摘要
研究了在热反应条件下石油渣油中饱和烃夺氢氢转移能力的测定方法和结果。饱和烃受热生成的自由基可从氢化芳烃四氢萘夺取活泼氢 ,由此可测定不同饱和烃的夺氢能力。研究结果表明 ,饱和烃可剧烈裂化而具有较强的夺氢能力 ,且这种夺氢能力随反应条件苛刻度增大而增强。对于正构烷烃或石蜡系列 ,其夺氢能力随分子量增大而增强。而对于不同来源石油渣油的饱和分 ,其夺氢能力的差别不大。沥青质的存在可诱导饱和烃剧烈裂化 。
ion abilities (H a) of model saturate hydrocarbons under thermal cracking were investigated In principle, the saturate hydrocarbons would crack thermally into free radicals, which in turn would strongly abstract hydrogen from tetralin, a typical model hydroaromatic compound found in residua Thus H a of saturate hydrocarbons under thermal cracking may be used as an index to grade the chemical role played in a residue thermal reaction system The experimental results showed that normal hydrocarbons break down vastly under thermal cracking conditions (c a 400?℃), giving strong hydrogen abstraction abilities For the n C x (x=16, 24, 30, 36) hydrocarbon or paraffin (No 56 #, 62 #, 64 #, 68 #) series, H a increased with increasing molecular weight of the corresponding reactants, and the reaction severities However, H a of saturates from different residua seem to be quite constant Furthermore, H a of saturate hydrocarbons can be drastically enhanced by residue asphaltenes under thermal cracking, and the corresponding synergistic reaction mechanism is provided
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2001年第5期404-407,共4页
Journal of Fuel Chemistry and Technology
基金
重质油国家实验室开放课题 ( 2 0 0 0 6 )~~
关键词
渣油
饱和烃
热裂化
夺氢能力
氢转移
测定方法
petroleum residue
saturate hydrocarbons
thermal cracking
hydrogen abstraction ability
hydrogen transfer
