WERKWIJZE VOOR DE CONTINUE KATALYTISCHE HYDRATATIE VAN ACRYLONITRIL TOT ACRYLAMIDE.

摘要

1459467 Acrylamide NALCO CHEMICAL CO 17 June 1974 [1 Nov 1973] 26725/74 Heading C2C Acrylamide is made by passing a mixture of acrylonitrile and water containing 25-75% by weight of acrylonitrile sequentially through at least two tubular reaction zones operating in a plug flow manner and each of the reaction zones containing a fixed catalyst bed; the process being conducted substantially isothermally at temperatures in the range of from about 100‹ to 300‹ F. and having a system weight hourly space velocity in the range of from about 0À1 to 10 hours-1, the inter-relationship between the weight hourly space velocity and the temperature, respectively, in each one of said reaction zones being such that the percentage conversion of acrylonitrile to acrylamide in each of such reaction zones ranges from about 0À5 to 1À5 times said total system conversion divided by the total number of the reaction zones. The catalyst is preferably Raney copper. At the end of the reaction the acrylonitrile may be stepped from the reaction product and recycled to the first zone. Each successive zone may be maintained at a higher temperature than the preceding zone. In an example there are three zones and (a) the order of the reaction zone may be changed to minimize the deactivation of the catalyst in individual zones and (b) one of the zones may be removed for service whilst, if desired adjusting the conditions in the other two.