Patent ID: 7893301

Claim:
A method of preparing polymethylene-polyphenyl-polyamine, comprising the following steps: a) mixing aniline with hydrochloric acid in a venturi jet mixer and conducting a reaction to produce aniline hydrochloride; b) introducing the aniline hydrochloride stream into circulation pipes and mixing with a circulation solution coming from a condensation stirred vessel, then cooling the obtained mixed solution with a heat exchanger; c) introducing the cooled mixed solution and formaldehyde solution into a high gravity rotating bed reactor for mixing and conducting a pre-condensation reaction; d) introducing the materials discharged from the high gravity rotating bed reactor into the condensation stirred vessel to proceed with pre-condensation reaction and molecular rearrangement reaction; introducing a part of the reaction mixture discharged from the condensation stirred vessel into the circulation pipes as circulation solution and discharging the other part as product, and wherein the volume flow ratio of the part as circulation solution to the part as product is 3:1-50:1.