The Crude Distillation Unit (CDU) is where crude oil enters a refinery and is / learning-centre/how-it-worksthe-refining-process/ Oil refinery or petroleum refinery is an industrial process plant where crude oil is transformed .. The crude oil distillation unit (CDU) is the first processing unit in virtually all petroleum refineries. The CDU distills the incoming crude oil into. Petroleum refining processes are the chemical engineering processes and other facilities used . The crude oil distillation unit (CDU) is the first processing unit in virtually all petroleum refineries. The CDU distills the incoming crude oil into.

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Oil refinery or petroleum refinery is an industrial process plant where crude oil vfu transformed and refined into more useful products such as petroleum naphthagasolinediesel fuelasphalt baseheating oilkeroseneliquefied petroleum gasjet fuel and fuel oils.

Oil proocess are typically large, sprawling industrial complexes with extensive piping running throughout, carrying streams of fluids between large chemical processing units, such as distillation columns.

In many ways, oil refineries use much of the technology of, and can be thought of, as types of chemical plants. The crude oil feedstock has typically been processed by an oil production plant.

There is usually an oil depot at or near an oil refinery for the storage of incoming crude oil feedstock as well as bulk liquid products.

Petroleum refineries are very large industrial complexes that involve many different processing procesa and auxiliary facilities such as utility units and storage tanks. Each refinery has its own unique arrangement and combination of refining processes largely determined by the refinery location, desired products and economic considerations. An oil refinery is considered an essential part of the downstream side of the petroleum industry.

Some modern petroleum refineries process as much astobarrelstocubic meters of crude oil per day. According to the Oil and Gas Journal in the world a total of refineries were operated on the 31 December for a total capacity of Jamnagar Refinery is the largest oil refinery, since 25 Decemberwith a processing capacity of 1. Located in GujaratIndia, it is owned by Reliance Industries. The Chinese were among the first civilizations to refine oil. The troops would then fill iron cans vd refined oil and throw them toward the enemy troops, causing a fire – effectively the world’s first ” fire bomb “.

The workshop was one of the world’s earliest oil refining factories where thousands of people worked to produce Chinese oil powered weaponry. Prior to the nineteenth century, petroleum was known and utilized in various fashions in Babylon proess, EgyptChinaPhilippinesRome and Azerbaijan.

However, the modern history of the petroleum industry is said to have begun in when Abraham Gessner of Nova ScotiaCanada devised a process to produce kerosene from coal. Shortly thereafter, inIgnacy Lukasiewicz began producing kerosene from hand-dug oil wells near the town of KrosnoPoland. In the early twentieth century, the introduction of the internal combustion engine and its use in automobiles created a market for gasoline that was the impetus for fairly rapid growth of the petroleum industry.

The early finds of petroleum like those in Ontario and Pennsylvania were soon outstripped by large oil “booms” in OklahomaTexas and California. Another close contender for the title of hosting the world’s oldest oil refinery is Salzbergen in Lower SaxonyGermany.

Salzbergen’s refinery was opened in At one point, the refinery in Ras TanuraSaudi Arabia owned by Saudi Aramco was claimed to be the largest oil refinery in the world. For most of the 20th century, the largest refinery was the Abadan Refinery in Iran.

Oil refinery – Wikipedia

This refinery suffered extensive damage during the Iran—Iraq War. Prior to World War Vdi in the early s, most petroleum refineries in the United States consisted simply of crude oil distillation units often referred to as atmospheric crude oil distillation units.

Some refineries also had vacuum distillation units as well as thermal cracking units such as visbreakers viscosity breakers, units to lower the viscosity of the oil. All of the many other refining processes discussed below were developed during the war or within a few years after the war. They became commercially available within 5 to 10 years after the war ended and the worldwide petroleum industry experienced very rapid growth.


The driving force for that growth in technology and in the number and size cvu refineries worldwide was the growing demand for automotive gasoline and aircraft fuel. In the United States, for various complex economic and political reasons, the construction of new refineries came to a virtual stop in about the s.

The size of oil refining market in was valued over USD 6 trillion in and is set to witness a consumption of over million barrels per day MBPD by Oil refining market will witness an appreciable growth because of rapid industrialization and economic transformation. Changing demographics, growing population and improvement in living standards across ccdu nations are some of factors positively influencing the industry landscape.

In the 19th century, refineries in the U. There cxu no market for the cddu volatile fraction, including gasoline, which was considered waste and was often dumped directly into the nearest river. The invention of the automobile shifted the demand to gasoline and diesel, which remain ;rocess primary refined products today. Today, national and state legislation require refineries to meet stringent air and water cleanliness standards. In fact, oil companies in the U.

In the earliest data providedthe United States operated refineries with a combined capacity of Inthere were operable U. Indeed, in order to reduce operating costs and depreciation, refining is operated in fewer sites but of bigger capacity. In throughas revenue streams in the oil business dried up and profitability of oil refineries fell due to lower demand for product and high reserves of supply preceding the economic recessionoil companies began to close or sell the less profitable refineries.

Raw or unprocessed crude oil is not generally useful in processs applications, although “light, sweet” low viscosity, low sulfur crude oil has been used directly as a burner fuel to produce steam for the propulsion of seagoing vessels. The lighter elements, however, form explosive vapors in the fuel tanks and are therefore hazardous, especially in warships. Instead, the hundreds of different hydrocarbon molecules in crude oil are separated in a refinery into components which can be used as fuelslubricantsand as feedstocks in petrochemical processes that manufacture such products as plasticsdetergentssolventselastomers and fibers such as nylon and polyesters.

