公开(公告)号：JP2010270147A

公开(公告)日：2010-12-02

申请号：JP2010175044

申请日：2010-08-04

Applicant: Basf Se ,  ビーエーエスエフ ソシエタス・ヨーロピアBasf Se

Inventor： STROEFER ECKHARD ,  JACOBS JAN ,  SEYFERT WILFRIED ,  SCHWARZ HANS VOLKMAR ,  SCHWEERS OLAF ,  SCHARR VOLKER ,  PENZEL ULRICH

IPC: C07C209/78 ,  C07B61/00 ,  C07C211/45 ,  C07C211/50 ,  C07C263/10 ,  C07C265/14

CPC classification number: C07C209/78 ,  C07C263/10 ,  C07C211/50 ,  C07C265/12 ,  C07C265/14

Abstract: PROBLEM TO BE SOLVED: To provide a method for producing methylenedianiline (MDA) by reacting aniline with formaldehyde in the presence of acid catalysts while minimizing the N-methyl-MDA content as an undesirable by-product. SOLUTION: The semicontinuous method for producing MDA includes: introducing aniline with or without the acid catalyst; feeding formaldehyde with or without the acid catalyst through a mixing means into a circuit in which aniline with or without the acid catalyst and with or without previously added formaldehyde is circulated; and heating a reaction mixture to a temperature above 75°C after feeding in at least 50% of the total amount of formaldehyde to be fed. There is also provided a method for producing polyisocyanates by phosgenation of amines obtainable in such a manner. MDA is used for production of methylene-bis(phenyl isocyanate) (MDI) having a low chlorine content and/or a light color. COPYRIGHT: (C)2011,JPO&INPIT

Abstract translation: 待解决的问题：提供一种在酸催化剂存在下使苯胺与甲醛反应生成亚甲基二苯胺（MDA）的方法，同时使N-甲基-MAA含量最小化作为不合需要的副产物。 解决方案：用于生产MDA的半连续方法包括：在具有或不具有酸催化剂的情况下引入苯胺; 通过混合装置将具有或不含酸催化剂的甲醛进料到其中具有或不具有酸催化剂和有或没有预先加入的甲醛的苯胺循环的回路中; 并在加入至少50％的待进料甲醛总量之后，将反应混合物加热至高于75℃的温度。 还提供了通过以这种方式获得的胺的光气化制备多异氰酸酯的方法。 MDA用于生产具有低氯含量和/或浅色的亚甲基双（苯基异氰酸酯）（MDI）。 版权所有（C）2011，JPO＆INPIT