The chemical industry: what it makes and how it is organised: Key terms, quiz and sources

Understanding Chemicals / Module 1: The chemical industry: what it makes and how it is organised Wrap-up

The chemical industry: what it makes and how it is organised: review

Key terms

Commodity chemical: A high-volume, undifferentiated chemical sold to the same specification by every producer, usually at low and cyclical prices.
Pseudo-commodity: A high-volume product, such as a polyethylene grade, that is differentiated by performance even though it is made at commodity scale.
Fine chemical: A single pure substance made in limited volume in multipurpose plants and sold on specification, often to drug or agrochemical makers.
Specialty chemical: A product or formulation sold on what it does rather than what it is, usually backed by technical service and often branded.
Feedstock: Fuel used as a raw material whose carbon and hydrogen end up inside the product rather than being burned.
High-value chemicals (HVCs): The IEA's term for ethylene, propylene, benzene, toluene and mixed xylenes, often co-produced in steam crackers.
Primary chemicals: The IEA's seven building blocks: ammonia, methanol, ethylene, propylene, benzene, toluene and mixed xylenes.
Building block: A basic chemical, such as ethylene or ammonia, from which large families of other chemicals are made.
Steam cracking: Heating a hydrocarbon such as ethane or naphtha briefly to very high temperature so it breaks into olefins and other products.
Naphtha: A light liquid fraction of crude oil used as cracker feed in Europe and Asia; it gives a balanced mix of olefins and aromatics.
Synthesis gas: A mixture of carbon monoxide and hydrogen made from methane or coal, used to make ammonia and methanol.
Value added: Sales minus the cost of raw materials, fuel, purchased services and other bought-in inputs; the wealth an industry itself creates.
Derived demand: Demand for a product that depends on demand for the goods made from it, as chemicals depend on cars, buildings and food.
Economies of scale: The fall in cost per tonne as plant size rises; for petrochemical plants cost rises roughly with capacity to the power 0.6.
Overcapacity cycle: The pattern in which high margins trigger new plants that arrive together, depress prices and lead to closures.
Active pharmaceutical ingredient (API): The chemical substance in a medicine that has the therapeutic effect, made before formulation into tablets or injections.
Verbund: BASF's term for an integrated site where products flow from one unit to the next, from raw material to finished derivatives.

Try it in the table

Open the Ethylene tile and note which regions and feedstocks it lists. Compare them with the IEA capacity shares in Part 4: is ethane or naphtha the main feed in each region?
Open Sulphuric acid and look at what it says about end uses. Check how the fertiliser share compares with Wittcoff's figure of about 45% for the US in 2000.
Open Ammonia and Methanol side by side. For each, find which feedstock dominates in China and compare it with the IEA's statement that coal is the main feed there.
Open Polyethylene (LDPE, LLDPE) and High-density polyethylene. Count the grades or applications described and decide whether each behaves more like a commodity or a pseudo-commodity.
Open Small-molecule APIs and Custom synthesis (CDMO). Look at where production is concentrated and test Pollak's observation that most small fine chemical firms are now in Asia.
Open Citric acid and Industrial enzymes. Identify the raw material each is made from and where it sits on the value chain between methanol at $0.2 per kilogram and an API at $2,000.

Final quiz

Cefic's headline 'chemicals' sales figure of about EUR 5,031 billion in 2024 excludes which large sector?

Cefic counts pharmaceuticals as a separate industry, so its chemicals totals are smaller than sources such as Wittcoff and Pollak that include drugs.

Between 2015 and 2024, how did EU chemical sales change at constant 2015 prices?

Cefic's volume series shows EU sales of EUR 493.9 billion in 2015 and EUR 469.9 billion in 2024, a fall of about 5%. World volume rose 33% and China's 68%.

Which pair of products are respectively a true commodity and a specialty chemical in Brennan's grid?

Ammonia is high-volume and undifferentiated. A water treatment aid is low-volume and sold for its function. Citric acid and aspirin are fine chemicals; PVC and polyethylene are pseudo-commodities.

In 1999 US pharmaceuticals were 25.7% of chemical shipments. What was their share of value added?

Wittcoff's Table 1.2 gives 32.3%. Basic chemicals show the opposite pattern, 25.5% of shipments but 21.9% of value added.

Which list matches the IEA's seven primary chemicals?

The IEA's list adds ammonia and methanol to the olefins and aromatics. Wittcoff's seven instead include the C4 olefins and methane. Together they give the nine building blocks used in this module.

An ethane cracker yields about 50% more high-value chemicals than a naphtha cracker. What is the main drawback?

The IEA notes that higher overall yield comes at the cost of a narrow product slate. Naphtha gives a balanced mix of ethylene, propylene and aromatics.

Using the 0.6 rule, how much does capital cost per tonne fall when a plant is built ten times larger?

Total cost rises by 10^0.6, about 4 times, while output rises 10 times, so cost per tonne is about 0.4 of the original, a fall of about 60%.

Which development best explains why Saudi Arabia became a major petrochemical exporter?

Wittcoff reports ethane extraction costs of $0.50-0.75 per million Btu in 2001, against US gas at $10 at one point that year. Kent describes SABIC using flared gas and partnering with Western groups to market its output.

Next module: How a chemical process works: reactions, separations, catalysts and flowsheets →

Sources for this module

Cefic (2025), Facts and Figures 2025 data file (European Chemical Industry Council), sheet dumps · sheets 'Sales', 'Sales (Volume)', 'Production', 'Total Exports', 'Total Imports', 'Trade balance', 'Capital Spending', 'R&D Spending', 'Employment', 'Extra-EU27 Exports', 'Extra-EU27 Imports', 'Energy consumption'
Kent, J.A. (ed.) (2012), Handbook of Industrial Chemistry and Biotechnology, 12th ed., Springer. Ch 1 (Aftalion), Recent History of the Chemical Industry 1973 to the Millennium · pdf pp. 16-60
Kent (2012), Ch 22 Synthetic Nitrogen Products; Ch 23 Phosphorus and Phosphates; Ch 25 Sulfur and Sulfuric Acid; Ch 26 Salt, Chlor-Alkali, and Related Heavy Chemicals; Ch 27 Industrial Gases; Ch 30 Industrial Biotechnology · pdf pp. 910, 945, 1001-1002, 1021-1022, 1043, 1132-1133
Wittcoff, H.A., Reuben, B.G. and Plotkin, J.S. (2004), Industrial Organic Chemicals, 2nd ed., Wiley. Ch 0, Ch 1 The Chemical Industry, Ch 2 Chemicals from Natural Gas and Petroleum · pdf pp. 28-29, 41-79, 83-87
Brennan, D. (2020), Process Industry Economics, 2nd ed., Elsevier. Ch 2 Market evaluation and forecasting · pdf pp. 26-29, 34
Pollak, P. (2011), Fine Chemicals: The Industry and the Business, 2nd ed., Wiley. Chs 1, 2 and 9 · pdf pp. 25-35, 116-118
IEA (2018), The Future of Petrochemicals: Towards more sustainable plastics and fertilisers, OECD/IEA · pdf pp. 11-14, 17, 24-25, 27-38
Murmann, J.P. (2003), Knowledge and Competitive Advantage: The Coevolution of Firms, Technology, and National Institutions, Cambridge University Press. Ch 1 · pdf pp. 16, 51