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Method and apparatus for treating objects in a closed vessel with a solvent

  • US 5,011,542 A
  • Filed: 03/09/1989
  • Issued: 04/30/1991
  • Est. Priority Date: 08/01/1987
  • Status: Expired due to Fees
First Claim
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1. In a method for the treatment of objects in a closed vessel with solvents for stripping enamel and removing coatings from the objects, in which the objects to be treated are treated for at least part of the time by immersion in solvents and subsequently washed by spraying in a solvent-free region of the vessel, the improvement which comprises that said method includes at least the following additional steps:

  • a) as solvents after closure of the treating vessels, a treating agent mixture with at least a preponderance of a solvent such as methylene chloride, and an amount of water in excess of that required to form an azeotropic mixture is used;

    b) the treating agent mixture is heated to the boiling point of the mixture;

    c) at the end of the treatment time, the settling and, if necessary, condensing solvent is removed from the treating vessel;

    d) water is heated in the treating vessel and evaporated, whereby the water acts as a heat carrier;

    e) the solvent on or in the coating or enamel residues and the objects to be treated is distilled off azeotropically from the system with water and removed before the vessel is opened.

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