A petroleum reformate stream of 4,000 bbl/day is to be contacted with diethylene glycol to extract the aromatics from the paraflins. The ratio of solvent volume to refonnate volume is 5. It is estimated that eight theoretical stages will be needed. Using Tables 8.2 and 8.3, and Figure 8.8. which types of extractors would be most suitable?

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Process Yes Separators, centrifugal extractors Small volume No Emulsion Yes formation, poor separation Separators Centrifugal extractors, Graesser, RDC, ARD With No reserva- tions Small number of theoretical stages required (<5) Yes Yes Mixer-settler battery, centrifugal extractors Low height No No Yes All column types, centrifugal extractors Small floor area Large number of theoretical stages required (>5) Yes Yes Mixer-settler battery, Graesser Low height No Yes Small floor area Pulsating sieve tray column, Kuhni, Lurgi High Small load Yes Yes throughput (>50m3/h) range tower extractor V No Yes No Large load RDC, ARD range Low Yes Yes Pulsating Small load throughput packed column, Karr column range Figure 8.8 Scheme for selecting extractors. (<50m/h) No (From K.-H. Reissinger and J. Schroeter, I. Chem. E. Symp. Ser. No. 54, 33-48 (1978).] Yes Scheibel, > Oldshue- Rushton Large load range