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Abstract�� The traditional process of the synthesis of Red Base B is the Nbenzenesulfonylation,nitration and hydrolysis of O-anisidine. We used the process of N-phosgenation, nitration and hydrolysis of O-anisidine.This process may reduce the total raw material cost over 15 600 per ton of Red Base B.

Keywords�� s:NN��-bis (2-methoxyphenyl) urea;NN��-bis(2-methoxy-4-nitrophenyl) urea;2-methoxy-4-nitrobenzenamine

Received 1995-04-15;

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��񻪣��.��ϳɺ�ɫ��B[J]. ��ѧ��ҵ�빤��, 1995,12(2): 37-40

Liu Zhenhua;Tang Peikun.The Synthesis of Red Base B by Phosgenation Process[J]. Chemcial Industry and Engineering, 1995,12(2): 37-40