Novel extraction strategies for the concentration of ferric chloride

Miran Milošević*, Boelo Schuur, Andre B. De Haan

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)


The objective of this research was to develop a novel, energy-efficient processes for concentrating ferric chloride solutions. When applying liquid-liquid extraction, the high energy for water evaporation can be avoided. Here, we report a study on the use of liquid-liquid extraction for concentration of ferric chloride solutions. First, a range of commercially available solvents (e.g. ethers, phenols, amides, thiols, amines) was screened at room temperature and under atmospheric pressure for an initial FeCl3 concentration of 20 wt%, using a solvent/feed (S/F) ratio of 0.25. Hereafter, the extraction with the most interesting solvents was analyzed in more detail, and finally the recovery of FeCl3 from the solvents was studied. From the screening it was concluded that diethyl ether and diisopropyl ether were the most promising, thus those two solvents were selected for a more detailed study. The FeCl3-extraction was studied at equilibrium for 0.5 < S/F < 2.0, 0 < pH < 1, 5 wt% < FeCl3,initiai < 30 wt%), and at 295.15 K and atmospheric pressure. A complete (100% extraction yield, initial concentration 5 wt%) FeCl3 extraction was coupled to a recovery by combined ether evaporation and back extraction with water to yield a final salt concentration of 45 wt%. Based on this result, we conclude that extractive concentration of FeCl3 with ethers is a promising technology.

Original languageEnglish
Pages (from-to)733-738
Number of pages6
JournalChemical engineering transactions
Publication statusPublished - 2011
Externally publishedYes


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