Method of recovering amines by the hydrolytic decomposition...

Details Method of recovering amines by the hydrolytic decomposition... Method of recovering amines by the hydrolytic decomposition...

C - Chemistry, Metallurgy

08

J

260/612.1

C08J 11/14 (2006.01)

Patent

CA 1049043

METHOD OF RECOVERING AMINES BY THE HYDROLYTIC DECOMPOSITION OF POLYURETHANES Abstract of the Disclosure: 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° to 90° 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.

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