From the allocated energy demand it can be seen that nearly70% of the energy input is required as heat, which provides a possibilityto improve the overall energy efficiency by the recovery ofwaste heat from the process itself or from local industries. Lowtemperature heat could be considered for the thermal dryingprocess (<105 C) and the solvents evaporation process (<70 C).Assuming that the input energy for thermal drying and solventsevaporation could be replaced by waste heat, the FER of the wholechain will become 1.97 and 2.38 for the standard-N and low-N condition,respectively.
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