Title:
トルエンジイソシアネートの精製および製造方法
Document Type and Number:
Japanese Patent JP4360878
Kind Code:
B2
Abstract:
Purification of toluene diisocyanate (TDI) from its crude distillation feed (F1) involves fractionating (F1), having less than 2% by weight of phosgene, to remove the solvent (and optionally the reaction residues) to produce a crude toluene diisocyanate feed (c2), comprising less than 20% by weight of solvent, followed by separating (c2) in a dividing-wall distillation column into four fractions. Purification (M1) of toluene diisocyanate (TDI) from its crude distillation feed (F1) involves fractionating (F1), having less than 2% by weight of phosgene, to remove the solvent (and optionally the reaction residues) to produce a crude toluene diisocyanate feed (c2), comprising less than 20% by weight of solvent, followed by separating (c2) in a dividing-wall distillation column into four fractions a vapor phase low-boiler and solvent-enriched gas stream (P1), a low-boiler and solvent-enriched product (P2), a high boiler enriched bottoms product comprising (TDI) (P3), and a (TDI) product stream lean in low-boilers, high-boilers and reaction residues (P4). An independent claim is included for producing the (TDI) involving reacting toluene diamine with phosgene to give (F1), followed by (M1).
Inventors:
Marx Paul Grün
Bill Bloody Junior
Bertort Kegenhof
Kai Fairkerk
Hans-Peter Shall
Bill Bloody Junior
Bertort Kegenhof
Kai Fairkerk
Hans-Peter Shall
Application Number:
JP2003362193A
Publication Date:
November 11, 2009
Filing Date:
October 22, 2003
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
B01D3/14; C07C263/20; C07C263/10; C07C265/14
Domestic Patent References:
| JP6163644A |
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel