refinery

refinery
Name	Refinery
Caption	A typical petroleum refinery complex at night.
Industry	Oil & Gas, Chemical industry
Products	Gasoline, Diesel fuel, Jet fuel, Heating oil, Petrochemical feedstocks
Related	Chemical plant, Fractional distillation, Cracking (chemistry)

refinery. A refinery is an industrial processing plant designed to transform crude raw materials, most notably crude oil, into usable products and chemical feedstocks. These facilities are critical nodes in the global energy and manufacturing supply chains, employing complex physical and chemical processes. The modern refinery is a large-scale, capital-intensive operation, often integrated with petrochemical production and logistics infrastructure like pipelines and marine terminals.

Overview

The primary function is the conversion of crude oil, a mixture of hydrocarbons, into valuable fractions such as motor gasoline and aviation fuel. The development of refineries paralleled the rise of the internal combustion engine and the modern petroleum industry, with early facilities like those in Ploiești and Cleveland paving the way. Today, refineries vary greatly in complexity, from simple topping units to advanced conversion refineries that maximize output of high-demand products. Key enabling technologies include fractional distillation, developed from earlier work by William Henry Perkin and others, and various catalytic processes.

Types of refineries

Refineries are categorized by their processing capabilities and feedstock. A petroleum refinery processes crude oil, while a gas processing plant treats natural gas and natural gas liquids. Sugar refineries, such as those historically important in Havana and Louisiana, process sugar cane or sugar beet. Metal refineries include facilities for aluminum (like those operated by Alcoa), copper, and precious metals like those at the Rand Refinery in South Africa. Specialized facilities also exist for salt and vegetable oils.

Process and operations

Core operations begin with distillation, where crude oil is heated in a fractionating column to separate components by boiling point. Lighter fractions like liquefied petroleum gas and naphtha are drawn off the top, while heavier residues settle at the bottom. Further processing involves catalytic cracking, using units like the FCC unit invented by Eugene Houdry, to break heavy molecules into lighter ones. Hydrocracking and hydrotreating, often employing catalysts from companies like Albemarle Corporation, remove impurities such as sulfur to produce cleaner fuels. Alkylation and isomerization processes enhance octane rating.

Products and byproducts

The primary outputs are transportation fuels, including gasoline, diesel, and jet fuel used by airlines like Delta Air Lines and Lufthansa. Other key products are heating oil, lubricants, asphalt, and petroleum coke. Refineries also produce vital petrochemical feedstocks like ethylene, propylene, and benzene, which are building blocks for plastics, synthetic rubber, and solvents. Byproducts can include sulfur, sold for use in sulfuric acid production, and hydrogen, used in further refining processes or fuel cell applications.

Economic and environmental considerations

Refineries are major economic engines, providing employment and tax revenue in regions like the U.S. Gulf Coast and Rotterdam-Rijnmond. They are sensitive to fluctuations in the crude oil price and crack spread. Environmental impacts are significant, leading to strict regulations under acts like the U.S. Clean Air Act. Emissions of sulfur dioxide, nitrogen oxides, and volatile organic compounds are controlled, and wastewater is treated. Incidents like the Texas City Refinery explosion and the BP Deepwater Horizon oil spill highlight operational risks. The industry faces long-term challenges from energy transition policies promoting renewable energy.

Major refining regions

Global refining capacity is concentrated in key industrial corridors. The largest regional concentration is along the Gulf Coast of the United States, centered on Houston and Port Arthur. In Asia, major hubs include Jamnagar in India, operated by Reliance Industries, and complexes in Singapore and Zhejiang. Europe's major refining center is the Port of Rotterdam area. The Middle East has seen significant expansion, with large facilities in Ras Tanura (Saudi Aramco) and Jubail. Other significant capacities exist in Russia (e.g., Omsk), South Korea (Ulsan), and Venezuela (Paraguana Refinery Complex).

Category:Industrial buildings and structures Category:Chemical engineering Category:Oil and gas industry