摘要:
The invention relates to a method for obtaining formic acid by thermal separation of a stream containing formic acid and a tertiary amine (I), according to which method a liquid stream containing formic acid, methanol, water and tertiary amine (I) is produced in step (a) by bringing together methyl formate, water and tertiary amine (I), methanol is removed therefrom in step (b), and in step (c) formic acid is removed by distillation from the obtained liquid stream in a distillation device, wherein, when bringing together methyl formate, water and tertiary amine (l), methyl formate, water and optionally tertiary amine (I) are initially supplied in step (a1) in a molar ratio of 0 ≤ n(amine to a1) / n(methyl formate to a1) ≤ 0.1 and 70 to 100% of the possible hydrolysis equilibrium is adjusted, and subsequently in step (a2) tertiary amine (I) is supplied in a molar ratio of 0.1 ≤ n(amine to a2) / n(methyl formate to a1) ≤ 2 and the mixture is reacted.
摘要:
A continuous process for the production of propylene oxide comprising reacting propene with hydrogen peroxide in methanolic solution in the presence of a titanium silicalite-1 catalyst to obtain propylene oxide, wherein a reaction feed comprising propene, methanol and hydrogen peroxide is introduced into a reactor, said reaction feed containing potassium cations and phosphorus in the form of anions of at least one phosphorus oxyacid.
摘要:
The invention relates to a method for catalytically reacting an organic compound with a hydroperoxide in at least one reactor while using at least two zeolite catalysts that differ from one another. The invention is characterized in that at least two of the different zeolite catalysts are used while being spatially separated from one another.
摘要:
The invention relates to a method for continuously returning an olefin which has not been reacted with hydroperoxide in order to form oxiranes during the oxidation of olefins. Said olefin is contained in the flow of waste gas which is produced during oxidation. Said method is characterised by the following steps: (i) separating the olefin from the flow of waste gas by absorption in a hydrocarbon, (ii) desorption of the olefin from the hydrocarbon, (iii) returning the olefin obtained in step (ii) into the oxidation process.
摘要:
The invention relates to a method for the production of propylene oxide in the presence of methanol, during which propylene oxide is separated off from a mixture, comprising propylene oxide and methanol and the resulting mixture comprising methanol is worked up. The invention is characterised in that on working up, methanol is separated from a mixture containing methanol and methyl formate.
摘要:
The present invention provides a process for the epoxidation of propene which comprises reacting propene with hydrogen peroxide in the presence of methanol as solvent and a titanium zeolite catalyst, the process further comprising separating propylene oxide from the reaction mixture to obtain a mixture comprising methanol, water, at least one carboxylic acid and at least one carbonyl compound, wherein the at least one carboxylic acid is at least partially neutralized, said process optionally comprising a hydrogenation stage.
摘要:
The invention relates to a method for the extractive separation of homogeneously dissolved catalysts from a reaction product from a hydrocyanation of unsaturated mononitriles to dinitriles, by extraction with a carbon material (K), characterised in that a) a non-polar aprotic liquid (F) is added to the reaction product to give a stream (I) and b) the stream (I) is extracted with a carbon material (K) at a temperature (T), to give a stream (II), containing the carbon material (K), enriched with the catalyst and a stream (III), stripped of catalyst.
摘要:
A continuous process for the preparation of propylene oxide, comprising (i) providing a liquid feed stream comprising propene, hydrogen peroxide, acetonitrile, water, optionally propane, and at least one dissolved potassium salt of a phosphorus oxyacid wherein the molar ratio of potassium relative to phosphorus in the at least one potassium salt of a phosphorus oxyacid is in the range of from 0.6 to 1.4; (ii) passing the liquid feed stream provided in (i) into an epoxidation reactor comprising a catalyst comprising a titanium zeolite of structure type MWW comprising zinc, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation reactor, obtaining a reaction mixture comprising propylene oxide, acetonitrile, water, the at least one dissolved potassium salt of a phosphorus oxyacid, optionally propene, and optionally propane; (iii) removing an effluent stream from the epoxidation reactor, the effluent stream comprising propylene oxide, acetonitrile, water, at least a portion of the at least one dissolved potassium salt of a phosphorus oxyacid, optionally propene, and optionally propane.