Title:
METHOD FOR REFINING WATER-CONTAINING ORGANIC SOLVENT
Document Type and Number:
Japanese Patent JP2003080001
Kind Code:
A
Abstract:
To provide a method for refining an organic solvent advantageously in terms of equipment and operation costs.
In the method for refining the water-containing organic solvent, the water and organic solvent are transferred in an azeotropic composition by batch distillation from the water-containing organic solvent to the top of a distillation column, the water sticking to the inside of solvent recovering piping from the top of the distillation column and/or the inside of a condenser is removed by passing a gas, preferably nitrogen having ≤-70°C dew point, and the solvent is recovered by batch distillation from the top of the distillation column. The concentration of water in the refined solvent is lowered to ≤100 wt.ppm.
Inventors:
AONO MASAYUKI
OBARA KOICHIRO
MAEDA TAKUYA
FURUKAWA NAOKI
OBARA KOICHIRO
MAEDA TAKUYA
FURUKAWA NAOKI
Application Number:
JP2001279312A
Publication Date:
March 18, 2003
Filing Date:
September 14, 2001
Export Citation:
Assignee:
KANEGAFUCHI CHEMICAL IND
International Classes:
B01D3/00; C07C7/06; C07C9/15; C07C17/386; C07C19/01; (IPC1-7): B01D3/00; C07C7/06; C07C9/15; C07C17/386; C07C19/01
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