DOE solvent handbook information sheet Page: 4 of 6
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Distillation recovery of biodegradable cleaners is not as straight forward.
Tests show that foaming is likely to be a problem and an antifoaming agent would
be necessary to break the foam in the distillation column. An appropriate
anti foaming agent is being sought at the present time.
Preliminary membrane separations tests show that, using a membrane made of
material compatible with the solvent, UF can remove contaminants in the spent
solvent. However, two problems appear to exist that will need to be solved
before a practical membrane process can be developed for solvent recovery
application. First, current commercial membranes are designed primarily for
aqueous system applications. A commercial membrane for organic solvent
application is yet to be developed. Second, for one membrane (made of cellulose
acetate) that is compatible with several substitute solvents tested, the system
pressure required to obtain measurable flux was excessive (over 600 psi versus
typical UF pressures of less than 100 psi).
HPLC analysis of fresh, spent, and recovered substitute solvents is still ongoing
to verify the integrity of the recovered solvents.
The data gathered from this testing was placed into a data base. The data base
is accessible through a modem or through an internet system. EG&G Idaho, Inc.,
will have an IBM Model 95 computer set up solely to work as a server. This will
allow the system user to access the system faster and easier. This data base
will have a query capability allowing the user to search for and access the
specific information that is of most importance to that user. This data base
will also have the capability of being a "living document". The system is
written in C Language so that it could be easily upgraded to a mini and/or a full
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Chavez, A.A. DOE solvent handbook information sheet, report, January 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1069270/m1/4/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.