Petroleum fossil fuels are burned in internal combustion engines to provide power for shipsautomobilesaircraft engineslawn mowersdirt bikes prpcess, and other provess. Different boiling points allow the hydrocarbons to be separated by distillation.

Since proces lighter liquid products are in great demand for use in internal combustion engines, a modern refinery will convert heavy hydrocarbons and vdj gaseous elements into these higher value products.

Petroleum refining processes – Wikipedia

Oil can be used in a variety of ways because it contains hydrocarbons of varying molecular massesforms and lengths such as paraffinsaromaticsnaphthenes or cycloalkanesalkenesdienesand alkynes.

While the molecules in crude oil include different atoms such as sulfur and nitrogen, the hydrocarbons are the most common form of molecules, which are molecules of varying lengths and complexity made of hydrogen and carbon atomsand a small number of oxygen atoms.

The differences in the structure of these molecules account for their varying physical and chemical propertiesvd it is this variety that makes crude oil useful in a broad range of several applications.

Once separated and purified of any contaminants and impurities, the fuel or lubricant can be sold without further processing.

Smaller molecules such as isobutane and propylene or butylenes can be recombined to meet specific octane requirements by processes such as alkylationor more commonly, dimerization.

The octane grade of gasoline can also be improved by catalytic reformingwhich involves removing hydrogen from hydrocarbons producing compounds with higher octane ratings such as aromatics. Intermediate products such as gasoils can even be reprocessed to break a heavy, long-chained oil into a lighter short-chained one, by various forms of cracking such as fluid catalytic crackingthermal crackingand hydrocracking. The final step in gasoline production is cdi blending of fuels with different octane ratings, vapor pressuresand other properties to meet product specifications.

Another method for reprocessing and upgrading these ptocess products residual oils uses a devolatilization [ permanent dead link ] process to separate usable oil from the waste asphaltene material.

Oil refineries are large scale plants, processing about a hundred thousand to several hundred thousand barrels of crude oil a day. Because of the high capacity, many of the units operate continuouslyas opposed to processing in batchesat steady state or nearly steady state for months to years. The high capacity also makes process optimization and advanced process control very desirable.


Oil refinery

Petroleum products are materials derived from crude oil petroleum as it vru processed in oil refineries. The majority of petroleum is converted to petroleum products, which includes several classes of fuels. Oil refineries also produce various intermediate products such as hydrogen pocess, light hydrocarbons, reformate and pyrolysis gasoline.

These are not usually transported but instead are blended or processed further on-site. Chemical plants are thus often adjacent to oil refineries or a number of further chemical processes are integrated into it. For example, light hydrocarbons are steam-cracked in an ethylene plant, and the produced ethylene is polymerized to produce polyethene.

Because technical reasons and environment protection demand a very low sulfur content in all but the heaviest products, it is transformed to hydrogen sulfide via catalytic hydrodesulfurization and removed from the product stream via amine gas treating. Using the Claus processhydrogen sulfide is afterwards transformed to elementary sulfur to be sold to the chemical industry.

The rather large heat energy freed by this process is directly used in the other parts of the refinery. Often an electrical power plant is combined into the whole refinery process to take up the excess heat. According to the composition of the crude oil and depending on the demands of the market, refineries can produce different shares of petroleum products. The largest share of oil products is used as “energy carriers”, i. These fuels include or can be blended to give gasoline, jet fueldiesel fuelheating oiland heavier fuel oils.

Heavier less volatile fractions can also be used to produce asphalttarparaffin waxlubricating and other heavy oils. Refineries also produce other chemicalssome of which are used in chemical processes to produce plastics and other useful materials. Since petroleum often contains a few percent sulfur -containing molecules, elemental sulfur is also often produced as a petroleum product. Carbonin the form of petroleum cokeand hydrogen may also be produced procesd petroleum products.

The hydrogen procwss is often used as an intermediate product for other oil refinery processes such as hydrocracking and hydrodesulfurization. Petroleum products are usually grouped into four categories: These require blending various feedstocks, mixing appropriate additives, providing short term storage, and preparation for bulk loading to trucks, barges, product ships, and railcars. This classification is based on the way crude oil is distilled and separated into fractions.

Over 6, items are made from petroleum waste by-products including: See link to partial list of by-products listed by Ranken Energy [25].

Sample of Crude oil petroleum. Cylinders of Liquified petroleum gas.

CDU-VDU Revamps

Pile of asphalt -covered aggregate for formation into asphalt concrete. The image below is a schematic flow diagram of a typical oil refinery [30] that depicts the various unit processes and the flow of intermediate product streams that occurs between the inlet crude oil feedstock and the final end products. The diagram depicts only one of the literally hundreds of different oil refinery configurations. The diagram also does not include any of the usual refinery facilities providing utilities such as steam, cooling water, and electric power as well as storage tanks for crude oil feedstock and for intermediate products and end products.

There are many process configurations other than that depicted above. For example, the vacuum distillation unit may also produce fractions that can be refined into end products such as: The crude oil distillation unit CDU is the first processing unit in virtually all petroleum refineries.

The CDU distills the incoming crude oil into various fractions of different boiling ranges, each of which are then processed further in the other refinery processing units. The CDU is often referred to as the atmospheric distillation unit because it operates at slightly above atmospheric pressure.

Below is a schematic flow diagram of a typical crude oil distillation unit. The incoming crude oil is preheated by exchanging heat with some of the hot, distilled fractions and other streams. It is then desalted to remove inorganic salts primarily sodium chloride. Following the desalter, the crude oil is further heated by exchanging heat with some of the hot, distilled fractions and other streams.