Single solute batch extraction

Figure 3.30. Single-solute batch extraction between immiscible liquid phases.

BATEX - Single Solute Batch Extraction System... 

Dynamics of an Equalisation Basin 560 Dimensionless Kinetics in a Batch Reactor 235 Batch Reactor with Complex Reaction Sequence 240 Single Solute Batch Extraction 442 Mixing and Segregation 394... 

If we want to totally remove the solute from the diluent and have it dissolved in a solvent, the continuous solvent addition batch extraction shown in Figure 13-11 will use less solvent than repeated single-stage batch extractions. A solvent that is pre-saturated with diluent is added continuously to a mixed tank that contains the feed. The raffinate and extract phases are separated in a settler with withdrawal of the extract product and recycle of the diluent. 

Consider a batch two-phase extraction system, with a single solute. 

Consider a batch two-phase extraction system, with a single solute transferring from the feed phase into an immiscible solvent phase. The background to the problem is discussed in Section 3.3.1.1... 

In the single-stage batch process illustrated in Figure 13.1, the solvent and solution are mixed together and then allowed to separate into the two phases—the extract E containing the required solute in the added solvent and the raffinate R, the weaker solution with some associated solvent. With this simple arrangement mixing and separation occur in the same vessel. 

Rather than an in-depth technical description of the mechanics of extraction, this section presents briefly a typical infusion process, focusing on the factors that make extracts different from single-chemical components. Extracts by then nature are complex mixtures of (often) diverse active compounds contained within a plant matrix which are brought into solution by the extraction process. The aim of the extractor is to produce, over a period of time, batches of an extract meeting a customer s individual specification with as little variation as possible. There are parameters over which the extractor has some control, and these can be used to help achieve product consistency and also to fine-tune an extract to a particular customer s needs. 

For a single-stage batch process or a continuous extraction process that achieves one theoretical stage, the solute reduction factor is given... 

It is desired to reduce the pyridine concentration of 5000 kg/h of an aqueous solution from 50 to 5 wt% in a single batch extraction with pure chlorobenzene. What amount of solvent is required Solve on right-triangular coordinates. Corroborate your results using the Mathcad program of Appendix G-l. 

In solid-phase extraction (SPE), solutes are extracted from a liquid phase into a solid phase. Most commonly, the liquid phase is a predominately aqueous sample solution and the extractive solid phase consists of small porous particles of silica with a bonded organic outer layer or else it is an organic polymer, such as cross-linked polystyrene. The extraction can take place in a batch mode in which the solid extractant particles are intimately mixed with the sample and then filtered off. However, in chemical analysis it is more common to use a flow-through mode in which the liquid sample is passed through a bed of the solid extractant packed in a small tube. This technique gives more complete extraction of the desired analytes than the batch mode, in which there is only a single equilibration of analytes between the liquid and solid phases. 

In principle, it might be possible to effect a reasonable purification of a rare metal in solution by a single-batch extraction, if either the distribution coefficient or the solvent-to-aqueous volume ratio were high. However, a fairly high process cost would usually have been borne by the previous ore... 

This example considers the interactions involved in multicomponent extraction as shown in Sec. 3.3.1.2 and takes the particular case of a single batch extractor with two interacting solutes. 

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