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  • Liquid-Liquid Extraction Column
  • Liquid-Liquid Extraction Column

In plants liquid-liquid extraction column is used to separate components using solvent. In liquid-liquid extraction process solute is transferred between solvents. Moreover, both the solvents are insoluble in one another. However, the solvent which contain solute we consider it a feed stream. And, other is solvent stream in which solute transfer takes place.

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Product Description

Liquid-liquid extraction is a technically advanced, niche separation technology. It is applied when simpler alternatives such as distillation are not able to meet your requirements. Components are extracted from your feed with the help of a solvent, without an energy demanding evaporation step.


Extraction Columns are used for liquid-liquid extraction, which is an important separation technology in the chemical and pharmaceutical industry. The fields of application are the separation of azeotropic mixtures, of thermosensitive products, of mixtures with very high or very low boiling temperatures, where there are low amounts of target substance in carrier substance, and where a distillation is very complex.



Liquid-liquid extraction column offers high throughput and high efficiency at a low cost, and can be used for extraction of organic compounds, inorganic compounds, and non-ferrous metals, as well as reactive extraction. This extraction column alternately combines two types of trays with vertical plates and openings to discharge the heavy liquid accumulated above the trays from the opening in the form of a liquid sheet, producing dispersion droplets. The produced dispersion droplets are larger than those formed in conventional extraction columns. The liquid sheet repeats deformation motion until all the liquid is dispersed, stimulating mass transfer. As a result, this extraction column is characterized by 1) high throughput, 2) high efficiency, and 3) resistance to fouling. In particular, throughput (flow rate per cross-sectional area) is 2-5 times higher than other representative extraction columns such as perforated columns and agitated extraction columns.


In plants liquid-liquid extraction column is used to separate components using solvent. In liquid-liquid extraction process solute is transferred between solvents. Moreover, both the solvents are insoluble in one another. However, the solvent which contain solute we consider it a feed stream. And, other is solvent stream in which solute transfer takes place.

Selection of solvent for extraction is based on many criteria such as boiling point, environment friendly, cost and toxicity. In extraction process feed and solvent streams mixing enhance the solute transfer from feed to solvent stream. After mixing when this mixture settles, two layers forms. In which upper layer is light phase and bottom layer being heavy phase.

Applications of Liquid-Liquid Extraction Column


(1) Applicable to liquid-liquid extraction and liquid-liquid reactive extraction

Extraction of aromatics from cracked gasoline and coal light oil
Extraction of organic compounds and inorganic compounds from reaction solution and aqueous solution
Liquid-liquid reactive extraction removal of specific components from a mixture
Extraction of low concentration non-ferrous metals (uranium, cobalt, silver) from aqueous solution


(2) Oil extraction from aqueous solution

Augmenting capabilities of existing facilities
Augmenting capabilities of sieve tray towers, packed columns, agitated extraction (RDC (rotating contactor),
ARDC (asymmetric rotating disc contactor), Oldshue-Rushton column) by tray/internal exchange


(3) Intensification of process performance


Features

  • High throughput
  • High-efficiency extraction
  • Wide operating range (low turndown ratio)
  • Resistance to interface suspended substances (scum) and fouling
  • Free from any clogging trouble due to polymerization components
  • Simple in structure and easy to maintain

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