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Pyrolytic conversion of paint sludge to useful materials

  • US 5,543,367 A
  • Filed: 07/28/1995
  • Issued: 08/06/1996
  • Est. Priority Date: 07/28/1995
  • Status: Expired due to Fees
First Claim
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1. A process for decomposing dried paint sludge to recover the organic and inorganic components of the paint sludge as gaseous, liquid, and composite materials, which process comprises the steps of:

  • drying the paint sludge at a temperature below about 200°

    C. for a time sufficient to remove water and organic solvents present in the paint sludge;

    pyrolizing the dried paint sludge in an inert atmosphere comprising nitrogen or argon at an elevated temperature of up to about 600°

    C. for a time sufficient to form gaseous and liquid decomposition materials and a solid residue;

    collecting the gaseous and liquid decomposition materials; and

    subjecting the solid residue to further pyrolysis in an atmosphere selected from the group consisting of nitrogen, argon and ammonia at a temperature of between about 900°

    C. and 1300°

    C. for a time sufficient to sinter the solid residue to form an inorganic composite material comprising barium titanate and titanium compounds.

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