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AssigneeCovestro Deutschland AG
InventorsMichael Merkel, Christoph Eggert, Ralf Schneider, Robert Maleika, Sebastian Stolz
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The invention relates to a method for treating residue from the production of organic isocyanates via the phosgenation of organic amines, comprising a step of mixing a first residue A with a second residue B, obtaining a residue mixture, wherein the residue A is obtained from the production of 1,5-pentane diisocyanate and the residue B comes from the production of an isocyanate that is different from 1,5-pentane diisocyanate. The invention also relates to the use of a first residue A from the production of 1,5-pentane diisocyanate to stabilise a second residue B from the production of at least one organic isocyanate that is different from 1,5-pentane diisocyanate, and stabilised residue mixtures.
A process for treatment of residues from the production of organic isocyanates by phosgenation of organic amines, comprising a mixing step of a first residue A with a second residue B to obtain a residue mixture, wherein residue A is obtained from a production of 1,5-pentane diisocyanate and residue B is obtained from a production of an isocyanate distinct from 1,5-pentane diisocyanate.
12-14. (canceled)
A stabilized residue mixture comprising 10% to 80% by weight of a first residue A from the production of 1,5-pentane diisocyanate and 20% to 90% by weight of a residue B from the production of isophorone diisocyanate, bis(isocyanatomethyl)norbornane (NBDI) or 1,3- and 1,4-bis(isocyanatomethyl)cyclohexane.
A stabilized residue mixture comprising 5% to 30% by weight of a first residue A from the production of 1,5-pentane diisocyanate and 70% to 95% by weight of a second residue B from the production of xylylene diisocyanate.
Dependencies are inferred from the claim text.