The amount of waste produced in the manufacture of a chemical product or a product of any kind should be minimized.  While one would intuit that this measure was always part of manufacturing efficiency, it was not. The introduction of the calculation of the E-Factor took the original form of:

E-Factor = kg waste / kg product

and can be adjusted to include a variety of aspects of the manufacturing process.  E-factor provides information that was historically neglected but is critical to moving toward more efficient and effective chemical production.

Center for Green Chemistry and Green Engineering at Yale

Visit us at https://greenchemistry.yale.edu/

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