Abstract: The present invention is related to a process for preparing propylene oxide, comprising (i) providing a stream comprising propene, hydrogen peroxide or a source of hydrogen peroxide, water, and an organic solvent; (ii) passing the liquid feed stream provided in (i) into an epoxidation zone comprising an epoxidation catalyst comprising a titanium zeolite, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation zone, obtaining a reaction mixture comprising propene, propylene oxide, water, and the organic solvent; (iii) removing an effluent stream from the epoxidation zone, the effluent stream comprising propylene oxide, water, organic solvent, and propene; (iv) separating propene from the effluent stream by distillation, comprising (iv.

Abstract: Disclosed herein is a process for purifying propylene oxide, including the steps of: (i) providing a stream S0 containing propylene oxide, acetonitrile, water, and an organic compound containing a carbonyl group —C(?O)—; and (ii) separating propylene oxide from the stream S0 by subjecting the stream S0 to distillation conditions in a distillation column to obtain a gaseous top stream S1c which is enriched in propylene oxide compared to the stream S0, a liquid bottoms stream S1a which is enriched in acetonitrile and water compared to the stream S0, and a side stream S1b containing propylene oxide which is enriched in the carbonyl compound compared to the stream S0.

Abstract: The present invention relates to a process for the production of a boron-containing zeolitic material having an MWW framework structure comprising YO2 and B2O3, wherein Y stands for a tetravalent element, wherein said process comprises (a) providing a mixture comprising one or more sources for YO2, one or more sources for B2O3, one or more organotemplates, and seed crystals, (b) crystallizing the mixture obtained in (a) for obtaining a layered precursor of the boron-containing MWW-type zeolitic material, (c) calcining the layered precursor obtained in (b) for obtaining the boron-containing zeolitic material having an MWW framework structure, wherein the one or more organotemplates have the formula (I) R1R2R3N??(I) wherein R1 is (C5-C8)cycloalkyl, and wherein R2 and R3 are independently from each other H or alkyl, as well as to a synthetic boron-containing zeolite which is obtainable and/or obtained according to the inventive process as well as to its use.

Abstract: A continuous process for preparing propylene oxide proceeds by (a) reacting propene with hydrogen peroxide in a reaction apparatus in the presence acetonitrile as solvent, obtaining a stream S0 containing propylene oxide, acetonitrile, water, at least one further component B; (b) separating propylene oxide from S0, obtaining stream S1 containing acetonitrile, water and B; (c) dividing S1 into streams S2 and S3; (d) subjects S3 to vapor-liquid fractionation in a first fractionation unit, obtaining vapor fraction stream S4a being depleted, relative to S3, of at least one of B and obtaining liquid bottoms stream S4b, and subjecting at least part of vapor fraction stream S4a to vapor-liquid fractionation in a second fractionation unit, obtaining vapor fraction stream S4c and liquid bottoms stream S4 being depleted, relative to S4a, of at least one of B; (e) recycling at least a portion of S4 to (a).

Abstract: The present invention is related to a process for preparing propylene oxide, comprising (i) providing a stream comprising propene, hydrogen peroxide or a source of hydrogen peroxide, water, and an organic solvent; (ii) passing the liquid feed stream provided in (i) into an epoxidation zone comprising an epoxidation catalyst comprising a titanium zeolite, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation zone, obtaining a reaction mixture comprising propene, propylene oxide, water, and the organic solvent; (iii) removing an effluent stream from the epoxidation zone, the effluent stream comprising propylene oxide, water, organic solvent, and propene; (iv) separating propene from the effluent stream by distillation, comprising (iv.

Abstract: A process for preparing an arylpropene from a diarylpropane by gas phase thermolysis in the presence of solid porous catalyst comprising silica having large pore volume and low acidity.

Abstract: A process for the preparation of a zeolitic material having an MWW framework structure and comprising boron and titanium, the process comprising (i) providing an aqueous synthesis mixture comprising a silica source, a boron source, a titanium source, and an MWW templating agent; (ii) heating the aqueous synthesis mixture to a temperature in the range of from 160 to 190 ° C.; (iii) subjecting the synthesis mixture (ii) to hydrothermal synthesis conditions, obtaining, in its mother liquor, a precursor of the zeolitic material; (iv) separating the precursor from its mother liquor; (v) calcining the separated precursor, obtaining the zeolitic material having an MWW framework structure and comprising boron and titanium.

Abstract: The present invention relates to a process for the preparation of a zeolitic material comprising the steps of: (1) providing a mixture comprising one or more sources for YO2 and one or more alkenyltrialkylammonium cation R1R2R3R4N+-containing compounds as structure directing agent; and (2) crystallizing the mixture obtained in step (1) to obtain a zeolitic material; wherein Y is a tetravalent element, and wherein R1, R2, and R3 independently from one another stand for alkyl; and R4 stands for alkenyl, as well as to zeolitic materials which may be obtained according to the inventive process and to their use.

