摘要:
The present application concerns a process for the removal of hydrocarbons from an aqueous stream, which process may include conducting a phenol-containing water stream into a separation column, separating the phenol-containing water in the column using heat to form an overhead portion and a bottoms portion, and collecting the overhead portion as well as the bottoms portion. Further, the process may include adding an eluent to an aqueous stream, thereby forming an aqueous mixture, subsequently conducting the aqueous mixture into a separation vessel, wherein it is allowed to settle into two phases, which form a hydrocarbon stream and a phenol-containing water stream, subsequently collecting the hydrocarbon stream, and conducting the phenol-containing water stream to the separation column for further separation.
摘要:
The present invention relates to method for producing phenol comprising: a) oxidizing cumene to form an oxidation product containing cumene hydroperoxide; b) cleaving said oxidation product using an acidic catalyst to form a cleavage product containing phenol, acetone and impurities; c) neutralizing and washing said cleavage product with a basic aqueous medium to obtain a neutralized cleavage product; d) separating said neutralized cleavage product by at least one distillation step into at least a phenol containing fraction and an aqueous fraction comprising hydroxyacetone; e) treating said aqueous fraction with an oxidizing agent in presence of a base to obtain a basic aqueous medium reduced in hydroxyacetone; f) recycling at least a portion of said basic aqueous medium to the neutralizing and washing step c); and g) recovering phenol from said phenol containing fraction obtained in step d).
摘要:
The present invention relates to method for producing phenol comprising: a) oxidizing cumene to form an oxidation product containing cumene hydroperoxide; b) cleaving said oxidation product using an acidic catalyst to form a cleavage product containing phenol, acetone and impurities; c) neutralizing and washing said cleavage product with a basic aqueous medium to obtain a neutralized cleavage product; d) separating said neutralized cleavage product by at least one distillation step into at least a phenol containing fraction and an aqueous fraction comprising hydroxyacetone; e) treating said aqueous fraction with an oxidizing agent in presence of a base to obtain a basic aqueous medium reduced in hydroxyacetone; f) recycling at least a portion of said basic aqueous medium to the neutralizing and washing step c); and g) recovering phenol from said phenol containing fraction obtained in step d).
摘要:
Beansprucht wird ein Verfahren zur Verringerung des Salzgehaltes in Hochsieder aufweisenden Fraktionen, die bei der Herstellung von Phenol aus Cumol anfallen, durch Extraktion. Bei der Herstellung von Phenol aus Cumol entstehen bei der Spaltung von Cumolhydroperoxid neben Phenol und Aceton auch Nebenprodukte, wie z.B. Dimethylphenylcarbinol oder Acetophenon. Diese Nebenprodukte fallen bei der destillativen Aufarbeitung der Spaltproduktphase als Fraktion an, die erst bei hohen Temperaturen siedet. Diese Fraktionen weisen aus der der säurekatalysierten Spaltung folgenden Neutralisation mittels Natronlauge zusätzlich auch Alkali in Form von Salzen auf. Das Vorhandensein von Salz in dieser Phase erschwert die Aufarbeitung dieser Phase erheblich. Üblicherweise wird das Salz durch Extraktion der Fraktion mit Wasser aus der Fraktion entfernt. Dabei können allerdings erhebliche Probleme auftreten, wenn die wässrige Phase von der organischen Phase nicht sauber getrennt werden kann. Erfindungsgemäß wird den Hochsieder aufweisenden Fraktionen zur Extraktion nicht nur eine saure wässrige Phase sondern auch eine organische Flüssigkeit hinzugefügt. Auf diese Weise wird die anschließende Phasentrennung begünstigt und beschleunigt. Die zu den Hochsieder aufweisenden Fraktionen hinzugegebene organische Flüssigkeit kann durch einfache Destillation von den behandelten Fraktionen wieder entfernt und direkt zur Verdünnung wieder eingesetzt werden. Durch das erfindungsgemäße Verfahren wird weiterhin der Phenolgehalt in den Hochsieder aufweisenden Fraktionen erniedrigt und Phenol zurückgewonnen. Erfindungsgemäß behandelte, Hochsieder aufweisende Fraktionen können als Ausgangsmaterial zur Herstellung von Ruß verwendet werden.
摘要:
A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separating the aqueous and organic phases, washing the resulting organic phase with water, and then subjecting the water-washed organic phase to distillation in an inert environment to recover purified DIP. Since only one distillation is required rather than two, the development of impurities in the DIP caused by in situ oxidation reactions at elevated temperatures due to the inevitable presence of traces of air in commercial distillation facilities is reduced to acceptable levels.
摘要:
Process for the extraction of the salts contained in the neutralized separated product obtained in the preparation of phenol by the oxidation of cumene, wherein the flow-rate of the aqueous stream of the separation section of cumene hydroperoxide is reduced by substituting the stream of fresh water used for washing the neutralized separated product, generally obtained by the demineralization of well or running water, with process water taken from another section of the production plant.
摘要:
A process for purifying impure 2,6-diisopropylphenol (DIP) mixtures having lower and higher boiling phenolic impurities is described. The process involves washing the mixture with aqueous alkali metal hydroxide solution in an inert atmosphere and separating the aqueous and organic phases, washing the resulting organic phase with water, and then subjecting the water-washed organic phase to distillation in an inert environment to recover purified DIP. Since only one distillation is required rather than two, the development of impurities in the DIP caused by in situ oxidation reactions at elevated temperatures due to the inevitable presence of traces of air in commercial distillation facilities is reduced to acceptable levels.
摘要:
Die Erfindung betrifft ein Verfahren zur Reinigung von p,p-Bisphenolat-Lösungen, wie sie bei der Herstellung von Bisphenolaten erhalten werden aus Natronlauge und Bisphenolen durch Extraktion.