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'Switchable' Solvents Make Chemical Manufacturing More Environmentally-friendly

Date:
August 25, 2005
Source:
Queen's University
Summary:
Researchers from Queen's University and the Georgia Institute of Technology have discovered a new environmentally-friendly way to make chemicals for pharmaceutical and other industries, such as plastics, pesticides, dyes and fragrances.

Charles Eckert (left) and Charles Liotta were part of team of researchers that recently reported the development of "switchable solvents" whose properties can be rapidly changed. (Georgia Tech Photo: Nicole Cappello)

Researchers from Queen’s University and the Georgia Instituteof Technology have discovered a new environmentally-friendly way tomake chemicals for pharmaceutical and other industries, such asplastics, pesticides, dyes and fragrances.

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The team, led byQueen’s chemist Dr. Philip Jessop, has developed new solvents (liquidsthat dissolve other substances) that are both cleaner and cheaper whenused in the production of many chemicals. Because each step in achemical process often requires a different solvent, there can be agreat deal of waste which is both costly and damaging to theenvironment.

“We all want the products of the plastics andpharmaceutical industries, but we don’t want the pollution,” says Dr.Jessop, Canada Research Chair in Green Chemistry. “Our research isseeking ways to decrease the amount of solvent waste generated by thesecompanies.” In the ratio of waste-to-product, pharmaceutical and other“fine chemical” industries are far dirtier than the oil industry, henotes.

These new “switchable” solvents discovered by Dr. Jessop’steam change their properties when alternately exposed to carbon doxideand nitrogen, making it possible to re-use the same solvent formultiple steps in a chemical process, rather than discarding andreplacing the solvent after each stage.

Also on the team from theQueen’s Chemistry Department are graduate students David Heldebrandtand Xiaowang Li, and from the Georgia Institute of Technology Drs.Charles Eckert and Charles Liotta, both winners of 2004 PresidentialGreen Chemistry Challenge Awards.

The organic solvents tested bythis research group are known as ionic liquids: a salt that is moltenat room temperature, or near-room temperature. “They have been widelyhailed as environmentally benign because they have no vapor pressure,and they also have some unusual properties,” says Dr. Eckert, aprofessor in the School of Chemical and Biomolecular Engineering atGeorgia Tech.

However, the new ionic liquids are differentbecause exposure to nitrogen gas causes them to change back intoregular (non-ionic) liquids. “It’s a potential tool for benign andeconomical processing in the manufacture of high-value-added specialtychemicals, such as pharmaceuticals,” Dr. Eckert adds.

Greenchemistry refers to the development of chemical products and processesthat reduce or eliminate the use and generation of hazardoussubstances. Rather than focusing on the natural environment andpollutant chemicals in nature, this type of chemistry seeks to reduceand prevent pollution at its source. “We’re concerned with pollutionprevention rather than treatment,” says Dr. Jessop. “That’s a much moreeconomical way to approach the problem.”


Story Source:

The above story is based on materials provided by Queen's University. Note: Materials may be edited for content and length.


Cite This Page:

Queen's University. "'Switchable' Solvents Make Chemical Manufacturing More Environmentally-friendly." ScienceDaily. ScienceDaily, 25 August 2005. <www.sciencedaily.com/releases/2005/08/050825072308.htm>.
Queen's University. (2005, August 25). 'Switchable' Solvents Make Chemical Manufacturing More Environmentally-friendly. ScienceDaily. Retrieved October 31, 2014 from www.sciencedaily.com/releases/2005/08/050825072308.htm
Queen's University. "'Switchable' Solvents Make Chemical Manufacturing More Environmentally-friendly." ScienceDaily. www.sciencedaily.com/releases/2005/08/050825072308.htm (accessed October 31, 2014).

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