ORGANIC SOLVENT PURIFICATION METHOD AND PURIFICATION SYSTEM

A purification method for separating and purifying an organic solvent from a liquid mixture of an organic solvent and water, the organic solvent having a boiling point of more than 100 °C at 1 atm, includes: a step of passing the liquid mixture through a first ion exchange device (20); a step of sup...

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Hauptverfasser: YAMADA Kyosuke, TERASHI Ryosuke
Format: Patent
Sprache:eng ; fre ; ger
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Zusammenfassung:A purification method for separating and purifying an organic solvent from a liquid mixture of an organic solvent and water, the organic solvent having a boiling point of more than 100 °C at 1 atm, includes: a step of passing the liquid mixture through a first ion exchange device (20); a step of supplying the liquid mixture discharged from the first ion exchange device (20) to a pervaporation device (30) to selectively separate water component; a step of supplying the organic solvent recovered from the concentration side of the pervaporation device (30) to an evaporator (40) to obtain a purified organic solvent; and a second ion exchange step of passing, through the second ion exchange device (50), a portion of liquid containing the organic solvent and flowing at a first position subsequent to the first ion exchange device (20). The liquid discharged from the second ion exchange device (50) is returned to a second position which is a preceding stage of the pervaporation device (30).