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介绍了以N-乙基苯胺、光气为原料，制备Ⅰ#中定剂（N，N-二乙基二苯基脲）的生产过程，并指出了该过程与其它生产方法的不同和优点，以及产品外观颜色的控制要点。
The production process of Ⅰ # medium (N, N-diethyldiphenyl urea) using N-ethylaniline and phosgene as raw materials is introduced, and the differences and advantages between this process and other production methods are pointed out , As well as product appearance color control points.