Bromine Plant

We have taken a trip around the extant exteriors of the processing plant.

Now let’s turn our attention toward the epic infrastructure which extracted and pumped seawater.

Sea water is sucked in and then lifted 50ft into sea water ponds by huge pumps where any debris is removed. It is then passed to the seawater main where chlorine and dilute sulphuric acid are added which releases the bromine. It is literally blown out of the water. This water is passed into the top of a tower where it drops over 20ft through the packed section of the tower. There it is met by currents of air travelling upwards. Where it meets these air currents the bromine gets stripped out the water, which is returned to the sea. Whilst the wet bromine laden air passes from the top of the tower to be treated with sulphur dioxide and water. This produces mists of hydrobromic and sulphuric acids.

This mist passes into an absorber, and the acid coalesces. From here, it blows to a collecting tank. The bromine free air returns to the blowing out tower and the cycle begins again. The acidic product is referred to as primary acid liquor. This is now pumped to the steaming out tower. It enters the top and is treated with chlorine and steam, which releases the bromine as vapour. It is then condensed to a liquid. The bulk of bromine goes to dibromoethane, whilst the remainder is sold or used to make other intermediates.

It takes about 22,000 tonnes of seawater to produce 1 tonne of bromine. Every minute 300,000 gallons of seawater are drawn in.

This now redundant technology has left a legacy of industrial dereliction amongst the ancient Pre-Cambrian rocks and sylvan seas of the Anglesey Coast.

This is a landscape which induces fear and fascination in equal measure.

Whatever is fitted in any sort to excite the ideas of pain, and danger, that is to say, whatever is in any sort terrible, or is conversant about terrible objects, or operates in a manner analogous to terror, is a source of the sublime; that is, it is productive of the strongest emotion which the mind is capable of feeling.

Edmund Burke

Amlwch has been the centre of the world’s copper industry, a coastal town on Anglesey with a long history of trade, the coming and going of goods.

Once the site of a processing plant extracting bromine from sea water.

The Associated Octel factory was built to extract bromine from seawater and turn it into an additive for petrol engines. At the time, petrol used in road vehicles contained lead. Engine knocking was a common problem, when the mixture of air and fuel didn’t burn efficiently with each detonation. This could damage engine cylinders over time. The additive produced here reduced knocking and improved engine efficiency.

As the health effects of lead in vehicle exhaust gases became better understood, unleaded petrol was developed. It was introduced to UK filling stations in the 1980s, and leaded petrol was later phased out. As demand for anti-knock additive reduced, the Octel factory diversified into other bromine products and was taken over by Great Lakes Chemical Corporation. In 2003, the corporation decided to close the works with the loss of more than 100 jobs.