Abstract:
Process for the production of benzoic acid, said process comprising the steps of: (A) producing ethanol from a biomass, which is advantageously a carbohydrate-containing biomass, then (B) causing the ethanol produced at the step (A) to react with methanol, so as to produce benzyl alcohol and/or benzaldehyde, then (C) causing the benzyl alcohol and/or benzaldehyde produced at the step (B) to react with oxygen, so as to produce benzoic acid.
Abstract:
A process is described for recovering cobalt and/or manganese from a residue from a catalytic oxidation process for producing an aromatic polycarboxylic acid, wherein the residue comprises water-soluble cobalt and/or manganese compounds and an acidic organic component. The process comprises providing a first solution containing part of the residue including at least part of the water-soluble cobalt and/or manganese compounds. An alkali metal compound selected from an alkali metal carbonate and an alkali metal bicarbonate is added to the first solution to raise its pH to ≥5 to ≤7 and release CO2. The release rate of CO2 gas from the first solution is between 350 and 400 kg/hour. An alkali metal carbonate is then added to the first solution to further raise the pH thereof to ≥7, thereby precipitating cobalt and/or manganese carbonate-containing species.
Abstract:
A process of liquid phase oxidation of a hydrocarbon compound involving injection of pure oxygen into a hquid hydrocarbon in a reaction vessel while maintaining the atmosphere of the reaction vessel headspace outside the explosion triangle for the oxygen-hydrocarbon system.
Abstract:
Disclosed is a process for preparing phthalic anhydride by gas phase oxidation of aromatic hydrocarbons, in which a gas stream comprising at least one aromatic hydrocarbon and molecular oxygen is passed continuously over a thermostatted catalyst and the supply of the at least one aromatic hydrocarbon to the catalyst is temporarily interrupted after putting the catalyst on stream.
Abstract:
A process for oxidizing alkyl aromatic compounds is described. The process includes contacting the alkyl aromatic compound; an oxidation solvent comprising a carboxylic acid; ammonia or an ammonium compound; a bromine source; a catalyst; and an oxidizing agent in a reaction zone under oxidizing conditions to produce an oxidation product comprising an aromatic carboxylic acid, and an aromatic amide compound; and hydrolyzing the aromatic amide compound with a hydrolyzing agent to form an ammonium compound or ammonia and the aromatic carboxylic acid, wherein the hydrolyzing agent comprises an acid, or water, or both.
Abstract:
Beschrieben wird ein Verfahren zur Aufreinigung von Katalysatorrückstände enthaltenden Abströmen aus Anlagen zur Herstellung carbocyclisch-aromatischer Mono- oder Polycarbonsäuren oder heterocyclisch-aromatischer Mono- oder Polycarbonsäuren durch Oxidation von Alkyl-, Hydroxyalkyl-, Alkoxyalkyl-, Aldehyd- und/oder Carbonsäureestergruppen enthaltenden Vorläufern dieser Mono- oder Polycarbonsäuren in Gegenwart von Schwermetallkationen enthaltenden Katalysatoren. Das Verfahren ist dadurch gekennzeichnet, dass mindestens ein Abstrom aus dem Oxidationsprozess mit einem chelatisierenden Ionenaustauscher in Kontakt gebracht wird, welcher ausgewählte Schwermetallkationen selektiv aus dem Abstrom entfernt, so dass die Katalysatorbestandteile in den Prozess zurückgeführt werden können, was den Bedarf an Frischkatalysator verringert. Das Verfahren gestattet eine sehr effiziente Entfernung von toxischen und/oder teuren Schwermetallkationen aus dem Abstrom.
Abstract:
The present invention relates to a method for producing terephthalic acid from lignocellulosic biomass including the steps of pyrolysis of lignocellulosic biomass in the presence of a catalyst obtaining biochar, crude bio-oil and gases; collecting an aromatic fraction from the crude bio-oil and/or from the gases, extracting toluene from the aromatic fraction by distillation; converting the toluene to a p-tolualdehyde by catalyzed carbonylation; oxidation of the p-tolualdehyde in a liquid phase oxidation to terephthalic acid.