Green List waste

Wastes destined for recovery are divided info three categories - the Red, Amber and Green Lists - according to the severity of the hazards they present. Red listed wastes are the most hazardous and are subject to the full notification procedure, i.e. written prior consent of the authorities is required for each waste shipment. For Amber listed wastes, shippers and importers can take advantage of a more streamlined procedure whereby the consent of the competent authorities is assumed provided no objections are made. Green listed wastes are normally not subjected to regulation although shipments should be accompanied by a transfer note. 

This new process illustrates two of the principles of green chemistry listed above. First of all, DMC is manufactured without using the hazardous phosgene feed. In fact, the phosgene is not even produced in the new pathway. Second, the DMC can be a raw material substitution for phosgene in the manufacture of pesticides and urethanes. Furthermore, the first principle of waste management hierarchy is demonstrated in that the by-product HCl is not produced (although, if market conditions were appropriate, the HCl produced could be purified and sold as a commodity). 

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