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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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70 <strong>George</strong> <strong>Wypych</strong><br />

Figure 3.2.1. Schematic diagram <strong>of</strong> petroleum industry products and yields. [Reproduced from reference 1]<br />

pressure therefore in the next step vacuum is applied to increase volatilization and separation.<br />

Certain fractions from the distillation <strong>of</strong> crude oil are further refined in thermal cracking<br />

(visbreaking), coking, catalytic cracking, catalytic hydrocracking, alkylation,

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