Abstract:
A process for avoiding fouling in separating hydrocarbon mixtures containing unsaturated hydrocarbons at elevated temperatures using selective solvents in the presence of antifouling agents wherein a N-substituted N-nitrosohydroxylamine of the general formula
Abstract:
PRODUCTION OF PURE CONJUGATED C4 AND C5 DIOLEFINS FROM HYDROCARBON MIXTURES CONTAINING THE SAME BY EXTRACTIVE DISTILLATION, COUNTERCURRENT GAS SCRUBBING, LIQUIDLIQUID EXTRACTION OR COUNTERCURRENT DISTILLATION OR A COMBINATION OF TWO OR MORE OF THESE METHODS USING AS THE SELECTIVE SOLVENT A MIXTURE OF: (A) FROM 5 TO 95% BY WEIGHT OF AN N-ALKYLPYRROLIDONE WHICH MAY CONTAIN AN INERT SUBSTITUTENT; AND (B) FROM 5 TO 95% BY WEIGHT OF A N-HYDROXYALKYL COMPOUND I OF THE GENERAL FORMULA:
HO-R-N IN WHICH Y IS ALKYLENE OR ALKENYL OR TWO OR THREE CARBON ATOMS OR AN O-PHENYLENE WHICH MAY BE WHOLLY OR PARTLY HYDROGENATED; R IS LINEAR OR BRANCHED ALKYLENE; AND Z IS OXYGEN OR TWO HYDROGENS, AND WHICH MAY CONTAIN AN INERT SUBSTITUENT.
Abstract:
Recovery of pure 1,4-dicyanobutenes from 1,4-dicyanobutenes containing halogen, particularly chlorine or bromine, by treatment with a hexamethylenediamine or with dihexamethylenetriamine in the liquid phase and separation of the 1,4-dicyanobutenes from the reaction products of the added hexamethylenediamine with the halogen compound.
Abstract:
Production of aliphatic and cycloaliphatic Alpha -nitroketones in liquid phase by reaction of the corresponding ketones with concentrated nitric acid whose water content is less than 5.0 percent by weight. In principle all aliphatic and cycloaliphatic ketones can be nitrated according to the invention. Examples are diethyl ketone, cyclohexanone and cyclododecanone.