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:
Dec. 18, 2007
Filed:
Sep. 24, 2004
Werner Reutemann, Bobenheim-Roxheim, DE;
Theodor Weber, Ludwigshafen, DE;
Karl-heinz Ross, Grünstadt, DE;
Manfred Julius, Limburgerhof, DE;
Werner Reutemann, Bobenheim-Roxheim, DE;
Theodor Weber, Ludwigshafen, DE;
Karl-Heinz Ross, Grünstadt, DE;
Manfred Julius, Limburgerhof, DE;
BASF Aktiengesellschaft, , DE;
Abstract
The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream () which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column (), the remaining components of the product stream obtained as bottoms () are fed to a second column (). Trimethylamine () is separated off in the second column () by extractive distillation with introduction of water. The further of the product stream obtained as bottoms () from the second column () are fed to a third column (), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column (). To avoid corrosion alkali metal hydroxide is added to the second or third column ().