Why were some halocarbons solvents banned but some are still in use?

The solvents that were banned were the ones that were chemically very stable and survived for very long periods of time in the atmosphere. These materials eventually travelled to the ozone layer and were involved in photochemical reactions which destroyed ozone and these were banned under the Montreal Protocol.

In contrast, other halocarbon solvents are less chemically stable and breakdown lower in the atmosphere, so do not have a major impact on the ozone layer and these are still in uses in some applications

However, there is continuing concern about the use of many organic solvents in terms of their effect upon human health and their effect on the environment. It seems very likely that further restrictions on the use of halocarbon substances will be invoked.

 

Barrie Mellor

 

 

 

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