摘要:
A method for enhancing the selectivity of the decomposition of dicumyl peroxide to alpha methyl-styrene, phenol and acetone in the presence of an acidic catalyst comprises carrying out the decomposition at a temperature of from about 80 to 110 o C. A method for preparing phenol and acetone from the decomposition of CHP with an acidic catalyst comprises (a) decomposing CHP at a specific acidic catalyst concentration and temperature thereby forming a composition comprising phenol, acetone and dicumyl peroxide, (b) transferring dicumyl peroxide to a plug flow reactor wherein decomposition of dicumyl peroxide to phenol, acetone and AMS occurs at a lower acidic catalyst concentration and a higher temperature than the catalyst concentration and temperature in step (a).
摘要:
A method for enhancing the selectivity of the decomposition of dicumyl peroxide to alpha methyl-styrene, phenol and acetone in the presence of an acidic catalyst comprises carrying out the decomposition at a temperature of from about 80 to 110 o C. A method for preparing phenol and acetone from the decomposition of CHP with an acidic catalyst comprises (a) decomposing CHP at a specific acidic catalyst concentration and temperature thereby forming a composition comprising phenol, acetone and dicumyl peroxide, (b) transferring dicumyl peroxide to a plug flow reactor wherein decomposition of dicumyl peroxide to phenol, acetone and AMS occurs at a lower acidic catalyst concentration and a higher temperature than the catalyst concentration and temperature in step (a).
摘要:
A method for producing phenol and acetone in a multi-stage process at an elevated temperature from a cumene hydroperoxide mixture comprising cumene, comprises the steps of: a) distilling an amount of cumene from the cumene hydroperoxide mixture until the cumene mass % is 0 to 7 mass % relative to the total mass of the cumene hydroperoxide mixture, b) reacting the cumene hydroperoxide mixture with an acid catalyst form to a second mixture comprising phenol, acetone and dicumyl peroxide in a first stage, and c) decomposing the second mixture in a second stage to produce phenol and acetone, wherein an amount of phenol approximately equal to the amount of distilled from the cumene hydroperoxide mixture is added to the cumene hydroperoxide mixture before the reacting step b). The amount of hydroxyacetone is reduced, thereby, improving the quality of commercial-grade phenol and the products made from the phenol.
摘要:
A method for the production of phenol and acetone from a cumene hydroperoxide mixture comprises a first stage and a second stage and at least two serially connected reactors, wherein the first stage comprises decomposition of a cumene hydroperoxide mixture in the presence of a catalyst mixture to form a dicumyl peroxide mixture, and the second stage comprises formation of a phenol and acetone mixture from decomposition of the dicumyl peroxide mixture formed in the first stage, wherein, the first stage further comprises: a) forming a catalyst mixture by combining sulfuric acid and phenol in a weight ratio of from 2: 1 to 1 : 1000 in a catalyst formation reactor, b) holding the catalyst mixture in the catalyst formation reactor at a temperature of about 20 to 8OoC for about 1 to 600 minutes; and, c)adding the catalyst mixture to the cumene hydroperoxide mixture to form the phenol and acetone mixture. The proposed method permits a significant reduction in the yield of hydroxyacetone that causes deterioration in the quality of commercial phenol.
摘要:
Verbessertes Verfahren zur Oxidation von organischen Substraten mittels 1 O 2 , bei welchem wasserlösliche, oder in mit Wasser mischbaren organischen Lösungsmitteln lösliche, organische Substrate, die mit 1 O 2 reagieren, in einem mit Wasser mischbaren organischen Lösungsmittel, in Wasser oder in einem Gemisch aus Wasser und mit Wasser mischbaren organischem Lösungsmittel in Gegenwart eines heterogenen oder homogenen Katalysators mit 3-90%igem H 2 O 2 versetzt werden, worauf anschließend an die katalytische Zersetzung von H 2 O 2 zu Wasser und 1 O 2 die Oxidation der Substrate zu den entsprechenden Oxidationsprodukten erfolgt, wobei während der Reaktion Wasser selektiv mittels Membranen aus dem Reaktionsgemisch entfernt wird.