摘要
通过对催化裂化汽油组成、吸光度等性质指标的跟踪测试,分析了影响汽油颜色稳定性的主要因素。研究结果表明,共轭二烯烃是汽油中不稳定组分氧化反应的引发剂,含氮化合物是主要生色基团,两者是使油品变色的主要物质。汽油中酚类化合物基本为抗氧剂,其本身不进入胶质生成物,但对汽油生胶变色起酸性催化作用。酚含量、碱氮、二烯值对汽油储存吸光度的影响具有明显规律:酚含量、碱氮、二烯值越大的汽油,储存一定时间后的吸光度越大;酚含量大小主导了油品吸光度的变化,当酚质量分数小于200μg/g时,储存吸光度变化不大,油品颜色稳定。
Based on the tracing and testing of FCC naphtha compositions and absorbance, the main factors affecting color stability are analyzed. Research shows that conjugated dienes are the initiators of non-stable component oxidation, and nitric compounds are chief chromophores. Therefore, the conjugate dienes and nitric compounds in naphtha are the main substances darkening the color. Most of phenols compounds are antioxidants and do not change into resins. However, phenol compounds act as acidic catalysts for the formation of resins and color change in FCC naphtha. The phenols content, basic N and diene number have a distinct law. The higher the content of phenols, basic nitrogen or dienes are, the greater the absorbance during storage is. Particularly, phenols content decides absorbance change of FCC naphtha. There is little absorbance change in storage and color of FCC naphtha is steady when phenols content is lower than 200 mppm.
出处
《炼油技术与工程》
CAS
北大核心
2008年第8期59-62,共4页
Petroleum Refinery Engineering
基金
中国石化股份有限公司茂名分公司科技攻关项目
关键词
催化裂化汽油
吸光度
酚类化合物
碱氮
二烯值
FCC naphtha, absorbance, phenol compound, basic nitrogen, diene number
