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:
Aug. 31, 1976
Filed:
Jan. 13, 1975
William C Meluch, Birmingham, MI (US);
Gregory A Campbell, Romeo, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
In accordance with a preferred embodiment of this invention, amines may be efficiently recovered from the aqueous vapor produced by a high temperature hydrolytic decomposition of polyurethane by the following steps: 1) spraying the vapor with a relatively cool aqueous dispersion containing about 5 to 20% by weight of a solvent such as aniline or benzyl alcohol, 2) allowing the resulting effluent to settle into an amine rich organic phase which is separated from an aqueous phase by a clean interface, 3) separating the two phases, and then 4) distilling the organic phase to recover the desired amine product. The spraying may be conducted at atmospheric pressure and at a temperature within the range of 35.degree. to 90.degree. C. The majority of the solvent is also recovered during the distillation of the organic phase. The aqueous phase may also be distilled to recover additional amines and water, which may then be recycled.