摘要
采用管式反应器,以卤代苯和H2S为原料,高温气相反应合成苯硫酚,研究了反应机理并通过傅里叶变换红外光谱(FT-IR)和核磁共振氢谱(1 H-NMR)对产物进行了表征。为探究管式反应器结构对气相反应的影响,利用流体力学软件FLUENT模拟管式反应器内流场情况。结果显示:通过优化反应器结构,改善了物料混合效果,显著提高了苯硫酚的产率。通过考察反应器结构、反应温度、物料物质的量比、停留时间对合成苯硫酚的影响,得出最佳工艺条件:氯苯为原料,反应温度为600℃,n(H2S)∶n(PhCl)=2.5∶1,物料的停留时间45s,苯硫酚的产率50.2%;溴苯为原料,反应温度为580℃,n(H2S)∶n(PhBr)=2∶1,物料的停留时间45s,苯硫酚的产率62.4%。实验结果表明:溴苯为原料,苯硫酚的产率更高,副反应少。利用管式反应器高温气相合成苯硫酚,生产效率高,具有良好的工业应用前景。
Thiophenol was synthesized with halogenated benzene and hydrogen sulfide by high temperature gas phase reaction in tubular reactor.The flow field of tubular reactor was simulated by the computaional fluid dynamics software FLUENT to understand the effects of the tubular reactor structure on gas-phase reaction.The yield of thiophenol was increased by optimizing design of reactor structure and improving material mixing effect.Effects of reactor structure, temperature, reactants molar ratio and residence time on production of thiophenol compounds were studied and the structure of products were characterized by FT-IR and 1H-NMR.The results showed the optimal reaction conditions of chlorobenzene and hydrogen sulfide were at 600 ℃, n（hydrogen sulfide）∶n（chlorobenzene）=2.5∶1, reactants residence time was 45 s, under this condition, the yield of thiophenol was 50.2%;the optimal reaction conditions of bromobenzene and hydrogen sulfide were obtained at 580 ℃, n （hydrogen sulfide）∶n（Bromobenzene）=2∶1, reactants residence time was 45 s, under this condition, the yield of thiophenol was 62.4%.The experimental results indicated higher yield and fewer side effects by using bromobenzene as reactant.This method has the advantage of high productivity and strong potential for industrial production about synthesis thiophenol through high temperature gas phase reaction in tubular reactor.
出处
《青岛科技大学学报（自然科学版）》
CAS
2017年第3期71-79,共9页
Journal of Qingdao University of Science and Technology:Natural Science Edition
关键词
苯硫酚
管式反应器
优化设计
流体动力学
thiophenol
tubular reactor
design optimization
hydrodynamics
