H ----tl Green Solvents ! Project Phillip Maloney Background o Necessary for safe and proper functioning of equipment o Mainly halogenated solvents o Carbon tetrachloride o Trichloroethylene {TCE) o CFC-113 o No longer used due to regulatory/safety concerns 11/6/2012 1
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H----tl Green Solvents! Project
Phillip Maloney
Background
o Necessary for safe and proper functioning of equipment
o Mainly halogenated solvents
o Carbon tetrachloride
o Trichloroethylene {TCE)
o CFC-113
o No longer used due to regulatory/safety concerns
11/6/2012
1
Precision Cleaning at KSC
o Small %of total parts
o Used for liquid oxygen (LOX) systems
o Dual solvent process
o Vertrel MCA (decafluoropentane (DFP) and trons-dichloroethylene)
o HFE-7100
o DFP has long term environmental concerns
Specifications and Analysis
o Highest level at KSC- 25A
o Verified by particle counting and NVR analysis
11/6/2012
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11/6/2012
Project Goals
o Identify potential replacements
o 22 wet chemical processes
o 3 alternative processes
o Develop test procedures
o Contamination and cleaning
o Analysis
o Use results to recommend alternative processes
Candidate Process Criteria
o Good solvency
o Low toxicity
o LOX compatible
o Environmentally
friendly
o Low surface tension
o High vapor pressure
o Inexpensive
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Processes Evaluated
Pure Solvents Proprietary Solvent Alternative Formulations Technologies