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    USE OF A NITRATE SALT COMPOSITION AS A HEAT TRANSFER OR HEAT STORAGE MEDIUM FOR FIRST OPERATION OF AN APPARATUS CONTAINING THESE MEDIA
    2.
    发明申请
    USE OF A NITRATE SALT COMPOSITION AS A HEAT TRANSFER OR HEAT STORAGE MEDIUM FOR FIRST OPERATION OF AN APPARATUS CONTAINING THESE MEDIA 审中-公开

    公开(公告)号：US20190137188A1

    公开(公告)日：2019-05-09

    申请号：US16096319

    申请日：2017-04-20

    Applicant: BASF SE

    Inventor： Juergen WORTMANN ,  Sabine WEIGUNY ,  Katharina FEDERSEL ,  Matthias HINRICHS ,  Stephan MAURER

    IPC: F28D20/00 ,  C09K5/12 ,  F24S80/20 ,  F24S60/10 ,  F28D20/02

    Abstract: Use of a nitrate salt composition Z comprising Z1 at least one alkali metal nitrate and optionally alkaline earth metal nitrate and also Z2 at least one alkali metal nitrite and optionally alkaline earth metal nitrite in an amount of Z2 in the range from 1.1 to 15.0 mol % based on the sum of Z1 plus Z2 as heat transfer or heat storage medium in apparatuses in which these heat transfer or heat storage media are comprised at a temperature in the range from 500 to 620° C. and an oxygen partial pressure over the nitrate salt composition in the range from 0.1 to 1.0 atm, wherein the molar amount of the alkali metal nitrite and optionally alkaline earth metal nitrite for a desired temperature selected from the range indicated above and for a desired oxygen partial pressure selected from the range indicated above is calculated by means of the following formula x nitrite = K 6  ( T ) K 6  ( T ) + P O   2 where the variables have the following meanings: xnitrate is the mole fraction of nitrite in a nitrite/nitrate mixture, K6(T) is the temperature-dependent equilibrium constant of the reaction nitrate⇄nitrite+½ oxygen (NO3−⇄ NO2−+½ O2), pO2 is the oxygen partial pressure and T is the temperature of the nitrate salt composition, and the calculated value of the molar concentration of the component Z2 is optionally reduced by 40% or increased by 20% and the nitrate salt composition Z is heated to a maximum operating temperature in the range from 500 to 620° C. in the first start-up of said apparatuses.

    PROCESS FOR PRODUCING ISOCYANATES
    4.
    发明公开
    PROCESS FOR PRODUCING ISOCYANATES 审中-公开

    公开(公告)号：US20230312462A1

    公开(公告)日：2023-10-05

    申请号：US18023747

    申请日：2021-08-23

    Applicant: BASF SE

    Inventor： Jan Pablo JOSCH ,  Matthias HINRICHS ,  Jens FERBITZ ,  Kai THIELE ,  Torsten MATTKE ,  Stefan MAIXNER

    IPC: C07C263/10

    CPC classification number: C07C263/10

    Abstract: The invention relates to a process for producing isocyanates by reacting the corresponding amines with phosgene in the liquid phase, comprising: (a) mixing an amine comprising feed stream, a phosgene comprising feed stream and optionally an inert solvent; (b) reacting the amine with phosgene in a first reaction section to obtain an intermediate reaction mixture comprising isocyanate, carbamoyl chlorides, amine hydrochlorides and unreacted phosgene; (c) cleaving the carbamoyl chlorides and remove phosgene from the intermediate reaction mixture in a second reaction section to obtain an isocyanate comprising crude product, (d) optionally working-up the crude product; wherein reacting (b) is carried out such that the intermediate reaction mixture comprises 1.7 to 5 mol-% solid amine hydrochlorides based on the molar amount of amine fed into the process.

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