Davy Process Technology Limited

Johnson Matthey Davy Technologies Limited

Michael William Winter

Julian Stuart Gray

Andrea Gnagnetti

In a process for the separation of solid carboxylic acid fines from mother liquor that includes such fines, the mother liquor is fed to a settlement drum at above atmospheric pressure. The mother liquor having a lower concentration of carboxylic fines than that fed to the settlement drum is then removed, wherein the mother liquor removal occurs at a point above the point at which the mother liquor containing fines is fed to the settlement drum. In a system for performing the separation process, a settlement drum has an inlet for mother liquor with carboxylic acid fines and an outlet for mother liquor having a lower concentration of carboxylic acid fines content than that of the mother liquor introduced via the inlet. The settlement drum is configured to operate at above atmospheric pressure and the outlet is located at a point in the settlement drum above the inlet.

Process and system for the separation of solid carboxylic acid fines

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.

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Michael William Winter