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AssigneeCovestro Deutschland AG
InventorsMark Jacob, Guido Grommes, Thomas Schmitz, Pascal Scherpian, Christian Jens, Michael Merkel, Stefanie Lang
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The invention relates to a method for producing isocyanates by reacting at least one amine or the salt thereof with a stoichiometric excess of phosgene in the condensed phase in the presence of a solvent, having the steps of: A) transitioning to a hot phosgenation process and B) expelling remaining phosgene and/or hydrogen chloride. The invention is characterized in that the reaction is carried out in batches in at least two reactors which are arranged parallel to one another and in that step A) and/or step B) is carried out asynchronously in at least two of the reactors arranged parallel to one another.
A process for producing isocyanates by reacting at least one amine or salt thereof with a stoichiometric excess of phosgene in the condensed phase in the presence of a solvent, comprising the steps of:
A computer-implemented process for adjusting a mass flow of absorbent in an absorption device for reprocessing phosgene-containing process offgas streams, in which a target value for the mass flow of absorbent is determined and translated into a control variable for an actuator that influences the mass flow, wherein at least one of the following measured variables or its change over time is taken into account in determining the target value for the mass flow:
Dependencies are inferred from the claim text.