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Cleaning fluid, detergent, and cleaning method for water-contact member

A washing liquid and water contact technology, applied in chemical instruments and methods, inorganic non-surface-active washing compositions, liquid soaps, etc., can solve the unrecorded use of detergents that selectively permeate membranes, etc., and achieve excellent bactericidal effects , High washing effect

Active Publication Date: 2019-09-17
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Document 2 does not describe the use of detergents that selectively permeate membranes

Method used

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  • Cleaning fluid, detergent, and cleaning method for water-contact member
  • Cleaning fluid, detergent, and cleaning method for water-contact member
  • Cleaning fluid, detergent, and cleaning method for water-contact member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0092] ※Example 2 (molar concentration of sulfamic acid: Cl 2 Molar concentration = 0.009:0.017)

Embodiment 3

[0093] Embodiment 3 (sulfamic acid molar concentration: Cl 2 Molarity = 0.004:0.017)

Embodiment 4

[0094] Embodiment 4 (sulfamic acid molar concentration: Cl 2 Molar concentration = 0.015:0.017)

[0095] [investigation]

[0096] Examples 2 to 4 showed the same immediate effect as the sodium hypochlorite of Comparative Example 5, and also showed a lower inter-membrane pressure difference (higher cleaning effect) than the sodium hypochlorite in the final reaching differential pressure.

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PUM

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Abstract

A cleaning fluid and a detergent for water-contact members which both contain free chlorine and a combined-chlorine compound are disclosed, wherein the molar ratio of the total chlorine (Cl2) to the nitrogen atoms N derived from the combined-chlorine compound, Cl2 / N, is 1 or higher, the cleaning fluid having a pH of 9 or higher and the detergent having a pH of 12 or higher. The cleaning fluid can be prepared by diluting the detergent with water. Also provided is a cleaning method for water-contact members, the method comprising using the cleaning fluid to clean a water-contact member.

Description

technical field [0001] The present invention relates to a washing solution, detergent and washing method for washing water-contact members such as UF membrane (ultrafiltration membrane), MF membrane (microfiltration membrane), filter, piping, pressure gauge, and flowmeter. Background technique [0002] In the membrane separation device (turbidity removal membrane device) using UF membrane and MF membrane, the separation membrane will adhere to dirt, so the cleaning fluid (water and / or gas) is generally supplied intermittently every 30 seconds to 60 minutes for physical cleaning of the membrane. washing. [0003] Since the dirt that cannot be removed even with this physical washing is deposited on the membrane, the filtration capacity of the membrane gradually decreases. [0004] Therefore, in the turbidity removal membrane device, it is necessary to use medicines regularly or irregularly for medicine washing. [0005] In Patent Document 1, it is described that a membrane t...

Claims

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Application Information

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IPC IPC(8): B01D65/06C11D7/08C11D7/10C11D17/08
CPCB01D65/06C11D7/08C11D7/10C11D17/08
Inventor 岩见贵子川胜孝博田中爱理
Owner KURITA WATER INDUSTRIES LTD
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