Wastewater from oilrefiner is treated by solvent extraction to dephenolize.
用溶剂萃取法对炼油含酚废水脱酚处理。
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A deal unveiled on May 24th, in which PetroChina, another partially state-owned oil firm, will buy a big stake in Singapore Petroleum, a refiner, hints at a new tactic.
Tesoro, an American refiner, scrapped one scheme last year because of rising costs. Kuwait's national oil company has delayed another for the same reason.