公开(公告)号：US20200339501A1

公开(公告)日：2020-10-29

申请号：US16071309

申请日：2017-01-12

Applicant: BASF SE

Inventor： Viktor LADNAK ,  Silvia TAURO ,  Kerstin HEINEN ,  Kal THIELE ,  Klause-Peter METZNER ,  Torsten MATTKE

IPC: C07C209/78 ,  C07C209/88 ,  B01D3/14

Abstract: A process for preparing an aromatic polyamine mixture including 4,4′-methylenedi(phenylamine) and higher homologues of MDA is provided. The process includes steps of (i) reaction of aniline with formaldehyde by means of an acid catalyst to form a crude product mixture (I), (ii) neutralization of the crude product mixture (I) and removal of the salts formed; (iii) isolation of aniline; (iv) distillation of the resulting crude product mixture so as to separate off (iv-1) a mixture (II) of MDA isomers (II-1) containing from 8 to 20% by weight of 4,4′-methylenedi(phenylamine) and not more than 0.3% by weight of secondary components (II-2) and (iv-2) a low boiler mixture of at least 55% by weight of secondary components (II-2) and MDA isomers (II-1); and (v) recirculation of the mixture (II).

公开(公告)号：US20250019483A1

公开(公告)日：2025-01-16

申请号：US18709569

申请日：2022-11-11

Applicant: BASF SE

Inventor： Frederic LUCAS ,  Nico VELING ,  Kerstin HEINEN ,  Harald SCHAEFER ,  Jens SCHEIDEL ,  Thomas GENGER

IPC: C08G18/16 ,  C08G18/02

Abstract: A process for the preparation of polyisocyanates containing iminooxadiazinedione groups, comprising reacting at least one (cyclo)aliphatic diisocyanate in the presence of at least one oligomerization catalyst, and when the reaction has reached a predeterminable degree of conversion, based on the (cyclo)aliphatic diisocyanates, stopping the reaction by addition of at least one catalyst poison for the oligomerization catalyst, wherein the oligomerization catalyst is a salt containing a fluoride or poly(hydrogen)fluoride [F−×(HF)m] as anion and the catalyst poison is a solution containing at least one alcohol comprising at least 6 carbon atoms as solvent and wherein m is a number between 0.01 and 20.