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Reverse osmosis membrane cleaner, cleaning solution, and cleaning method

A technology of reverse osmosis membrane and cleaning agent, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve effective cleaning effect

Inactive Publication Date: 2018-01-02
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the past, as described in Non-Patent Document 1, there were reports on detergent components used to improve the cleaning effect of RO membranes, but no investigation was conducted to suppress the reduction in the rejection rate of RO membranes caused by cleaning, that is, no investigation was made on Discussion on the composition of cleaning agent for RO membrane protection

Method used

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  • Reverse osmosis membrane cleaner, cleaning solution, and cleaning method
  • Reverse osmosis membrane cleaner, cleaning solution, and cleaning method
  • Reverse osmosis membrane cleaner, cleaning solution, and cleaning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] Examples and comparative examples are given below to describe the present invention more specifically.

[0101] Among the reagents used in the following experiments I-IV, sodium chloride, sodium metasilicate 9 hydrate (for silica solution preparation), hydrochloric acid, isopropanol (IPA), various amino acids, hydroxide The sodium was all from Wako Pure Chemical Industries. Aspartame was from Ajinomoto Health Supply. ε-polylysine (molecular weight 4000-5000) was from JNC Company.

[0102] Sodium dodecylbenzenesulfonate was from Wako Pure Chemical Industries. Monochlorosulfamic acid was synthesized by using sulfamic acid (Wako Pure Chemical Industries, Ltd.), sodium hypochlorite (Asahi Glass Co., Ltd.), and sodium hydroxide by the method described in the section .

[0103] In the following experiments, it is preferable to suppress the increase of the flux of pure water without reducing the rejection rate in the immersion experiment of the cleaning solution. That is, ...

Embodiment I-1

[0136] The cleaning agent (4) was diluted 10 times with pure water to prepare a sodium hydroxide aqueous solution containing 2% by weight of arginine at pH 12, which was used as a cleaning solution, and the above experiment was carried out.

Embodiment I-2

[0138] The cleaning agent (5) was diluted 10 times with pure water to prepare an aqueous sodium hydroxide solution containing 2% by weight of aspartame at pH 12, which was used as a cleaning solution, and the above experiment was carried out.

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PUM

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Abstract

Provided is a cleaner having the effect of minimizing the decline in the blocking rate of an RO membrane due to cleaning, the cleaner including a basic or hydrophobic amino acid, a peptide including these amino acids as constituent amino acids, or a derivative thereof as a protective agent of the membrane. The cleaner may additionally include one or more agents selected from the group consisting of alkali agents, combined chlorine agents, and oxidants. The amino acid is preferably arginine, lysine, or phenyl alanine. Also provided is a cleaning solution comprising a diluted aqueous solution ofthe cleaner. Also provided is a method for cleaning an RO membrane, using this cleaning solution.

Description

technical field [0001] The present invention relates to a cleaning agent and a cleaning solution for restoring the performance of reverse osmosis (RO) membranes used in the field of water treatment when they are polluted by organic or inorganic substances and the performance of water flux or desalination rate, etc., is reduced. And the cleaning solution has the effect of suppressing the decrease in the rejection rate of the membrane that is caused by cleaning. Moreover, this invention also relates to the cleaning method of the RO membrane using this cleaning liquid. Background technique [0002] The separation and purification process based on the RO membrane system is more energy-efficient than the system using evaporation or electrodialysis, and is widely used in the desalination of seawater and salt water, or the manufacture of industrial water and ultrapure water, and waste water recycling. [0003] Since the performance of the RO membrane will be reduced when it is pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/06B01D71/56C11D7/32C11D17/08
CPCB01D65/06B01D71/56Y02A20/131B01D2321/166B01D2321/168B01D61/10B01D61/025C11D7/3245C11D7/32B01D2321/162B01D65/02C11D17/0008C11D17/08C11D7/06
Inventor 川胜孝博
Owner KURITA WATER INDUSTRIES LTD
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