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Figure 3 – Rearranging Chains

Now that we have seen how various fractions are changed,
we will discuss the how the fractions are treated and blended to
make commercial products.

Treating and Blending the Fractions

Distillated and chemically processed fractions are treated to
remove impurities, such as organic compounds containing sulfur,
nitrogen, oxygen, water, dissolved metals and inorganic salts.
Treating is usually done by passing the fractions through the
following:
— a column of sulfuric acid – removes unsaturated
hydrocarbons (those with carbon-carbon double-bonds), nitrogen
compounds, oxygen compounds and residual solids (tars, asphalt);
— an absorption column filled with drying agents to remove
water;

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