Patent ID: 8871979
Filing Date: 2014-10-28
Classification: C07C

Abstract:
1. A process for providing methylene-bridged polyphenyl polyamines from aniline and formaldehyde, wherein the process comprises the subsequent steps of: a) condensing aniline and formaldehyde, providing a condensate, the molar ratio of aniline to formaldehyde being chosen in the range of 2 to 3.5; b) reacting, in a first catalytic reaction step, at a reaction temperature within the range of about 30° C. to about 100° C., said condensate over silica-alumina whereby an intermediate mixture is provided, the intermediate mixture comprising amino benzyl amines; and c) converting in a subsequent catalytic reaction step, at a temperature within the range of about 70° C. to about 250° C. and in the presence of delaminated zeolite ITQ18, said intermediate mixture into methylene-bridged polyphenyl polyamines.