维生素E热裂解行为研究  

Study on pyrolysis of vitamin E

作　　者：缪恩铭 耿永勤 陈建华[1] 杨叶昆[1] 徐济仓[1] 魏玉玲[1] 李雪梅[1] 

机构地区：[1]云南烟草科学研究院,云南昆明650106

出　　处：《云南大学学报（自然科学版）》2012年第6期695-700,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：云南中烟工业有限责任公司资助项目(2012JC05);云南省"烟草化学省创新团队"项目(2009CI014)

摘　　要：组合应用热裂解-冷进样-气质联用(Py-CIS-GC/MS)技术,对维生素E在无水空气、9%氧氮混合气、氦气中,300,600,900℃下的裂解产物进行研究,结果显示:①维生素E在各个裂解气氛及裂解温度下共有的裂解产物有壬醛、1-甲基-2-戊基-环丙烷、维生素E;②对于在900℃和600℃时的裂解,在同一裂解温度下,随着裂解气氛中含氧量的减少,烯烃类物质种数减少,质量分数下降;烷烃类物质其种数虽然减少,但质量分数却明显增大;酮、醛、醇、酯、呋喃类香味物质随着裂解气氛中含氧量的减少其个数减少,质量分数下降;对于同一个裂解气氛,随裂解温度的降低其裂解产物中烯烃类、烷烃类物质种数呈减少趋势且含量下降;酮、醛、醇、酯、呋喃类物质产物种数和含量变化不大;③300℃时裂解产物以维生素E的原形转移为主,并生成了壬醛、烷烃类物质等;④裂解温度在600℃及900℃时维生素E原形转移的量差别不大,平均质量分数约为17.80%;而在300℃时,在无水空气、氧氮混合气、氦气氛围下转移的量分别为90.24%、84.61%和75.60%.The pyrolysis products of vitamin E at 300℃, 600 ℃ and 900 ℃ in atmosphere of air, nitrogen of 9% oxygen and helium respectively was analyzed by pyrolysis - cryo -trap（CIS） -gas chromatography -mass spectrometry （ PY - CIS - GC/MS）. The results showed that：（1）Vitamin E at all pyrolysis atmospheres and tem- peratures have the following pyrolysis products ： nonanal, cyclopropane, 1 - methyl - 2 - pentyl - , vitamin E ; （2） Pyrolysis products of vitamin E at 900 ℃ and 600 ℃ ,for the same pyrolysis temperature ,with decreasing of pyrol- ysis oxygen content,the quantity and content of alkenes decrease, and the quantity decrease and the content in- crease of alkanes, while the quantity and content of ketones, aldehydes, alcohols, esters, furans decrease ; with de- creasing of pyrolysis temperature, for the same pyrolysis atmosphere, the quantity and content of alkenes, alkanes decreas while the quantity and content of ketones, aldehydes, alcohols, esters, furans change little ; （3）At 300 ℃, the main pyrolysis products is vitamin E,nonanal and alkanes are also included;（4）Vitamin E transferred to its own pyrolysis products directly shows little difference in content at 600 ℃ and 900 ℃, the average content is 17.80% ;in air, nitrogen of 9% oxygen and helium this content at 300℃are ：90.24% ,84.61% and 75.60% re- spectively.

关 键 词：维生素E 势裂解 裂解气氛 裂解温度 

分 类 号：O629.4[理学—有机化学]