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Recovery of naphthenic acids

  • US 2,789,134 A
  • Filed: 06/19/1953
  • Issued: 04/16/1957
  • Est. Priority Date: 06/19/1953
  • Status: Expired due to Term
First Claim
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1. A CONTINUOUS PROCESS FOR RECOVERING NAPHTHENIC ACIDS FROM A NAPHTHENIC ACID-CONTAINING PETROLEUM DIESEL OIL DISTILLATE FRACTION HAVING AN END POINT OF ABOUT 625* F. WHICH COMPRISES THE STEPS OF EXTRACTING THE DIESEL OIL FRACTION WITH AN AQUEOUS SOLUTION OF A SODIUM SALT SELECTED FROM THE GROUP CONSISTING OF SOLIUM CARBONATE, SODIUM BICARBONATE, AND THEIR MIXTURES;

  • SEPARATING THE RESULTING MIXTURE INTO AN ORGANIC PHASE AND AN AQUEOUS SODIUM NAPHTHENATE-CONTAINING PHASES;

    SEPARATING THE AQUEOUS PHASE FROM THE ORGANIC PHASE;

    CONTACTING THE SEPARATED AQUEOUS PHASES WITH CARBON DIOXIDE AT A PRESSURE IN EXCESS OF 100 P.S.I.G. IN A PRESSURE ZONE TO CONVERT THE NAPHTHENATES TO NAPHTHENIC ACIDS;

    SEPARATING THIS RESULTING MIXTURE AT THE AFORESAID CARBON DIOXIDE PRESSURE INTO AN AQUEOUS PHASE CONTAINING DISSOLVED SODIUM BICARBONATE AND A NAPHTHENIC ACID ORGANIC PHASE;

    CONVERTING THE AQUEOUS SODIUM BICARBONATE TO AQUEOUS SODIUM CARBONATE AND CARBON DIOXIDE;

    RECYCLING THE LIBERATED CARBON DIOXIDE TO THE AFOREMENTIONED PRESSURE ZONE;

    RECYLING THE AQUEOUS SODIUM CARBONATE PHASE TO THE EXTRACTION STEP;

    AND FREEING THE NAPHTHENIC ACIDS OF CARBON DIOXIDE TO OBTAIN THE NAPHTHENIC ACID PRODUCT.

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