Abstract:
PROBLEM TO BE SOLVED: To provide a process for acylphosphine oxides, which provides solids in a simple and cost-effective manner.SOLUTION: The present invention relates to a process for the preparation of solid acylphosphine oxides by converting an acylphosphine oxide which is in the form of a melt or in dispersed form into the solid state of aggregation with mechanical stress, shearing/internal agitation of the melt.
Abstract:
PROBLEM TO BE SOLVED: To improve a method of purifying a raw melt of at least one monomer by crystallization. SOLUTION: There is provided the method for the purification of a crude melt of at least one monomer by crystallization, in which the crude melt to be purified is subjected to a suspension crystallization, the monomer crystals produced during the suspension crystallization and suspended in the residual melt are separated from the residual melt by using a first mechanical separation operation and, in at least one further crystallization stage, the residual melt remaining after the first mechanical separation operation and/or the monomer crystals which have been separated off and if necessary washed are further purified after they have been melted, wherein the residual melt and/or the remelted monomer crystals are subjected to at least one further mechanical solid/liquid separation operation on their way into the one or more further crystallization stages. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
The present invention relates to a method for purifying a gas mixture G-0 containing nitrous oxide, comprising at least the bringing of the gas mixture G-0 into contact with a solvent mixture (I) containing at least 50% by weight of water with respect to the total solvent mixture (I), wherein the pH of the solvent mixture (I) ranges from 3.5 to 8.0, the desorption of a gas mixture G-1 from a composition (A), the bringing into contact of the gas mixture G-1 with a solvent mixture (II) containing at least 50% by weight of water with respect to the total solvent mixture (II), wherein the pH of the solvent mixture (II) ranges from 2.0 to 8.0, and the desorption of a gas mixture G-2 from a composition (B), wherein the pH in each case relates to a measurement with a glass electrode. The invention also relates to the use of gas mixtures obtained by the method according to the invention, as oxidizing agents for olefins.
Abstract:
Verfahren zur kontinuierlichen Abtrennung eines Zielproduktes X in Form von feinteiligem Kristallisat des Zielproduktes X aus einer aus dem Zielprodukt X sowie aus vom Zielprodukt X verschiedenen Bestandteilen Bibestehenden flüssigen Phase P, deren Gesamtmolenbruch an Bestandteilen Biden Wert MB,Pgesaufweist,umfassend das Betreiben eines einen Sekundärraum und wenigstens einen Primärraum aufweisenden indirekten Wärmeübertragers, bei dem der Sekundärraum und der wenigstens eine Primärraum jeweils durch wenigstens eine materielle Trennwand, die als Fläche zum Übertragen von Wärme aus dem Sekundärraum heraus in den wenigstens einen Primärraum hinein dient, räumlich voneinander getrennt sind, indem man einen Strom an flüssiger Phase P in den Sekundärraum des Wärmeübertragers hineinführt,während der wenigstens eine Primärraum gleichzeitig von wenigstens einem fluiden Kühlmedium so durchströmt wird, dass sich im Sekundärraum unter Verbleib einer flüssigen Restphase R aus der flüssigen Phase P heraus feinteiliges Kristallisat des Zielproduktes X bildet, das in der verbliebenen flüssigen Restphase R, die im Vergleich mit der flüssigen Phase P die vom Zielprodukt X verschiedenen Bestandteile mit einem Gesamtmolenbruch MB,Rges> MB,Pgesenthält und deren Gehalt an Zielprodukt X wenigstens 70 Gew.-% beträgt, unter Erhalt einer einen Kristallisationsgrad Y aufweisenden Suspension S von feinteiligem Kristallisat des Zielproduktes X in der flüssigen Restphase R, suspendiert und dem Sekundärraum des Wärmeüberträgers kontinuierlich Suspension S mit der Temperatur Tsausentnimmt undferner umfassend das Zuführen von mit der Temperatur Tsausentnommener Suspension S in einen durchmischten Pufferbehälter, sowie mit Hilfe einer Pumpe aus dem Pufferbehälter heraus das Beschicken einer Auftrennvorrichtung mit im Pufferbehälter enthaltener Suspension von feinteiligem Kristallisat des Zielproduktes X und das Auftrennen der der Auftrennvorrichtung zugeführten Suspension in darin enthaltenes Kristallisat und darin enthaltene Flüssigphase,wobei auf dem Weg vom Sekundärraum in den Pufferbehälter, im Pufferbehälter und/oder in einer oder mehreren aus dem Pufferbehälter heraus- und wieder in diesen hineinführenden Umpumpleitungen die Temperatur der dem Pufferbehälter zugeführten Suspension S mit Hilfe einer externen Energiequelle auf einen Wert TPuoberhalb von Tsausund/oder der Gesamtmolenbruch der in der flüssigen Restphase R der dem Pufferbehälter zugeführten Suspension S enthaltenen, vom Zielprodukt X verschiedenen, Bestandteile durch externen Zusatz an vom Zielprodukt X verschiedenen Bestandteilen auf einen Wert MB,Pugesoberhalb von MB,Rgeserhöht wird.
