Lesson 1Naphthenes (cycloalkanes): structures (cyclohexane, methylcyclopentane), occurrence in naphtha/kerosene, uses and effects on fuel propertiesLooks at cycloalkane builds and shapes, key on cyclohexane and methylcyclopentane. Checks their place in naphtha and paraffin, refinery making paths, and pull on density, octane, and smoke point.
Cycloalkane structures and conformationsCyclohexane and methylcyclopentane examplesOccurrence in naphtha and kerosene cutsRefinery processes forming naphthenesEffects on octane, density and smoke pointLesson 2Olefins (alkenes): sources (cracking units), examples (ethylene, propylene, butenes), reactivity, impact on stability and polymer feedstock useChecks olefin builds, sources from cracking setups, and samples like ethylene, propylene and butenes. Talks high reaction speed, gum and buildup, and worth as polymer and chemical feeds.
Structural features of olefins and isomersSteam and fluid catalytic cracking sourcesEthylene, propylene and butenes examplesReactivity, oxidation and gum formationPolymer and petrochemical feedstock rolesLesson 3Isoparaffins (branched alkanes): structural features, examples (iso-octane), origin in fractions and catalytic reforming, importance for gasoline octaneSpotlights isoparaffins, their branched builds and samples like iso-octane. Explains making in isomerising and reforming setups, and why they sit at heart of high-octane, low-knock petrol mixes.
Structural features of branched alkanesIso-octane as an octane reference fuelIsomerization and reforming formation pathsVolatility and combustion of isoparaffinsUse in premium and reformulated gasolinesLesson 4Paraffins (n-alkanes): general formula, representative molecules (n-pentane, n-octane), refinery sources and major usesIntroduces straight paraffins, their basic formula, and chain series. Reviews key bits like n-pentane and n-octane, their boiling spans, refinery sources, and roles in petrol, paraffin, diesel and wax flows.
General formula and homologous series conceptPhysical trends across n-alkane seriesRepresentative n-pentane and n-octane usesRefinery units producing normal paraffinsRoles in gasoline, diesel and wax productsLesson 5Cetane number fundamentals: molecular features that raise or lower cetane and relevance to diesel ignition qualityLooks into cetane number as diesel start quality measure, tying molecule build to start delay. Discusses straight paraffins, branching, rings, aromatics, and extras, plus test ways and usual spec ranges.
Definition and significance of cetane numberNormal paraffins and high cetane behaviorBranching, rings, aromatics and low cetaneCetane improver additives and treat ratesEngine and CFR test methods for cetaneLesson 6Analytical methods for molecular-class determination: GC, simulated distillation (SIMDIS), PIONA analysis (Paraffins, Isoparaffins, Olefins, Naphthenes, Aromatics)Describes check methods for sorting hydrocarbon classes in fuels. Compares GC, mock distillation, and PIONA checks, spotlighting rules, outputs, detail limits, and how findings guide mixing choices.
Gas chromatography principles and columnsSimulated distillation for boiling profilesPIONA methodology and class separationData interpretation for refinery blendingLimitations, calibration and quality controlLesson 7Other property correlations: flash point, viscosity, hydrogen content, and how molecular structure controls theseTies molecule build to flash point, thickness, hydrogen amount and linked safety and run traits. Shows how chain size, branching, and aromatic touch shape handling, burn quality and emissions.
Flash point trends with volatility and cutsViscosity versus chain length and shapeHydrogen to carbon ratio and emissionsLubricity, wear and molecular structureSpecification limits and property tradeoffsLesson 8Functional relationships: how chain length affects volatility, boiling point, and vapor pressureExplains how hydrocarbon chain size runs volatility, boiling point, and vapour push. Links between-molecule pulls and surface area to phase acts, distillation graphs, cold flow, and vapour loss in fuels.
Intermolecular forces in hydrocarbon chainsBoiling point trends with carbon numberVapor pressure and volatility relationshipsImpact on distillation curves and cut pointsCold flow, evaporation loss and safetyLesson 9Aromatics: benzene, toluene, xylenes — structure, formation routes, distribution in crude fractions, role as petrochemical feedstocks and octane contributorsDetails aromatic bits like benzene, toluene and xylenes, their builds and making paths. Reviews spread over crude cuts, roles as octane lifts, and big place as chemical feeds.
Benzene, toluene and xylene ring structuresFormation in reforming and pyrolysis unitsDistribution in naphtha and heavier cutsOctane contribution in gasoline blendingPetrochemical and solvent applicationsLesson 10Branching vs straight chain: influence on octane number and volatility; use of Research Octane Number (RON) and Motor Octane Number (MON) conceptsBreaks down how branching beats straight chains on octane number, volatility, and knock fight. Explains RON and MON meanings, test setups, sensitivity, and how fuel plans balance drive ease and save.
Straight chains and low octane behaviorBranching patterns and octane enhancementVolatility changes with branching degreeDefinitions of RON, MON and sensitivityFuel design using RON and MON targetsLesson 11Rings and aromaticity: influence on density, energy content, soot tendency, and octane; effects on cetane number for dieselChecks ring setups and aromatic touch, relating to density, energy hold, soot lean, and octane. Compares aromatics and naphthenes, and spells their opposite pulls on petrol octane and diesel cetane.
Aromaticity criteria and ring stabilizationDensity and volumetric energy relationshipsOctane enhancement by aromatics in gasolineSoot and particulate formation tendenciesEffects on diesel cetane and ignition delay
