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As originally designed, it was meant very specifically to measure water content in petroleum products. A Barrett trap, with a stopcock on the burette is used for more general purposes. The use of a trap with an integrated burette may be less effective than using more general labware to produce a
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similar azeotropic reflux separation. Industrially you may find an application requiring a system like this, that is a cold trap with a valved condensate drain.
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Rather than estimating water content, it is not much more commonly used to extract water and thereby drive a reaction equilibrium toward the desired outcome?
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https://web.archive.org/web/20051120121940/http://www.uni-regensburg.de:80/Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/D-Ester-e.htm
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These are all often still called a Dean Stark trap, due to scientific naming conventions.
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Dean, E.W.; Stark, D.D., Ind. Eng. Chem. 1920, 12, 486 --
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