发明授权
US08614352B2 Method for producing color-stable MDA and MDI 有权
生产色泽稳定的MDA和MDI的方法

Method for producing color-stable MDA and MDI
摘要:
The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is
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