Title:
METHOD FOR SEPARATING TOLUENE DIISOCYANATE FROM THE RESIDUES OF THE PRODUCTION PROCESS OF TOLUENE DIISOCYANATE
Document Type and Number:
Japanese Patent JPH02758
Kind Code:
A
Abstract:
PURPOSE: To easily separate and recover toluene diisocyanate contained in the residues of the production process by treating the residue with an inert gas.
CONSTITUTION: The residue composed of 5-100 wt.% of a mixture of 95-50 wt.% of toluene diisocyanate(TDI) and 5-50 wt.% of a heavy product and 10-95 wt.% of a diluent is separated. The separation operation is carried out at 100°C or lower and 73-500 bar using inert gas of liquid or supercritical carbon dioxide. The extraction with carbon dioxide is conducted in the presence of a coextractant diluent selected from diluents for a phosgenation reaction such as toluene. An extract agent can be the same/different with/from the diluent used in an error reaction.
Inventors:
JIERAARU KORA
JIYORUJIYU GURO
FUERENKU SAGI
JIYORUJIYU GURO
FUERENKU SAGI
Application Number:
JP584689A
Publication Date:
January 05, 1990
Filing Date:
January 12, 1989
Export Citation:
Assignee:
RHONE POULENC CHIMIE
International Classes:
C07C263/18; C07B63/04; C07C67/00; C07C241/00; C07C263/10; C07C263/20; C07C265/12; C07C265/14; C07C; (IPC1-7): C07C263/18; C07C265/14
Domestic Patent References:
| JPS467167A | ||||
| JP45017434A |
Attorney, Agent or Firm:
Akira Asamura (2 outside)
Next Patent: JPH02759