Toluene diisocyanate residue

Details Toluene diisocyanate residue Toluene diisocyanate residue

C - Chemistry, Metallurgy

07

C

C07C 265/14 (2006.01) C07C 263/20 (2006.01)

Patent

CA 2117147

TOLUENE DIISOCYANATE RESIDUE ABSTRACT OF THE INVENTION Disclosed herein is a process for recovering toluene diisocyanate (TDI) from a TDI residue solution, comprising mixing the residue solution with a polyisocyanate consisting essentially of methylenediphenyl diisocyanate (MDI) or MDI in combination with its higher ring oligomer, followed by heating the resulting mixture over a temperature range of 130 to 250°C for a period of time sufficient to remove free TDI and thermally splittable TDI generated from equilibration of the TDI residue with MDI or the MDI oligomer by either a batch or continuous process.

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