Work-up of distillation residues from the synthesis of toluene diisocyanate
AssigneeBASF SE
InventorsHans Volkmar Schwarz, Markus Maurer, Michael Sander, Eckhard Ströfer, Rene Leuthold, Burghard Hantel, Siegfried Richter, Jörg Therre
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Abstract
A process for working up distillation residues from the synthesis of tolylene diisocyanate by reaction of the distillation residues with water comprises reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of hydrolysate.
Claims16
A process for working up tolylene diisocyanate (TDI) distillation residues from the synthesis of TDI comprising providing the TDI distillation residues, and reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of reaction products of toluenediamine (TDA) residues and water.
A process for working up distillation residues from the synthesis of tolylene diisocyanate comprising providing TDI distillation residue, and reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of the reaction products of the TDA residues and water, wherein the reaction is carried out in the presence of salts of iron, zinc, tin or zirconium.
Dependencies are inferred from the claim text.