Are there any significant industrial processes that use liquid ammonia as a solvent?

There are some interesting laboratory reactions that use liquid ammonia as a solvent (for example, the [Birch Reduction](http://en.wikipedia.org/wiki/Birch_reduction) where an alkali metal is dissolved in liquid ammonia).


There have also been some high volume industrial processes that use liquid ammonia as a solvent (the weedkiller paraquat has two, quite different, production routes using liquid ammonia producing thousands of tonnes a year). One uses dissolving sodium (like the Birch reduction):


![wikipedia description of one paraquat synthesis](https://i.stack.imgur.com/cUNyr.png)


But are there any other significant chemical manufacturing processes that use it? 


NB I would include the production of pharmaceuticals or their ingredients as well as any bulk chemicals.




I might be terribly wrong, but I'm not aware of any other industrial process involving ammonia as a reactant (fertilizers, caprolactam, amino acids) where liquid ammonia is used as a solvent. 


As a side note, liquefication at least plays a role over here (Germany) for the transport in [rail tank cars](http://www.abload.de/image.php?img=dsc_9733s8udq.jpg).


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