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159 条记录 (耗时 0.025 秒)

    Process for preparing an aromatic polyamine mixture
    2.
    发明授权
    Process for preparing an aromatic polyamine mixture 有权

    公开(公告)号：US11028042B2

    公开(公告)日：2021-06-08

    申请号：US16071309

    申请日：2017-01-12

    申请人： BASF SE

    发明人： Viktor Ladnak ,  Silvia Tauro ,  Kerstin Heinen ,  Kai Thiele ,  Klaus-Peter Metzner ,  Torsten Mattke

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

    摘要： 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).

    Process for preparation of di- and polyamines of the diphenylmethane series
    4.
    发明授权
    Process for preparation of di- and polyamines of the diphenylmethane series 有权

    公开(公告)号：US10689322B2

    公开(公告)日：2020-06-23

    申请号：US15317482

    申请日：2015-06-22

    申请人： Covestro Deutschland AG

    发明人： Thomas Knauf ,  Stefan Wershofen ,  Klaus-Gerd Gruner ,  Volker Hartjes

    IPC分类号： B01J19/00 ,  C07C209/78 ,  B01L3/14 ,  B01D17/02 ,  B01J14/00 ,  B01J19/24 ,  C02F1/04 ,  C07C209/84 ,  C07C209/86 ,  C02F101/38 ,  C02F103/36

    摘要： The present invention relates to a process for preparing di- and polyamines of the diphenylmethane series (MDA), a system for producing MDA and a process for operating a system for preparing MDA. The invention enables optimization of production standstills during operation of the MDA process with respect to time expenditure and optionally also with respect to energy and material consumption by means of a so-called recirculation mode for individual system components. During interruption of the process or interruption of the operation of individual system components, formaldehyde is not introduced into the reaction and the system components that are not affected by a revision, repair, or cleaning measure are operated in so-called recirculation mode. This enables, among other things, that only the affected system component can be put in standstill during the time period of the measure, which is advantageous in terms of productivity and economy of the process as well as in terms of the quality of the products produced.

    PROCESS FOR THE PREPARATION OF DI- AND POLYAMINES OF THE DIPHENYLMETHANE SERIES
    5.
    发明申请
    PROCESS FOR THE PREPARATION OF DI- AND POLYAMINES OF THE DIPHENYLMETHANE SERIES 审中-公开

    公开(公告)号：US20200123096A1

    公开(公告)日：2020-04-23

    申请号：US16598170

    申请日：2019-10-10

    申请人： COVESTRO DEUTSCHLAND AG

    发明人： Stefan WERSHOFEN ,  Richard ADAMSON ,  Georg PIRKL

    IPC分类号： C07C209/78 ,  C07C209/86

    摘要： The invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series (MDA), in which firstly crude MDA is prepared and is then subjected to a distillation process, wherein the distillation process comprises the following: in a distillation column, separating off a stream containing aniline and water as head product so as to obtain the first product stream as sump product, in said distillation column or in an apparatus arranged downstream of said distillation column, performing a stripping with steam so as to obtain a gaseous stream containing aniline, water and MMDA, partially condensing this gaseous stream containing aniline, water and MMDA so as to obtain a liquid stream containing MMDA and water (and optionally aniline) and a gaseous stream containing aniline and water (and optionally MMDA), drying the liquid stream containing MMDA and water (and optionally aniline) obtained by the partial condensation so as to obtain the second product stream.

    Process for the preparation of diaminobutane
    10.
    发明授权
    Process for the preparation of diaminobutane 有权

    公开(公告)号：US10221124B2

    公开(公告)日：2019-03-05

    申请号：US15557322

    申请日：2016-03-15

    申请人： DSM IP Assets B.V.

    发明人： Rinke Marcel Altink ,  Anna Maria Cornelia Francisca Castelijns

    IPC分类号： C07C209/78 ,  C07C209/68

    摘要： The present invention relates to a process for the preparation of diaminobutane from ornithine, comprising steps of: i. preparing a solution of (a) a salt of ornithine and an acid; and (b) an aldehyde or a ketone, or a mixture thereof; in (c) a solvent, wherein the solvent comprises a protic organic solvent or a dipolar aprotic organic solvent, or a mixture thereof and ii. heating the solution to a temperature above 100° C., thereby inducing decarboxylation of the ornithine and formation of diaminobutane.