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. 19, 1978
Filed:
Feb. 02, 1977
Alton E Martin, Lake Jackson, TX (US);
Warren D White, Lake Jackson, TX (US);
Samuel L Smolik, Lake Jackson, TX (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
A process for producing polyamines such as methylene dianiline wherein an aromatic amine such as aniline is reacted with formaldehyde in the presence of an acid catalyst sufficient water is employed to cause a separation into an aqueous phase and an organic phase and the methylene dianiline is extracted with a solvent said process is improved by employing as the solvent a mixture of aniline and either a water immiscible organic solvent such as orthodichlorobenzene or conducting the extraction in the presence of a water soluble inorganic salt such as zinc nitrate or a combination thereof.