Petroleum coke is the solid black gunk left over at the end of the oil refining process.
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Buying Slavneft had never made much sense anyway Lukoil would end up with unnecessary refining capacity and Yukos with more reserves than it can easily exploit.
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But at the time, in the early 1980s, Khosla feared that he would end up fermenting beer, making animal feed, or refining petroleum.
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