The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 23, 2023
Filed:
May. 08, 2019
Basf SE, Ludwigshafen am Rhein, DE;
Kolon Plastics Inc., Gwacheon-Si, KR;
Thomas Heitz, Ludwigshafen am Rhein, DE;
Marvin Kramp, Ludwigshafen am Rhein, DE;
Manfred Heilig, Ludwigshafen am Rhein, DE;
HyunSoo Chang, Gimcheon, KR;
JongMoon Kim, Gimcheon, KR;
In Gi Cho, Gimcheon, KR;
BASF SE, Ludwigshafen am Rhein, DE;
Kolon Plastics Inc., Gwacheon-Si, KR;
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 () 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from the phase separation unit is transferred to an upper part of a purification column () from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit.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 (), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream () from the waste water column to the phase separation unit, and withdrawing a side stream () containing methanol from a stage below the feed stage of the waste water column.