Catalytic Cracking Process

The catalytic cracking process is the profit engine of a modern refinery, taking heavy, low-value vacuum gas oil and converting it into high-octane gasoline, olefins and lighter products. By using an acidic zeolite catalyst rather than heat alone, the unit steers the reaction toward the carbon bonds that matter, improving both yield and selectivity.

The Core Principle

Unlike thermal cracking, which produces a broad, lower-value spread of gases and carbon, catalytic cracking runs over a solid acid catalyst that promotes controlled scission through carbocation intermediates. This selectivity is what lets refiners shift output between gasoline, light olefins and other products simply by tuning catalyst composition and operating conditions.

How the Unit Flows

Feedstock is injected with finely divided catalyst into a high-temperature reaction zone where the heavy molecules break apart. The spent catalyst, now coated in coke, circulates to a regenerator that burns the coke off and restores activity, so the same material cycles continuously. The cracked effluent is then separated and fractionated into gasoline, diesel, light gases and other streams.

Why the Catalyst Defines the Output

Catalyst type, pore structure and metal loading all shape the product slate. Zeolite-based acid catalysts favour gasoline, while bifunctional systems that pair acidic and metallic sites support hydrocracking routes with simultaneous hydrogenation. Selecting and regenerating the catalyst properly is what keeps conversion high, coke manageable and unit economics steady over long runs.

Learn More:

• Feasibility Studies for Waste-to-Value Projects
• Turn-Key EPC Delivery
• Plant Design & Engineering
• Facility Efficiency Upgrades
• Resource Recovery Projects

Maximise yield from every barrel you process

Right-sized catalytic cracking turns heavy streams into higher-value products.

Klean Industries engineers conversion and refining units that lift throughput while protecting margins.

Considering a catalytic cracking project?

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