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<p>such "straight-run" diesel is insufficient in supply and quality, so other sources of diesel fuels are blended in.  One major source of additional diesel fuel is obtained by cracking heavier fractions, using <a href="page.php?w=visbreaker">visbreaking</a> and coking.  This technology converts less useful fractions but the product contains olefins (<a href="page.php?w=alkene">alkene</a>s) which require <a href="page.php?w=hydrogenation">hydrogenation</a> to give the saturated hydrocarbons as desired.  Another refinery stream that contributes to</p><p>
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