Regeneration of phosphate ester lubricating fluids

  • US 5,661,117 A
  • Filed: 04/14/1995
  • Issued: 08/26/1997
  • Est. Priority Date: 04/14/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of cleansing a phosphate ester lubricant fluid contaminated with metal material and phosphorous based acids to a new fluid quality having a total acid number of 0.03, said method consisting essentially of:

  • providing a source of phosphate ester lubricant contaminated with at least one metal selected from the group consisting of aluminum, chromium, tin, iron, sodium, calcium, magnesium and silicon and phosphorous based acids;

    providing a source of an anionic resin;

    passing said phosphate ester lubricant fluid contaminated with said metal and said acids into contact with said resin; and

    removing said metal compounds and said acids with said resin to provide a substantially contaminant free reusable lubricatant fluid of a new fluid quality having a total acid number of 0.03.

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