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

• Current Assignee: James H. Mcateer, Joseph F. Nelson
• Original Assignee: James H. Mcateer, Joseph F. Nelson
• Inventors: Nelson, Joseph F., Mcateer, James H.
• Application Number:
  US03/362,892
• Time in Patent Office: 1,397 Days
• US Class Current: 562/511
• CPC Class Codes: C07C 51/48 by liquid-liquid treatment
• CPC Class Codes: C10G 17/04 Liquid-liquid treatment forming two immiscible phases
• CPC Class Codes: C10G 19/02 with aqueous alkaline solutions

Claims

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.