Sofia Martinez
Plastic is derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil, a mixture of thousands of compounds, is the most common source of plastic. The production of plastic begins with the distillation of crude oil in an oil refinery, separating it into lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. Two processes are used to produce plastic: polymerisation and polycondensation. Synthetic plastics, which make up the majority of plastic in use today, are derived from crude oil, natural gas, or coal, while biobased plastics are made from renewable sources such as carbohydrates, starch, vegetable fats, and oils.
| Characteristics | Values |
|---|---|
| How it's made | By a reaction known as polymerisation, which can be performed in two different ways: addition polymerisation and condensation polymerisation |
| Common byproducts | Water, nylon (polyamide), polyester, polyurethane |
| What it's made from | Crude oil, natural gas, coal, carbohydrates, starch, vegetable fats and oils, bacteria, other biological substances |
| Plastic types | Polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene, PVC |
| Plastic uses | Packaging, building and construction, transportation, medical devices, light-weight construction materials |
| Plastic waste | 14% of plastic has been incinerated, less than 10% has been recycled |
| Plastic production | 400 million metric tons of plastic were produced worldwide in 2023 |
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What You'll Learn
Plastic is a byproduct of condensation polymerisation
Plastic is a synthetic material derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used to create plastic. This process involves the distillation of crude oil in an oil refinery, separating it into groups of lighter components called fractions. One of these fractions, naphtha, is the crucial compound for plastic production.
There are two main processes used to produce plastics: polymerisation and polycondensation. Polymerisation involves linking monomers such as ethylene and propylene to form long polymer chains. Polycondensation, also known as condensation polymerisation, is a form of step-growth polymerisation where linear polymers are produced from bifunctional monomers. In condensation polymerisation, two monomers combine to form a dimer (two units) by releasing a byproduct.
The most common byproduct of condensation polymerisation is water, which is easily treated and disposed of. Other byproducts can include valuable raw materials that can be recycled back into the feedstream. Examples of plastics formed through condensation polymerisation include nylon (polyamide), polyester, and polyurethane.
Condensation polymers tend to form more slowly than addition polymers and often require heat. They are generally lower in molecular weight, and the terminal functional groups on their chains remain active. This allows groups of shorter chains to combine into longer chains in the late stages of polymerisation. Condensation polymers are also more susceptible to hydrolytic molecular degradation through exposure to water at elevated temperatures.
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Fossil fuels are used to make plastic
Two main processes are used to produce plastics: polymerisation and polycondensation. In polymerisation, monomers such as ethylene and propylene are linked together to form long polymer chains. This can be done through addition polymerisation, where monomers are added together in a long chain with the help of a catalyst, or condensation polymerisation, where two monomers combine to form a dimer by releasing a byproduct. Synthetic plastics are produced by a reaction called polymerisation, which can be performed in two different ways. Biobased plastics, on the other hand, are derived from renewable sources such as carbohydrates, starch, vegetable fats, and oils.
The vast 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. Plastic has become dominant since the early 20th century due to its versatility, durability, and lightweight properties, with primary uses in packaging, construction, transportation, and healthcare. However, plastic waste has become a significant environmental concern due to its slow decomposition rate and the resulting pollution in waterways and oceans.
The fossil fuel and plastic industries are deeply connected, with over 99% of plastic made from chemicals sourced from fossil fuels. The shale gas boom in the United States, for example, has fuelled the expansion of plastic infrastructure. This wave of investment in plastic production increases pollution risks and undermines efforts to combat the growing plastic crisis.
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Naphtha is a crucial compound for plastic production
Plastic is a synthetic material derived from crude oil, natural gas, or coal. Crude oil, a complex mixture of thousands of compounds, must be processed before it can be used to create plastic. This process begins with the distillation of crude oil in an oil refinery, which separates the heavy crude oil into lighter components called fractions. Each fraction is a mixture of hydrocarbon chains, which differ in terms of their molecular size and structure.
One of these fractions, naphtha, is a crucial compound for plastic production. Naphtha is a term used to describe a group of volatile mixtures of liquid hydrocarbons, obtained by the distillation of crude oil. It is a mixture of C5 to C10 hydrocarbons. While naphtha is a crucial compound in the production of plastic, it is not the only one. Other compounds, such as natural gas, cellulose, salt, and coal, are also used. However, naphtha is unique in that it is a byproduct of crude oil, which is the most common feedstock for plastic production.
