Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1992-04-29
1994-04-26
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560 25, 560 27, 560 28, 560 30, 560 31, 560 32, C07C26900, C07C27100
Patent
active
053068424
ABSTRACT:
A method for manufacturing a purified aromatic urethane. Aromatic urethanes are synthesized from a N,N'-disubstituted urea and an organic hydroxyl compound in a reaction medium. The organic hydroxyl compound and the primary aromatic amine side product which are present in the reaction mixture is distilled off and removed from the reaction mixture leaving a distillation bottom. The N,N'-disubstituted urea is separated and removed from the distillation bottom by solvent extraction of the aromatic urethane, and the aromatic urethane in the extract phase obtained in said solvent extraction is separated and purified.
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Ikariya Takao
Itagaki Masanori
Miyazawa Makoto
Mizuguchi Masatsugu
Yamamoto Sachiko
Dees Jos,e G.
Nazario Porfirio
NKK Corporation
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