Abstract: Fuels for gasoline engines, which contain small amounts of(a) imides or amide-imides, or mixtures of imides and amide-imides, obtained from nitrilotriacetic acid and/or from ethylenediaminetetraacetic acid and amines or amine mixtures of 7 to 18 carbon atoms, of the formula I ##STR1## where the radicals X are identical or different radicals --HN--R, or adjacent radicals X are a radical ##STR2## which completes a ring ##STR3## m is 0 or 1 and R is an unbranched or branched aliphatic radical of 7 to 18 carbon atoms, as valve and carburetor cleaners, and(b) mixtures of highly hydrogenated petroleum distillates, in the boiling range of the kerosine fraction and highly refined solvent raffinates with viscosities of from 50 to 500 mm.sup.2 /s at 40.degree. C., the weight ratio of these constituents being from 20:80 to 80:20, keep the carburetors and valves of gasoline engines clean, thereby achieving better combustion of the fuel in the engine.

Abstract: A process for the regeneration of a granular, supported catalyst of boric acid on carbon, wherein a part of the catalyst is removed from a fluidized bed reactor, in which cyclohexanone oxime is rearranged into caprolactam on this catalyst, when the "differential content in the catalyst of organic nitrogen" is between 0.3 and 2.0% by weight and is replaced by an equal amount of regenerated catalyst so that the differential organic nitrogen content remains in the above-mentioned range, the quantity of catalyst removed is regenerated with air in a fluidized bed at a temperature of from 400.degree. to 700.degree. C. and is returned to the fluidized bed reactor used for rearrangement when a further part of the catalyst is removed therefrom for regeneration.

Abstract: A process for the production of .epsilon.-caprolactum from cyclohexanone oxime by rearrangement in the gaseous phase on a fluid-bed catalyst containing boron oxide, wherein residues from the distillation of cyclohexanone oxime are introduced into the reaction in liquid form, and wherein from 5 to 500 times their quantity of cyclohexanone oxime in vapor form and at least 50 times their quantity of inert gas are present during the reaction.

Abstract: A process for the evaporation of cyclohexanone oxime, wherein the cyclohexanone oxime is evaporated in the presence of an inert gas at a superatmospheric pressure of at least 300 Torr at 110.degree. to 160.degree. C, the evaporation temperature being governed by the inert gas pressure or by the ratio of cyclohexanone oxime to inert gas.