Question

Green Chemistry is often said to be a 'cradle to grave' approach. Explain what this term means with specific reference to the industrial production of polyethylene.

Answer 1

Solution :

‘Cradle to grave‟ describes the need to consider ALL factors in the production of a chemical from the source of the raw materials, to the disposal / recycle of the product once its useful lifetime has ended.

Possible factors might include: • ethylene is produced from petroleum feedstocks (is biomass an alternative, renewable source?)

• catalysts greatly reduce the temperature and pressure conditions

• no solvents are used (gas phase monomer passed over a solid catalyst)

• minimal waste

• polyethylene is non-degradable, therefore it contributes significantly to landfill; recycling is difficult and energy intensive .

• energy requirements, transportation to market etc.

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