Process for the production of di- and polyamines of the diphenylmethane series

Process for the production of di- and polyamines of the diphenylmethane series

  • CN 101,801,910 A
  • Filed: 08/28/2008
  • Published: 08/11/2010
  • Est. Priority Date: 09/19/2007
  • Status: Active Application
First Claim
Patent Images

1. technology that is used to produce aromatic polyamine, it comprises step:

  • (a) in the presence of acid catalyst, aromatic amine and formaldehyde are reacted, produce and contain two-and the reaction mixture of polyamines;

    (b) neutralize that this contains two-and the reaction mixture of polyamines;

    (c) the neutral reaction mixture being separated into organic phase and water, this organic phase contains two-and polyamines;

    (d) optional as isolated organic phase in the further treatment step (c) that gets off;

    (d1) water or other solvent cleaning, (d2) mixture separation that will clean becomes organic phase and water subsequently, (d3) further this organic phase of classification, produce two-and the polyamines that purifies on the one hand, produce aromatic amine/water on the other hand;

    Be characterised in that being separated in the step (c) be by use method itself below any one or this method and one or more additive methods combine promoted;

    (A) isolating aqueous phase is removed some water in the neutral reaction mixture that is obtained from step (b) or from step (c);

    (B) inorganic salt are joined in the neutral reaction mixture that is obtained in the step (b) or isolating aqueous phase in the step (c).

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×