Abstract: In a process for removing aromatic carboxylic acid from a slurry thereof in solvent, the slurry is split into sub streams and each of said sub streams is supplied to a respective rotary pressure filter such that the sub stream pass through the filters in parallel. Gas is passed through the rotary pressure filters in series in an open-loop arrangement.

Abstract: In a process for the separation and drying of crude carboxylic acid crystals from a slurry in a solvent, the slurry is supplied to a filter operating at pressure and at a temperature above the atmospheric boiling point of the solvent. A cake of separated crystals is removed from the filter and passed to a thermal dryer. In a system for the separation and drying of crude carboxylic acid from a slurry in a solvent, a pressure filter device has a slurry inlet and an outlet for a cake of carboxylic acid crystals. The system also has a thermal dryer and means for transporting the cake of carboxylic acid crystals from the pressure filter device to the dryer. The pressure filter device is configured to operate at a pressure and temperature above the atmospheric boiling point of the solvent.

Abstract: In a process for removing aromatic carboxylic acid from a slurry thereof in solvent, the slurry is split into sub streams and each of said sub streams is supplied to a respective rotary pressure filter such that the sub stream pass through the filters in parallel. Gas is passed through the rotary pressure filters in series in an open-loop arrangement.

Abstract: In a process for the separation and drying of crude carboxylic acid crystals from a slurry in a solvent, the slurry is supplied to a filter operating at pressure and at a temperature above the atmospheric boiling point of the solvent. A cake of separated crystals is removed from the filter and passed to a thermal dryer. In a system for the separation and drying of crude carboxylic acid from a slurry in a solvent, a pressure filter device has a slurry inlet and an outlet for a cake of carboxylic acid crystals. The system also has a thermal dryer and means for transporting the cake of carboxylic acid crystals from the pressure filter device to the dryer. The pressure filter device is configured to operate at a pressure and temperature above the atmospheric boiling point of the solvent.

Abstract: In a process for the separation of carboxylic acid from a slurry in a solvent, a slurry with crystals of carboxylic acid is supplied to a filter operating at pressure and at a temperature above the atmospheric boiling point of the solvent. Inert gas is mixed with the solvent and the mixture is supplied to the filter. A cake of separated crystals is removed from the filter. Inert gas removed from the filter is not recycled. In a system for performing such separation, a pressure filter device has a slurry inlet, and an outlet. Means for mixing inert gas and solvent, and means for supplying the mixture to the pressure filter are provided. The pressure filter device is configured to operate at pressure and at a temperature above the atmospheric boiling point of the solvent. The system does not include means for recycling inert gas removed from the filter.

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: A process for producing aromatic dicarboxylic acids by the oxidation of dimethylbenzenes wherein dimethylbenzenes are mixed with an oxygen containing gas, solvent and catalyst in a reactor and the reaction mixture is agitated with one or more asymmetric radial impellers in combination with at least one axial impeller.

Abstract: The present invention relates to a process for producing aromatic dicarboxylic acids by the oxidation of dimethylbenzenes wherein the dimethylbenzenes are mixed with an oxygen containing gas, solvent and catalyst in a reactor, the improvement comprising agitating the reaction mixture with one or more asymmetric radial impellers in combination with at least one axial impeller.