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:
Apr. 20, 2010
Filed:
Jun. 12, 2006
Eckhard Stroefer, Mannheim, DE;
Hans Hasse, Kaiserslautern, DE;
Sergej Blagov, Stuttgart, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME) by reacting formaldehyde with methanol and subsequently working up the reaction mixture by distillation, consisting of: a) feeding aqueous formaldehyde solution and methanol into a reactor and reacting to give a mixture including formaldehyde, water, methylene glycol (MG), polyoxymethylene glycols (MG), methanol, hemiformals (HF), methylal (POMDME) and polyoxymethylene glycol dimethyl ethers (POMDME); b) feeding the reaction mixture a into a first distillation column and separating into a low boiler fraction band a high boiler fraction bincluding formaldehyde, water, methanol, MG, HF and POMDME; c) feeding the high boiler fraction binto a second distillation column and separating into a low boiler fraction cincluding formaldehyde, water, MG, MG, methanol, HF, di-, tri- and tetraoxymethylene glycol dimethyl ether (POMDME), and a high boiler fraction c; d) feeding the low boiler fraction cinto a third distillation column and separating into a low boiler fraction dand a high boiler fraction dsubstantially consisting of formaldehyde, water, MG, MGand POMDME; e) feeding the high boiler fraction dinto a phase separation apparatus and separating into an aqueous phase esubstantially consisting of formaldehyde, water, MG and MG, and an organic phase eincluding POMDME; and f) feeding the organic phase einto a fourth distillation column and separating into a low boiler fraction fsubstantially consisting of formaldehyde, water, MG and MG, and a high boiler fraction fsubstantially consisting of POMDME.