发明申请
- 专利标题: PROCESS AND SYSTEM FOR PURIFICATION OF TETRAHYDROFURAN
- 专利标题(中): 四氢呋喃的净化方法和系统
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申请号: US13505022申请日: 2009-10-30
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公开(公告)号: US20120215012A1公开(公告)日: 2012-08-23
- 发明人: Toshiaki Matsuo , Kenichiro Oka , Masayuki Kamikawa , Takeyuki Kondo , Hiroyuki Ito , Yasunari Sase , Chiaki Watanabe , Tetsuji Harigai
- 申请人: Toshiaki Matsuo , Kenichiro Oka , Masayuki Kamikawa , Takeyuki Kondo , Hiroyuki Ito , Yasunari Sase , Chiaki Watanabe , Tetsuji Harigai
- 国际申请: PCT/JP2009/068663 WO 20091030
- 主分类号: C07D307/08
- IPC分类号: C07D307/08 ; B01D3/14
摘要:
A method for purifying tetrahydrofuran from a liquid containing tetrahydrofuran and as impurities at least water, 2,5-dihydrofuran and butanol, the method comprising: a first distillation step in which the liquid is subjected to distillation using a distillation column to separate into a first bottoms product containing water as a major component and a first distillate containing tetrahydrofuran, 2,5-dihydrofuran and butanol as major components, a second distillation step in which the first distillate is subjected to distillation using a distillation column to separate into a second bottoms product containing tetrahydrofuran and butanol as major components and a second distillate containing 2,5-dihydrofuran as a major component, a third distillation step in which the second bottoms product is subjected to distillation using a distillation column to separate into a third bottoms product containing butanol as a major component and a third distillate containing tetrahydrofuran as a major component, and further comprising a recirculation step in which a part of the second top liquid is recirculated into the first distillation step as a recirculation liquid and the remaining part is discharged into the outside of the system.