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US 5,296,164 AGranted
High-stability foams for long-term suppression of hydrocarbon vapors
AssigneeAtlantic Richfield Company
InventorsSophany Thach, Kenneth C. Miller, Karen S. Schultz
Life of this patent
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Abstract
Novel formulations for aqueous foams which, in the presence of hydrocarbons, can persist for 24 hours or more. The foams are suitable for the suppression of hydrocarbon and polar organic vapors.
Claims16
A foam solution, comprising:
- a) about 0.1 to 6.0% by weight of a water-soluble nonionic surfactant;
- b) about 0.01 to 1.0% by weight of a fluorinated co-surfactant;
- c) about 1.0 to 10.0% by weight of a polyol stabilizer;
- d) about 500 to 5,000 ppm of a viscosifier selected from the group consisting of xanthan gum and welan gum;
- and
- e) water;
- said foam solution being capable of forming a foam having a persistence of at least 12 hours at temperatures of from 75 to 105.degree. F.
4 more elements
A foam comprising:
- from 10 to 1,000 parts of gas to 1 part of dilute foam solution comprising:
- a) about 0.1 to 6.0% by weight of a water-soluble nonionic surfactant;
- b) about 0.01 to 1.0% by weight of a fluorinated surfactant;
- c) about 1.0 to 10.0% by weight of a stabilizer;
- d) about 500 to 5,000 ppm of a viscosifier selected from the group consisting of xanthan gum and welan gum;
- and
- e) water;
- wherein said foam has a persistence of at least 12 hours at temperatures of from 75 to 105.degree. F.
5 more elements
Dependencies are inferred from the claim text.