PROCEDIMIENTO PARA LA OBTENCION DE MDI, EN ESPECIAL DE 2,4'-MDI.

    公开(公告)号:ES2272706T3

    公开(公告)日:2007-05-01

    申请号:ES02726142

    申请日:2002-03-06

    Applicant: BASF AG

    Abstract: Procedimiento para la obtención de MDI, que comprende los siguientes pasos: A) reacción de anilina y formaldehído en presencia de un ácido para dar metilen(difenildiaminas) y polimetilen-polifenilen-poliaminas, siendo la proporción molar de ácido respecto a amina como máximo 0, 2, B) reacción de la mezcla obtenida en el paso A) con fosgeno para dar metilen- (difenildiisocianatos) y polimetilen-polifenilen-poliisocianatos, C) separación de la mezcla obtenida a partir del paso B) en MDI monómero y MDI polímero, ascendiéndose la cantidad separada de MDI monómero a un 10 hasta un 70 % en peso, referido a la cantidad de MDI crudo, y D) separación del MDI monómero obtenido en el paso C) bajo separación de 2, 4''-MDI, separándose un 10 a un 80 % en peso de 2, 4''-MDI, referido a la cantidad total de 2, 4''-MDI, que está contenido en el MDI monómero obtenido a partir del paso C).

    3.
    发明专利
    未知

    公开(公告)号:DE10111337A1

    公开(公告)日:2002-09-12

    申请号:DE10111337

    申请日:2001-03-08

    Applicant: BASF AG

    Abstract: The invention relates to a method for producing MD1, comprising the following steps: A) aniline and formaldehyde are made to react in the presence of an acid to form methylene(diphenyldiamene) and polymethylene polyphenylene polyamine, the mol ratio of acid to amine being a maximum of 0.2; b) the mixture obtained in step A) is reacted with phosgene to form methylene (diphenyldiisocyanate) and polymethylene polyphenylene polyisocyanate; C) the mixture obtained in step B) is separated into monomer MDI and polymer MDI; and D) the monomer MDI obtained in step C) is separated from 2,4'- MDI.

    4.
    发明专利
    未知

    公开(公告)号:DE50208205D1

    公开(公告)日:2006-11-02

    申请号:DE50208205

    申请日:2002-03-06

    Applicant: BASF AG

    Abstract: MDI is prepared by a process comprising the following steps: A) reaction of aniline and formaldehyde in the presence of an acid to give methylene(diphenyldiamines) and polymethylenepolyphenylenepolyamines, the molar ratio of acid to amine being not more than 0.2, B) reaction of the mixture obtained in step A) with phosgene to give methylene(diphenyl diisocyanates) and polymethylenepolyphenylene polyisocyanates, C) separation of the mixture obtained in step B) into monomeric MDI and polymeric MDI and D) separation of the monomeric MDI obtained in step C) by isolating 2,4'-MDI.

    5.
    发明专利
    未知

    公开(公告)号:AT340204T

    公开(公告)日:2006-10-15

    申请号:AT02726142

    申请日:2002-03-06

    Applicant: BASF AG

    Abstract: MDI is prepared by a process comprising the following steps: A) reaction of aniline and formaldehyde in the presence of an acid to give methylene(diphenyldiamines) and polymethylenepolyphenylenepolyamines, the molar ratio of acid to amine being not more than 0.2, B) reaction of the mixture obtained in step A) with phosgene to give methylene(diphenyl diisocyanates) and polymethylenepolyphenylene polyisocyanates, C) separation of the mixture obtained in step B) into monomeric MDI and polymeric MDI and D) separation of the monomeric MDI obtained in step C) by isolating 2,4'-MDI.

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