‘Dry water’ could be used to store carbon dioxide

Liverpool University researchers believe a substance dubbed ‘dry water’ could be used to absorb and store carbon dioxide.

Other uses for the powdery substance include providing a safer way to store and transport potentially harmful industrial materials.

The researchers reported their findings at the 240th National Meeting of the American Chemical Society.

‘There’s nothing else quite like it,’ said Ben Carter, researcher for study leader Prof Andrew Cooper. ‘Hopefully, we may see dry water making waves in the future.’

Carter said that the substance became known as ‘dry water’ because it consists of 95 per cent water and yet is a dry powder. Each powder particle contains a water droplet surrounded by modified silica. The silica coating prevents the water droplets from combining and turning back into a liquid. The result is a fine powder that can soak up gases, which chemically combine with the water molecules to form a hydrate.

Dry water was discovered in 1968 and received attention for its potential use in cosmetics. Scientists at Hull University rediscovered it in 2006 in order to study its structure and Cooper’s group at Liverpool University has since expanded its range of potential applications.

One of the most recent involves using dry water as a storage material for gases, including carbon dioxide. In laboratory-scale research, Cooper and colleagues found that dry water absorbed over three times as much carbon dioxide as ordinary, uncombined water and silica in the same space of time. This ability to absorb large amounts of carbon-dioxide gas as a hydrate could make it useful in helping to reduce global warming, the scientists suggested.

Cooper and colleagues demonstrated in 2008 that dry water is also useful for storing methane, a component of natural gas, and may help expand its use as a future energy source. In particular, they hope that engineers can use the powder to collect and transport stranded deposits of natural gas. This also exists on the ocean floor in the form of gas hydrates, a form of frozen methane also known as the ‘ice that burns.’ The powder could also provide a safer, more convenient way to store methane fuel for use in vehicles powered by natural gas. ‘A great deal of work remains to be done before we could reach that stage,’ Carter added.

In another potential application, the scientists showed that dry water is a promising means to speed up catalysed reactions between hydrogen gas and maleic acid to produce succinic acid, a feedstock or raw material widely used to make drugs, food ingredients and other consumer products.

Manufacturers usually have to stir these substances together to get them to react. By developing dry water particles that contain maleic acid, Cooper and colleagues showed that they could speed up the acid’s reaction with hydrogen without any stirring, resulting in a greener, more energy-efficient process.

‘If you can remove the need to stir your reactions, then potentially you’re making considerable energy savings,’ Carter said.

Prof Cooper’s team describes an additional application in which dry water technology shows promise for storing liquids, particularly emulsions.

The scientists showed that they could transform a simple emulsion into a dry powder that is similar to dry water. The resulting powder could make it safer and easier for manufacturers to store and transport potentially harmful liquids.

Carter noted that he and his colleagues are seeking commercial or academic collaboration to further develop the dry water technology.

The EPSRC and the Liverpool University’s Centre for Materials Discovery provided funding and technical support for this study.