Today, Ruminations will seem to be discussing difluoromonochloromethane. Though it might seem that way, we’re actually using it as a proxy for a more general “suggestion.” But, that will need to wait.
Difluoromonochloromethane has been a remarkably useful chemical compound. If you know about it at all, you probably know it as “R-22.” If you do, then you can skip right over the next sentence. R-22 is a hydrochlorofluorocarbon-based refrigerant used in about half of this country’s commercial air conditioning systems. If has some other, less common, uses but when it comes to HVAC, it is “king.” Down the road, however, it will be abdicating its office. The process began a number of years ago, but the closer we get to 2020, the clearer this will be.
This refrigerant is an ozone-depleting substance. Regardless of any reader’s position about climate change or global warming, no one thinks that destroying atmospheric ozone is a good thing. So, 30 years ago, following a series of meetings in Montreal, lots of countries, the United States included, signed an international treaty. To implement that treaty, those countries, including the United States, embarked on separate programs to end the use of ozone-depleting substances.
Here’s a short translation of what the United States did with respect to R-22 starting in 1993. Manufacture or import of equipment using R-22 refrigerant after 2009 was banned. Production or import of R-22 is banned after 2019. [By the way, by 2030, the entire class of chemical compounds known as hydrochlorofluorocarbons will no longer be manufactured in, or imported to, the United States. [Read more…]