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:
Sep. 10, 2013
Filed:
Oct. 20, 2005
Markus Siegert, Heidelberg, DE;
Neven Lang, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Achim Stammer, Freinsheim, DE;
Thorsten Friese, Mannheim, DE;
Markus Siegert, Heidelberg, DE;
Neven Lang, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Achim Stammer, Freinsheim, DE;
Thorsten Friese, Mannheim, DE;
BASF Aktiengesellschaft, , DE;
Abstract
Processes are disclosed comprising: (a) reacting an aqueous formaldehyde solution in a reactor in the presence of a suitable catalyst to obtain a reaction product mixture comprising trioxane, formaldehyde and water; (b) distilling the reaction product mixture to form a top stream comprising crude trioxane; and (c) treating the top stream in one or more additional stages to form pure trioxane; wherein an aqueous sidestream is drawn off during the distilling of the reaction mixture.