Same Owner, Same Catalyst, Twelve Times the Gas: Why Europe's Last Acetic Acid Plants Went Dark

On Tuesday 22 September 2026, Ineos said two of the three acetyls plants on its Saltend site in Hull had already stopped and the third would follow within days. The units are to be “mothballed until further notice.” They are, in the company’s words, “the last remaining acetyls units in Europe,” and the company’s chairman gave a single reason: “I’m sure people will find it hard to believe that we are being forced to mothball some of the most efficient plants in Europe but with gas prices now 12 times the level in the US and 8 times that of China, we just cannot compete.”

If you buy ethyl acetate or glacial acetic acid, the obvious question is what a shutdown in England has to do with a drum in Texas or Ohio. The useful answer is not a price forecast. It is the recipe. Acetic acid and ethyl acetate made the way Hull makes them are two of the most gas-intensive molecules on a solvent shelf, and the arithmetic shows exactly how much of each drum began as gas. That arithmetic explains this week’s decision, and it tells you which part of the market to keep an eye on.

This is a market-structure piece. It takes no view on energy policy on either side of the Atlantic. It is not advice to buy or sell on any schedule. Every figure comes from the company’s own statements, a trade publication or a published technical source, all listed at the end.

What happened, in order

The shutdown makes more sense against the site’s history. Saltend has made acetic acid for almost a century, and every major process change in that time was about making the molecule from cheaper carbon with less waste. The last change it could not make was the price of the gas.

Two points stand out in the table. First, the site had already done the obvious efficiency work: the switch to hydrogen fuel was only a year old. Second, the plant stayed in the company. The same owner, holding the same licence, bought a larger plant on the Texas Gulf Coast three years ago and said at the time why it wanted that location. The trade press reports Ineos is keeping about 250 direct staff on the Hull site, and Chemistry World stresses that the plants are idled, not demolished, and could restart if the gas price or the fuel source changes.

Two reactions that keep every atom

Acetic acid and ethyl acetate share a production chain, and both steps are additions: two molecules go in, one comes out, and nothing is thrown away. That makes the arithmetic unusually clean, and it is the reason gas matters so much.

Step one: acetic acid by methanol carbonylation. Methanol and carbon monoxide are passed over a dissolved metal catalyst with an iodide promoter, and the carbon monoxide inserts into the methanol’s carbon–oxygen bond:

The older Monsanto process does the same reaction with rhodium. BP’s iridium system, Cativa, was developed to run with less water in the reactor, which means fewer drying columns and fewer by-products. The two systems are similar enough to share equipment, which is how Saltend’s A4 plant was converted in place in 1998 rather than rebuilt.

Step two: ethyl acetate by direct addition. Most of the world’s ethyl acetate is made by the textbook route, esterifying ethanol with acetic acid and removing the water that forms. Hull’s AVADA process (“AdVanced Acetates by Direct Addition”) skips the ethanol. It adds acetic acid straight across the double bond of ethylene, in the gas phase, over silica beads impregnated with a silicotungstic heteropoly acid:

The same study credits the route with about 20% lower energy use and 35% lower feedstock losses than a conventional esterification unit, and no stream of reaction water to treat. It was, and is, a very good way to make ethyl acetate. It is also a route with no step that does not begin with gas or a cracker.

The gas arithmetic

This is the part worth keeping. Because both reactions keep every atom, the molar masses give the feedstock bill directly, with no yield assumptions beyond perfect conversion. Real plants lose a few percent, which shifts the numbers slightly but not the argument.

One tonne of acetic acid needs 32.04 ÷ 60.05 = 0.534 tonnes of methanol and 28.01 ÷ 60.05 = 0.466 tonnes of carbon monoxide. One tonne of ethyl acetate needs 60.05 ÷ 88.11 = 0.682 tonnes of acetic acid and 28.05 ÷ 88.11 = 0.318 tonnes of ethylene. Multiply through and the whole chain collapses into one line:

Where those inputs come from is the whole story. Methanol and carbon monoxide are both made from synthesis gas, a mix of carbon monoxide and hydrogen, which in Europe and North America is made from natural gas and in China largely from coal. Ethylene comes from a steam cracker and reaches Saltend by the UK ethylene pipeline.

So a tonne of ethyl acetate made the Hull way is about 364 grams of methanol, 318 grams of carbon monoxide and 318 grams of ethylene in every kilogram, and nothing else. Roughly two-thirds of its mass arrived as synthesis-gas chemistry. On top of that feedstock, the site burns fuel to run the reformer and to heat the distillation columns that purify both products. Gas enters the plant twice, as feedstock and as fuel, and the 2025 switch to hydrogen fuel could address only the second.

That is why Ineos quoted a gas ratio rather than a labour cost, a tax or a demand figure. When the input is mostly gas and the reaction wastes nothing, there is no process improvement left to absorb a gas price twelve times higher than a competitor’s. The only remaining lever is location, and Ineos had already used it once, in Texas City.

The China comparison works a little differently. Ineos put European gas at eight times the cost of “coal-based” Chinese production, and that wording matters. Much Chinese methanol and carbon monoxide comes from gasifying coal rather than reforming gas. The chemistry downstream of the synthesis gas is identical; the carbon just enters the chain as coal instead of methane. On a certificate of analysis, the molecule is the same whichever feedstock it started from.

Where the missing European tonnes come from

Ineos was plain about the replacement: in its statement, European customers who relied on Hull will now be supplied from the United States and from China. Chemistry World adds that as plants in a chemical cluster close, the ones left lose “efficient interconnections” and shared services get proportionally more expensive. One closure can make the next one more likely.

