Monthly Archives: June 2010

Needlessly invoking clathrates. BP’s underwater ice machine.

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In the news reporting on the BP oil spill, there is talk of methane/water forming a special ice composition that defeated the previous attempt to channel oil to the surface.  I think folks are referring to clathrate formation. This ice blocked the flow of petroleum from the concrete structure that was lowered over the well head.

But, here is the deal. Wouldn’t you expect cooling of a compressed gas as it exits the well pipe and into the sea water? Isn’t this just an example of the Joule-Thompson effect?  As the natural gas component of the petroleum discharge exits the pipe, it is going to expand somewhat, even at a one mile depth, and cool the surrounding water. If this occurs in unconfined, open water, the jet of petroleum will entrain water in the flow and be warmed by the continuous flow of heat from the water.

But, if the gas/oil mixture of petroleum is ejected in a confined space that interferes with heat transfer, then one would expect the expansion cooling of the gas phase to predominate and cool the water in the confining space, possibly to the freezing point. Clathrates may be formed, but the simplest explanation is from good old thermodynamics.

Minnesota’s fabulous Cu-Ni-Pt-Pd-Au Nokomis deposit

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A world class non-ferrous mineral deposit in Minnesota is on the cusp of opening.  Duluth Metals, a Canadian mining company, has been engaged since at least 2006 in developing its Nokomis property in northern Minnesota along the north shore of Lake Superior. The magnitude of the find is stunning and Minnesota will eventually be synonymous with non-ferrous metals like copper, nickel, platinum group metals, and Norwegian bachelor farmers.  The Duluth complex is part of the second largest mafic intrusion in the world, second only to the Bushveld complex in South Africa.

Mining people are accustomed to looking at these reports and the accompanying prospectus. But it is interesting for we sheltered, begloved, and begoggled chemists to view the birth of a new mining district from the protected confines of our air conditioned laboratories. Perhaps in a few years Minnesota palladium will catalyze your Suzuki coupling.