Abstract: The invention relates to a process for separating off ethylene from a gas mixture comprising more than 8% by volume of carbon dioxide or oxygen, by gas permeation.

Abstract: The invention relates to a process for preparing carbonyl compounds from olefins and an oxidizing agent in which the olefin is oxidized in a reactor, a reaction gas mixture which comprises unoxidized olefin being formed, which comprises separating off unoxidized olefin at least in part from the reaction gas mixture by a membrane process.

Abstract: The invention relates to a process for preparing carbonyl compounds from olefins and an oxidizing agent in which the olefin is oxidized in a reactor, a reaction gas mixture which comprises unoxidized olefin being formed, which comprises separating off unoxidized olefin at least in part from the reaction gas mixture by a membrane process.

Abstract: A method of disposing of salt-containing dusts from incinerator plants by mixing salt-containing dusts, having approximately 1% or less of lime with cement and water. The amount of cement in the mixture is between 3% and 25% of the total mixture. The amount of hydrothermally reactive powdered components is not less than 8% of the total mixture. The mixture is compacted into discrete compacts, and hardened in an autoclave by saturated steam with a pressure of at least 1 bar to form stable compacts.

Abstract: For the disposal of salt-containing dusts of incinerator plants, with addition of water the salt-containing dusts are intensively mixed with other waste materials, such as ashes and fly ashes from thermal power plants fired with hard coal or brown coal, waste materials from foundries containing quartz sands and waste materials from calcium carbide production, the mixture containing at least 8% hydrothermally reactive calcium oxide or equivalent amounts of other hydrothermally reactive calcium compounds and the water addition being so rated that an optimum compacting is possible and the mixture is thereafter processed by compacting to give stable firm compacts and the compacts subsequently hardened in an autoclave by saturated steam at a pressure of at least 1 bar.

Abstract: The invention relates to improving the degree of graphitization of carbon black produced by subjecting hydrocarbons which are liquid or gaseous under normal conditions to a thermal conversion reaction in the presence of oxygen or an oxygen-containing gas and steam, if desired, at temperatures of 1200.degree. to 2000.degree. C. and pressures of 1 to 80 bars. To this end, the carbon black is conveyed downwardly in a quasi-fluid state, within 1 to 5 hours through a sojourn zone in upright position, the sojourn zone being maintained at a temperature of at least 1200.degree. C.

Abstract: The disclosure relates to a process for the discontinuous separation of a solid consisting predominantly of carbon black from its aqueous suspension by filtration. To this end, the disclosure provides for use to be made of a tube pressure filter which is operated under a final pressure of 30 to 100 bars.

Abstract: The invention relates to a process for removing carbon black from an aqueous suspension obtained by washing a gas containing carbon black with water. To this end, a gas stream comprising hydrocarbons and at least one inert gas is introduced into a suspension having a solids content of from 0.5 to 4% by weight, at a temperature of from 10.degree. to 80.degree. C. In so doing, the carbon black agglomerates and collects on the surface of the suspension water from which it is separated, for example by skimming it off. The gas stream is produced by passing inert gas over the separated carbon black containing the hydrocarbons and heated to 200.degree. to 400.degree. C., the carbon black being converted into a dry, free-flowing material.

Abstract: The invention relates to a process for the removal of metals, especially of iron and/or nickel and/or vanadium or their compounds, from carbon black. To this end, the invention provides for an aqueous carbon black suspension to be heated to a temperature of about 30.degree. to 90.degree. C., for chlorine to be passed therethrough with agitation. The chlorine gas is used in a stoichiometric excess, based on the metal content of the aqueous carbon black suspension. Next, the carbon black is separated from the aqueous suspension and dried.