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. 13, 2003
Filed:
Jan. 25, 2001
Applicant:
Inventors:
Jean-Pierre Schirmann, Oullins, FR;
Paul Bourdauducq, Chaponost, FR;
Assignee:
Atofina, Puteaux, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 2/116 ; C07C 4/500 ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
C01B 2/116 ; C07C 4/500 ; C07C / ; C07C / ;
Abstract
The invention concerns a method for preparing methyl ethyl ketone azine which consists in: (a) reacting ammonia, hydrogen peroxide and methyl ethyl ketone in the presence of a working solution to form an azine; (b) separating the working solution and the azine possibly containing methyl ethyl ketone which has not reacted and butanol-2; (c) recycling the working solution to step (a) after optional treatment; (d) separating the methyl ethyl ketone and the butanol-2 from the azine. The butanol-2 of the flow in step (d) is either purged or dehydrogenated in MEK and recycled at step (a).