The second thing this principle has in view is a systems perspective i.e., the ability to do mass and energy balances around a unit operation, a chemical process, a facility, or an even larger, more comprehensive and complex system like an industrial park or petrochemical complex. Most chemists and chemical engineers are less familiar with properties related to toxicity to environmental organisms and humans, and this is one of the things this principle has in view. Chemical engineers are also more familiar with properties like flammability, explosivity, compressibility, viscosity, and other properties that affect heat and mass transfer, etc. Chemists and chemical engineers are most familiar with properties like boiling point, melting points, freezing points, vapor pressure, water solubility, and so forth. David Constable, Director, ACS Green Chemistry Institute ®Īll chemicals have properties that help us to characterize and differentiate them from each other. Designers need to strive to ensure that all materials and energy inputs and outputs are as inherently nonhazardous as possible.Ĭontributed by Dr.
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