Mineral- and Clay-Based Absorbents
Examples of Mineral-Based and Clay-Based Absorbents include Budget Dry® (ground clay), kitty litter, Safe-T-Sorb® (ground clay), Vermiculite (composition varies with source), and Zorball®. The following categories of chemicals have been known to react (that is, are incompatible ) with Mineral-Based and Clay-Based Absorbents:
Category: Amines and Other Bases
- Reason for Concern:ÌýThese chemicals may exhibit high heats of absorption. The degree of hazard is highly dependent on the individual combination of materials. Test to determine compatibility.
- Examples:ÌýDiethylamine; Ethanolamine; Pyridine; Tripropylamine
- Reactive Groups:ÌýAmines, Phosphines, and Pyridines; Bases, Strong
Category: Epoxide Monomers
- Reason for Concern:ÌýMonomers Ìýwith an ethylene oxide/oxirane functionality may react with the active sites in the absorbent, catalyzing an exothermic epoxide ring opening.
- Examples:ÌýEthylene oxide (EO); Propylene oxide (PO)
- Reactive Groups:ÌýEpoxides
Note: Although epoxide and styrenic monomers have known incompatibilities with Mineral-Based and Clay-Based Absorbents, other monomers may be compatible. Acrylates and Acrylic Acids are acceptable to use with Clay-Based Absorbents (Hankin. 1986. Journal of Hazardous Materials. 13: 217-226.). Under worst-case adiabatic conditions, ARC results and modeling indicate that spills of these inhibited monomers can be treated with Clay-Based Absorbents, when the same care and precautions are taken as with Non-Clay-Based Absorbents.
Category: Hydrofluoric Acid
- Reason for Concern:ÌýHydrofluoric acid may react exothermically with the silicate structure in these absorbents. Aqueous solutions of other inorganic fluorides could also contain hydrofluoric acid, and so would react similarly with Clay-Based Absorbents.
- Examples:ÌýHydrofluoric acid; Ammonium bifluoride solution; Sodium fluorosilicate solution; Boron trifluoride diethyl etherate
- Reactive Groups:ÌýFluoride Salts, Soluble
Category: Styrenic Monomers
- Reason for Concern:ÌýAbsorbent may catalyze exothermic, uncontrolled polymerization leading to a thermal runaway, which could result in a fire or explosion .
- Examples:ÌýStyrene; Divinylbenzene (DVB); Vinylbenzyl chloride (VBC)
- Reactive Groups:ÌýPolymerizable Compounds
Note: Although epoxide and styrenic monomers have known incompatibilities with Mineral-Based and Clay-Based Absorbents, other monomers may be compatible. Acrylates and Acrylic Acids are acceptable to use with Clay-Based Absorbents (Hankin. 1986. Journal of Hazardous Materials. 13: 217-226.). Under worst-case adiabatic conditions, ARC results and modeling indicate that spills of these inhibited monomers can be treated with Clay-Based Absorbents, when the same care and precautions are taken as with Non-Clay-Based Absorbents.
Category: Water-Reactive 365betÓéÀÖ
- Reason for Concern:ÌýClay-Based AbsorbentsÌýoften contains moisture, which could pose a hazard if they are used to clean up water-reactive chemicals. Many water-reactive chemicals release toxic or corrosive gases and generate heat when they come into contact with even small amounts of water.
- Examples:ÌýMethyl isocyanate; Acetyl chloride; Acetic anhydride; Phenyltrichlorosilane
- Reactive Groups:ÌýAcid Halides, Sulfonyl Halides, and Chloroformates; Anhydrides; Chlorosilanes; Halogenating Agents; Isocyanates and Isothiocyanates; Thiocarbamate Esters and Salts/Dithiocarbamate Esters and Salts