Title:
CONTINUOUS PRODUCTION OF DIARYL CARBONATES FORM DIALKYL CARBONATES
Document Type and Number:
Japanese Patent JP3413613
Kind Code:
B2
Abstract:
PURPOSE: To prepare diaryl carbonates continuously by reacting dialkyl carbonates with phenols in the mass-coupled and energy-coupled combination of a counter column and a reactive column.
CONSTITUTION: The reaction is carried out in the mass-coupled and energy- coupled combination of a counter column A and a reactive column B, in which an aromatic hydroxyl compound 1 removed in an at least partially liquid state from the column B and a mixture 2 consisting of 100 to 95 pts.wt. of dialkyl carbonate removed in a gaseous state and 0 to 5 pts.wt. of alcohol in the column A are reacted with each other in the presence of a transesterification catalyst, in a liquid phase, at the temperature of 100 to 300°C and the pressure of 0.05 to 20 bar. The head product 6 (gaseous mixture of alcohols and raw materials) in the column A and a still residue product (containing alkylaryl carbonates) 5 are feed to the column B and the reaction is carried out at the temperature of 100 to 300°C and from 0.05 to 5 bar, and the diaryl carbonate formed is removed from the tube 7.
Inventors:
Norbert Cien
Reinhard Langer
Hans-Joseph Bouiscyu
Paul Bagner
Reinhard Langer
Hans-Joseph Bouiscyu
Paul Bagner
Application Number:
JP21795493A
Publication Date:
June 03, 2003
Filing Date:
August 11, 1993
Export Citation:
Assignee:
Bayer Aktiengesellschaft
International Classes:
C07C68/06; C07C69/96; (IPC1-7): C07C69/96; C07C68/06
Domestic Patent References:
| JP4235951A | ||||
| JP4211038A | ||||
| JP49358A | ||||
| JP3291257A | ||||
| JP61291545A | ||||
| JP4230243A | ||||
| JP4198141A |
Attorney, Agent or Firm:
Heikichi Odashima