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US 12,595,436 B2Granted
Chemical product comprising an anionic surfactant, chelant, and enzyme, and process for cleaning nanofiltration and reverse osmosis membranes
AssigneePetroleo Brasileiro S.A. - Petrobras
InventorJoselito Barbosa Maciel
Life of this patent
Estimating the term…
Abstract
The present invention relates to a chemical product and process for cleaning nanofiltration and reverse osmosis membranes, based on enzymatic action aiming to remove biofouling and inorganic scale quickly. The product mentioned in present invention also proposes elimination of the neutralization step of the chemical product used, given that the enzymatic action allows an adequate pH for disposal to be maintained, which fact increases the speed and efficiency of the process.
Claims9
A chemical product for cleaning nanofiltration and reverse osmosis membranes consisting of:
- A) from 0.1 to 10% of a surfactant agent selected from the group consisting of dodecylbenzene sodium sulfonate, sodium lauryl sulfate, sodium lauryl ether sulfate, and sodium stearate;
- B) a chelating agent selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), sodium or potassium salt thereof, and diethylenetriaminepentaacetic acid (DTPA), or sodium or potassium salt thereof;
- C) an enzymatic agent selected from the group consisting of an amylase, a cellulase, a xylanase, a lipase, and a mixture of these enzymes;
- and
- D) a buffering (pH regulating) solution.
2 more elements
Dependencies are inferred from the claim text.