In this post we will be looking at meaning of petroleum and its Formation, Petroleum refining processes and Main Processing Units of Refineries. This contain a link for Compressed Natural Gas (CNG) and the Benefits.
INTRODUCTION
Prior to the nineteenth century, petroleum was known and utilized in various fashions in Babylon, Egypt, China, Philippines, Rome and along the Caspian Sea. The modern history of the petroleum industry is said to have begun in 1846 when Abraham Gessner of Nova Scotia, Canada devised a process to produce kerosene from coal. Shortly thereafter, in 1854, Ignacy Lukasiewicz began producing kerosene from hand-dug oil wells near the town of Krosno, Poland. The first large petroleum refinery was built in Ploesti, Romania in 1856 using the abundant oil available in Romania.
In North America, the first oil well was drilled in 1858 by James Miller Williams in Ontario, Canada. In the United States, the petroleum industry began in 1859 when Edwin Drake found oil near Titusville, Pennsylvania. The industry grew slowly in the 1800s, primarily producing kerosene for oil lamps. 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 Oklahoma, Texas and California.
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Prior to World War II in the early 1940s, 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 of refineries worldwide was the growing demand for automotive gasoline and aircraft fuel.
What is Petroleum?
Petroleum is a substance that occurs naturally. It is a dark liquid. It occurs beneath the earth’s surface. A large number of products like petrol, diesel, lubricating oil, etc. derive from petroleum. Its compounds can be separated with the help of fractional distillation. In the year 2006, primary sources of energy consisted of petroleum 36.8%, natural gas 22.9%, and coal 26.6% share for fossil fuels in primary energy production in the world.
Petroleum Formation.
It takes around millions of years for petroleum to form. It is formed due to the presence of decomposed carcasses of dead animals beneath the surface of the earth. These carcasses of dead animals are subjected to extreme pressure and heat. Over centuries, millions of animals lived and died to become fossilized, just in case of plant-based matter. Similarly, in the ocean, oceanic creatures drowned to the bottom of the ocean and got buried under the sand and rocks.
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Decayed due to the presence of bacteria, the decomposed organic matter got buried deeper and deeper over the years. Over millions of years, high temperature, high pressure, the absence of air converted the dead animals to petroleum and coal. This liquefied form of dead organic matter is petroleum or crude oil. Crude oil is extracted from oil wells, these wells can be very deep. The oil extracted is later refined to form petrol, diesel, aviation fuel, paraffin wax, lubrication oil, etc.
Petroleum refining processes
Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries (also referred to as oil refineries) to transform crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils. Refineries are very large industrial complexes that involve many different processing units 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. Some modern petroleum refineries process as much as 800,000 to 900,000 barrels (127,000 to 143,000 cubic meters) per day of crude oil.
Deposition of petroleum occurs with natural gas in the rocks called oil wells from where it is taken out by drilling. Refining is a process where the separation of various compounds of crude oil occurs. Fractional distillation is a process used to separate its compounds. Crude Oil procured from an oil well is a mixture of many liquids. Different temperature evaporates a different liquid. This temperature is the boiling point of that liquid. The crude oil is heated to a temperature of 400-degree Celcius, is fed in at the bottom of the column and heated further. The liquid with the lowest boiling point changes into vapor first and condenses. At higher temperature, the next volatile liquid changes into a vapor state and rises.
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Main Processing Units of Refineries
- Crude Oil Distillation unit: Distills the incoming crude oil into various fractions for further processing in other units.
- Vacuum distillation unit: Further distills the residue oil from the bottom of the crude oil distillation unit. The vacuum distillation is performed at a pressure well below atmospheric pressure.
- Naphtha hydrotreater unit: Uses hydrogen to desulfurize the naphtha fraction from the crude oil distillation or other units within the refinery.
- Catalytic reforming unit: Converts the desulfurized naphtha molecules into higher-octane molecules to produce reformate, which is a component of the end-product gasoline or petrol.
- Alkylation unit: Converts isobutane and butylenes into alkylate, which is a very high-octane component of the end-product gasoline or petrol.
- Isomerization unit: Converts linear molecules such as normal pentane into higher-octane branched molecules for blending into the end-product gasoline. Also used to convert linear normal butane into isobutane for use in the alkylation unit.
- Distillate hydrotreater unit: Uses hydrogen to desulfurize some of the other distilled fractions from the crude oil distillation unit (such as diesel oil).
- Merox (mercaptan oxidizer) or similar units: Desulfurize LPG, kerosene or jet fuel by oxidizing undesired mercaptans to organic disulfides.
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- Amine gas treater, Claus unit, and tail gas treatment for converting hydrogen sulfide gas from the hydrotreaters into end-product elemental sulfur. The large majority of the 64,000,000 metric tons of sulfur produced worldwide in 2005 was byproduct sulfur from petroleum refining and natural gas processing plants.
- Fluid catalytic cracking (FCC) unit: Upgrades the heavier, higher-boiling fractions from the crude oil distillation by converting them into lighter and lower boiling, more valuable products.
- Hydrocracker unit: Uses hydrogen to upgrade heavier fractions from the crude oil distillation and the vacuum distillation units into lighter, more valuable products.
- Visbreaker unit upgrades heavy residual oils from the vacuum distillation unit by thermally cracking them into lighter, more valuable reduced viscosity products.
- Delayed coking and fluid coker units: Convert very heavy residual oils into end-product petroleum coke as well as naphtha and petrol oil by-products.
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Auxiliary Processing Units of Refineries
- Steam reforming unit: Converts natural gas into hydrogen for the hydrotreaters and/or the hydrocracker.
- Sour water stripper unit: Uses steam to remove hydrogen sulfide gas from various wastewater streams for subsequent conversion into end-product sulfur in the Claus unit.
- Utility units such as cooling towers for furnishing circulating cooling water, steam generators, instrument air systems for pneumatically operated control valves and an electrical substation.
- Wastewater collection and treating systems consisting of API separators, dissolved air flotation (DAF) units and some type of further treatment (such as an activated sludge biotreater) to make the wastewaters suitable for reuse or for disposal.
- Liquified gas (LPG) storage vessels for propane and similar gaseous fuels at a pressure sufficient to maintain them in liquid form. These are usually spherical vessels or bullets (horizontal vessels with rounded ends).
- Storage tanks for crude oil and finished products, usually vertical, cylindrical vessels with some sort of vapour emission control and surrounded by an earthen berm to contain liquid spills.
Products produced in Petroleum Refining Process
- Petroleum Gas: Generally, liquefied petroleum gas is useful for domestic fuel.
- Gasoline: Procuration of petrol occurs from this fraction.
- Kerosene: It is used as domestic fuel and also as fuel in jet engines.
- Diesel oil or light oil: It is useful in the automobile industry.
- Heavy Oil or Lubricating Oil: This type of oil is used in making lubricating oils.
- Fuel Oil: It is essential for ships, central heating, and factories.
- Residue: We can procure products like paraffin wax, bitumen from this residue. It is useful for making roads and roofing.