In article ,
mm wrote:

Where is a "safe place" to dispose of small, 14 oz. propane tanks?

The trash.

Unless it is a very OLD cylinder, contemporary disposal instructions should be
on a label on the tank. Still, if it is "completely" empty, there is no good
reason to not place it into the general waste stream.

It is virtually inert and of small enough capacity that any remaining gas is
of no concern. It will eventually rust away underground. In a modern
landfill, this would cause NO problem.

Recycling of this type of container is not recommended or allowed (I believe)
due to the possibility of residual gas.
--

JR