萃取精馏脱高温费托合成C_6馏分中的含氧化合物  

Removing oxygenates from C_6 fraction in high-temperature Fisher-Tropsch synthesis products by extractive distillation

作　　者：杨正伟[1] 孙启文[1] 张宗森[1] 

机构地区：[1]上海兖矿能源科技研发有限公司煤液化及煤化工国家重点实验室,上海201203

出　　处：《石油化工》2016年第4期402-407,共6页Petrochemical Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA05A204)

摘　　要：采用PRO-Ⅱ模拟平台,选择NRTL热力学方法,以二甲基亚砜、1-甲基-2-吡咯烷酮(NMP)、N,N-二甲基甲酰胺和乙二醇4种溶剂为萃取剂,采用萃取精馏法对高温费托合成C6馏分脱含氧化合物流程进行了模拟,并考察了V(萃取剂)∶V(C6馏分)、塔板数、进料位置、回流比等工艺条件对分离结果的影响。模拟结果显示,NMP为最佳萃取剂,最优模拟操作条件为:理论塔板数为30块、进料位置为第15块,回流比为2,溶剂比为2。采用实验室小型精馏塔对高温费托合成C6馏分进行实验验证。实验结果表明,塔顶采出液中的正丙醇+2-丁酮+丁醛的总含量小于0.1%(w),塔釜采出液中1-己烯含量小于0.1%(w),与模拟值吻合良好。The extractive distillation for removing oxygenates from C_6 fraction in high-temperature Fisher-Tropsch synthesis products was simulated by means of the PRO-Ⅱsoftware and NRTL thermodynamic method with dimethyl sulfoxide（DMSO）,N-methyl-2-pyrrolidone（NMP）,N,N-dimethylformamide（DMF） and ethylene glycol（EG） as solvents separately. The effects of solvent ratio,theoretical stage number,feeding stage position and reflux ratio on the separation were investigated. A bench-scale distillation column was used to verify the simulation results. Under the optimal operational conditions of NMP as extractant,theoretical stage number 30,feeding stage 15 th,refl ux ratio 2 and solvent ratio 2,the total mass fraction of propanol,2-butanone and butanal at the top was less than 0.1%（w） and the mass fraction of 1-hexene at the bottom was less than 0.1%（w）. The experimental data matched well with the simulation values.

关 键 词：费托合成 萃取精馏 含氧化合物 C6馏分 过程模拟 

分 类 号：TQ028.3[化学工程]