Separation of water-soluble organic electrolytes
AssigneeTexaco Inc.
InventorsCraig R. Bartels, John Reale, Jr.
Life of this patent
Estimating the term…
Abstract
Water-soluble organic electrolytes, such as anions of lower carboxylic acids in aqueous solution at low pH, are removed by raising the pH and subjecting the resultant charge liquid to nanofiltration.
Claims15
The method of treating an aqueous charge liquid having a low charge pH and containing dissolved water-soluble organic electrolytes which comprises
- raising the pH of said aqueous charge thereby forming an alkalized aqueous charge liquid containing dissolved water-soluble organic electrolytes;
- nanofiltering said alkalized aqueous charge containing dissolved water-soluble organic electrolytes thereby forming (i) aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes and (ii) aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes;
- recovering said aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes;
- and
- recovering said aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes.
The method of treating an aqueous charge liquid as claimed in claim wherein said dissolved water-soluble organic electrolytes include anions of organic monocarboxylic acids.
The method of treating an aqueous charge liquid containing produced water of low charge pH of about 4-7 from a petroleum producing operation, said charge liquid containing dissolved water-soluble organic electrolytes which comprises
- raising the pH of said aqueous charge liquid thereby forming an alkalized aqueous charge liquid containing dissolved water-soluble organic electrolytes;
- nanofiltering said alkalized aqueous charge containing dissolved water-soluble organic electrolytes thereby forming (i) aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes and (ii) aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes;
- recovering said aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes;
- and
- recovering said aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes.
The method of treating an aqueous charge liquid having a low charge pH of 3-7 and containing dissolved water-soluble organic electrolytes which comprises
- raising the pH of said aqueous charge liquid to 7-11 thereby forming an alkalized aqueous charge liquid of pH 7-11 containing dissolved water-soluble organic electrolytes;
- nanofiltering said alkalized aqueous charge liquid of pH 7-11 containing dissolved water-soluble organic electrolytes thereby forming (i) aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes and (ii) aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes;
- recovering said aqueous retentate containing an increased concentration of dissolved water-soluble organic electrolytes;
- and
- recovering said aqueous permeate containing a decreased concentration of dissolved water-soluble organic electrolytes.
Dependencies are inferred from the claim text.