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KPC had offered three cargoes totalling 72,000 tonnes for April to June loading, or one 24,000-tonne cargo a month.
It was unclear if Trafigura has bought all the three cargoes, but traders said the premiums were above $40 a tonne to Middle East quotes on a free-on-board (FOB) basis but below $50 a tonne.
KPC started selling the light grade around 2010 after it started commercial operations at an aromatics plant. Before that, it sold only full-range naphtha.
The state-owned refiner usually sells the light and full-range grades through a one-year contract or on a spot basis.
The light naphtha is suitable for gasoline blending, while the full-range grade is for cracking into petrochemicals.