Patent
Method of preparing p-phenylenediamine (US Patent 6245943)
Korea Kumho Petrochemical Co., Ltd. · Granted Jun 12, 2001 · Filed Aug 16, 2000
Patent number: 6245943 Granted: 2001-06-12 Filed: 2000-08-16 Inventors: Young J. Joo (Taejon, KR); Jin Eok Kim (Taejon, KR); Jeong Im Won (Taejon, KR) Assignees: Korea Kumho Petrochemical Co., Ltd. (Seoul, KR)
Abstract
A disclosed method of preparing p-phenylenediamine includes the steps of: reacting urea and nitrobenzene with a base in the presence of a polar solvent to yield 4-nitrosoaniline and 4-nitroaniline; and subsequently, diluting the resulting mixed solution in an alcohol and performing hydrogenation using a
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