Method of manufacturing aromatic urethane and intermediate product thereof

USRE34137E · kind E · reissue

Assignee

• NKK Co., Ltd. · JP

Inventors

• Takao Ikariya · Ebeye, US
• Masanori Itagaki · Kawasaki, JP
• Masatsugu Mizuguchi · Tokyo, JP
• Itaru Sakai · Yokohama, JP
• Osamu Tajima · Moriya, JP

Key dates

• Filing date: Oct 12, 1989
• Grant date: Dec 1, 1992
• Expiry date: Oct 12, 2009

Classification

• Technology area (CPC —): General

Abstract

The present invention relates to a method of manufacturing aromatic urethane, an aromatic mononitro-compound, an aromatic primary amine, and carbon monoxide being reacted using a catalyst containing a platinum group metal-containing compound as a major constituent to prepare N,N'-di-substituted urea. The resultant N,N'-di-substituted urea is reacted with a hydroxyl group-containing organic compound to prepare an aromatic primary amine and aromatic urethane, and the aromatic primary amine is separated to obtain aromatic urethane.