【摘要】 对费-托合成煤制油过程副产物混醇的萃取精馏脱水工艺进行模拟研究。向某企业混醇模拟原料中分别添加乙二醇(EG)、N,N-二甲基甲酰胺(DMF)、二甲基亚砜(DMSO)3种溶剂,通过UNIFAC模型评价3种溶剂的萃取精馏脱水效果来选取最佳萃取剂,并应用于模拟混醇料液的相平衡和连续精馏试验。结果表明:EG、DMSO对混醇原料体系的萃取精馏脱水效果明显优于DMF,综合考虑萃取剂的稳定性等因素,选取EG作为混醇原料的最佳脱水萃取剂;采用EG作为萃取剂时,不同溶剂比(萃取剂与混醇的体积比)对模拟混醇料液脱水效果的试验结果和UNIFAC模拟结果吻合较好,随着溶剂比增加,精馏塔塔顶组分中的水含量降低,当溶剂比为3∶1时,塔顶混醇馏分中水质量分数可降至0.5%以下。更多还原

【Abstract】 In this paper,simulation study on extractive distillation of F-T synthesis alcohol-water azeotropic system was carried out. Ethylene glycol(EG),N,N-dimethylformamide(DMF) and dimethyl sulfoxide(DMSO) were added to the simulated mixed alcohol-water system,respectively. The best extractant was selected by evaluating the extractive distillation dehydration effect of the three solvents by UNIFAC model,and applied to the phase equilibrium and continuous distillation test of simulated mixed alcohol feed. The results showed that the effects of EG and DMSO were better than that of DMF. Considering the stability of the extractant,EG was considered as the best extractant for the dehydration of mixed alcohol-water system. When EG was used as extraction agent,the dehydration effects of different solvent ratios were in good agreement with those of UNIFAC. With the increase of solvent ratio,the water content in material at the top part of the distillation column decreased continuously. When the solvent ratio was 3∶1,the water mass fraction at the top part of the distillation column could be reduced to less than 0.5%.更多还原