Abstract
Nylon was industrially produced by du Pont for first time shortly before World War II. Hexamethy lenediamine (HMD) is a nylon-66 intermediate.Many reports on manufacturing process for HMD have been published and almost all of them now in industrial process go through the three routes, namely via adiponitrile (ADN) by using AN. butadiene or ADA as the starting material. Now among them, the method employing ADA is used most widely, but AN electrolytic hydrodimerization process and new hydrocyanation process for reacting butadiene and hydrogencyanide are developed to eliminate the defects of conventional methods, New hydrocyanation process was recently developed by du Pont and is now believed comercialised.
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