Abstract:
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 MVVW 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.
Abstract:
A continuous process for the preparation of propylene oxide, comprising(a) reacting propene, optionally admixed with propane, with hydrogen peroxide in a reaction apparatus in the presence of acetonitrile as solvent, obtaining a stream S0 containing propylene oxide, acetonitrile, water, at least one further component B, optionally propene and optionally propane, wherein the normal boiling point of the at least one component B is higher than the normal boiling point of acetonitrile and wherein the decadic logarithm of the octanol-water partition coefficient (log K ow ) of the at least one component B is greater than zero; (b) separating propylene oxidefrom S0, obtaining a stream S1 containing acetonitrile, water and the at least one further component B; (c) dividing S1 into two streams S2 and S3;(d) subjecting S3 to a vapor-liquid fractionation in a fractionation unit, obtaining a vapor fraction stream S4 being depleted of the at least one component B; (e) recycling at least a portion of S4, optionally after work-up, to (a).
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 YO 2 and one or more alkenyltrialkylammonium cation R 1 R 2 R 3 R 4 N + -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 R 1 , R 2 , and R 3 independently from one another stand for alkyl; and R 4 stands for alkenyl, as well as to zeolitic materials which may be obtained according to the inventive process and to their use.
Abstract translation:本发明涉及一种制备沸石材料的方法,包括以下步骤:(1)提供包含一种或多种YO 2源和一种或多种烯基三烷基铵阳离子R 1 R 2 R 3 R 4 N +化合物作为结构导向剂的混合物; 和(2)使步骤(1)中获得的混合物结晶以获得沸石材料; 其中Y是四价元素,并且其中R 1,R 2和R 3彼此独立地代表烷基; 并且R4代表烯基,以及可以根据本发明方法获得的沸石材料及其用途。
Abstract:
The present invention relates to a polymer comprising the following monomers in polymerized form (in weight %): A) 49 - 60 % of a first monomer which is selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, C3-alkyl acrylate, C3-alkyl methacrylate, C4-alkyl acrylate, C4-alkyl methacrylate and mixtures thereof, B) 30 - 40 % methacrylic acid, C) 4 -15 % acrylic acid, and D) 0.02-0.30 % of a crosslinking agent which is a compound having at least two allyl moieties, wherein the sum of the amounts of monomers A to D is 100 %. Furthermore, the present invention relates to a hair styling composition comprising the polymer and to the use of the polymer or of the hair styling composition for styling hair.
Abstract:
The present invention relates to a micropowder, wherein the particles of the micropowder have a Dv10 value of at least 2 micrometer and the micropowder comprises mesopores which have an average pore diameter in the range of from 2 to 50 nm and comprise, based on the weight of the micropowder, at least 95 weight-% of a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc.
Abstract:
The present invention relates to a method for making a copolymer comprising polymerizing the monomers in a solution comprising the monomers and a solvent, wherein the solvent comprises water and an alcohol. Furthermore, the present invention relates to the copolymer obtainable by this method ("the copolymer according to the present invention") and to the use of the copolymer according to the present invention for styling or for fixing human hair. Furthermore, the present invention relates to the use of a more generally defined copolymer for styling or for fixing human hair, and for providing high gloss to the hair that is styled or fixed.
Abstract:
Verfahren zur Herstellung von Epoxiden der Formel (I) worin R für eine organische Gruppe mit 1 bis 10 C-Atomen steht, durch Umsetzung von Verbindungen der Formel (II) mit einem Oxidationsmittel, dadurch gekennzeichnet, dass die Herstellung kontinuierlich in einem Rohreaktor erfolgt.
Abstract:
A process for the preparation of 2-oxo-[1,3] dioxolane-4-carboxylic acid esters of formula (I) with R being an organic group comprising 1 to 10 carbon atoms, wherein an oxirane-2-carboxylic acid ester of formula (II) is reacted with carbon dioxide (CO 2 ) at a pressure of at least 35 bars and a temperature of 60 to 80°C.
Abstract:
The present invention relates to A process for the production of a molding, comprising (I) providing a zeolitic material; (II) mixing the zeolitic material provided in step (I) with one or more binders; (III) kneading of the mixture obtained in step (II); (IV) molding of the kneaded mixture obtained in step (III) to obtain one or more moldings; (V) drying of the one or more moldings obtained in step (IV); and (VI) calcining of the dried molding obtained in step (V); wherein the zeolitic material provided in step (I) displays a water adsorption ranging from 1 to 15 wt.-% when exposed to a relative humidity of 85%, as well as to a molding obtainable or obtained according to the inventive process in addition to a molding per se and to their respective use.
Abstract:
The present invention relates to a process for the regeneration of a catalyst comprising a titanium-containing zeolite, said catalyst having been used in a process for the preparation of an olefin oxide and having phosphate deposited thereon, said process for the regeneration comprising the steps: (a) separating the reaction mixture from the catalyst, (b) washing the catalyst obtained from (a) with liquid aqueous system; (c) optionally drying the catalyst obtained from (b) in a gas stream comprising an inert gas at a temperature of less than 300 °C; (d) calcining the catalyst obtained from (c) in a gas stream comprising oxygen at a temperature of at least 300 °C.