The "King of Chemicals" Is Vanishing: How the Iran War Triggered a Global Sulfuric Acid Crisis
You've probably never thought about sulfuric acid. Not once. And honestly, why would you?
It's not exactly dinner-table conversation. It doesn't have the drama of oil prices or the urgency of semiconductor shortages that make headlines every few months.
But here's the thing that should keep you up at night: sulfuric acid is the most manufactured chemical on planet Earth , we produce roughly 300 million tonnes of it every year, and right now, thanks to the Iran war, it's suddenly vanishing from global markets.
What happens when the world runs short of the chemical that makes fertilizer for our food, extracts the copper for our electronics, and processes the nickel for our electric car batteries?
Let's just say you're about to start thinking about sulfuric acid.
What Is Sulfuric Acid and Why Is It Called the "King of Chemicals"?
Before we dive into the crisis, let's get oriented, because sulfuric acid deserves a proper introduction.
Sulfuric acid (H₂SO₄) is a colorless, corrosive liquid. Sounds boring, right? But think of it as the Swiss Army knife of industrial chemistry. It's not the final product you buy; it's the invisible tool that makes almost everything else possible.
Roughly 60% of all sulfuric acid goes into producing phosphate fertilizers, the kind that keeps global crop yields high enough to feed 8 billion people. Without it, phosphate rock stays locked up in the ground, and fertilizer factories grind to a halt.
But it doesn't stop there. Sulfuric acid is the workhorse behind:
- Copper mining: Extracting copper from low-grade ore requires massive amounts of acid, roughly 1.5 to 3 tonnes of sulfuric acid for every single tonne of copper produced
- Nickel processing: The high-pressure acid leach (HPAL) plants that produce battery-grade nickel run on sulfuric acid
- Petroleum refining: Removing impurities from crude oil
- Steel pickling: Cleaning metal surfaces before manufacturing
- Water treatment: Adjusting pH levels in municipal systems
As the US Geological Survey puts it, sulfuric acid is "one of the most important raw materials underpinning global industrial and fertiliser production". And until recently, it was something the world took completely for granted.
(Side note: sulfuric acid is also ridiculously dangerous in its concentrated form, it'll burn through skin like butter. But handled properly in industrial settings, it's as routine as flour in a bakery. That juxtaposition of danger and mundanity is part of what makes this story so surreal.)
The Fertilizer Connection
Here's the chain reaction, simplified: no sulfuric acid → no phosphate fertilizer → lower crop yields → higher food prices.
About half of global sulfur use goes directly into fertilizer production. When acid supplies tighten, fertilizer plants either pay through the roof or cut output. When they cut output, farmers apply less fertilizer. When farmers apply less fertilizer, harvests shrink. And when harvests shrink? Your grocery bill goes up.
Fertilizer already accounts for up to 25% of agricultural production costs in many regions. Stack rising acid costs on top of that, and the math gets ugly fast.
The Metal Connection
If you own a smartphone, drive a car, or live in a house with electrical wiring, you depend on copper. A lot of that copper, around 16% of global supply, is extracted using a process called solvent extraction and electrowinning (SX-EW), which essentially dissolves copper out of crushed rock using, you guessed it, sulfuric acid.
Countries like the Democratic Republic of Congo, the world's second-largest copper producer, rely on this method for roughly 70% of their copper output. And about 90% of the sulfur they need comes from the Middle East.
Which brings us to the problem.
How the Iran War Broke the Sulfur Supply Chain
In February 2026, the simmering conflict between the US/Israel and Iran exploded into open warfare. Israeli airstrikes targeted Iranian nuclear facilities. Iran retaliated by effectively shutting down the Strait of Hormuz, the narrow waterway through which roughly one-third of global oil trade passes.
But something else transits the Strait of Hormuz in staggering volumes: sulfur.
Before the war, the Persian Gulf accounted for more than half of all global seaborne sulfur exports. The Gulf states, Saudi Arabia, the UAE, Qatar, Kuwait, and others, produce vast quantities of sulfur as a byproduct of oil and gas refining. For decades, that sulfur flowed cheaply and reliably to fertilizer plants and acid producers worldwide.
Then the missiles started flying.
The Strait of Hormuz: A 21-Mile Chokepoint
The Strait of Hormuz is just 21 miles wide at its narrowest point, barely the width of a large city. Yet through this sliver of water passes approximately 53% of the world's seaborne sulfur loadings in a normal year.
Since the closure in late February 2026, that flow has been decimated. Global sulfur loadings collapsed to an estimated 1.5 million tonnes in March 2026 , a drop of 45.7% compared to the same month in 2025.
Gulf region exports were hit even harder. March 2026 saw regional export volumes fall to around 400,000 tonnes across all routes , a staggering 74.5% year-on-year contraction. Shipping analysts described it as "unprecedented."
And here's where it gets worse.
You can't just substitute sulfur. The low-cost, high-volume supply from the Middle East was unique. Other regions, like North America, produce sulfur, but their oil and gas is "sweeter" (lower sulfur content), meaning less byproduct sulfur is generated. Russia was a major exporter until sanctions removed its volumes. The net result is a structural deficit that can't be patched with a few extra shipments from elsewhere.
Sulfur prices have surged by over 200% since the crisis began. Acid prices followed suit. China's domestic sulfuric acid price hit 1,300 yuan per tonne in March 2026, up from an average of 295 yuan per tonne in 2024, that's a more than fourfold increase in two years.
China's Export Ban: The Second Shock
Just when the global market thought things couldn't get tighter, Beijing dropped a bombshell.
