Ethan Clarke
Oil is a key input for the production of plastic. Crude oil is a complex mixture of thousands of compounds, which need to be processed before they can be used. The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains, which differ in terms of the size and structure of their molecules. One of these fractions, naphtha, is a crucial compound for the production of plastics.
| Characteristics | Values |
|---|---|
| Is oil an input for plastic? | Yes, crude oil is a key input for plastic production. |
| Type of oil used | Crude oil, natural gas or coal are used as inputs for synthetic plastics. |
| Percentage of oil used for plastic | In Europe, 4-6% of oil reserves are used for plastic production. |
| Other uses of oil | Oil is also used for transport, electricity, heating, fertilizers, diesel, and gas. |
| Environmental impact | Oil-derived plastics cause environmental harm due to their persistence in the environment. |
| Alternatives to oil-based plastics | Biobased plastics derived from renewable products such as carbohydrates, starch, vegetable fats, oils, and bacteria. |
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What You'll Learn
- Crude oil is a complex mixture of thousands of compounds
- Distillation separates crude oil into distinct groups of chemicals
- Naphtha, a distillation product, is a crucial compound for plastic production
- Polymerisation is a process that converts gases into higher molecular weight hydrocarbons
- Oil-derived plastics cause environmental harm due to their persistence in the environment
Crude oil is a complex mixture of thousands of compounds
Crude oil is a naturally occurring, highly complex mixture of hydrocarbons, compounds made from combinations of carbon and hydrogen atoms that form chains of varying lengths, giving them different properties. These hydrocarbons are the earliest raw materials of plastic. Crude oil is found in liquid form in natural underground reservoirs and remains liquid at atmospheric pressure after passing through surface separating facilities.
The exact composition of crude oil varies, and no two crude oils are exactly the same. However, they are typically made up of several hundred hydrocarbons and approximately 200 sulfur compounds. They also contain small amounts of organic compounds of sulfur, oxygen, and nitrogen, as well as trace amounts of metallic compounds of vanadium, nickel, and sodium. These metal compounds can cause problems during the refining process and in the resulting fuel oil.
The unique composition of each crude oil sample is determined by its type and origin. Crude oils may also be classified by their geological source, such as productive sands, sandstones, and limestones. The fractional and chemical compositions of crude oil from the same producing sand are usually very similar, even if they are drawn from different sources.
During the refining process, crude oil is heated in a furnace, separating the hydrocarbons into different groups based on the number of atoms they contain and their resulting molecular weight. The longer, heavier hydrocarbons sink to the bottom, while the shorter, lighter ones rise to the top. This process separates crude oil into several distinct groups of chemicals, including petroleum, gasoline, and paraffin. One of these groups, naphtha, is a crucial compound used to make a large amount of plastic.
Other useful substances made from compounds found in crude oil include solvents, lubricants, and detergents.
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Distillation separates crude oil into distinct groups of chemicals
Crude oil is a complex liquid comprising many different types of hydrocarbon chains. These hydrocarbons are the earliest raw materials of plastic. To separate these chains into similar lengths, fractional distillation is used in oil refineries. This process involves steaming hot water to boil the liquid and separate the distillates. Crude oil is heated in a furnace and sent to the distillation unit, where heavy crude oil separates into lighter components called fractions.
The distillation unit can be a tower or column, ranging from 0.5 to 6.0 metres in diameter and 6.0 to 60.0 metres tall. The lightest fluids, known as "top distillates", are at the top of the tower, while intermediate weight liquid fractions, such as kerosene and diesel oil distillates, linger in the middle. Heavier liquids, called gas oils, separate lower down, and the heaviest fractions settle at the bottom. Each fraction contains hydrocarbons of similar weight and length.
The fractions that are separated out include gasoline, diesel, kerosene, jet fuel, naphtha, light oil, heavy oil, and bitumen. These fractions are then used as feedstock for petrochemical crackers that produce the basic building blocks for making plastics. Naphtha, in particular, is a crucial compound for making a large amount of plastic.
It is important to note that the majority of plastic in use today is synthetic, derived from crude oil, natural gas, or coal. However, there is a growing demand for biobased plastics derived from renewable sources such as vegetable oils.
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Naphtha, a distillation product, is a crucial compound for plastic production
Plastic can either be synthetic or biobased. Synthetic plastics are derived from crude oil, natural gas, or coal, while biobased plastics come from renewable products such as carbohydrates, starch, vegetable fats, oils, bacteria, and other biological substances. The majority of plastic in use today is synthetic, due to the ease of manufacturing methods involved in processing crude oil. However, the growing demand for limited oil reserves is driving the need for newer plastics from renewable resources.
Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used to create plastic. The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains (chemical compounds made up of carbon and hydrogen), which differ in terms of the size and structure of their molecules.