Abstract:
The invention relates to a tray for a mass transfer column, having gas passage openings distributed over the tray (1), and having at least one baffle (11) for flow diversion of liquid flowing on the tray, it being possible for the tray (1) to be fed with a liquid via at least one entry (3). The tray has at least one entry (3), at least one separating weir (5), which separates the inflowing liquid into two streams, and at least two exits (12), or has at least two entries (3) and at least one exit (12) for the liquid, each stream flowing along a flow path (7; 9) to an exit (12). The invention further relates to a mass transfer column comprising the tray, and to a use of tray and mass transfer column.
Abstract:
The present invention relates to a method for obtaining crystalline L-alanine from an aqueous solution of L-alanine, in particular from an aqueous solution of L-alanine, which is obtained from a fermentation process.
Abstract:
The present invention relates to a process for purifying a gas mixture containing dinitrogen monoxide at least comprising treatment of a gas mixture G-O containing dinitrogen monoxide with a gas mixture G-A being obtained, at least comprising the absorption of the gas mixture G-O in a solvent mixture LM-I with an off-gas stream and a composition Z-A being obtained, and desorption of a gas mixture G-1 from the composition Z-A with a solvent mixture LM-I' being obtained, subsequent condensation of the gas mixture G-A with a liquid composition Z-1 containing dinitrogen monoxide and a gaseous mixture G-K being obtained, wherein the gaseous mixture G-K is recirculated to the process.
Abstract:
The present invention relates to a method for purifying a gas mixture G-0 containing nitrous oxide, comprising at least the bringing of the gas mixture G-0 into contact with a solvent mixture (I) containing at least 50% by weight of water with respect to the total solvent mixture (I), wherein the pH of the solvent mixture (I) ranges from 3.5 to 8.0, the desorption of a gas mixture G-1 from a composition (A), the bringing into contact of the gas mixture G-1 with a solvent mixture (II) containing at least 50% by weight of water with respect to the total solvent mixture (II), wherein the pH of the solvent mixture (II) ranges from 2.0 to 8.0, and the desorption of a gas mixture G-2 from a composition (B), wherein the pH in each case relates to a measurement with a glass electrode. The invention also relates to the use of gas mixtures obtained by the method according to the invention, as oxidizing agents for olefins.
Abstract:
43 Abstract PROCESS FOR ISOLATING N20The present invention relates to a process for purifying a gas mixture comprising5 dinifrogen monoxide, at least comprising the treatmont of a gas mixture G-0 comprising dinitrogen monoxide to obtain a gas mixture G-A, at Least comprising the absorption of the gas mixture G-0 In a solvent mixture S-I to obtain an offs stream and a composition C-A, and the desorption of a gas mixture G-1 from the composition G-A to obtain a solvent mixture $-1', subsequent condensation of the gas mixture G-A to10 oblein a liquid composition C-1 comprising dinitrogen monoxide and a gaseous mixture C--K, wherein the gaseous mixture G-K is recycled into the process.No suitable figure
Abstract:
Purification of a gas mixture (G-0) comprising dinitrogen monoxide comprises: absorption of (G-0) in an organic solvent; desorption of a gas mixture (G-1) from the loaded organic solvent; absorption of (G-1) in water; and desorption of a gas mixture (G-2) from the loaded water.