Abstract: A continuous process for the preparation of propylene oxide, comprising a start-up stage and normal run stage, wherein the normal run stage comprises (i) continuously providing a liquid feed stream comprising propene, hydrogen peroxide, acetonitrile, a formate salt, water and optionally propane, wherein in the liquid feed stream, the molar amount of the formate salt relative to the molar amount of hydrogen peroxide at a given point of time during the normal run stage is aN(Fo/H2O2); (ii) continuously passing the liquid feed stream provided in (i) into an epoxidation zone comprising a catalyst comprising a titanium zeolite having framework type MWW, and subjecting the liquid feed stream to epoxidation reaction conditions in the epoxidation zone, obtaining a reaction mixture comprising propylene oxide, acetonitrile, water, the formate salt, optionally propene, and optionally propane; (iii) continuously removing an effluent stream from the epoxidation zone, the effluent stream comprising propylene oxide, acetoni

Abstract: A process for preparing 2,6-dimethyl-5-heptenal, comprising oxidizing citral of which more than 50% are present as geranial with hydrogen peroxide in the presence of a catalyst comprising a Baeyer-Villiger oxidation catalyst, preferably a tin-containing molecular sieve.

Abstract: A process for preparing an arylpropene from a diarylpropane by gas phase thermolysis in the presence of boron containing zeolitic material comprising a membered ring (MR) pore system greater than 10 MR.

Abstract: The present invention relates to a process for the production of a boron-containing zeolitic material having an MWW framework structure comprising YO2 and B2O3, wherein Y stands for a tetravalent element, wherein said process comprises (a) providing a mixture comprising one or more sources for YO2, one or more sources for B2O3, one or more organotemplates, and seed crystals, (b) crystallizing the mixture obtained in (a) for obtaining a layered precursor of the boron-containing MWW-type zeolitic material, (c) calcining the layered precursor obtained in (b) for obtaining the boron-containing zeolitic material having an MWW framework structure, wherein the one or more organotemplates have the formula (I): R1R2R3N, wherein R1 is (C5-C8)cycloalkyl, and wherein R2 and R3 are independently from each other H or alkyl, as well as to a synthetic boron-containing zeolite which is obtainable and/or obtained according to the inventive process as well as to its use.

Abstract: The invention relates to process for the regeneration of a catalyst comprising a titanium containing zeolite as catalytically active material comprising a stage comprising introducing a feed stream comprising propene, hydrogen peroxide or a hydrogen peroxide source, and an organic solvent into a reactor containing a catalyst comprising the titanium containing zeolite, subjecting the feed stream in the reactor to epoxidation conditions in the presence of the catalyst, removing a product steam comprising propylene oxide and the organic solvent from the reactor, stopping introducing the feed stream, washing the catalyst with a liquid aqueous system and calcining the washed catalyst.

Abstract: A process for the post-treatment of a zeolitic material having a BEA framework structure, the process comprising (i) providing a zeolitic material having a BEA framework structure, wherein the framework structure of the zeolitic material comprises X2O3 and YO2, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio X2O3:YO2 is greater than 0.02:1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio X2O3:YO2 of at most 0.02:1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75° C.

Abstract: A process for preparing a tin-containing zeolitic material having framework type BEA, comprising providing an aqueous synthesis mixture comprising a boron source, a silicon source, and a BEA structure directing agent; subjecting the synthesis mixture provided in to hydrothermal pre-crystallization conditions; adding the tin source to the obtained mixture; subjecting the obtained aqueous synthesis mixture to hydrothermal crystallization conditions, obtaining a tin-containing zeolitic material having framework type BEA comprised in its mother liquor.

Abstract: An incipient wetness impregnation method for preparing a tin-containing zeolitic material having framework type BEA, a novel tin-containing zeolitic material having framework type BEA and its use.

Abstract: A process for preparing an aluminum-free boron containing zeolitic material comprising the framework structure MWW (BMWW), comprising (a) hydrothermally synthesizing the BMWW from a synthesis mixture containing water, a silicon source, a boron source, and an MWW template compound obtaining the BMWW in its mother liquor, the mother liquor having a pH above 9; (b) adjusting the pH of the mother liquor, obtained in (a) and containing the BMWW, to a value in the range of from 6 to 9; (c) separating the BMWW from the pH-adjusted mother liquor obtained in (b) by filtration in a filtration device.

Abstract: A process for the oxidation of an organic carbonyl compound comprising reacting the compound, optionally in the presence of a solvent, with hydrogen peroxide in the presence of a catalyst comprising a tin-containing zeolitic material and at least one potassium salt.

Abstract: A process for the post-treatment of a zeolitic material having an MWW framework structure, the process comprising (i) providing a zeolitic material having an MWW framework structure, wherein the framework structure of the zeolitic material comprises X2O3 and YO2, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio X2O3:YO2 is greater than 0.02:1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio X2O3:YO2 of at most 0.02:1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75° C.

Abstract: A catalytic system containing a titanium zeolite of structure type MWW optionally containing zinc and containing at least one of an inorganic potassium salt and an organic potassium salt is provided. The catalyst system is useful in the preparation of propylene oxide.