Energy requirements should be recognised
for their environmental and economic impacts and should be minimised.
Synthetic methods should be conducted at ambient temperature and pressure.
All manufacturing processes need energy to convert raw materials into
useful products. In the chemical industry it is used in several ways:
The energy used in separation, drying and waste management may be more than that used in the reaction stages.
Chemical production is much more energy-efficient than in the past. The average energy required per tonne is less than half that needed 50 years ago, and there are economic and environmental reasons to continue this trend.