The sulfuric-acid market is booming and oil companies are reaping the rewards.

According to the London Times, the price of sulfur has risen from $50 to $500 a ton in under a year. More from this report:

“Shell is one of the most-efficient producers of sulphur,” Barry Clarke, a sulphur market analyst for Pentasul, said. Shell produces about 3.5 million tonnes of sulphur, much of it from its Canadian oil sands business, and its cost, Mr Clarke reckons, is merely the rail freight cost of getting the sulphur to a port, about $25 a tonne.

Mr Clarke agrees that sulphur, once a burden, could earn the oil industry billions this year. “It’s going to show up in the earnings of companies,” he said. The price is expected to rise further with spot cargoes changing hands for as much as $700 a tonne. Demand for metals is also keeping sulphur bubbling, as sulphuric acid is used in the mining industry to leech metal from ore.

“The biofuel boom has kicked off a big increase in the demand for sulfuric acid,” says Chris Mayer in The Daily Reckoning.

“In fact, some 60% of the sulfuric acid ends up in agriculture. The surge in ethanol production is a double whammy on sulfuric acid. First, all that corn needs fertilizers. And second, the ethanol facilities themselves also use sulfuric acid in their own processing. A typical ethanol facility requires 2,000-4,000 tons of sulfuric acid per year.

“Then there is that great demand pull from China and India. Traditionally, these two countries produced what they needed. But now their own rapid industrialization has turned the tables. They’ve switched from being exporters to importers of sulfuric acid.”

Read on to find the only “pure play” on sulfuric acid spot prices — a little-known company that’s one of the world’s largest suppliers of sulfuric acid.