· 8 min read
Fossil fuels don’t just power our cars or light our homes—they shape the material world. From the fertilizers that feed billions to the plastics in our phones, food, and hospitals, petrochemicals are the invisible architecture of modern life. They’ve lifted living standards, enabled globalization, and even extended life expectancy.
But as we race toward net zero, this quiet industrial engine becomes a glaring dilemma. The chemical and petrochemical sector is the largest industrial energy consumer—and a fast-growing emitter. Its climate impact is not just a by-product—it’s baked into the products themselves.
We must now ask: Can we keep the benefits of petrochemicals without the carbon burden? The answer will depend not just on incremental change—but on a radical reimagining of chemistry, energy, and materials.
Petrochemicals: The hidden engine of modern society
Petrochemicals are present in nearly every aspect of life. They form the building blocks of:
• Plastics: for packaging, electronics, and construction
• Nitrogen fertilizers: essential for global food systems
• Synthetic fibers: in clothing, insulation, and hygiene products
• Solvents, additives, and dyes: in manufacturing, healthcare, and consumer goods
In 2013, the global chemical sector consumed over 513 million tonnes of fossil fuel feedstocks, producing 820 million tonnes of final chemical products, according to a detailed global mass flow analysis by the Energy Transitions Commission (ETC, 2023).
A powerful Sankey diagram from the study visualizes how fossil carbon flows through the sector. It traces the transformation of inputs like natural gas liquids (NGLs), coal, and oil products into a wide array of end products.
Three major categories dominate:
• Thermoplastics: 222 Mt
• Nitrogenous fertilizers: 274 Mt
• Solvents, additives, and rubbers: 107 Mt
These three alone account for more than 70% of total output. And unlike energy combustion—which emits carbon once—these products store carbon in the material economy, only to be released later through degradation, incineration, or landfill breakdown.
This visual flow reveals what industry often obscures: carbon is not just fuel—it’s material. The entire petrochemical chain is a long-duration carbon management system. And today, that system is overwhelmingly linear and fossil-dependent.
Where emissions come from: Not just smoke stacks, but molecules
Petrochemical emissions occur at multiple stages of the product lifecycle:
1. Feedstock emissions: Fossil carbon remains physically embedded in the materials produced.
2. Process emissions: High-temperature transformations like steam cracking and syngas production require intense energy, often from fossil fuels.
3. End-of-life emissions: As plastics degrade or are incinerated, and as fertilizers emit nitrous oxide, long-term emissions are released back into the atmosphere.
One emissions hotspot is syngas, a mixture of hydrogen, carbon monoxide, and CO₂ used to produce ammonia and methanol. The dominant production method—steam methane reforming (SMR)—emits 9–12 tonnes of CO₂ per tonne of hydrogen produced (IEA, 2019).
Similarly, ethylene—the world’s most produced organic chemical—accounts for 260 Mt CO₂ annually, primarily through energy-intensive naphtha steam cracking (IEA, 2020).
Crude-to-chemicals: A pivot, not a panacea
Facing fuel decarbonization and electric vehicle growth, oil refiners are shifting toward crude-to-chemicals (C2C) pathways. Instead of maximizing gasoline, refineries now reconfigure assets to produce higher-value petrochemical outputs.
A key technology is the Fluid Catalytic Cracker (FCC). In high-severity mode, it can yield:
• 24% ethylene
• 33% propylene
• 14% aromatics (BTX)
…from each barrel of vacuum gas oil (McKinsey, 2020).
However, higher chemical yields do not equate to lower emissions unless paired with green hydrogen, carbon capture, or process electrification. Otherwise, this becomes a redirection—not a reduction—of fossil carbon.
Three levers for decarbonization
The sector’s emissions can be addressed through a trio of complementary strategies:
1. Feedstock and fuel substitution
Radical innovation is beginning to unlock alternatives to fossil feedstocks:
• Biomass-based chemicals: Using sugars, lignocellulosic materials, or algae for bio-derived polymers.
• CO₂-to-polymer: Electrochemical or catalytic routes convert captured carbon into polycarbonates or polyurethanes.
• Algae-based monomers: Promising lab-scale trials have yielded precursors for bio-acrylics and polyesters.
• Chemical recycling: Pyrolysis and enzymatic depolymerization recover monomers for reuse—closing the loop.
