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    Process for preparing an isocyanate
    4.
    发明授权
    Process for preparing an isocyanate 有权

    公开(公告)号：US10703713B2

    公开(公告)日：2020-07-07

    申请号：US16469426

    申请日：2017-12-18

    Applicant: COVESTRO DEUTSCHLAND AG

    Inventor： Tim Loddenkemper ,  Jurgen Arras ,  Markus Dugal

    IPC: C07C263/20 ,  B01D3/14

    Abstract: The industrial scale preparation of isocyanates gives rise to distillation bottom streams that are in need of further workup. These distillation bottom streams still also contain, as well as a distillation residue consisting of compounds that can be evaporated without decomposition only with great difficulty if at all (also referred to as residue for short), proportions of the desired target product (i.e. isocyanate to be prepared). The present invention relates to a process that enables recovery, in an efficient manner, of this proportion of isocyanate to be prepared in a distillation bottom stream which is obtained in the workup of the crude liquid process product which contains the isocyanate to be prepared and is formed in an isocyanate preparation process. More particularly, the present invention relates to a drying step in which the isocyanate to be prepared is recovered to form a solid material that has been largely to completely freed of this isocyanate. This drying step is characterized by a minimum content of compounds containing carbodiimide groups of 15% by mass, preferably 20% by mass, more preferably 30% by mass, based on the total mass of the distillation residue fed to the drying apparatus used, where this minimum content can also be adjusted by an in situ carbodiimidization.

    Method for producing isocyanates
    8.
    发明授权
    Method for producing isocyanates 有权

    公开(公告)号：US10435353B2

    公开(公告)日：2019-10-08

    申请号：US15776937

    申请日：2016-11-29

    Applicant: COVESTRO DEUTSCHLAND AG

    Inventor： Joachim Zechlin ,  Tim Loddenkemper ,  Friedhelm Steffens ,  Dietmar Wastian

    IPC: C07C263/10

    Abstract: The invention relates to the production of isocyanates by means of phosgenation of the corresponding primary amines in the gas phase, wherein the reactant flows of amine and phosgene are fed separately to a reactor through a pre-heated inert gas flow. Isocyanates within the sense of the invention are, in the broadest sense, all isocyanates whose corresponding amines can be substantially converted into the gas phase without decomposing, with the exception of 1,5-pentane diisocyanate.

    METHOD FOR PRODUCING ISOCYANATES
    9.
    发明申请
    METHOD FOR PRODUCING ISOCYANATES 有权

    公开(公告)号：US20220332677A1

    公开(公告)日：2022-10-20

    申请号：US17640419

    申请日：2020-09-14

    Applicant: Covestro Deutschland AG ,  Covestro Intellectual Property GmbH & Co. KG

    Inventor： Joachhim Zechlin ,  Tim Loddenkemper ,  Thomas Bludowsky

    IPC: C07C263/10 ,  C07C263/20

    Abstract: The present invention relates to a process for preparing an isocyanate comprising the steps of (A) reacting an amine with a stoichiometric excess of phosgene using an aromatic solvent of formula C6H6-XClX, wherein X=1 or 2, (a) as a diluent during the reaction and/or (b) as a means for cooling the reaction mixture formed from the reaction of the amine with phosgene (so-called quench) to obtain (optionally after a decompression) a liquid product mixture comprising the isocyanate and the aromatic solvent employed and a gaseous product mixture containing phosgene and hydrogen chloride; followed by (B) isolating the isocyanate from the liquid product mixture obtained in step (A) comprising the step of a final distillation in which the isolated isocyanate is obtained as a product stream, wherein in the final distillation or in a distillation step upstream of the final distillation at least one stream comprising aromatic solvent of formula C6H6-YClY, wherein Y=X+1, is (at intervals or continuously) discharged such that the isolated isocyanate has a mass fraction, based on its total mass, of aromatic solvent of formula C6H6-YClY in the range from 0.0 ppm to 9.9 ppm, preferably 0.0 ppm to 5.0 ppm, particularly preferably 0.0 ppm to 3.0 ppm.

    METHOD FOR PRODUCING ISOCYANATES
    10.
    发明申请
    METHOD FOR PRODUCING ISOCYANATES 审中-公开

    公开(公告)号：US20180370907A1

    公开(公告)日：2018-12-27

    申请号：US15776937

    申请日：2016-11-29

    Applicant: COVESTRO DEUTSCHLAND AG

    Inventor： Joachim Zechlin ,  Tim Loddenkemper ,  Friedhelm Steffens ,  Dietmar Wastian

    IPC: C07C263/10

    CPC classification number: C07C263/10 ,  C07C265/14

    Abstract: The invention relates to the production of isocyanates by means of phosgenation of the corresponding primary amines in the gas phase, wherein the reactant flows of amine and phosgene are fed separately to a reactor through a pre-heated inert gas flow. Isocyanates within the sense of the invention are, in the broadest sense, all isocyanates whose corresponding amines can be substantially converted into the gas phase without decomposing, with the exception of 1,5-pentane diisocyanate.

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