- Crude oil is heated in a distillation column.

- The different components of the oil have different boiling points.

- The lighter components, such as methane and ethane, boil off first.

- The heavier components, such as diesel and tar, boil off later.

Step 2: Cracking

- Some of the heavier components from the distillation column are cracked into smaller molecules.

- This is done by heating the oil in the presence of a catalyst.

- Cracking produces gasoline, jet fuel, and other products.

Step 3: Reforming

- Reforming is a process that converts low-octane gasoline into high-octane gasoline.

- Octane is a measure of a gasoline's resistance to knocking.

- Reforming is done by heating the gasoline in the presence of a catalyst.

Step 4: Treating

- The final step in the refining process is treating.

- This involves removing impurities from the gasoline, such as sulfur and nitrogen.

- Treating also helps to stabilize the gasoline and prevent it from going bad.

Step 5: Blending

- The final product of the refining process is blended to meet customer specifications.

- This involves mixing different types of gasoline together to achieve the desired octane rating, Reid vapor pressure, and other properties.

Here’s What the 4 Types of Petroleum Refining Are:

1. Distillation: Oil is heated, then separated into layers in a distillation tower, as different hydrocarbons vaporize at specific temperatures.

2. Conversion: Heavier hydrocarbon molecules are converted into lighter ones, such as gasoline and diesel, using heat, pressure, and catalysts.

3. Treating: Impurities are removed from hydrocarbon products through processes like hydrotreating and sweetening.

4. Blending: Different refined products are mixed together to create desired end-products, such as different grades of gasoline, jet fuel, and more.