For a US buyer, the useful lesson is structural, and it is not a price call. Acetic acid and ethyl acetate are now traded goods in Europe, not locally made ones. A continent that used to balance its own acetyls now draws on the same North American and Asian capacity that serves everyone else. Nobody can say from outside how much extra export pull that creates, or when. What can be said is which inputs to watch, because the arithmetic above names them.

What to actually watch

Methanol, first. It is the largest single input by mass in both products, a little over half of every tonne of acetic acid. Methanol has its own story this year, covered in our September piece on the methanol squeeze. Any move in methanol reaches acetic acid through that 534-kilogram ratio, whichever continent the plant is on.

The gas spread, second. The Hull decision is the transatlantic gas spread turned into a plant closure. The company’s own statements say the units are idled, not dismantled, and could restart if the fuel economics change. A narrowing spread is the signal that would bring those 500,000 tonnes of acetic acid back to Europe. A widening one would put pressure on the next European plant that makes something out of synthesis gas.

Ethylene, third, and only for ethyl acetate. Direct addition ties ethyl acetate to the cracker. Esterification ties it to ethanol instead. Most of the world’s ethyl acetate is made from ethanol, so for most drums the second input is fermentation ethanol, not cracker ethylene. Hull was the exception, and its exit leaves more of the market on the ethanol route.

None of these is a reason to buy ahead of need. They are the three lines to read when a supplier explains a price change “because of Europe.”

What this means on a specification

None of this changes which grade you need. The molecule is defined by its formula, not by the continent or the route. What changes, when supply shifts between producers, is which certificate lines are worth a second look.

Two practical points follow, one for each product.

Glacial acetic acid freezes at about 16.6 °C (62 °F). That is where the word “glacial” comes from: the pure acid freezes into ice-like crystals in a cold room. As autumn arrives, drums in unheated warehouses and trailers start to solidify. That is normal and reversible; warm the container gently and the acid melts back unchanged. It also gives a crude check on purity. Water lowers the freezing point, so a lot sold as glacial that never freezes in a cold building is worth a look at the water line on its certificate.

Ethyl acetate is a Class 3 flammable liquid with a flash point well below room temperature. Order the pack size you can use and store properly, not the one that looks cheapest per gallon. A half-used drum pulls in moist air every time it is opened, and moisture is what drives the acidity drift described above.

A word on what this article does not say. It describes how acetic acid and ethyl acetate are made at Saltend and in Texas City, what the company that owns both sites said about why one stopped, and where the inputs to that chemistry come from. It makes no claim about ours: where the ethyl acetate or acetic acid we list is manufactured, by which route, or how our own inventory position is affected by this week’s decision. Nobody writing this has verified any of that, and a market-structure article is the wrong place to guess.

Common questions

Why did Ineos shut down the Hull acetyls plants?

Energy cost. Ineos said European gas prices are 12 times the US level and 8 times the cost of coal-based Chinese production. At Hull, gas is both the fuel and the source of the synthesis gas behind the acetic acid feedstocks. The site had already switched its fuel to hydrogen in 2025, cutting gas use by about a third, and still could not compete.

Is the Hull acetyls shutdown permanent?

No, not as announced. Ineos said the three units will be mothballed until further notice, not demolished, and trade press reports that about 250 direct staff remain on site. Chemistry World notes the plants could restart if gas prices fall or cheaper fuel is secured. Until then, European demand is being supplied from the United States and China.

What is ethyl acetate made from?

Usually ethanol and acetic acid, by esterification, which is the route behind most of the world’s supply. Hull used a different route, BP’s AVADA process, which adds acetic acid directly to ethylene over a heteropoly acid catalyst. Both routes give the same molecule, CH₃COOC₂H₅, CAS 141-78-6. Only the second input differs: fermentation ethanol in one case, cracker ethylene in the other.

Why does the price of natural gas matter so much to acetic acid?

Because acetic acid is methanol plus carbon monoxide, and both are made from synthesis gas. Outside China, synthesis gas is made mostly from natural gas. A tonne of acetic acid needs about 534 kilograms of methanol and 466 kilograms of carbon monoxide, and the reaction wastes no atoms. Nearly the whole feedstock bill, plus the fuel to run the plant, therefore traces back to gas.

Does this change which grade of ethyl acetate or acetic acid I should buy?

No. The molecule and the grade specifications are the same whatever the route or the country of manufacture. What is worth doing when supply is shifting between producers is to check the certificate lines that vary lot to lot. For ethyl acetate that means water and acidity. For glacial acetic acid it means water and residue.

Why does glacial acetic acid freeze in a cold warehouse?

Pure acetic acid freezes at about 16.6 °C, or 62 °F, well above the temperature of an unheated building in autumn and winter. That is what “glacial” refers to. Freezing is harmless and reversible: warm the container gently and it melts back unchanged. Water lowers the freezing point, so a glacial lot that never solidifies in the cold may be wetter than its label suggests.

The ethyl acetate and acetic acid we stock

Ethyl Acetate Technical Grade

The workhorse solvent for coatings, inks, adhesives and leather finishing. Quart to 55-gallon drum; keep it dry.

Ethyl Acetate ACS

Reagent grade for extraction, chromatography and lab work, where residue and alcohol content are specified, not just assay.

Acetic Acid Glacial Technical

99%-plus acetic acid for synthesis and pH control, quart to 330-gallon tote. Also as ACS reagent grade.