Mother liquor, derived from a primary solids-liquid separation process (18) for separating aromatic carboxylic acid crystals from a slurry thereof in the mother liquor, is split into a recycle fraction (30) and a purge fraction (32). the recycle fraction (30) is returned to a reactor (10) in which the aromatic carboxylic acid is formed by liquid phase oxidation of a precursor thereof. The purge fraction (32) is concentrated in evaporator (42) to recover solvent and produce a residue for disposal or further treatment. Before concentration the purge fraction (32), it is subjected to solids-liquid separation in filtration unit (34) to remove fine solids thereby reducing the load on the evaporator (42) and facilitating the recovery of greater amounts of the solvent along with recovery of aromatic carboxylic acid fines, e.g. for recycle to the reactor (10).
申请公布号
WO9730963(A1)
申请公布日期
1997.08.28
申请号
WO1997GB00439
申请日期
1997.02.18
申请人
IMPERIAL CHEMICAL INDUSTRIES PLC;BICKHAM, DAVID, ROBERT;JEFFERY, IAN, CHARLES;WHISTON, KEITH;WATSON, BRIAN, ROBERT
发明人
BICKHAM, DAVID, ROBERT;JEFFERY, IAN, CHARLES;WHISTON, KEITH;WATSON, BRIAN, ROBERT