Patent ID: 9067806
Filing Date: 2015-06-30
Classification: C02F,Y02W

Abstract:
1. A process for purifying an aqueous stream (i) coming from a Fischer-Tropsch reaction containing organic acid(s) comprising: adding at least one inorganic base to the aqueous stream (i), feeding the aqueous stream (i) after addition of the at least one inorganic base to an evaporator and obtaining a vapor stream (ii) and an aqueous stream (iii): separating aqueous stream (iii) in the distillation column into an aqueous stream (iv) which emerges from a head of the distillation column and an aqueous stream (v) which emerges from a bottom of the distillation column: adding to the aqueous stream (iv) exiting from the head of the distillation column at least one organic base having a pKa, measured at 25° C. in water, greater than or equal to 7; and combining the aqueous stream (iv), after addition with the at least one organic base, with the aqueous stream (iia) to obtain an aqueous stream (vi); routing the aqueous stream (vi) and a process gas to a saturator and producing a gaseous stream (vii) from a head of the saturator; and feeding the gaseous stream (vii) from the saturator to a synthesis gas production plant; and, optionally, routing a drain stream (viii) from a bottom of the saturator into aqueous stream (i); and, optionally, routing the aqueous stream (v) exiting from the bottom of the distillation column to further treatment in order to obtain purified water.