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:
Jul. 05, 1983
Filed:
Apr. 19, 1982
Applicant:
Inventors:
Placido M Spaziante, 6900 Lugano, CH;
Luigi Giuffre, Milan, IT;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2604 / ; 564 73 ;
Abstract
An improved process for the preparation of methyl isocyanate comprising reacting methyl carbamoyl chloride with an acid acceptor selected from the group consisting of 1,3-dimethylurea, urea, alkyl ureas and biuret in an organic solvent in which the acid acceptor is soluble but in which the hydrochloride salt thereof is insoluble, separating the acid acceptor hydrochloride from the liquid phase, recovering methyl isocyanate by distillation from the liquid phase, and thermally decomposing acid acceptor hydrochloride to at least a partially free acid acceptor which can preferably be used as a starting material for the production of methyl isocyanate.