In early April 2026, reports emerged that China, the world's largest sulfuric acid exporter, responsible for around 15% of global seaborne supply , would halt all sulfuric acid exports starting in May. No official announcement was made, but smelters confirmed they were preparing to implement the measure.
The logic was straightforward: China is the world's largest agricultural producer, and spring planting season requires enormous volumes of fertilizer. With sulfur imports disrupted by the Hormuz closure, Beijing decided to hoard its domestic acid supply to protect food security. As ING's chief economist for Greater China explained, "the contribution of sulphuric acid exports to GDP was far less important than the broader goal of safeguarding food security".
The global impact was immediate and brutal. China had exported 4.65 million tonnes of sulfuric acid in 2025, with major destinations including Chile, Indonesia, India, Morocco, and Saudi Arabia. Analysts at CRU estimated that India, South Korea, and Japan could collectively increase exports by just 500,000 tonnes to compensate, a drop in the bucket compared to China's missing 2.8 million tonnes.
"The loss of Chinese volumes will be difficult to offset, given the parallel shortage of sulfur feedstocks," warned CRU acid analyst Peter Harrisson.
(Let that sink in: the world's biggest exporter just walked away from the market, and literally nobody else can fill the hole. It's like the only gas station in a 200-mile radius closing during a fuel crisis.)
What This Means for You
At this point, you might be thinking: "Fascinating. A chemical shortage. But I'm not a copper smelter or a fertilizer executive. Why should I care?"
Fair question. Let's connect the dots.
Your Grocery Bill Is About to Get Ugly
The FAO's chief economist has issued stark warnings about the ripple effects of sulfur disruption on global food security. Fertilizer prices were already elevated before the war. Now, with sulfur supplies choked and Chinese acid exports halted, phosphate fertilizer costs are spiking again.
Global fertilizer prices rose approximately 15% in 2025 due to pre-existing supply constraints. In 2026, that trajectory has steepened dramatically. Middle East urea prices jumped 19% in a single week following the Strait of Hormuz closure.
Here's the timeline you should understand: fertilizer price spikes today → higher farming costs this planting season → reduced yields at harvest → food price inflation 6–18 months later. The lag effect means most consumers haven't felt the full impact yet, but it's coming.
The Energy Transition Just Hit a Wall
This is the part nobody's talking about.
The global transition to clean energy, electric vehicles, solar panels, grid infrastructure, is a metals-intensive project. A single EV requires roughly 2.5 times more copper than a conventional car. Solar farms need copper for wiring. Wind turbines need copper for generators.
All of that copper requires sulfuric acid.
Chile, the world's largest copper producer, is structurally short of sulfuric acid and historically imported over a million tonnes annually from China. Those imports have stopped. Spot prices for acid in Chile have doubled, and smaller mining operations face "growing exposure" to potential shutdowns.
Then there's nickel. Indonesia, the world's largest nickel producer and a critical supplier for EV batteries, sources roughly 75% of its sulfur from the Middle East. Macquarie estimates that sulfur price increases have already added $4,000 per tonne to Indonesian nickel production costs.
And here's the kicker: nearly 70% of global silver production comes as a byproduct of copper mining. When copper production slows due to acid shortages, silver supply tightens too, which directly impacts solar panel manufacturing, since silver is a critical component in photovoltaic cells.
So to summarize: the Iran war is simultaneously making the energy transition more expensive and slowing down the production of the very metals we need to make it happen. It's a grim paradox.
Are There Any Solutions?
Not fast ones. But the crisis is forcing innovation.
Sulfuric Acid Regeneration (SAR) , essentially recycling spent acid, is gaining attention. But these plants take two to three years to build and require significant capital investment. Until recently, cheap Middle Eastern sulfur made SAR economically unattractive. That calculus has changed overnight.
Alternative acids like methane sulfonic acid (MSA) are being explored. MSA is biodegradable, non-toxic, and can substitute for sulfuric acid in certain applications. But at a market size of just $776 million compared to sulfuric acid's $25–27 billion, it's not remotely capable of filling the gap.
New sulfur-burning capacity is being developed in Morocco, India, and Indonesia, but these projects were planned before the crisis and won't come online quickly enough to address the immediate shortage.
Pyrite-based acid production , extracting sulfur from iron pyrite (fool's gold), is being reconsidered after decades of being sidelined by cheap Middle Eastern supply. Australia's SMAC Developments is advancing plans for a pyrite-processing acid plant in North Queensland, with the company's managing director arguing that "substitute supply needs to be developed sooner rather than later".
The honest, uncomfortable answer is that there is no near-term fix of equivalent scale. The world built a chemical supply chain that assumed permanent, cheap access to Middle Eastern sulfur. That assumption no longer holds.
The Invisible Crisis No One's Talking About
The Iran war's impact on oil markets has dominated headlines. But oil has alternatives, strategic reserves, OPEC production adjustments, demand management. Sulfuric acid doesn't.
The world is now facing a dual supply shock: the physical blockage of sulfur shipments through the Strait of Hormuz, compounded by China's strategic retreat from acid export markets to protect its own food security. Together, they've created a deficit that analysts warn could persist throughout 2026 and beyond.
What makes this crisis particularly dangerous is its invisibility. Most people have never heard of sulfuric acid, let alone understand how deeply their lives depend on it. But the ripple effects, higher food prices, slower EV adoption, more expensive electronics, will be felt by everyone.
The "King of Chemicals" is in short supply. And it turns out that when the king stumbles, the entire kingdom shakes.
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