Naphtha is one of these fractions. It is a crucial compound for the production of plastics. It is a mixture of C5 to C10 hydrocarbons, obtained by the distillation of crude oil. Naphtha is decomposed thermally at high temperatures in the presence of water vapor, where it splits into light hydrocarbons known as major intermediaries. These include olefins (such as ethylene and propylene) and aromatics (such as benzene, toluene, and xylene). These small molecules are then linked together into long molecular chains called polymers.
The process of converting naphtha into polymers involves two main methods: polymerization and polycondensation. Both methods require specific catalysts. In a polymerization reactor, monomers such as ethylene and propylene are linked together to form long polymer chains. These polymers can then be used to create plastics of different densities, ranging from flimsy and pliable to sturdy and tough. This makes their applications extremely diverse, and they are seen in everyday items such as milk cartons, plastic wrappers, straws, water bottles, shopping bags, and shampoo containers.
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Polymerisation is a process that converts gases into higher molecular weight hydrocarbons
Plastic can be synthetic or biobased. Synthetic plastics are derived from fossil fuels like crude oil, natural gas, and coal. Biobased plastics, on the other hand, are made from renewable sources such as vegetable oils and fats. Most of the plastic in use today is synthetic, primarily due to the ease of manufacturing methods involved in processing crude oil.
Crude oil is heated in a furnace and sent to a distillation unit, where it separates into lighter components called fractions. One of these fractions, naphtha, is a crucial compound for making plastic. However, plastic production can also use natural gas.
Polymerisation is a process in the petroleum industry that converts light olefin gases (gasoline) such as ethylene, propylene, and butylene (monomers) into higher molecular weight hydrocarbons (polymers). This process involves chemically bonding monomers into chains. There are two types of polymerisation mechanisms: addition polymerisation and condensation polymerisation.
Addition polymerisation occurs when one monomer connects to the next one (dimer) and the dimer to the next one (trimer), and so on. This process requires a catalyst, typically a peroxide. Common examples of addition polymers are polyethylene, polystyrene, and polyvinyl chloride.
Condensation polymerisation involves joining two or more different monomers by removing small molecules such as water. This process also requires a catalyst for the reaction between adjacent monomers. An example of condensation polymerisation is the formation of ethylene into polyethylene (PE). PE is a plastic resin used to make plastic pellets, which are then melted and moulded into various shapes.
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Oil-derived plastics cause environmental harm due to their persistence in the environment
Plastic is derived from fossil fuels, including natural gas and crude oil. The process of making plastic from oil involves heating the oil in a furnace, separating it into different groups based on the number of atoms and molecular weight, and then feeding it into a distillation tube. This process yields several distinct groups of chemicals, including naphtha, which is a crucial feedstock for plastic production.
Oil-derived plastics cause significant environmental harm due to their persistence in the environment. Plastic pollution has become ubiquitous, with microplastics found in every ecosystem on the planet, from the Antarctic tundra to tropical coral reefs. Research indicates that more than 1,500 species in marine and terrestrial environments ingest plastics, which can lead to punctured organs or intestinal blockages. Furthermore, the extraction, transportation, and refinement of oil, as well as the manufacturing and disposal of plastics, contribute to global warming by creating carbon emissions.
The long-term persistence of oil-derived plastics in the environment exacerbates their environmental impact. Plastic does not decompose naturally but breaks up into smaller pieces called microplastics, which can persist for centuries. These microplastics are ingested by marine species, leading to potential health risks and even death. Additionally, microplastics have been found in human organs, raising concerns about their impact on human health.
The production and use of oil-derived plastics contribute to climate change. In 2019, plastic products were responsible for 3.4% of global greenhouse gas emissions, with 90% of these emissions attributed to the production and conversion of fossil fuels into plastic. The refinement of plastics emits an additional 184 to 213 million metric tons of greenhouse gases annually. Furthermore, the extraction of fossil fuels and their transportation to plastic factories emit 1.5 to 12.5 million metric tons of greenhouse gases.
The environmental harm caused by oil-derived plastics is driving a need for newer plastics derived from renewable resources. While most plastic today is synthetic, there is a growing demand for biobased plastics made from renewable products such as carbohydrates, starch, vegetable fats, and oils. By transitioning to renewable sources for plastic production, we can reduce the environmental impact associated with oil-derived plastics and contribute to a cleaner and more sustainable world.
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Frequently asked questions
Yes, oil is an input for plastic.
Crude oil is the type of oil used to make plastic.
Crude oil is a complex mixture of thousands of compounds. It is made up of hydrocarbons, compounds made from combinations of carbon and hydrogen atoms that form chains of varying lengths, giving them different properties.
The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains (chemical compounds made up of carbon and hydrogen), which differ in terms of the size and structure of their molecules. One of these fractions, naphtha, is the crucial compound for the production of plastics.
Plastic can be made from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Plastic can either be 'synthetic' or 'biobased'. Synthetic plastics are derived from crude oil, natural gas or coal. Biobased plastics come from renewable products such as carbohydrates, starch, vegetable fats and oils, bacteria and other biological substances.
