Petroleum naphtha

This article is about naphthas derived from crude oil. For the hydrocarbon mixture derived from a number of natural sources, see naphtha.

Petroleum naphtha is an intermediate hydrocarbon liquid stream derived from the refining of crude oil[1][2][3] with CAS-no 64742-48-9.[4] It is most usually desulfurized and then catalytically reformed, which rearranges or restructures the hydrocarbon molecules in the naphtha as well as breaking some of the molecules into smaller molecules to produce a high-octane component of gasoline (or petrol).

There are hundreds of different petroleum crude oil sources worldwide and each crude oil has its own unique composition or assay. There are also hundreds of petroleum refineries worldwide and each of them is designed to process either a specific crude oil or specific types of crude oils. Naphtha is a general term as each refinery produces its own naphthas with their own unique initial and final boiling points and other physical and compositional characteristics.

Naphthas may also be produced from other material such as coal tar, shale deposits, tar sands, and the destructive distillation of wood.[5][6]

Source

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The first unit operation (after being desalinated) in a petroleum refinery is the crude oil distillation unit. The overhead liquid distillate from that unit is called virgin or straight-run naphtha and that distillate is the largest source of naphtha in most petroleum refineries. The naphtha is a mixture of many different hydrocarbon compounds. It has an initial boiling point (IBP) of about 35 °C and a final boiling point (FBP) of about 200 °C, and it contains paraffins, naphthenes (cyclic paraffins) and aromatic hydrocarbons ranging from those containing 4 carbon atoms to those containing about 10 or 11 carbon atoms.

The virgin naphtha is often further distilled into two streams:[7]

  • a virgin light naphtha with an IBP of about 30 °C and a FBP of about 145 °C containing most (but not all) of the hydrocarbons with six or fewer carbon atoms
  • a virgin heavy naphtha containing most (but not all) of the hydrocarbons with more than six carbon atoms. The heavy naphtha has an IBP of about 140 °C and a FBP of about 205 °C.

The virgin heavy naphtha is usually processed in a catalytic reformer, because the light naphtha has molecules with six or fewer carbon atoms—which, when reformed, tend to crack into butane and lower molecular weight hydrocarbons that are not useful as high-octane gasoline blending components. Also, the molecules with six carbon atoms tend to form aromatics, which is undesirable because the environmental regulations of a number of countries limit the amount of aromatics (most particularly benzene) in gasoline.[8][9][10]

Types of virgin naphthas

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The table below lists some typical virgin heavy naphthas, available for catalytic reforming, derived from various crude oils. It can be seen that they differ significantly in their content of paraffins, naphthenes and aromatics:

Typical heavy naphthas
Crude oil name
Location 		Barrow Island
Australia[11] 		Mutineer-Exeter
Australia[12] 		CPC Blend
Kazakhstan[13] 		Draugen
North Sea[14]
Initial boiling point, °C 150 140 149 150
Final boiling point, °C 200 190 204 180
Paraffins, liquid volume % 46 62 57 38
Naphthenes, liquid volume % 42 32 27 45
Aromatics, liquid volume % 12 6 16 17

Cracked naphthas

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Some refinery naphthas also contain some olefinic hydrocarbons, such as naphthas derived from the fluid catalytic cracking, visbreakers and coking processes used in many refineries. Those olefin-containing naphthas are often referred to as cracked naphthas.

In some (but not all) petroleum refineries, the cracked naphthas are desulfurized and catalytically reformed (as are the virgin naphthas) to produce additional high-octane gasoline components.

Other uses

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Some petroleum refineries also produce small amounts of specialty naphthas for use as solvents, cleaning fluids and dry-cleaning agents, paint and varnish diluents, asphalt diluents, rubber industry solvents, recycling products, and cigarette-lighter, portable-camping-stove and lantern fuels. Those specialty naphthas are subjected to various purification processes which adjusts chemical characteristics to suit specific needs.

Specialty naphtha comes in many varieties and each are referred to by separate names such as petroleum ether, petroleum spirits, mineral spirits, paraffin, benzine, hexane, ligroin, white oil or white gas, painters naphtha, refined solvent naphtha and Varnish makers' & painters' naphtha (VM&P). The best way to determine the boiling point and other compositional characteristics of any of the specialty naphtha is to read the Safety Data Sheet (SDS) for the specific naphtha of interest. Safety Data Sheets can be found on a chemical suppliers websites or by contacting the supplier directly.

On a much larger scale, petroleum naphtha is also used in the petrochemicals industry as feedstock to steam reformers and steam crackers for the production of hydrogen (which may be and is converted into ammonia for fertilizers), ethylene, and other olefins. Natural gas is also used as feedstock to steam reformers and steam crackers.

Safety

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People can be exposed to petroleum naphtha in the workplace by breathing it, swallowing it, skin contact, and eye contact. The Occupational Safety and Health Administration (OSHA) set the legal limit (permissible exposure limit) for petroleum naphtha exposure in the workplace as 500 ppm (2000 mg/m3) over an 8-hour workday. The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 350 mg/m3 over an 8-hour workday and 1800 mg/m3 over 15 minutes. At levels of 1100 ppm, 10% of the lower explosive limit, petroleum naphtha is immediately dangerous to life and health.[15]

References

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This article incorporates material from the Citizendium article "Petroleum naphtha", which is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License but not under the GFDL.
  1. ^ Gary, James H.; Handwerk, Glenn E. (1993). Petroleum Refining Technology and Economics (Second ed.). Marcel Dekker. ISBN 0-8247-7150-8.
  2. ^ Leffler, William L. (1985). Petroleum Refining for the Nontechnical Person (Second ed.). PennWell Books. ISBN 0-87814-280-0.
  3. ^ Speight, James G. (2006). The Chemistry and Technology of Petroleum (Fourth ed.). CRC Press. ISBN 0-8493-9067-2.
  4. ^ "Naphtha (petroleum), hydrotreated heavy". European Chemicals Agency.
  5. ^ Exploiting the Benefits of Fischer-Tropsch Technology Archived 2010-08-16 at the Wayback Machine (Sasol’s integrated business model)
  6. ^ Beychok, Milton R. (May 1975). Process and Environmental Technology for Producing SNG and Liquid Fuels (Report). United States Environmental Protection Agency. EPA-660/2-75-011.
  7. ^ Fuel Chemistry (scroll down to "What is naphtha")
  8. ^ Canadian regulations on benzene in gasoline Archived 2004-10-12 at the Wayback Machine
  9. ^ Briefing on Benzene in Petrol Archived 2007-07-30 at the Wayback Machine From website of United Kingdom Petroleum Industry Association (UKPIA)
  10. ^ Eilperin, Juliet (March 2, 2006). "EPA Seeks Less Benzene in Gasoline". The Washington Post.
  11. ^ "Barrow Island - Summary of Major Cuts" (PDF). Santos. October 10, 2001. Archived from the original (PDF) on November 30, 2010.
  12. ^ "Mutineer-Exeter Crude Oil Production Assay" (PDF). Santos. September 2005. Archived from the original (PDF) on November 29, 2010.
  13. ^ "Tengiz Assay CPC Blend Assay" (PDF). Chevron Crude Marketing. Tengizchevroil. February 1, 2007. Archived from the original on July 22, 2011.
  14. ^ "Crude Oil Assay: Draugen" (PDF). Statoil. January 21, 2003. Archived from the original (PDF) on July 19, 2011.
  15. ^ "Petroleum distillates (naptha)". National Institute for Occupational Safety and Health. Retrieved November 27, 2015.
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