Resource depletion, air, water, and land pollution are examples of environmental problems, which have resulted due to industrial processes. One of the main problems associated with these activities is that they have global impact. For instance, emission of greenhouse gases can occur locally, but resulting greenhouse effect will have a global character. Therefore pressures on improving process performance are rising, and hence, chemical and process industries are constantly under scrutiny of various environmental organizations. This demands more environmentally acceptable processes, products, and practices that can be achieved through ideas of “waste minimization” and “zero emission.” Initially, most industries worldwide followed end-of-pipe treatment (i.e., treatment and disposal of waste in nonhazardous form) as an approach toward dealing with process waste. But as environmental regulations have become more strict, increase in cost associated with waste treatment have led to a shift toward reduction of waste at the source or its reuse as more cost-effective waste management methods. Extrapolation of current needs leads to a picture of an unsustainable world since there is a steady decline in the natural 662resources. So design/retrofit of chemical processes has to be done through the concept of sustainability, which is promoted by green engineering (GE).