초록 ▼

A process for purifying an aqueous, hydrogen sulfide-scrubbing solution which contains a water-soluble transition metal component, such as a vanadium component or an iron component, in addition to at least one water-soluble organic compound, such as an aromatic sulfonate or an alkanolamine, in which

A process for purifying an aqueous, hydrogen sulfide-scrubbing solution which contains a water-soluble transition metal component, such as a vanadium component or an iron component, in addition to at least one water-soluble organic compound, such as an aromatic sulfonate or an alkanolamine, in which the scrubbing solution is mixed with particles of a spent solid catalyst containing molybdenum and aluminum and a basic aqueous solution, preferably a solution comprising sodium aluminate, to form a slurry which is subsequently contacted with an oxygen-containing gas under conditions such that the molybdenum in the catalyst is solubilized. Thereafter, molybdenum is precipitated from the solution along with the water-soluble transition metal component and a wastewater substantially free of the transition metal component and the organic compound originally present in the scrubbing solution is recovered.

대표청구항 ▼

A process for purifying an aqueous hydrogen sulfide-scrubbing solution containing a water-soluble vanadium component and a water-soluble organic compound, said scrubbing solution being capable of absorbing hydrogen sulfide and converting the hydrogen sulfide into elemental sulfur, which process comp

A process for purifying an aqueous hydrogen sulfide-scrubbing solution containing a water-soluble vanadium component and a water-soluble organic compound, said scrubbing solution being capable of absorbing hydrogen sulfide and converting the hydrogen sulfide into elemental sulfur, which process comprises: (a) forming a slurry by mixing said scrubbing solution with (1) particles of a spent solid catalyst containing molybdenum and aluminum and (2) a basic aqueous solution; (b) contacting said slurry with an oxygen-containing gas under conditions such that the molybdenum in said catalyst is dissolved and oxidized to molybdate while said aluminum remains substantially in the form of a solid residue; (c) separating said aqueous solution formed in step (b) from said solid residue; (d) contacting said aqueous solution with hydrogen sulfide under conditions such that the molybdenum in said solution is precipitated, thereby forming an aqueous solution having a reduced concentration of molybdenum; (e) contacting said aqueous solution having a reduced concentration of molybdenum with a base under conditions such that the vanadium in said solution is precipitated, thereby forming an aqueous solution having a reduced concentration of vanadium and molybdenum; and (f) recovering said aqueous solution having a reduced concentration of vanadium and molybdenum as wastewater which also has a reduced concentration with respect to said slurry formed in step (a) of said water-soluble organic compound originally present in said hydrogen sulfide-scrubbing solution.