METHOD FOR RECOVERING ANILINES

PURPOSE:To obtain anilines useful as a synthetic raw material for organic compounds at a high recovery ratio, by bringing a condensate of aniline with formaldehyde into contact with hydrogen in the presence of an iridium catalyst in an ether based solvent. CONSTITUTION:Aniline is condensed with form...

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1. Verfasser:	KISO YOSHIHISA
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain anilines useful as a synthetic raw material for organic compounds at a high recovery ratio, by bringing a condensate of aniline with formaldehyde into contact with hydrogen in the presence of an iridium catalyst in an ether based solvent. CONSTITUTION:Aniline is condensed with formaldehyde in the presence of an acidic catalyst to provide a condensate, which is then reacted with hydrogen in the presence of an iridium catalyst in an ether based solvent (e.g., triethylene glycol dimethyl ether) at 150-400 deg.C under 10-100kg/cm pressure to recover the aniline. Methylenedianiline is formed together with a high polymer condensate of the aniline with the formaldehyde as a by-product by condensing the aniline with the formaldehyde. Thereby, the anilines can be recovered from the 2,4'-isomer, 2,2'-isomer, etc., and high polymer condensates having low availability in the methylenedianiline in high yield.