| 摘要 |
1508942 SO 2 from waste liquors; H 2 SO 4 SUMITOMO CHEMICAL CO Ltd 18 June 1976 [24 June 1975] 25487/76 Heading C1A [Also in Division C2] Waste waters from the production of lactam by rearrangement of cycloalkanone oximes with conc. or fuming H 2 SO 4 followed by neutralization of the reaction product with ammonia and the separation of ammonium sulphate and lactams, are concentrated by distillation, to a water content in the range 15-70% by weight, remaining lactam is extracted from the concentrate with an aromatic hydrocarbon extraction solvent, and the remaining liquor is subjected to oxidative combustion to SO 2 , e.g. at 800‹-1300‹C, with air in the presence of S. The SO 2 is converted to H 2 SO 4 for re-use. |
