Orimulsion is a registered

trademark A trademark (also written trade mark or trade-mark) is a type of intellectual property consisting of a recognizable sign, design, or expression that identifies products or services from a particular source and distinguishes them from ot ...

name for a

bitumen Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term a ...

-based fuel that was developed for industrial use by Intevep, the Research and Development Affiliate of

Petroleos de Venezuela Petróleos de Venezuela, S.A. (PDVSA, ) (English: Petroleum of Venezuela) is the Venezuelan state-owned oil and natural gas company. It has activities in exploration, production, refining and exporting oil as well as exploration and production ...

SA (PDVSA), following earlier collaboration on oil emulsions with BP.

Source of the bitumen

Like coal and oil, bitumen occurs naturally and is obtained from the world's largest deposit in the

Orinoco Belt The Orinoco Belt is a territory in the southern strip of the eastern Orinoco River Basin in Venezuela which overlies the world's largest deposits of petroleum. Its local Spanish name is ''Faja Petrolífera del Orinoco'' (Orinoco Petroleum Belt). T ...

Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...

. The deposit is estimated to be more than 1,300 billion

barrel A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is wide. They are traditionally made of wooden staves and bound by wooden or metal hoops. The word vat is often used for large containers for liquids, ...

s (190 billion m³) of bitumen, an amount approximately equivalent to the world's estimated proven

oil reserves An oil is any nonpolar chemical substance that is composed primarily of hydrocarbons and is hydrophobic (does not mix with water) & lipophilic (mixes with other oils). Oils are usually flammable and surface active. Most oils are unsaturate ...

Preparation

Raw bitumen has an extremely high

viscosity The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Viscosity quantifies the int ...

and specific gravity between 8 and 10

API gravity The American Petroleum Institute gravity, or API gravity, is a measure of how heavy or light a petroleum liquid is compared to water: if its API gravity is greater than 10, it is lighter and floats on water; if less than 10, it is heavier and sink ...

, at

ambient temperature Colloquially, "room temperature" is a range of air temperatures that most people prefer for indoor settings. It feels comfortable to a person when they are wearing typical indoor clothing. Human comfort can extend beyond this range depending on ...

s and is unsuitable for direct use in conventional power stations. Orimulsion is made by mixing the bitumen with about 30% fresh water and a small amount of

surfactant Surfactants are chemical compounds that decrease the surface tension between two liquids, between a gas and a liquid, or interfacial tension between a liquid and a solid. Surfactants may act as detergents, wetting agents, emulsion#Emulsifiers , ...

. The result behaves similarly to

fuel oil Fuel oil is any of various fractions obtained from the distillation of petroleum (crude oil). Such oils include distillates (the lighter fractions) and residues (the heavier fractions). Fuel oils include heavy fuel oil, marine fuel oil (MFO), b ...

. An

alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...

-based surfactant recently replaced the original

phenol Phenol (also called carbolic acid) is an aromatic organic compound with the molecular formula . It is a white crystalline solid that is volatile. The molecule consists of a phenyl group () bonded to a hydroxy group (). Mildly acidic, it r ...

-based version; improving the transport properties of the fuel and eliminating the health concerns associated with the phenol group of surfactants.

Advantages

As a fuel for electricity generation, Orimulsion has a number of attractive characteristics: * the known reserves of bitumen are very large; * it is currently priced to be competitive with internationally traded coal; * it is relatively easy and safe to produce, transport, handle and store; * it is easy to ignite and has good combustion characteristics; * it can be used in power stations designed to run on coal or

heavy fuel oil Heavy Fuel Oil (HFO) is a category of fuel oils of a tar-like consistency. Also known as bunker fuel, or residual fuel oil, HFO is the result or remnant from the distillation and cracking process of petroleum. For this reason, HFO is contaminate ...

, with suitable modification.

Disadvantages

If there is a spill while shipping over water the mixture de-emulsifies and the bitumen drops out of suspension. It is a

non-Newtonian fluid A non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for ex ...

, and if it is allowed to cool below 30

°C The degree Celsius is the unit of temperature on the Celsius scale (originally known as the centigrade scale outside Sweden), one of two temperature scales used in the International System of Units (SI), the other being the Kelvin scale. The d ...

, it will 'set'. Pumping becomes impossible, and there is no way of restarting operations or the flow through the pipeline again.

Decreasing usage

Orimulsion is currently used as a commercial boiler fuel in power plants worldwide (''e.g.'',

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the n ...

Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...

and

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's List of countries and dependencies by population, most populous country, with a Population of China, population exceeding 1.4 billion, slig ...

). Use of fuel used to be much wider and demand was increasing. However, many of PDVSA's engineers were fired following the

Venezuelan general strike of 2002–03 Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th ...

. Orimulsion had been the pride of the PDVSA engineers, so Orimulsion fell out of favor with the key political leaders. As a result, the government is trying to "Wind Down" the Orimulsion program. The one exception is the sales of Orimulsion to

. The Venezuelan government has close ties to China, as it has with

Cuba Cuba ( , ), officially the Republic of Cuba ( es, República de Cuba, links=no ), is an island country comprising the island of Cuba, as well as Isla de la Juventud and several minor archipelagos. Cuba is located where the northern Caribb ...

. The result is that China is still supplied with Orimulsion, while the rest of the world has either had their supplies terminated, or are still experiencing the "Wind Down" phase. Orimulsion still has excellent potential for domestic consumption. Another reason given by current PDVSA management is that with rising crude oil prices, it has been found that mixing or diluting Orinoco bitumen (extra-heavy oil) with a lighter crude oil can make this blend more profitable as a crude oil on the world market than by selling it as Orimulsion. An example of this is the popular Merey blend (Orinoco bitumen and Mesa crude oil). ConocoPhillips along with PDVSA operate the Merey Sweeny (bpd) delayed coker, vacuum tower and related facilities at ConocoPhillips' refinery in Sweeny, Texas, U.S.A. for processing and upgrading heavy sour Merey crude oil. Air pollutant control technology that is commonly available can limit emissions from Orimulsion to levels considered "

Best Available Control Technology A State Implementation Plan (SIP) is a United States state plan for complying with the federal Clean Air Act, administered by the Environmental Protection Agency (EPA). The SIP, developed by a state agency and approved by EPA, consists of narrat ...

", as defined by the

United States Environmental Protection Agency The Environmental Protection Agency (EPA) is an independent executive agency of the United States federal government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it ...

References

External links

Petroleum products Venezuelan inventions Venezuelan brands