Abstract:
The present invention relates to a method for preparing a terephthalic acid via a paraxylene liquid phase oxidation, more particularly comprising a first oxidation reaction to obtain the terephthalic acid and a paratoluic acid in which the paraxylene is oxidized in a first oxidation reactor at 100~170°C in the presence of a water solvent and a first catalyst including a manganese salt and a cobalt salt, and a second oxidation reaction to obtain the terephthalic acid in which the unreacted paraxylene in the first oxidation reaction and a reaction resultant are oxidized in a second oxidation reactor at 150~220°C in the presence of a water solvent and a second catalyst including a manganese salt and a cobalt salt, characterized in that the concentration of paraxylene in the liquid of the first oxidation reactor is adjusted to 30~90 wt %.
Abstract:
A process for the removal and recovery of at least one heavy metal and at least one halogen from a liquid stream in a chemical process is disclosed. The process comprises the steps of contacting the liquid stream with a strong base anion exchange resin; and contacting a discharge stream from the first step with a chelating cation exchange resin. The recovery process optionally includes a step regenerating the anion exchange resin by contacting the anion exchange resin with an anion exchange resin regeneration solution to form recovered heavy metals and halogens. Optimally, the recovery process of the present invention also includes a step of regenerating the chelating cation exchange resin to form recovered heavy metals and halogens.
Abstract:
본 발명은 파라자일렌의 액상산화(liquid phase oxidation)에 의해 테레프탈산을 제조하는 방법으로서, 구체적으로 제1산화반응기에서 물 용매와, 망간염 및/또는 코발트염을 포함하는 제1촉매의 존재 하에 100~170℃에서 상기 파라자일렌을 산화시켜 테레프탈산 및 파라톨루익산을 얻는 제1산화반응; 및 제2산화반응기에서 물 용매와, 망간염 및/또는 코발트염을 포함하는 제2촉매의 존재 하에 150~220℃에서 상기 제1산화반응의 미반응된 파라자일렌 및 반응 결과물을 산화시켜 테레프탈산을 얻는 제2산화반응을 포함하고, 상기 제1산화반응의 시작점에서 상기 제1산화반응기 내 액체 중 상기 파라자일렌의 농도를 30~90wt%로 조절하는 것이 특징인 테레프탈산의 제조방법을 제공한다.
Abstract:
Catalytic compositions for conversion of substituted aromatic feed materials to oxidized products comprising aromatic carboxylic acid derivatives of the substituted aromatic feed materials comprise solid particles comprising palladium in combination with at least one of antimony, bismuth and gold, and optionally, an additional metal or metalloid component effective to promote activity or selectivity of the palladium and antimony, bismuth or gold for oxidation to aromatic carboxylic acids. A process for oxidizing substituted aromatic feed materials comprises contacting the feed material with oxygen in the presence of such catalytic compositions in a liquid reaction mixture.
Abstract:
A method for the production of aromatic carboxylic acid via oxidation of alkyl aromatic compounds is disclosed. The alkyl aromatic compound is oxidized in an oxidation reactor by a mixture of an oxygen-rich gas and recycled offgas in the presence of a catalyst system and a liquid solvent. The waste gas treatment is significantly simplified because only a small amount of the offgas is released to the atmosphere. The disclosed method is of great benefits in both economic and environment.
Abstract:
A liquid-gas phase reactor system including a slinger located in an upper section (headspace region) of a reaction vessel. The slinger comprises an upper horizontal surface including a plurality of vertically raised vanes extending radially outward along a curved path which effectively distribute liquid about the reactor vessel. A method for conducting an oxidation reaction using a liquid-gas phase reactor system is also disclosed. The disclosed reactor system and method have a broad range of applications but are particularly suited for the production of terephthalic acid.
Abstract:
Bei der Herstellung von Roh-Terephthalsäure wird einem Reaktor (1) para-Xylol, Sauerstoff und mit einem Katalysator beladene Essigsäure zugeführt, wobei das para-Xylol in dem Reaktor (1 ) unter Druck und erhöhter Temperatur zu Roh-Terephthalsäure reagiert, die aus dem Reaktor (1) abgezogen und in einen Drehdruckfilter (9) eingeleitet wird, in welchem sie unter Druck von dem Lösungsmittel getrennt und von Verunreinigungen und Katalysatormaterial gereinigt wird.
Abstract:
Изобретение относится к области органической химии и касается производства ароматических кислот и может быть использовано в химической и пищевой промышленности. Сущность изобретения: cпособ получения бензойной кислоты включающий получения в диффузионных условиях оксидата в виде смеси толуола с раствором щелочных солей бензойной кислоты путем гидротермального окисления толуола кислородом воздуха в процессе непрерывного перемешивания и присутствии водного раствора карбоната щелочного металла. Выделение из оксидата и возврат на этап гидротермального окисления выделенного толуола. Доокисление отделенного от неокисленного толуола раствора щелочных солей бензойной кислоты кислородом воздуха. Последующее обезвоживание доокисленного раствора щелочных солей бензойной кислоты в выпаривателе содержавшейся в нем воды и сушку обезвоженного раствора щелочных солей бензойной кислоты, последнего газообразными продуктами горения в кипящем слое. Загрузку сухих щелочных солей бензойной кислоты в заполненную под давлением диоксидом углерода полость вспомогательного реактора. Воздействие на загруженные в полость вспомогательного реактора сухие щелочные соли раствором органического растворителя для выделения бензойной кислоты и ее затаривание после выпадения из органического растворителя.
Abstract:
Method for gas phase oxidation, in which a gaseous flow which comprises at least one aromatic hydrocarbon and molecular oxygen is directed through one or more catalyst layers, wherein a moderator layer is arranged between two catalyst layers arranged one behind the other in the flow direction of the gaseous flow, wherein the moderator layer is catalytically less active than the catalysts adjoining upstream and downstream or is catalytically inactive. The desired oxidation products are obtained in high yield for longer periods.