The process of converting naphtha into plastic involves thermal decomposition at high temperatures of around 800°C in a steam cracker in the presence of water vapour. This causes the naphtha to split into light hydrocarbons known as major intermediaries. These light hydrocarbons are then converted into higher molecular weight hydrocarbons, which are the building blocks of plastic.
In summary, naphtha is a crucial compound for plastic production because it is a byproduct of crude oil that serves as a raw material for key processes such as polymerisation and polycondensation. Through thermal decomposition and conversion into higher molecular weight hydrocarbons, naphtha ultimately contributes to the formation of the solid synthetic product we know as plastic.
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Plastic is derived from natural, organic materials
Plastic is a synthetic material composed primarily of polymers. The first fully synthetic plastic was Bakelite, made from phenol and formaldehyde resin. It was invented in 1906/1907 by Leo Baekeland, who coined the term "plastics". The word "plastic" comes from the Greek "plastikos", meaning "capable of being shaped or moulded".
Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt, and crude oil. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used to make plastic. The production of plastics begins with the distillation of crude oil in an oil refinery, which separates the heavy crude oil into 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 crucial for plastic production.
Two main processes are used to produce plastics: polymerisation and polycondensation. Both require specific catalysts. In polymerisation, monomers such as ethylene and propylene are linked together to form long polymer chains. Polycondensation involves two monomers combining to form a dimer by releasing a byproduct. The most common byproduct is water, but byproducts can also be valuable raw materials that are recycled back into the feedstream.
Synthetic plastics are derived from crude oil, natural gas, or coal. Biobased plastics, on the other hand, are made from renewable products such as carbohydrates, starch, vegetable fats and 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 development of newer plastics from renewable resources.
The development of plastics has evolved from the use of naturally plastic materials to the chemical modification of those materials, and finally, to completely synthetic plastics. Early plastics were bio-derived materials such as egg and blood proteins, gums, and shellac. In the nineteenth century, as chemistry developed during the Industrial Revolution, many new materials were discovered. The development of plastics accelerated with Charles Goodyear's 1839 discovery of vulcanization to harden natural rubber.
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Synthetic plastic is made by polymerisation
Synthetic plastic is made by a reaction known as polymerisation, which can be performed in two different ways: addition polymerisation and condensation polymerisation.
Addition polymerisation involves adding together monomers in a long chain. A catalyst is introduced, and one monomer connects to the next, adding one monomer unit at a time. This process is known as chain growth polymers. Some addition polymerisation reactions create no side-products, and the reaction can be performed in the vapour phase. Examples of plastics formed by addition polymerisation include polyethylene, polypropylene, polyvinyl chloride, and polystyrene.
Condensation polymerisation involves combining two or more monomers to form a dimer (two units) by releasing a byproduct. Dimers can then join to form tetramers (four units), and so on. The most common byproduct of this process is water, which is easily treated and disposed of. Other byproducts can be valuable raw materials that can be recycled back into the feedstream. Examples of condensation polymerisation include nylon (polyamide), polyester, and polyurethane.
The production of plastics begins with the distillation of crude oil in an oil refinery, which separates the heavy crude oil into groups of lighter components called fractions. One of these fractions, naphtha, is crucial for plastic production. In a polymerisation reactor, monomers such as ethylene and propylene are linked together to form long polymer chains.
Ethylene is a gaseous hydrocarbon that, when subjected to heat, pressure, and a catalyst, joins together into long, repeating carbon chains. These joined molecules, or polymers, form a plastic resin known as polyethylene (PE). The PE-based plastic is processed in a factory to make plastic pellets, which are melted into a thick liquid and cast into a mould. As the liquid cools, it hardens into a solid plastic product. The processing of the polymer includes the addition of plasticizers, dyes, and flame-retardant chemicals.
Synthetic plastics are derived from crude oil, natural gas, or coal, and they are distinguished from biobased plastics, which are made from renewable sources such as carbohydrates, starch, vegetable fats, and oils. The vast majority of plastic in use today is synthetic due to the ease of manufacturing methods involved in processing crude oil.
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Frequently asked questions
Plastic is a byproduct of polymerisation, which can be performed in two different ways: addition polymerisation and condensation polymerisation.
Addition polymerisation involves adding together monomers in a long chain. One monomer connects to the next with the introduction of a catalyst, in a process known as chain-growth polymers, adding one monomer unit at a time.
Condensation polymerisation involves two monomers combining to form a dimer (two units) by releasing a byproduct.
The most common byproduct is water. Other examples include nylon (polyamide), polyester, and polyurethane.
