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 Title: |
US5250185:
Reducing aqueous boron concentrations with reverse osmosis membranes operating at a high pH
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Tao, Fansheng T.; Sugar Land, TX
Pilger, Paul F.; Denver, CO
Dyke, Charles A.; Beacon, NY
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| Assignee: |
Texaco Inc., White Plains, NY
other patents from TEXACO INC. (569900) (approx. 4,410)
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| Published / Filed: |
1993-10-05
/ 1992-05-01
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| Application Number: |
US1992000877689
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| IPC Code: |
Advanced:
B01D 61/02;
B01D 61/04;
C02F 1/44;
Core:
more...
IPC-7:
B01D 61/02;
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| U.S. Class: |
Current:
210/654;
210/500.38;
Original:
210/654;
210/500.38;
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| Field of Search: |
210/638,655,634,639,644,649-654,500.37,500.38
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| Priority Number: |
| 1992-05-01 |
US1992000877689 |
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| Abstract: |
A method of treating an aqueous charge liquid, such as oilfield produced waters, containing boron and solubilized hydrocarbon compounds to reduce boron concentration, which comprises water softening to remove substantially all divalent cations, raising the pH of the liquid above about 9.5, and driving the liquid through a reverse osmosis membrane.
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| Attorney, Agent or Firm: |
Bailey, James L. ;
Park, Jack H. ;
Delhommer, Harold J. ;
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| Primary / Asst. Examiners: |
Sever, Frank;
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 9 claims |
What is claimed is:
1. A method of treating an aqueous charge liquid containing boron and solubilized hydrocarbon compounds to substantially reduce boron concentration, which comprises:
- passing an aqueous charge liquid containing boron and solubilized hydrocarbon compounds through a water softener to remove substantially all divalent cations from the aqueous charge liquid;
- raising the pH of the aqueous charge liquid above about 9.5;
- passing the aqueous charge liquid into contact with the high pressure side of a reverse osmosis membrane, said reverse osmosis membrane being a cross-linked, interfacially polymerized, aromatic polyamide membrane having properties sufficient to resist degradation under a pH above about 9.5;
- recovering from the low pressure side of the reverse osmosis membrane an aqueous permeate containing less than about 2 mg/L boron; and
- recovering from the high pressure side of the reverse osmosis membrane an aqueous retentate having a substantially higher concentration of boron.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 21 U.S. patent(s) that reference this one
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