Cleaning composition for reverse osmosis membrane and preparation method of cleaning composition

A technology for cleaning composition and reverse osmosis membrane, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve the problems of reverse osmosis membrane harm, prolong cleaning time, clean thoroughly, etc., and achieve stable pH value , The effect of strong dispersibility and strong cleaning ability

Active Publication Date: 2019-03-22
CHENGDU WANCHAO SURFACE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many reverse osmosis membrane cleaning agents on the market, the components are basically industrial hydrochloric acid and citric acid, which can partially remove the common inorganic carbonate (CaCO 3 ), sulfate (CaSO4 2H 2 O), water and aluminum oxide (Al 2 o 3 ·nH 2 O) and other dirt, but silicates (CaSiO 3 ) and hydrated iron scale (Fe 2 o 3 ·nH 2 O) the effect is unsatisfactory, especially the influent containing silicon and iron in the feed water, silicate and Fe 3+ Seriously polluted membranes are very difficult to clean thoroughly by conventional cleaning. After cleaning, the membrane pressure difference, permeated water volume, and permeated water conductivity are difficult to completely recover, or multiple cleanings, or prolonging the cleaning time, will cause great harm to the reverse osmosis membrane. Even lead to early scrapping of reverse osmosis membrane

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  • Cleaning composition for reverse osmosis membrane and preparation method of cleaning composition

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preparation example Construction

[0050] A preparation method for a cleaning composition for a reverse osmosis membrane, comprising the steps of:

[0051] A. Add NH 4 HF 2 After mixing with desalinated water, NH 4 HF 2 solution;

[0052] B. HCl, H 3 PO 4 , carboxyethylthiosuccinic acid, fatty acid methyl ester ethoxylate sulfonate were added to NH 4 HF 2 Mix in the solution until the solution is clear to obtain a clear solution;

[0053] C. Mix the clear solution with NH 3 After mixing and ripening, a cleaning agent is obtained.

[0054] Further, the pH value of the cleaning agent in step C is 1.5-4.7.

Embodiment 1

[0056] A kind of cleaning composition for reverse osmosis membrane, is made up of the component of following percentage by weight: Industrial hydrochloric acid (HCl mass fraction is 30%) 16%; Industrial phosphoric acid (H 3 PO 4 Mass fraction is 85%) 16%; Ammonium bifluoride (NH 4 HF 2 Mass fraction is 98%) 3%, carboxyethylthiosuccinic acid (CETSA mass fraction is 70%) 2%; Fatty acid methyl ester ethoxylate sulfonate 0.5%; Ammonia (the mass fraction of ammonia is 20% ) 2%; the balance is desalted water (conductivity≤10us / cm).

[0057] A preparation method for a cleaning composition for a reverse osmosis membrane, comprising the steps of:

[0058] A. After mixing ammonium bifluoride and desalinated water, ammonium bifluoride solution is obtained;

[0059] B. Add industrial hydrochloric acid, industrial phosphoric acid, carboxyethylthiosuccinic acid, and fatty acid methyl ester ethoxylate sulfonate successively into the ammonium bifluoride solution and mix until the solution...

Embodiment 2

[0063] A kind of cleaning composition for reverse osmosis membrane, is made up of the component of following percentage by weight: Industrial hydrochloric acid (HCl mass fraction is 30%) 10%; Industrial phosphoric acid (H 3 PO 4 Mass fraction is 85%) 10%; Ammonium bifluoride (NH 4 HF 2 Mass fraction is 98%) 2%; Carboxyethylthiosuccinic acid (CETSA mass fraction is 70%) 2%; Fatty acid methyl ester ethoxylate sulfonate 0.5%; Ammonia (the mass fraction of ammonia is 20% ) 1%; the balance is desalted water (conductivity ≤ 10us / cm).

[0064] A preparation method for a cleaning composition for a reverse osmosis membrane, comprising the steps of:

[0065] A. After mixing ammonium bifluoride and desalinated water, ammonium bifluoride solution is obtained;

[0066] B. Add industrial hydrochloric acid, industrial phosphoric acid, carboxyethylthiosuccinic acid, and fatty acid methyl ester ethoxylate sulfonate successively into the ammonium bifluoride solution and mix until the soluti...

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Abstract

The invention belongs to the technical field of cleaning of reverse osmosis membranes and discloses a cleaning composition for a reverse osmosis membrane and a preparation method of the cleaning composition. The composition is prepared from the following components in percentage by weight: 3 to 6 percent of HCl, 8.5 to 17 percent of H3PO4, 1.96 to 3.92 percent of NH4HF2, 1.4 to 5.6 percent of carboxyethyl thiodisuccinic acid, 0.5 to 1.0 percent of fatty acid methyl ester ethoxylate sulfonate, proper amount of a pH modifier enabling the pH of the composition to be 2 or above and the balance ofdemineralized water. The preparation method comprises the following steps: A, uniformly mixing the NH4HF2 with the demineralized water to obtain an NH4HF2 solution; B, sequentially adding the HCl, theH3PO4, the carboxyethyl thiodisuccinic acid and the fatty acid methyl ester ethoxylate sulfonate into the NH4HF2 solution and uniformly mixing until the solution is clear to obtain a clear solution;C, uniformly mixing the clear solution with NH3 and curing to obtain a cleaning agent. The cleaning composition for the reverse osmosis membrane disclosed by the invention has the characteristics of good cleaning effect, less foam and easiness in flushing.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membrane cleaning, and in particular relates to a cleaning composition for reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics made by simulating biological semipermeable membrane, and is the core component of reverse osmosis technology. The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process, and easy o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06
CPCB01D65/02B01D2321/168
Inventor 余明宇
Owner CHENGDU WANCHAO SURFACE TECH CO LTD
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