Water treatment method and water treatment apparatus
US-2024383788-A1 · Nov 21, 2024 · US
Separation of hydrocarbons from aqueous mixture using fouling resistant reverse osmosis membrane
US2016304363A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016304363-A1 |
| Application number | US-201415035900-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 15, 2014 |
| Priority date | Jan 7, 2014 |
| Publication date | Oct 20, 2016 |
| Grant date | — |
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Abstract
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A method for separating hydrocarbons and naphthenic acid from an aqueous mixture containing the same by passing the mixture through a spiral wound element to produce a permeate stream and concentrate stream wherein the concentrate stream has a relatively higher concentration of hydrocarbons than the permeate stream, wherein the spiral wound element includes a composite poly amide membrane comprising a porous support and a thin film poly amide layer, wherein the membrane is characterized by having: i) a NaCl rejection and a benzene tetra carboxylic acid rejection of at least 98% when tested with an aqueous solution containing 2000 ppm NaCl and 100 ppm benzene tetra carboxylic acid at 25° C., pH 8 and ImPa (150 psi); and ii) a dissociated carboxylate content of at least 0.3 moles/kg of polyamide at pH 9.5 as measured by Rutherford Backscattering (RBS).
First claim
Opening claim text (preview).
1 . A method for separating hydrocarbons and naphthenic acid from an aqueous mixture containing the same by passing the mixture through a spiral wound element to produce a permeate stream and concentrate stream wherein the concentrate stream has a relatively higher concentration of hydrocarbons than the permeate stream, wherein the spiral wound element includes a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the membrane is characterized by having: i) a NaCl rejection and a benzene tetra carboxylic acid rejection of at least 98% when tested with an aqueous solution containing 2000 ppm NaCl and 100 ppm benzene tetra carboxylic acid at 25° C., pH 8 and 1mPa (150 psi); and ii) a dissociated carboxylate content of at least 0.3 moles/kg of polyamide at pH 9.5 as measured by Rutherford Backscattering (RBS). 2 . The method of claim 1 wherein the membrane is characterized by having a NaCl rejection and a benzene tetra carboxylic acid rejection of at least 99% when tested with an aqueous solution containing 2000 ppm NaCl and 100 ppm benzene tetra carboxylic acid at 25° C., pH 8 and 1 mPa (150 psi). 3 . The method of claim 1 wherein the membrane is characterized by having a dissociated carboxylate content of at least 0.4 moles/kg of polyamide at pH 9.5 as measured by Rutherford Backscattering (RBS). 4 . The method of claim 1 wherein the aqueous mixture has a pH below 5. 5 . The method of claim 1 wherein the aqueous mixture has a pH below 3. 6 . The method of claim 1 wherein the aqueous mixture comprises at least 500 ppm of NaCl.
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Classifications
Polyamides, e.g. polyester-amides · CPC title
Specific permeability or cut-off range · CPC title
Reverse osmosis; Hyperfiltration · CPC title
from quarries or from mining activities · CPC title
characterised by their properties · CPC title
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- What does patent US2016304363A1 cover?
- A method for separating hydrocarbons and naphthenic acid from an aqueous mixture containing the same by passing the mixture through a spiral wound element to produce a permeate stream and concentrate stream wherein the concentrate stream has a relatively higher concentration of hydrocarbons than the permeate stream, wherein the spiral wound element includes a composite poly amide membrane compr…
- Who is the assignee on this patent?
- Dow Global Technologies Llc
- What technology area does this patent fall under?
- Primary CPC classification C02F1/441. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Oct 20 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).