Historical Use of Chlorinated Solvents and Their Stabilizing Compounds - Environmental Investigation and Remediation - page 65

TABLE 1.34
Organic Carbon Partition Coeffi cient Contrasts for Stabilizers with Trichloroethylene

K oc Ratio
(Stabilizer:Solvent) Stabilizer Log K oc Rank

Retained in Filter
2,6-di- tert -Butyl- p -cresol 3.14 6.607 1

Decreasing Retention in Carbon Filter
Cyclohexane 2.2 0.759 2

Benzotriazole 2.16 0.692 3

Triethylamine 2.16 0.692 3

Diisopropylamine 2.15 0.676 5

Diallylamine 1.98 0.457 6

Ethyl acetate 1.77 0.282 7

Epichlorohydrin 1.6 0.191 8

1,2-Butylene oxide 0.90 0.038 9

Thymol 0.52 0.016 10

n -Methylmorpholine 0.474 0.014 11

Butoxymethyl oxirane 0.24 0.008 12

Source: See Appendix 2 for a tabulation of physical and chemical properties of solvent-stabilizer compounds with full
citations.
Note: For perchloroethylene, log K oc = 2.32.

to form a i lterable residue, thereby decreasing the contact time with agents that could break down
perchloroethylene. The powder also buffers the pH to increase the effectiveness of detergents added
to perchloroethylene to remove water-soluble soil from clothing (Laidlaw Company, 2004).
The idea of adding stabilizers back to solvents predates vapor degreasing. A 1937 patent notes
that solvent life may be indei nitely extended by repeated additions of stabilizing agents (Dinley,
1937). The concept of developing a concentrated stabilizer package was i rst described in a 1958
patent application (Kauder, 1960).

ACKNOWLEDGMENTS
The review and comments by Richard Doherty of Engineering and Consulting Resources Inc. in
Acton, Massachusetts, are much appreciated.

BIBLIOGRAPHY
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AFSC ME (American Federation of State, County and Municipal Employees), 2006, Welding hazards. http://
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