Ionic Liquid Purification via Sulfide Precipitation
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Solution Overview
Problem
Existing methods for removing heavy metals from ionic liquids used in wet scrubbers, such as those contaminated with mercury, suffer from decreased efficiency due to saturation and require complex regeneration processes, necessitating a more effective method for decontamination and recovery of these liquids.
Innovation Solution
Contacting the contaminated ionic liquids with a sulfide source, like hydrogen sulfide or sulfide salts, to form heavy metal sulfides that can be easily separated by filtration, and regenerating the oxidant species within the liquid to restore its scrubbing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oxidant concentration in the scrubbing liquid is decreased due to saturation with contaminants, then the scrubbing efficiency drops, but the liquid remains in use without replacement
Solution Approach 1:
The patent applies discarding and recovering by removing accumulated heavy metal contaminants from the spent scrubbing liquid through sulfide precipitation and filtration, then regenerating the oxidant species (I2, Br2, or Cl2) from their reduced forms (I-, Br-, Cl-) to restore the liquid's scrubbing capacity and enable reuse
Solution Approach 2:
The patent applies parameter changes by transforming the chemical state of metal species from soluble salts to insoluble sulfides through reaction with sulfide sources, and regenerating the oxidant by changing the oxidation state of halide ions back to molecular halogens, thereby restoring the functional parameters of the scrubbing liquid
2Reliability
If traditional methods are used to remove heavy metals from ionic liquids, then decontamination can be achieved, but the process becomes complex and requires special adsorbents
Solution Approach 1:
The patent applies taking out by extracting heavy metal contaminants from the ionic liquid phase through sulfide precipitation, forming insoluble metal sulfides that can be easily separated by simple filtration without requiring special adsorbents or complex equipment
Solution Approach 2:
The patent uses inexpensive, readily available sulfide sources (such as sodium sulfide, ammonium sulfide, or hydrogen sulfide) to precipitate heavy metals, replacing the need for expensive specialized adsorbents while achieving effective decontamination
Data Source
AI summary
Provided herein a process for purification of an ionic liquid from heavy metals, comprising combining heavy metal-containing ionic liquid and a sulfide source to form heavy metal sulfide, and separating said heavy metal sulfide from the ionic liquid.