Chemical Engineering August 2021 - 4

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'Green' chemistry winners
T
his year marks the 25th anniversary of the Green Chemistry
Challenge Awards - a program that is sponsored by the
U.S. Environmental Protection Agency's (EPA; www.epa.gov)
Office of Chemical Safety and Pollution Prevention, and cosponsored
by the American Chemical Society (ACS; www.acs.org).
The awards aim to recognize and promote achievements that reduce
hazards to people and the environment, while also attaining economic
benefits. The following five outstanding achievements have been
named as the 2021 Green Chemistry Challenge Award winners.*
Greener Synthetic Pathways - Merck & Co., Inc. (www.merck.
com) received this award for developing a more sustainable process
for manufacturing gefapixant citrate, which is a medication for chronic
cough. Merck was able to achieve a higher yield process with a sixfold
reduction in raw material costs, while also replacing an alkylation
step that involved hazardous materials. Merck implemented a measurement
tool called process mass intensity (PMI) as a measure of
process efficiency for biopharmaceutical production. The initial process
had a PMI of 366, and the improved process registered a PMI of
88, an improvement by more than a factor of four.
Greener Reaction Condition - This award went to Bristol Myers
Squibb (www.bms.com) for developing a new, sustainable class of
chemical reagents for solid-phase synthesis that are derived from limonene,
a waste product from discarded citrus peels. A key element in
this technology is the use of phosphorus reagents instead of the traditional
oxidation reaction. This change reduces the amount of reagent
and solvent required and is said to improve the stability of the reagent
and intermediate products. The need for specialized technology and
shipping and storage has also been eliminated, since the phosphorus
reagents are more tolerant to air and moisture.
Designing Greener Chemicals - Colonial Chemical, Inc. (www.
colonialchemical.com) received this award for developing surfactant
blends that are derived from plant-based materials, are biodegradable,
and have shown the potential to replace ethylene oxide (EO)
containing surfactants. The process uses only water as a solvent
and consumes less energy than processes using petroleum-based
raw materials. The surfactants are functionalized alkyl polyglucosides
(APGs) that are said to provide cleaning performance that is equal to
or better than alkylphenol ethoxylates (APEs), while avoiding the environmental
issues associated with APEs.
Small Business - This award recognizes XploSafe LLC ( www.
xplosafe.com ) for its novel sorbent that can capture ammonia, phosphate
and nitrate from contaminated water. Various metal oxides,
which can adsorb various nutrients, are combined and the material
can be turned into granules and used as a time-release fertilizer. The
technology offers cost and utility advantages over standard biological
and chemical treatment solutions. Hydra Water Technologies, a spin-off
from XploSafe, manufactures the material under the name PhosRox.
Academic - This honor was awarded to a team
led by professor Srikanth Pilla of Clemson University
(www.clemson.edu) for creating the first
lignin-based non-isocyanate polyurethane foam.
The lignin-based foam can be chemically recycled,
and the catalyst can also be recycled. The innovative
process to make this foam uses non-toxic, biobased
reagents, and does not use diisocyanates. ■
Dorothy Lozowski, Editorial Director
* Source: EPA; More details about the award process and the winners can be
found on the EPA's website, www.epa.gov
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
AUGUST 2021
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Chemical Engineering August 2021

Table of Contents for the Digital Edition of Chemical Engineering August 2021
