Separating toluene diisocyanate and/or higher boiling solvents from distillation residues of the toluene diisocyanate manufacture using a fluidized bed
AssigneeBASF SE
InventorsWaldemar Koehler, Bernd Blumenberg, Ludwig Vogel, Eckhard Hetzel
Life of this patent
Estimating the term…
Abstract
A process for separating toluene diisocyanate and/or higher boiling solvents from distillation residues obtained from the phosgenation of toluene diamine in the presence of solvents wherein the separation takes place in a fluidized bed at temperatures of 140.degree. C. to 280.degree. C.
Claims9
A process for the separation of toluene diisocyanates and/or higher boiling solvents from distillation residues obtained during the reaction of toluene diamine with phosgene in the presence of solvents and subsequent distillation of the reaction solution comprising treating the distillation residues in a fluidized bed at temperatues of 140.degree. C. to 280.degree. C.
A process for the separation of toluene diisocyanates and/or higher boiling solvents from distillation residues obtained during the reaction of toluene diamine with phosgene in the presence of solvents and subsequent distillation of the reaction solution comprising establishing a fluidizing bed by placing an initial material of an average particle size of 0.5 micron to 5000 microns into a fluidized bed reactor;
- feeding a fluidizing gas to establish a specified void fraction of 0.4 to 0.75, at a velocity of 0.1 meter per second to 2 meters per second at normal conditions of 20.degree. C. and 760 mmHg and which said fluidizing gas is recycling nitrogen;
- injecting the distillation residue containing a desired product by a two-product jet into the fluidized bed and injecting the atomizing gas into the fluidized bed with a supply pressure of 1.5 bars to 10 bars.
Dependencies are inferred from the claim text.