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. 06, 1988
Filed:
Mar. 07, 1988
Applicant:
Inventors:
Francesco Cellini, Spinea, IT;
Vittorio Gervasutti, Mestre, IT;
Raffaele Tancorra, Venezia, IT;
Sergio Tonti, Mestre, IT;
Assignee:
Montedipe S.p.A., Milan, IT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
540535 ;
Abstract
The invention concerns a two-step process for the synthesis of caprolactam by reaction of cylcohexanone-oxime with an excess of oleum, carried out in a first step with only a portion of the oxime and in the presence of liquid SO.sub.2, according to usual 'cold' techniques, the amount of free SO.sub.3 in the oleum being equal to or greater than 50% by weight, wherein said 'cold' step is completed by a second 'hot' step, by adding a second portion of oxime, the ratio between said second portion and said first portion ranging from 0.5 to 1.2.