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Dual-purpose film cleaning agent and its preparation method and use

A membrane cleaning agent and cleaning agent technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane performance degradation, low cleaning efficiency, and alkali corrosion of membrane elements.

Active Publication Date: 2015-01-07
XIAMEN ZHENGCHENG MEMBRANE CLEANING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After membrane fouling, when cleaning with alkaline cleaning agent, in most cases, it still stays in the single-component substance of sodium hydroxide for cleaning, and rarely uses compound surfactants and other additives. Cleaning with membrane cleaning agent, the cleaning efficiency is low, and it only relies on alkalinity to remove organic pollutants on the surface of the membrane. When the cleaning effect is poor, the cleaning ability can only be improved by increasing the alkalinity and temperature. At the same time that the pollutants are removed, the membrane element is severely corroded by alkali, and the performance of the membrane is attenuated; when removing the inorganic matter on the membrane, it is necessary to use an acidic cleaning agent, and currently used are hydrochloric acid, citric acid and other inorganic or organic acids , without adding any other ingredients to help penetration and cleaning, so the acid cleaning is completely dependent on the acid and pollution reaction of the cleaning agent, and the pollutants are reacted layer by layer from the membrane, which is inefficient

Method used

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  • Dual-purpose film cleaning agent and its preparation method and use
  • Dual-purpose film cleaning agent and its preparation method and use
  • Dual-purpose film cleaning agent and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: a kind of dual-purpose film cleaning agent is made up of following components by mass ratio:

[0029]

[0030] Take each component according to the above ratio, grind, sieve, stir, and mix for more than 1 hour until uniform. When the concentration of its aqueous solution is 1%, the pH value is 8.50.

[0031] An industrial chemical plant in Minxi, Fujian Province extracted surface water, and after being treated with sand filter activated carbon, it entered the RO system to prepare pure water. The RO membrane core was cleaned after half a year of use. The pollution of the membrane was a mixture of organic pollution and inorganic pollution.

[0032] The reference formula is the cleaning formula recommended by membrane element suppliers represented by Dow Chemical and Hyde Energy of the United States—alkaline: NaOH+sodium dodecyl sulfonate (Na-SDS), acidic: HCl, see Dow’s reaction Osmosis and Nanofiltration Membrane Element Product and Technical Manual and ...

Embodiment 2

[0043]

[0044] A biological product company in Jiangxi has two sets of membrane concentration equipment of different sizes for filtration, using nanofiltration membranes to jointly concentrate the filtrate of a biological fermentation liquid ultrafiltration. Use ordinary acid-base cleaning agents to clean alternately, the acid is nitric acid, and the alkali is a commercially available cleaning agent.

[0045] Compared with the method, the cleaning method is to wash once a day, the common acid-base cleaning agent of the traditional method is used for large equipment, and the cleaning agent of Example 2 is used for small equipment.

[0046]

[0047] After 4 months of operation, the membrane cores of large equipment have been scrapped and cannot be used, and a batch of membrane cores have been replaced (the membrane cores of large equipment use the original cleaning method to replace the cycle of about 4-5 months), while the membrane cores of small equipment Continue runni...

Embodiment 3

[0050]

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PUM

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Abstract

The invention discloses a dual-purpose film cleaning agent and its preparation method and use. The dual-purpose film cleaning agent comprises 0.5-10% of alkyl polyoxyethylene ether sodium sulfate, 0.2-8% of alkyl polyoxyethylene ether, 0.1-5% of cocamidopropyl betaine, 2-25% of sodium sulfate, 2-25% of EDTA-2Na, 0.1-15% of mixed sodium sulfate, 0.1-15% of sodium gluconate, 0.1-5% of sodium carboxymethylcellulose, 0.1-5% of sodium polyacrylate, 1-25% of sodium chloride, 1-15% of sodium nitrate and 5-25% of sodium citrate. The preparation method comprises the following steps of weighing the above components according to the above ratio, carrying out crushing, carrying out sieving, and carrying out stirring mixing for more than 1h until the mixture is uniform. The dual-purpose film cleaning agent can produce cleaning effects or synergetic cleaning effects under alkaline conditions and acidic conditions.

Description

technical field [0001] The invention discloses a dual-purpose membrane cleaning agent, belongs to the technical field of membrane separation systems for water treatment according to the International Patent Classification (IPC), and in particular relates to a cleaning agent after membrane pollution and its application. Background technique [0002] As a brand-new industrial separation unit, membrane separation technology has penetrated into pharmaceutical, food, chemical, petrochemical, electric power, seawater desalination, reclaimed water reuse and other fields, and even water purifiers and water purifiers for household use. In the filtration process of industrial production, the membrane plays the role of separation and interception. In this process, the large particles, colloidal substances, and macromolecular substances in the material solution are separated from the permeated aqueous solution due to the barrier effect of the membrane; Membranes have the effect of retai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/06
Inventor 吴章锋
Owner XIAMEN ZHENGCHENG MEMBRANE CLEANING TECH