【摘 要】
：
N,N-二甲基苯胺是生产三苯甲基甲烷类染料和香料的原料,其制备方法分为液相法和气相法两种,我国近10家DMA生产单位均采用液相法工艺,该工艺以硫酸为催化剂,间歇操作,生产效率
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N,N-二甲基苯胺是生产三苯甲基甲烷类染料和香料的原料,其制备方法分为液相法和气相法两种,我国近10家DMA生产单位均采用液相法工艺,该工艺以硫酸为催化剂,间歇操作,生产效率低,设备腐蚀严重,废酸排放量大.首先在印度开发成功的气相法工艺,由于产物的选择性仅为90%左右,低于液相法,一直未能实现工业化应用.2001年,南开大学和天津瑞凯科技发展有限公司联合研制出了一种高效苯胺甲基化催化剂,成功实现了气相法合成N,N-二甲基苯胺的工业化生产.
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