| 摘要 |
<p>Provided is a process for producing a polyamine such as diaminodiphenylmethane and polymethylene polyphenylene polyamine, capable of reliably preventing deterioration of catalytic activity and decline in selectivity, even though polysiloxane is repeatedly used. A condensate of aniline and formaldehyde is subjected to a rearrangement reaction in the presence of an organic sulfonic acid group-containing polysiloxane to form a product containing diaminodiphenylmethane, polymethylene polyphenylene polyamine and a by-product, and when the product is measured by liquid chromatography using a UV detector at a wavelength of 200 nm, a peak area of the by-product, relative to the total peak area of a peak area of the by-product, a peak area of the diaminodiphenylmethane, a peak area of the polymethylene polyphenylene polyamine and a peak area of the aniline, is reduced to 1.0% or less.</p> |
