SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (3): 274-277.DOI: 10.1016/j.cjche.2016.08.011

• Separation Science and Engineering • Previous Articles     Next Articles

Separation process of butanol-butyl acetate-methyl isobutyl ketone system by the analysis to residual curve and the double effect pressure-swing distillation

Chunli Li, Yuanyuan Song, Jing Fang, Yang Liu, Weiyi Su, Yuqi Hu   

  1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
  • Received:2016-02-27 Revised:2016-08-07 Online:2017-04-15 Published:2017-03-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (21306036) and the Basic Research Program of Hebei Province (16964502D).

Separation process of butanol-butyl acetate-methyl isobutyl ketone system by the analysis to residual curve and the double effect pressure-swing distillation

Chunli Li, Yuanyuan Song, Jing Fang, Yang Liu, Weiyi Su, Yuqi Hu   

  1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China
  • 通讯作者: Chunli Li
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21306036) and the Basic Research Program of Hebei Province (16964502D).

Abstract: The separation of ternary mixture of butanol, butyl acetate, andmethyl isobutyl ketone (MIBK)was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first step of separation. The optimum mass ratio of extra MIBK was 1.6 in the modified feed stream according to the residual curve. Thus on this condition the top product was butanol-MIBK azeotrope while the bottom product was butyl acetate in the preliminary separation of the mixture. Then the butanol and MIBK azeotrope was separated by the double effect pressures wing distillation with the low pressure column performing at 30 kPa and the atmospheric pressure column at 101 kPa. The optimal operating conditions were then obtained by using Aspen Plus to simulate and optimize the process. The results showed that the mass purities of butanol, butyl acetate, and MIBK were all more than 99% and reached the design requirements. Additionally, compared with the traditional distillation with outside heating, the double effect pressure swing distillation saved the reboiler duty by 48.6% and the condenser duty by 44.6%.

Key words: Residual curve, Azeotropic distillation, Pressure-swing distillation, Aspen Plus

摘要: The separation of ternary mixture of butanol, butyl acetate, andmethyl isobutyl ketone (MIBK)was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first step of separation. The optimum mass ratio of extra MIBK was 1.6 in the modified feed stream according to the residual curve. Thus on this condition the top product was butanol-MIBK azeotrope while the bottom product was butyl acetate in the preliminary separation of the mixture. Then the butanol and MIBK azeotrope was separated by the double effect pressures wing distillation with the low pressure column performing at 30 kPa and the atmospheric pressure column at 101 kPa. The optimal operating conditions were then obtained by using Aspen Plus to simulate and optimize the process. The results showed that the mass purities of butanol, butyl acetate, and MIBK were all more than 99% and reached the design requirements. Additionally, compared with the traditional distillation with outside heating, the double effect pressure swing distillation saved the reboiler duty by 48.6% and the condenser duty by 44.6%.

关键词: Residual curve, Azeotropic distillation, Pressure-swing distillation, Aspen Plus