Reference

Change of solvent systems in aromatic extraction apparatus

Change of solvent systems in aromatic extraction apparatus. Spielmann, Walter; Langer, Uwe; Griep, Hans Georg; Staubach, Thomas; Klempin, Juergen; Franke, Hermann; Wittkopf, Manfred; Wittkopf, Egon (VEB Petrolchemisches Kombinat Schwedt, Ger. Dem. Rep.). Ger. (East) DD 204696 A1 7 Dec 1983, 8 pp. (German). (German Democratic Republic). CODEN: GEXXA8. CLASS: IC: C07C007-10. APPLICATION: DD 82-239504 3 May 1982. DOCUMENT TYPE: Patent CA Section: 45 (Industrial Organic Chemicals, Leather, Fats, and Waxes) Section cross-reference(s): 48, 51 In the extn. 872-50-4 and 107-21-1 which are cas registry numbers of chemicals are mentioned. of single-ring arom. hydrocarbons, N-methylpyrrolidone (I) [872-50-4] in I-ethylene glycol [107-21-1] extn. solvent mixts. is continuously replaced by N-methyl-e-caprolactam [2556-73-2] with no loss of capacity or throughput. .

Removal of hydrogen sulfide and sulfur dioxide from gases

Removal of hydrogen sulfide and sulfur dioxide from gases. Anisonyan, A. A.; Benevolenskaya, G. V.; Perevozchikova, Z. Ya.; Terekhova, T. V.; Kislenko, N. N. (All-Union Scientific-Research Institute of Natural Gas, USSR). U.S.S.R. SU 568450 15 Aug 1977 From: Otkrytiya, Izobret., Prom. Obraztsy, Tovarnye Znaki 1977, 54(30), 12. (Russian). (Union of Soviet Socialist Republics). CODEN: URXXAF. CLASS: IC: B01D053-00. APPLICATION: SU 74-2000142 22 Feb 1974. DOCUMENT TYPE: Patent CA Section: 59 (Air Pollution and Industrial Hygiene) H2S and SO2 were removed from gases in a liq. medium in the presence of N-methylcaprolactam [2556-73-2] with the formation of S.