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:
Apr. 29, 1986
Filed:
Jun. 18, 1985
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
In a process for the production of an aminophenol which comprises reacting a divalent phenol and ammonia in the absence of a catalyst or in the presence of a water-soluble catalyst, then separating the reaction mixture after the reaction to recover a separated and recovered product containing an aminophenol and the unreacted divalent phenol, and separating and purifying the aminophenol from said separated and recovered product, the process for the production of an aminophenol which is characterized by, on separating and purifying said aminophenol, contacting said separated and recovered product with an aliphatic ether substantially incompatible with said aminophenol in an inert gas atmosphere at a temperature at which said separated and recovered product melts or higher, then cooling to induce the crystallization of the aminophenol, thereafter filtering and recovering to obtain a cake mainly composed of said aminophenol, further melting and contacting this cake with an aliphatic ether in an inert gas atmosphere in the co-presence of water and a surfactant, and then cooling to induce the crystallization of said aminophenol and recovering it. According to the invention, a high-quality aminophenol can be produced.