Yet these remain early-stage. Bio-based routes face scalability and land-use trade-offs. CO₂ conversion requires abundant low-cost, renewable electricity to compete commercially.
2. Process innovation and electrification
• AI-designed catalysts: Machine learning accelerates catalyst discovery and reaction optimization—cutting R&D timelines dramatically.
• Enzymatic chemistry: Biocatalysts offer lower-temperature, lower-pressure synthesis with fewer emissions.
• Electric cracking: Replacing fossil combustion with renewable-powered resistive or inductive heating.
The IEA estimates that 15–25% process energy savings are possible through these upgrades (IEA, 2021).
3. Carbon Capture and Storage (CCS)
Where fossil inputs remain unavoidable, CCS offers a bridging solution:
• Process CCS can achieve 95% CO₂ capture efficiency in syngas and ammonia production (IEAGHG, 2020).
• Autothermal Reforming (ATR) and Gas-Heated Reforming (GHR) integrate capture-ready processes while improving hydrogen yields.
But without stringent policy and lifecycle tracking, CCS risks becoming a license for continued fossil lock-in.
Should petrochemicals survive the Net-Zero transition?
This is no longer just a technical question—it’s a strategic one.
The Case Against Continued Fossil Inputs:
• Lock in Scope 3 emissions across the value chain
• Delay true innovation by leaning on CCS as a crutch
• Maintain linear consumption models that are unsustainable
• Rely on business models that are structurally misaligned with climate action
The Case for a Managed, Transitional Role:
• Essential sectors like food, medicine, and sanitation still rely on petrochemicals
• Fossil carbon, if captured and embedded in durable, circular products, may serve as a transitional material
• Radical breakthroughs in CO₂ chemistry, green hydrogen, and circular design are not yet mature at scale
What matters is not simply “should we stop using fossil feedstocks?” but rather “under what strict conditions can their use be temporarily justified?”
Redefining compatibility with Net-Zero
For petrochemicals to align with net-zero, the following must become non-negotiable:
• Full life-cycle carbon accounting, including Scope 1–3 and embedded emissions
• Mandatory CCS or electrification for new plants post-2030
• Phasedown of virgin fossil feedstocks by mid-century
• Public R&D investment in green chemistry, AI-driven process innovation, and non-fossil material platforms
• Circular economy mandates across major consumer sectors (packaging, textiles, vehicles)
We must transition from extract–process–dispose to capture–create–recycle.
Final reflection: Petrochemicals as a test of our imagination
Petrochemicals lifted modern life—but now test the limits of planetary health.
They are not just a carbon challenge—they are a systems challenge. What replaces them won’t be one molecule or one miracle technology. It will be a web of green hydrogen, AI-accelerated chemistry, algae monomers, electrified crackers, and closed-loop materials.
This is no longer a debate about emissions. It’s a question of economic imagination:
Can we redesign the industrial metabolism of the planet?
As the Sankey diagram shows, the patterns of production are well understood.
Now, we must radically reshape them.
illuminem is proud to partner with Africa Sustainable Energy Center (ASEC) to amplify the voices leading Africa’s transition to clean, sustainable and affordable energy. illuminem Voices is a democratic space presenting the thoughts and opinions of leading Sustainability & Energy writers, their opinions do not necessarily represent those of illuminem.
Sources:
1. IEA, The Future of Petrochemicals (2018): https://www.iea.org/reports/the-future-of-petrochemicals
2. IEA, The Future of Hydrogen (2019): https://www.iea.org/reports/the-future-of-hydrogen
3. IEA, Technology Roadmap: Low-Carbon Transition in the Chemical Industry (2020): https://www.iea.org/reports/technology-roadmap-low-carbon-transition-in-the-chemical-industry
4. McKinsey & Co, The Future of Petrochemicals (2020): https://www.mckinsey.com/industries/oil-and-gas/our-insights/the-future-of-petrochemicals
5. IEAGHG, Ammonia Production with CO₂ Capture (2020): https://ieaghg.org/docs/General_Docs/Reports/2020-05.pdf
6. FAO, State of the World’s Land and Water Resources for Food and Agriculture (2021): https://www.fao.org/3/cb7491en/cb7491en.pdf
7. Energy Transitions Commission, Chemical Products and Materials: The Challenge of Decarbonisation (2023): https://www.energy-transitions.org/publications/chemical-products/
