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'Green' Aerosol Propellants Whilst the hydrocarbons in current use do work extremely well in the ’bag type’ dispensation cans, it is generally accepted that they have several drawbacks. The hydrocarbons are examples of volatile organic compounds (VOCs), which are categorised as potential global warmers under the Kyoto Agreement. The aliphatic hydrocarbon compounds, in addition to being geopolitically sensitive, are also highly flammable, toxic, and recycling opportunities are problematic owing to flammable residues. The novel gas adsorption system utilises the inherent properties of an activated carbon adsorbent and its general propensity for gas storage; whereby under pressurised conditions the extensively developed carbon porosity provides for greatly enhanced volume storage of either a pure gas, such as carbon dioxide or nitrogen, or a gas mixture such as air. There are several distinct advantages to the use of carbon dioxide in the alternative gas adsorption system. CO2 gas is non-flammable, essentially non-toxic and does not fall within the definition of a VOC. The gas is derived from either natural source, or as a by-product of several manufacturing processes: particularly combustion plant or fermentation. The gas is ubiquitously available at relatively low cost. The developed adsorption application actually sequestrate volumes of CO2 from the environment. Consequently, it can be argued that it provides a positive contribution to the reduction in greenhouse gasses and global warming. In particular, the developed Chemviron gas adsorption system has been demonstrated to work very effectively for ’bag-in-can’ dispensation e.g. shave-gel. A specially selected granular activated carbon with adsorbed carbon dioxide provided a sufficient gas volume to maintain a satisfactory, even, controlled flow of gel dispensation to completion: generally indistinguishable from a corresponding hydrocarbon system. Similar gel dispensation trials using just pressurized carbon dioxide gas with no activated carbon component was proved to be unsatisfactory with relatively uneven gel flow. Development studies continue at Chemviron Carbon, in particular evaluation and consideration of additional applications for the novel gas adsorption system (larger scale or niche). In addition, the adsorption properties of other gases under pressurized conditions, such as oxygen and natural gas, are being determined. Chemviron Carbon would be pleased to collaborate with other interested partners to identify, develop and promote viable commercial opportunities that would utilise adsorption technologies. To discuss this or other possible applications in more detail please contact: David Reay or Dr. Tony Ryan on (01942) 275 400. Chemviron Carbon, Edgar House, Lockett Rd., Ashton-in-Makerfield, Lancashire, WN4 8DE, UK. www.chemvironcarbon.com Click here to find out more about Chemviron Carbon Ltd 
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