摘要
对比分析了直馏石脑油热裂解和催化裂解过程中甲烷产率的差异及其根源,探索了工艺参数、催化剂活性和烃类分子结构对石脑油催化裂解反应中甲烷的产率和选择性的影响。结果表明:甲烷主要来自于石脑油的催化裂解反应,催化剂上的较强Brnsted酸中心是甲烷生成的活性中心;链烷烃催化裂解更易于生成甲烷;反应温度和油剂接触时间是影响甲烷生成的关键因素,对此提出采用适宜反应温度和大剂油比,在保证原料必要的转化深度的同时,开发超短接触时间的反应技术以减少甲烷生成的技术构想。
The difference of CH4 yields in catalytic cracking and thermal cracking of naphtha were investigated. The influence of operating parameters,micro-activity of catalyst and hydrocarbon struc-tures on the CH4 yields and selectivities was explored. The results indicate that catalytic cracking reac-tion has a larger contribution to methane formation in range of 600 ℃ to 700 ℃,in which the stronger Brnsted acidic sites play a key role. Paraffinic hydrocarbons are apt to produce more methane and the protolytic cracking tend to take place on C-C bond or C-H bond adj acent to C2 carbon atom in the car-bon chain. Among the factors,the cracking temperature and reaction time are the most important. In order to make balance between conversion of feed and CH4 selectivity,the optimized measures of suit-able reaction temperature,high catalyst-to-oil ratio and short residence time are proposed.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2014年第3期1-5,共5页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司合同项目(S111026)
关键词
石脑油
催化裂解
甲烷
工艺参数
催化剂
naphtha
catalytic cracking
methane
operating parameter
catalyst
