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Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Preparation and Reactions of Thiols

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...

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The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...

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Updated: Mar 3, 2026

Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol

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Published on: April 2, 2018

Hydrogen Sulfide and Ionic Liquids: Absorption, Separation, and Oxidation.

Cinzia Chiappe¹, Christian Silvio Pomelli²

¹Dipartimento di Farmacia, via Bonanno 33, 56126, Pisa, Italy. cinzia.chiappe@unipi.it.

Topics in Current Chemistry (Cham)

|April 28, 2017

Summary

Ionic liquids offer a greener alternative for hydrogen sulfide (H2S) capture, overcoming the energy and environmental drawbacks of traditional methods. This review details their potential and challenges in H2S absorption, separation, and oxidation.

Keywords:

Acidic gases Hydrogen sulfide capture Ionic liquids Oxidation

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Last Updated: Mar 3, 2026

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Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

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Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand

Published on: September 8, 2016

Area of Science:

Green Chemistry and Materials Science
Chemical Engineering and Process Technology

Background:

Current hydrogen sulfide (H2S) capture methods are energy-intensive and pose environmental risks due to solvent emissions.
Ionic liquids (ILs) present a low-volatility, eco-friendly alternative for gas capture applications.

Purpose of the Study:

To review the advancements and challenges in utilizing ionic liquids for effective H2S capture.
To analyze the influence of IL structure (anions, cations, functional groups) on H2S absorption, separation, and oxidation.

Main Methods:

Comprehensive literature review of ionic liquids for H2S capture.
Analysis of experimental data and molecular simulation studies.
Evaluation of predictive methods for IL performance.

Main Results:

Ionic liquids demonstrate tunable properties for selective H2S absorption and separation.
The chemical structure of ionic liquids significantly impacts their H2S capture efficiency and oxidation behavior.
Molecular simulations and predictive models are emerging tools for designing effective ILs.

Conclusions:

Ionic liquids are a promising technology for energy-efficient and environmentally benign H2S capture.
Further research is needed to optimize IL design and scale-up processes for industrial application.