Reference

Separation of debutanized C5-hydrocarbons by extractive distillation

Separation of debutanized C5-hydrocarbons by extractive distillation. Mihalcescu, Misu (Combinatul Petrochimic, Brazi, Rom.). Rom. RO 82233 B 30 Jul 1983, 4 pp. (Romanian). (Romania). CODEN: RUXXA3. CLASS: IC: C10G021-12; C10G007-08. APPLICATION: RO 81-104118 25 Apr 1981. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Section cross-reference(s): 45, 51 Debutanized C5 hydrocarbon fractions are sepd. by extractive distn., using a solvent comprising 75-80% DMF [68-12-2] and 20-25% toluene [108-88-3]. Thus, a C5 hydrocarbon fraction (316.89 kg/h) comprising C3-4 hydrocarbons 0.0004, isopentane [78-78-4] 68.20, pentane-pentene 0.60, 2-methyl-1-butene (I) [563-46-2] 3.50, 2-methyl-2-butene (II) [513-35-9] 12.04, 1,3-pentadiene (III) 0.30, isoprene [78-79-5] 14.12, and cyclopentadiene (IV) 0.18% was fractionated on a 77-plate column (reflux ratio 1:1) by using a toluene-DMF mixt. The distillate (207.90 kg/h) comprised C3-4 hydrocarbons 0.07, isopentane 99.35, pentane-pentene 0.22, I 0.21, and II 0.003%. In a 2nd 10-plate column, the solvent was sepd. from a conc. comprising isoprene 41.0, II 34.98, I 9.76, pentane-pentene 1.55, isopentene 8.34, III 3.77, and IV 0.52%. The solvent was recycled to the 1st column and the hydrocarbon fraction was subjected to further fractionation and isoprene manuf.

Aliphatic branched olefin dioxolanes, dithiolanes, and oxathiolanes and their uses in augmenting or enhancing the aroma and/or taste of consumable materials

Aliphatic branched olefin dioxolanes, dithiolanes, and oxathiolanes and their uses in augmenting or enhancing the aroma and/or taste of consumable materials. Boden, Richard M. (International Flavors and Fragrances Inc. , USA). U.S. US 4471789 A 18 Sep 1984, 56 pp. Cont.-in-part of U.S. 4,315,952. (English). (United States of America). CODEN: USXXAM. CLASS: IC: A24B003-12; A24B015-30. NCL: 131276000. APPLICATION: US 81-329217 10 Dec 1981. PRIORITY: US 80-212993 4 Dec 1980. DOCUMENT TYPE: Patent CA Section: 17 (Food and Feed Chemistry) Section cross-reference(s): 62, 63 Compds. of the general formula I, where R1 is C1-C3 alkyl, R2-R5 are the same or different H or C1-C3 alkyl, X and Y are O and (or) S, and the dashed lines are single or double C-C bonds, may be used as flavor or odor enhancers for food, tobacco, pharmaceuticals, cosmetics, and the like. Thus, 2-methyl-2-butene [513-35-9] was pumped through a tube packed with polystyrene sulfonic acid which catalyzed the formation of a mixt. of diisoamylene isomers from the 2-methyl-2-butene. The isomer mixt. was then reacted with Ac2O [108-24-7] and then with ethylene glycol [107-21-1] to form a mixt. of acetyl diisoamylene ethylene ketals. The latter mixt. improved the flavor of a cola beverage when added at 0.3 ppm.