However, in 1996, an estimated 19 million short tons of volatile organic compounds were emitted in the United States, of which 33% came from solvent utilization. Since the industrial revolution, it has been found that the use of chemical mixtures during specific steps of industrial processes improves product development. This method can be a very effective way of finding greener replacements for harmful solvents used by industry. Optimal replacements can then be compared again and selected for better performance, but less environmental impact. These extensive searches may be enhanced by fine-tuning impact weighting factors to better reflect regional environmental concerns and by adjusting how close the properties of the replacement must be to those of the original solvent. Greener solvent substitutes may then be chosen from those mixtures that behave similarly but have less environmental impact.
By searching extensively though hundreds of millions of possible solvent combinations, mixtures that perform the same as the original solvents may be found. PARIS III (Program for Assisting the Replacement of Industrial Solvents III, Version 1.4.0) is a pollution prevention solvent substitution software tool used to find mixtures of solvents that are less harmful to the environment than the industrial solvents to be replaced.
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