Continuous production process of diarylcarbonates

Details Continuous production process of diarylcarbonates Continuous production process of diarylcarbonates

1993-10-28

1995-06-20

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

C07C 6996

Patent

active

054262070

ABSTRACT:
A diaryl carbonate is produced by transesterification of a dialkyl carbonate, such as dimethyl carbonate, with an aromatic hydroxy compound, such as phenol, in three successive reaction zones. A transesterification catalyst, such as a titanate ester or ester mixture is used in each zone. Conditions are selected to maximize formation of alkyl aryl carbonate in the first and second reaction zones, while conversion to diaryl carbonate is favored in the third reaction zone. The vaporous mixture from the first two reaction zones is a mixture containing alkyl alcohol, dialkyl carbonate, alkyl aryl carbonate and aromatic hydroxy compound. This mixture is separated in an alkyl alcohol recovery zone by distillation in the distillation columns to produce useful recycle streams. The second of these distillation columns can be operated at a lower pressure than the first, thus enabling the heat of vaporization of this mixture to be used as the source of heat for the reboiler of the second distillation column of the alkyl alcohol recovery zone.

REFERENCES:
patent: 4045464 (1977-08-01), Romano et al.
patent: 4182726 (1980-01-01), Illuminati et al.
patent: 4410464 (1983-10-01), Hallgren
patent: 4609501 (1986-09-01), Mark
patent: 5210268 (1993-05-01), Fukuoka et al.
J. L. R. Williams et al., J. Org. Chem., 24(1), pp. 64-69 (1959).

Affiliated with

Also associated with

Rating

Continuous production process of diarylcarbonates does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Continuous production process of diarylcarbonates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous production process of diarylcarbonates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1845186