As of the late forties, the most common source of gaseous CO2 was the combustion of coke. (Nowadays, it's mostly recovered from ammonia plants.) Upon compression the gas will liquefy and can be shipped that way, at room temperature but under pressure. If pressure is released, the CO2 becomes gaseous again.toggle quoted messageShow quoted text
At a dry-ice plant, CO2 gas is allowed to expand. Gases cool upon expansion, in this case enough to solidify the material as "snow". (This isn't efficient, and excess gas is recovered.) In a hydraulic press, the "snow" is converted to blocks. These must be kept cold, and are shipped in the familiar heavily-insulated reefers.
Above info from: R.M. Reed and N.C. Updegraff, in "Encyclopedia of Chemical Technology", 3rd ed., eds. R.E. Kirk and D.F. Othmer; Interscience: New York, 1949; vol. 3, pp 128-142.
So, a CO2 tank car would be used to ship the gas and liquid from someplace coke is burnt, to a dry-ice plant. It would need to withstand high pressure and I'd think it'd be insulated.
To be concluded when I get home and look in Kaminski's tank-car book.
Al Brown, Melbourne, Fla.
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