Abstract: The invention relates to a method for producing C2-C4 olefins from methanol and ethanol, said method having the steps of: A) feeding a methanol- and optionally ethanol-containing feed flow A into a dimethyl ether fixed-bed reactor and catalytically reacting methanol to form dimethyl ether, wherein a product flow A1 containing dimethyl ether, methanol, ethanol and steam is obtained; B) mixing the flow A1 with at least one hydrocarbon return flow R containing C2-C6 hydrocarbons and catalytically reacting the mixture in an olefin fixed-bed reactor to form a raw product flow B containing C2-C4 olefins, C5-C6 hydrocarbon and C7+ hydrocarbons; C) cooling the raw product flow B, wherein a hydrocarbon raw product flow C is obtained; D) separating the hydrocarbon raw product flow C in a propylene-containing value product flow, optionally an ethylene-containing value product flow, a butene-containing value product flow, at least one C5-C6 hydrocarbon-containing return flow and at least one C6+ hydrocarbon-containing au

Abstract: A process for producing a synthesis gas mixture comprising hydrogen and carbon monoxide by noncatalytic partial oxidation of hydrocarbons in the presence of oxygen and carbon dioxide, in which at least one reactant gas comprising hydrocarbons, an oxygen-comprising reactant gas and a carbon dioxide-comprising reactant gas are fed into a partial oxidation reactor and reacted at a temperature in the range from 1200 to 1550° C. to give a product gas mixture comprising water, carbon monoxide and carbon dioxide, at least by separating a portion of the carbon dioxide from the product gas mixture and recycling it into the partial oxidation reactor, wherein the carbon dioxide fed into the partial oxidation reactor comprises additional imported carbon dioxide, giving a product gas mixture in the partial oxidation reactor that has a molar ratio of hydrogen to carbon monoxide in the range from 0.8:1 to 1.6:1.

Abstract: Enolic monoether and diether of adipic dialdehyde such as 6-methoxy-5-hexene-1-al, 1,6-dimethoxy-1,5-hexadiene, 1,6-bis-(2 hydroxy propoxy)-1,5-hexadiene are prepared by heating to a sufficiently high temperature for a Cope rearrangement, e.g., 150.degree. to 450.degree. C. of the corresponding monoether or diether of 1,5-hexadiene-3,4-diol.