石油炼制与化工 ›› 2020, Vol. 51 ›› Issue (11): 103-110.

• 控制与优化 • 上一篇    

费-托合成混醇萃取精馏模拟研究

刘素丽1,贲国勋2,金政伟1,汤志刚2,杨自玲1,郭栋2   

  1. 1. 国家能源集团宁夏煤业有限责任公司煤炭化学工业技术研究院
    2. 清华大学化学工程国家重点联合实验室
  • 收稿日期:2020-04-08 修回日期:2020-05-09 出版日期:2020-11-12 发布日期:2020-11-24
  • 通讯作者: 汤志刚 E-mail:zhg-tang@tsinghua.edu.cn
  • 基金资助:
    宁夏回族自治区重点研发计划一般科技项目;2018年度国家能源集团科技创新项目

SIMULATION STUDY ON EXTRACTIVE DISTILLATION OF F-T SYNTHETIC ALCOHOL-WATER MIXTURE

    

  1.  
  • Received:2020-04-08 Revised:2020-05-09 Online:2020-11-12 Published:2020-11-24
  • Supported by:
     

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。

关键词: 费托合成, 煤制油, 混醇, 脱水, 萃取精馏, 乙二醇

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%.

Key words: Fischer-Tropsch synthesis, coal-to-oil, mixed alcohol, dehydration, extractive distillation, ethylene glycol

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