Aromatic hydrocarbon extraction water content
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The raffinate leaving the top of the extraction tower generally contains 1% (WT) of sulfolane; only a small amount of water is required to recover the solvent from this raffinate, so the amount of water needed for washing can be determined solely by the stripping volume in the recovery tower. However, when the aromatic content in the feed is very low (30–40%), the water volume in the system must be determined by the amount of water used for washing. How should this latter sentence be understood? Why is it done this way?
The aromatic content is low, the amount of raffinate oil is high; as a result, the solvent content in the raffinate oil increases, which raises the load on the washing tower. Therefore, it is necessary to increase the amount of water used for washing, to such an extent that it even exceeds the amount of steam required by the stripping tower.
Is this data correct? 1% WT solvent loss? Our parameter is kept at 5PPM. Take a look at how much solvent you lose each year It’s a bit big.