回复liying发表于：2020/9/29 15:27:04悬赏金额：
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A In the three-reactor series described above filled with Catalyst E which has been reduced as previously described, a feed of about 509 cc/hr water and 107 cc/hr acrylonitrile is pumped to the first reactor. To the effluent stream from the first reactor is added about 118cc/hr acrylonitrile.The acrylonitrile employed in both cases contains about 300 ppm oxzole.The product from the three-reactor series is distilled and concentrated to about 47.5 percent aqueous acrylamide.The acrylamide exhibits a gel time of about 90 minutes
B The hydration of A is repeated with acrylonitrile containing about 50 ppm oxazole. Such acrylonitrile is prepared by treating with a commerical cation exchange resin then blending with untreated acrylonitrile to attain the 50 ppm oxazole content.The resulting aqueous acrylamide product,concentrated to about 51 percent strength,exhibits a gel time of about 180 mins.
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