Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2002-12-16
2004-05-25
Davis, Brian (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C564S281000, C564S296000, C568S009000, C568S054000, C568S054000
Reexamination Certificate
active
06740781
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a process recovery of catalyst components from a reaction mixture and particularly to reaction mixture from oxidative direct carbonylation.
SUMMARY OF THE INVENTION
A process for the removal and recovery of quaternary salt (A) and base (D) from a reaction mixture is disclosed. The reaction mixture resulting from oxidative direct carbonylation contains in addition to (A) and (D), at least one hydroxyaromatic compound (B) and at least one reaction product (C) and optionally a solvent, and the process entails
a) adding acid to the reaction mixture to cause conversion of (D) into a hydroxyaromatic compound (B2) b) separating the reaction mixture into b1.) that contains (C) and optionally (B) and/or (B2) and b2.) that contains (A) and optionally (B) and/or (B2), and c) reacting b1.) with a base (E) to re-form (D).
BACKGROUND OF THE INVENTION
During the oxidative direct carbonylation of aromatic hydroxy compounds in the presence of CO, O
2
a noble metal catalyst, preferably palladium, and also an inorganic cocatalyst (e.g. manganese, or cobalt salts), a base, a quaternary salt, various organic cocatalysts (e.g., quinones or hydroquinones) and drying agents are generally used (see e.g. DE-OS 27 38 437, U.S. Pat. No. 4,349,485, U.S. Pat. No. 5,231,210, EP-A 677 336, EP-A 858 991, U.S. Pat. No. 5,760,272). The process may be performed in a solvent.
After performing the reaction, product mixtures are obtained from these reactions which contain, inter alia, one or more quaternary salts A, a hydroxyaromatic compound B, reaction products C such as e.g. water and diaryl carbonates, a base D (incl. any being produced by deprotonation of a hydroxyaromatic compound with another base or the directly used salt of a hydroxyaromatic compound) and possibly solvent, additional catalyst components, auxiliary substances and impurities. Thus, there is the object of separating one or more products C from quaternary salts and bases (A and D), without decomposing sensitive products C and also recycling A, B and D to the reaction as quantitatively as possible without any of the impurities present in the reaction mixture.
The working-up of such streams in the absence of D, by an extraction and precipitation process, is disclosed in EP A1 913 197. However, this working-up process does not lead directly to re-useable products without impurities.
An extraction process for recovering bromide salts from reaction mixtures similar to those in the present application is disclosed in U.S. Pat. No. B 6,310,232. Here again, however, the process does not lead directly to re-useable products A, B and D.
REFERENCES:
patent: 3227748 (1966-01-01), Bragdon et al.
patent: 3484348 (1969-12-01), Johnson et al.
patent: 4172782 (1979-10-01), Masuko et al.
patent: 4349485 (1982-09-01), Hallgren
patent: 4487698 (1984-12-01), Idel et al.
patent: 5231210 (1993-07-01), Joyce et al.
patent: 5578110 (1996-11-01), Nakasato et al.
patent: 5760272 (1998-06-01), Pressman et al.
patent: 5898079 (1999-04-01), Pressman et al.
patent: 5981788 (1999-11-01), Ofori et al.
patent: 6310232 (2001-10-01), Ofori et al.
patent: 0 763 521 (1997-03-01), None
patent: 1 572 291 (1980-07-01), None
Fischer Peter
Hansen Sven Michael
Reisinger Claus-Peter
Bayer Aktiengesellschaft
Davis Brian
Gil Joseph C.
Matz Gary F.
Preis Aron
LandOfFree
Process for separating reaction mixtures and recycling... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for separating reaction mixtures and recycling..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for separating reaction mixtures and recycling... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3233636