摘要
Photochemical oxidation of thiophene in n-octane/water extraction system by using air as oxidant was studied.Results obtained here can be used as the reference of oxidative desulfurization of gasoline because thiophene is one of the main sulfur-containing components in fluid catalytic cracking gasoline.A 500 W high pressure Hg lamp （wave length 365 nm, 0.19 kW·m -2 ） was used as the light source for irradiation and air was introduced by a gas pump for supplying O2.Thiophene dissolved in n-octane was photodecomposed and removed into the water phase at ambient temperature and atmospheric pressure.Thiophene can be photo-oxidized directly to sulfone,sulfoxide, or ethanedioic acid,SO<sup> 2- <sub> 4 ,CO2.The photo-oxidation kinetics of thiophene with O2 was first-order with rate constant of 4.42×10 -5 s -1 and half-time of 4.36 h.The desulfurization yield of thiophene in n-octane was 58.9% for a 5 h photo-irradiation under the conditions with air flow at 150 ml·min -1 and water/oil ratio at 1∶1.The sulfur content could be reduced from 800 μl·L -1 to less than 330 μl·L -1 .
Photochemical oxidation of thiophene in n-octane/water extraction system by using air as oxidant was studied. Results obtained here can be used as the reference of oxidative desulfurization of gasoline because thiophene is one of the main sulfur containing components in fluid catalytic cracking gasoline. A 500 W high pressure Hg lamp （wave length 365 nm, 0.19 kW · m^-2） was used as the light source for irradiation and air was introduced by a gas pump for supplying O2. Thiophene dissolved in n-octane was photodecomposed and removed into the water phase at ambient temperature and atmospheric pressure. Thiophene can be photo-oxidized directly to sulfone, sulfoxide, or ethanedioic acid, SO4^2- , CO2. The photo-oxidation kinetics of thiophene with O2 was first-order with rate constant of 4.42 × 10^s^-1 and half-time of 4.36 h. The desulfurization yield of thiophene in n-octane was 58.9% for a 5 h photo- irradiation under the conditions with air flow at 150 ml·min^-1 and water/oil ratio at 1 ： 1. The sulfur content could be reduced from 800 μl·L^-1 to less than 330μl·L^-1.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第11期2735-2738,共4页
CIESC Journal
基金
国家自然科学基金项目(20276015)
河北省自然科学基金项目(203364).~~
关键词
噻吩
光化学氧化
脱硫
水/油两相萃取系统
氧化产物
thiophene oxidation products photochemical oxidation
desulfurization~ oil/water extraction system
