Petroleum Refining and Characteristics

This set of vocabulary flashcards covers the fundamental concepts of petroleum chemistry, classification, refining processes (distillation and cracking), and the environmental and health impacts of petroleum exploitation.

Crude Oil (Petroleum)

A fossil fuel composed of a mixture of hydrogen and a majority of carbon, typically containing approximately $80\%$ carbon, $11\%$ hydrogen, and $1\%$ to $2\%$ sulfur.

Light Crude Oil

A category of petroleum in industrial classification with a density lower than $0.828$ ($d_{15}^{4} < 0.825$).

KUOP Factor

A correction factor measuring the nature of paraffins, where a value of $10$ represents pure aromatics and $13$ represents paraffins.

Paraffins (Alkanes)

Saturated hydrocarbons with the general formula $C_nH_{2n+2}$. These can be normal (straight chain) or iso-paraffins (branched chain).

Naphthenes (Cycloalkanes)

Saturated cyclic hydrocarbons with the general formula $C_nH_{2n}$, including compounds like cyclohexane and decaline.

Aromatics (Benzenes)

Unsaturated cyclic structures with the formula $C_nH_{2n-6}$ characterized by three double bonds in each ring.

Thiols (Mercaptans)

Acidic organic sulfur compounds with the formula $R\text{-}SH$ that are corrosive and possess a strong odor.

Reference Crude Oils

Standard crudes used for benchmarking, specifically Arabian Light (Middle East), Brent (Europe), and West Texas Intermediate (WTI, America).

Natural Gas

A gaseous fossil fuel composed of over $90\%$ methane, and approximately $1\%$ to $4\%$ of other hydrocarbons like ethane, propane, and butane.

Gasoline (Essence)

A mixture of light hydrocarbon fractions with a boiling point between room temperature and $204\,^{\circ}\text{C}$, primarily characterized by its octane index.

Kerosènes

Mixtures of paraffins and naphthenes with a boiling point between $160\,^{\circ}\text{C}$ and $288\,^{\circ}\text{C}$, used for lighting, heating, and diesel constituents.

Refining

The set of treatments and transformations performed in a refinery to extract the maximum number of high-value commercial products from petroleum.

Desalting (Dessalage)

A pretreatment step involving chemical, electrostatic, or filtration methods to remove water, salts, and solids to prevent corrosion and catalyst poisoning.

Atmospheric Distillation

The fundamental refining operation that separates crude oil into "cuts" or fractions (gas, naphtha, kerosene, gazole) based on boiling points at normal pressure.

Vacuum Distillation

A distillation process conducted at reduced pressure, allowing heavy residues to be cut at lower temperatures to prevent thermal destruction of the product.

Cracking

A conversion process that breaks complex organic molecules into smaller ones, such as alkanes, alkenes, aldehydes, and ketones.

Catalytic Cracking

A thermal conversion process occurring at approximately $450\,^{\circ}\text{C}$ in the presence of a catalyst like zeolites or silicates of aluminum.

Reforming (Reformage)

A refining method used to convert naphthenic molecules into aromatics to produce a high octane index base for automobile fuels.

Petroleum Coke

A solid byproduct composed mainly of carbon used as fuel or for manufacturing electrodes in the metallurgical industry.

Benzene-related Health Risks

Toxic effects associated with specific VOCs in petroleum, including nervous system disorders, anemia, leukemia, and problems for the fetus.