Organic compounds -- part of the class 532-570 series – Organic compounds – Carbonate esters
Reexamination Certificate
2005-10-12
2009-11-24
Shiao, Rei-tsang (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbonate esters
C558S274000
Reexamination Certificate
active
07622601
ABSTRACT:
A specific industrially useful process for the production of a high-purity diaryl carbonate in which a diaryl carbonate having low contents of intermediate boiling point and high boiling point impurities is produced is disclosed. As a starting material, a reaction mixture containing an alkyl aryl carbonate obtained through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound is used. The process in which separation by distillation is carried out uses three distillation columns in a specified order. Moreover, it is particularly preferable if a reactive distillation column and the three distillation columns, each of which has a specified structure, and the three distillation columns are each operated under specified distillation conditions.
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Fukuoka Shinsuke
Hachiya Hiroshi
Matsuzaki Kazuhiko
Miyaji Hironori
Asahi Kasei Chemicals Corporation
Birch & Stewart Kolasch & Birch, LLP
Shiao Rei-tsang
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