Cleaning and liquid contact with solids – Processes – Using sequentially applied treating agents
Patent
1992-04-22
1994-04-05
Breneman, R. Bruce
Cleaning and liquid contact with solids
Processes
Using sequentially applied treating agents
134 10, 134 11, 134 12, 134 30, 134 38, 134 40, 134 42, 134 31, 252162, 252153, 252170, 252171, B08B 300, B08B 308, C11D 100, C11D 750
Patent
active
053001540
ABSTRACT:
The invention relates to methods and compositions for cleaning a wide range of soil types from dirty articles, such as metal, ceramic or glass substrates. A first class of solvent compositions used for cleaning is an oxidative stable mixture of non-polar aromatic hydrocarbons and an organic polar component for cleaning of low and intermediate polar soils. Alternately, water and surfactant is added to the mixture to form a water-in-oil emulsion for cleaning high polarity soils. A second class of solvent compositions used for cleaning dirty articles is a hydrogenated or dehydrogenated analogue of a terpene compound. The solvent composition is used in a process wherein a dirty article is contacted with the solvent under conditions that result in cleaning the soil type from the article. Residual solvent contamination is removed from the article surface by contacting the contaminated article at an elevated temperature with an aqueous medium and/or a low-boiling solvent. The solvent residue is then removed by evaporation.
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Ferber Gerald J.
Smith Graham J.
Breneman R. Bruce
Bush Boake Allen Limited
El-Arini Zeinab
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