply analyze the naphtha catalytic cracking reaction network,a molecular-level reaction kinetics model for naphtha catalytic cracking process was established based on the structure-oriented lumping method.The differential cracking mechanisms of hydrocarbon molecules were explored using the model in combination with transition state theory,and 31 reaction rules were formlated to describe the naphtha catalytic cracking reaction network.The model was used to calculate the distribution of light olefins under various process conditions,and analyze the variation law of product yields along the reactor height.Research shows that model calculation has confirmed that ethylene and propylene in the initial section of the reactor account for over 60%of the total yield;process sensitivity curves indicate the optimal reaction conditions as follows:680℃for reaction temperature and 2 s for residence time;the competition ratio of reaction pathways reveals that the thermal cracking mechanism plays a dominant role when the temperature exceeds 675℃,and the decrease in catalytic cracking reactions and the increase in condensation ractions are key factors limiting the propylene yield.The model enables the visualization development of naphtha catalytic cracking reaction network and in-depth analysis of reaction pathways.
作者
李泽
张鑫阳
杨满军
鲁家荣
张东培
闫昊
刘熠斌
陈小博
杨朝合
LI Ze;ZHANG Xinyang;YANG Manjun;LU Jiarong;ZHANG Dongpei;YAN Hao;LIU Yibin;CHEN Xiaobo;YANG Chaohe(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Qingdao 266580,China)
出处
《石油学报(石油加工)》
北大核心
2025年第4期991-1006,共16页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(22078364)资助。
关键词
结构导向集总
石脑油催化裂解
过渡态理论
差异化裂解机理
反应网络
反应机理解析
structure-oriented lumping
naphtha catalytic cracking
transition state theory
differential cracking mechanism
reaction network
reaction mechanism analysis
