Process for preparing dioxolane

US11655229B2 · kind B2 · utility

Assignees

• BASF SE
• KOLON PLASTICS, INC. · KR

Inventors

• Thomas Heitz · Ludwigshafen am Rhein, DE
• Marvin KRAMP · Ludwigshafen, DE
• Manfred Heilig · Ludwigshafen am Rhein, DE
• Hyunsoo Chang · Pyeonghwa-dong, KR
• JongMoon Kim · Busan, KR
• In Gi Cho · Pyeonghwa-dong, KR

Key dates

• Filing date: May 8, 2019
• Grant date: May 23, 2023
• Expiry date: Oct 15, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit (20) wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column (30) from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (40), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream (42) from the waste water column to the phase separation unit, and withdrawing a side stream (43) containing methanol from a stage below the feed stage of the waste water column.