Raffinate water sol solvent extraction from hydrocarbon - stream produced in primary extraction

摘要

The solvent is extracted with aqs secondary solvent in an extraction tower contg. a plurality of perforated extraction decks, the solvent contng raffinate being passed through the perforation at a hole velocity of at least 2 ft/sec. pref 5-8 ft/sec. The raffinate stream may be non-aromatic hydrocarbons obtd in a primary aromatic process using sulpholane type solvent of formula (where R1, R2 R3 and R4 are independently H, 1-10C alkyl, 1-12C aralkyl and 1-8C alkoxy) contg. polyalkylene glycol. The raffinate may be passed up the tower in countercurrent to the secondary solvent water.