| 摘要 |
PURPOSE:To dehydrate and purify water-containing crude acetonitrile by-produced in the production of acrylonitrile and methacrylonitrile, efficiently, by extracting the crude acetonitrile with an alkali and removing the separated water layer. CONSTITUTION:For example, water-containing crude acetonitrile introduced into the first extractor 2 through the feed pipe 1 is mixed with an alkali fed through the alkali-feeding pipe 5, and the mixed solution is fed into the first separation tank 7 through the discharge pipe 6 to separate the oil layer from the water layer. The oil layer is fed into the second extractor 2' through the pipe 1' and the water layer is discharged through the discharge pipe 8. Purified acetonitrile is recovered from the oil layer by carrying out the dehydration purification continuously in the same manner. The alkali is preferably NaOH or KOH and its amount is 10-50wt% on the basis of the amount of water contained in the crude acetonitrile. The operation temperature is preferably 20-30 deg.C. |
