초록 ▼

An improvement in a process for regenerating a water-containing, highly volatile organic solvent which has been used to scrub acid constituents from gases having a low content of water and of volatile compounds of the 8th group of the Periodic System is disclosed. According to the process, solvent w

An improvement in a process for regenerating a water-containing, highly volatile organic solvent which has been used to scrub acid constituents from gases having a low content of water and of volatile compounds of the 8th group of the Periodic System is disclosed. According to the process, solvent which contains absorbed acid constituents is regenerated in a regeneration zone by heating the same to drive off acid constituents and deacidified solvent is recycled in the scrubbing process. According to the invention the solvent is contacted during the regeneration with a complexing agent soluble in the solvent in an amount of 0.005 to 1 gram complexing agent per liter of solvent. A branch stream is removed from the regeneration zone which branch stream contains volatile solvent, water and metal salts dissolved in the water. The branch stream is subjected to distillation to remove overhead the volatile solvent which is returned to the regeneration zone and to leave behind an aqueous solution of the metal salt. A compensating amount of water is added to the solvent cycle.

대표청구항 ▼

In a process for regeneration of water-containing methanol or water-containing, highly volatile organic solvent, having a boiling point less than water, which has been used to scrub the acid constituents of a gas having a low content of water and of volatile compounds of metals of the eighth group o

In a process for regeneration of water-containing methanol or water-containing, highly volatile organic solvent, having a boiling point less than water, which has been used to scrub the acid constituents of a gas having a low content of water and of volatile compounds of metals of the eighth group of the Periodic System, wherein said laden solvent is regenerated by heating and/or flashing and/or stripping the same in a regeneration zone to drive off acid constituents absorbed thereby and deacidified regenerated solvent is recycled to the scrubbing process, the improvement which comprises: A. contacting said solvent during said regeneration with a complexing agent soluble in said solvent, said complexing agent being added in an amount of 0.005 to 1 gram per liter of solvent; B. removing a branch stream from regenerated solvent and distilling off solvent therefrom by heating the same and returning distilled off solvent to said regeneration zone; C. removing as the remaining phase from the distillation of step B an aqueous solution of a metal salt; and D. introducing water into said solvent cycle to replace the water removed in step C.