The steam cracking process - Petrochemicals / Oil and gas

Explore the steam cracking process in petrochemicals and oil and gas with a step-by-step introduction, practical concepts, and instructor support for engineers, operators, and technicians.

Explore the principles and mechanics of steam cracking, from naphtha feedstocks to essential products like ethylene, propylene, butadiene, and aromatics.

Discover how refineries supply steam crackers with ethane and naphtha to produce ethylene, propylene, butadiene, and aromatics, the building blocks for polymers and chemicals.

Explore the fundamentals of petrochemicals by examining carbon and hydrogen bonding, valence, and isomerism, and learn the key hydrocarbon families paraffins, olefins, naphthenes, aromatics, and polymers before studying steam cracking.

Trace the history of steam cracking from 1920s United States origins to today's ethylene production, noting early ethylene from natural gas and the rise of propylene and butadiene as intermediates.

Understand how steam cracking uses extreme heat, short residence times, and steam dilution in pyrolysis furnaces to produce ethylene, propylene, and other olefins.

NAFTA yields a range of cracked products—ethylene, propylene, butadiene, pyrolysis gasoline, hydrogen, and methane—from C2–C4 cuts; ethane-rich feeds maximize ethylene.

European steam crackers require larger investments with heavier feedstocks. Investments range from 350–400 million for ethane to 450–550 million for naphtha and around 600 million for heavy feedstock.

Explore the three zones of a steam cracker—the hot zone, compression zone, cold zone—and their equipment, including cracking furnaces, quench exchangers, compressors, columns, methanation reactors, and hydro stabilization reactor.

Explore the hot zone design of a steam cracker. We pressurize and preheat the naphtha, crack it in radiant furnaces at 850°C for a fraction of a second, then quench.

In the compression zone, cracked gas is separated and purified to recover hydrogen and ethylene. Four-stage compression with interstage cooling and caustic scrubber removes water and impurities before the demethanizer.

Explore the cold zone of steam cracking, where hydrocarbon vapors are cooled in five stages in the cold box using propylene, ethylene, methane and hydrogen, feeding demethanizer and hydrogen purification.

Explore hydrogenation units stabilizing steam cracker products through selective hydrogenation, converting unstable acetylene and di-olefins to stable hydrocarbons using catalysts and controlled temperatures.

Explain how the acetylene in the steam-cracked c2 feed is reduced to below five ppm through hydrogenation, dilution, and preheating in a three-reactor adiabatic unit.

Hydrogenate the steam-cracked C3 cut to convert propane and propadiene into propylene, targeting 3-4% residual propane and propadiene by weight, using gas-phase reactors with cooling and a dilution loop.

Explain the selective hydrogenation of the C4 cut as an outside operation, noting many sites lack a hydrogenation unit and that the C4 cat is sold or cracked with naphtha.

Hydro stabilization of pyrolysis gasoline selectively hydrogenates di-olefins and removes sulfur, uses dilution and quench loops to control heat, delivering a benzene-rich, high-octane gasoline.

Explore the steam cracker plant from feed to finished products, covering naphtha and other feedstocks, 800°C cracking, and downstream production of ethylene, propylene, butadiene, and benzene.

This bonus lecture offers a music-themed interlude within the steam cracking process course, enriching petrochemicals and oil and gas studies with a light, engaging break.