| 摘要 |
PURPOSE:To facilitate the start-up of the titled device by providing plural batch units constituting the distillation, stages, switching the distillation stages (including buffer stages), and eliminating the mixing of liqs. on the stage. CONSTITUTION:The units 1a-1e are provided with heating and cooling device, and each unit is connected to a condenser 2 and a feed tank through a solenoid valve. At first the unit 1e is used as the buffer stage, the first to fourth stages are formed by the units 1a-1c along with the unit 1e, the unit 1d is used as the reboiler stage, and specified distillation is carried out. After distillation, heating is stopped, the reboiler stage 1d is separated from other connected stages, the liq. in the unit is discharged as bottoms, the buffer stage 1e storing a reflux is used as the first stage and combined with the connected stages, and the units 1a-1c as the first to third stages are used as the second to fourth stages. Meanwhile, the emptied reboiler stage is used as the buffer stage, and the next cycle is started.
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