摘要:
The invention pertains to a method for preparing succinic acid comprising the steps of - providing an aqueous magnesium succinate solution to an acidification step, wherein the magnesium succinate solution is acidified by the addition of hydrogen chloride, thereby obtaining an aqueous solution comprising succinic acid and magnesium chloride; - subjecting an aqueous solution comprising succinic acid and magnesium chloride derived from the acidification step to a treatment step with active carbon, - precipitating succinic acid from an aqueous mixture comprising succinic acid and magnesium chloride resulting from the active carbon treatment step in a precipitation step to form solid succinic acid and a magnesium chloride solution, - separating the solid succinic acid from the magnesium chloride solution - subjecting the magnesium chloride solution to a thermal decomposition at a temperature of at least 300°C, thereby decomposing the magnesium chloride to magnesium oxide and hydrogen chloride, and - recycling the hydrogen chloride generated in the thermal decomposition step to the acidification step. It has been found the method according to the invention leads to succinic acid crystals with better properties than a comparable method wherein no active carbon treatment is used.
摘要:
A process for producing at least one rare earth chloride from an ore containing the at least one rare earth comprises: contacting the ore containing the at least one rare earth with reactants comprising a carbonaceous reducing agent, chlorine, and a boron-containing Lewis acid in a chlorination reactor to produce a gaseous product and a non-volatile chloride mixture comprising the at least one rare earth chloride.
摘要:
The invention pertains to a method for preparing succinic acid comprising the steps of - providing an aqueous magnesium succinate solution to an acidification step, wherein the magnesium succinate solution is acidified by the addition of hydrogen chloride, thereby obtaining an aqueous solution comprising succinic acid and magnesium chloride; - subjecting an aqueous solution comprising succinic acid and magnesium chloride derived from the acidification step to a treatment step with active carbon, - precipitating succinic acid from an aqueous mixture comprising succinic acid and magnesium chloride resulting from the active carbon treatment step in a precipitation step to form solid succinic acid and a magnesium chloride solution, - separating the solid succinic acid from the magnesium chloride solution - subjecting the magnesium chloride solution to a thermal decomposition at a temperature of at least 300°C, thereby decomposing the magnesium chloride to magnesium oxide and hydrogen chloride, and - recycling the hydrogen chloride generated in the thermal decomposition step to the acidification step. It has been found the method according to the invention leads to succinic acid crystals with better properties than a comparable method wherein no active carbon treatment is used.
摘要:
The invention relates to a method for producing metal chloride M' + Cl " - , in which method metal carbonate (1) in solid form is reacted using phosgene, diphosgene and/or triphosgene (2) to form metal chloride M x+ Cl x - (1'), the metal M being selected from the group containing alkali metals, alkaline earth metals, Al and Zn, preferably Li and Mg, especially preferably Li, and x corresponding to the valency of the metal cations. The invention also relates to apparatus (R) for carrying out said method.
摘要翻译:本发明涉及生产金属氯化物M'+ Cl - - 的方法,其中使用光气,双光气和/或三光气(2)使固体形式的金属碳酸盐(1)反应以形成金属氯化物M x + Cl x - (1')中,金属M选自碱金属,碱土金属,Al和Zn,优选Li和Mg,特别优选Li,x相应于金属阳离子的化合价。 涉及用于执行所述方法的设备(R)。
摘要:
Die Erfindung betrifft ein Verfahren zur Abtrennung von Metallchloriden aus deren Suspensionen in Chlorsilanen, bei dem man die Suspension unter Luft- und Feuchtigkeitsausschluß in einer inertisierten Zone unter Druck filtriert, den Filterkuchen in einer inertisierten Zone zerkleinert und den zerkleinerten Filterkuchen einer Lösungszone zuführt, in der die Metallchloride zu einer wäßrigen Metallchlorid-Lösung gelöst werden. Die Erfindung betrifft weiterhin eine Filter- und Lösevorrichtung für dieses Verfahren sowie einen Apparat für die Einleitung des Rohgases in eine Suspension von Metallchloriden in Chlorsilanen zur Erzeugung eines Edukts für das genannte Verfahren.