Abstract

The present invention relates to a process for the production of iso-propanol by liquid phase hydrogenation of acetone to iso-propanol in at least two hydrogenation reaction stages, each reaction stage comprising a hydrogenation reaction zone, wherein the hydrogenation reaction product leaving the reaction zone of the first reaction stage contains unreacted acetone and a product stream comprising acetone and iso-propanol is transferred to the reaction zone of a subsequent reaction stage said product stream having at the inlet to the reaction zone of said subsequent reaction stage a temperature of 60 to 100°C, wherein the temperature of the product stream leaving the reaction zone of said subsequent reaction stage at the outlet from said reaction zone is at most 40°C higher than the temperature of the product stream entering said reaction zone at the inlet to said reaction zone and the temperature in said subsequent reaction zone does not exceed 125°C, to a process of purifying an iso-propanol raw product containing less than 1000 wppm acetone comprising subjecting the iso-propanol raw product to a distillation in a dividing wall distillation column to obtain purified iso-propanol and to an integrated process for the production of phenol employing the above hydrogenation process.

IPC Classes  ?

• C07C 29/145 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen-containing functional group of C=O containing groups, e.g. —COOH of ketones with hydrogen or hydrogen-containing gases
• C07C 31/10 - Monohydroxylic acyclic alcohols containing three carbon atoms
• C07C 29/80 - SeparationPurificationStabilisationUse of additives by physical treatment by distillation
• C07C 29/76 - SeparationPurificationStabilisationUse of additives by physical treatment
• C07C 39/04 - Phenol
• C07C 45/53 - Preparation of compounds having C=O groups bound only to carbon or hydrogen atomsPreparation of chelates of such compounds by pyrolysis, rearrangement or decomposition of hydroperoxides
• C07C 37/08 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by decomposition of hydroperoxides, e.g. cumene hydroperoxide
• C07C 2/86 - Preparation of hydrocarbons from hydrocarbons containing a smaller number of carbon atoms by condensation between a hydrocarbon and a non-hydrocarbon

Abstract

The present invention relates to a continuous method for treating a crude phenol stream comprising methylbenzofuran and hydroxyacetone by passing the crude phenol stream through at least two reactors connected in series the reactors containing an acidic ion exchange resin, whereby the temperature in successive reactors decreases in flow direction of the phenol stream so that the temperature in the first reactor in flow direction of the phenol stream is between 1000C and 2000C and the temperature in the last reactor in flow direction of the phenol stream is between 500C and 900C without a thermal separation step between any of two successive reactors and to the use of this method in a process for making phenol.

IPC Classes  ?

• C07C 37/82 - SeparationPurificationStabilisationUse of additives by physical treatment by solid-liquid treatmentSeparationPurificationStabilisationUse of additives by physical treatment by chemisorption
• C07C 39/04 - Phenol

Abstract

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).

IPC Classes  ?

• C07C 37/08 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by decomposition of hydroperoxides, e.g. cumene hydroperoxide
• C07C 37/72 - SeparationPurificationStabilisationUse of additives by physical treatment by liquid-liquid treatment
• C07C 37/82 - SeparationPurificationStabilisationUse of additives by physical treatment by solid-liquid treatmentSeparationPurificationStabilisationUse of additives by physical treatment by chemisorption
• C07C 37/68 - SeparationPurificationStabilisationUse of additives
• C07C 39/04 - Phenol