Scale preventing agent for reverse osmosis membrane and scale preventing method

A reverse osmosis membrane and antiscalant technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as formation

Inactive Publication Date: 2013-12-25
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in recent years, in order to effectively utilize water resources, the use of RO membranes to recycle wastewater has increased. However, when water containing phosphoric acid is recovered, calcium phosphate scales may be formed on the RO membranes.

Method used

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  • Scale preventing agent for reverse osmosis membrane and scale preventing method
  • Scale preventing agent for reverse osmosis membrane and scale preventing method
  • Scale preventing agent for reverse osmosis membrane and scale preventing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0038] First, the scale inhibitor according to the first embodiment of the present invention will be described. The antiscalant of this embodiment suppresses the precipitation of calcium phosphate scale produced in the reverse osmosis membrane treatment, prevents scale from adhering to the RO membrane, etc., and its main component is a unit derived from (meth)acrylic acid and derived from 2- A water-soluble copolymer of (meth)acrylamido-2-methylpropanesulfonic acid constituent units.

[0039]Specifically, the water-soluble copolymer as the main component of the scale inhibitor of this embodiment is a copolymer of (meth)acrylic acid and 2-(meth)acrylamido-2-methylpropanesulfonic acid, or Copolymers with other monomers. Here, "(meth)acrylic acid" means methacrylic acid, acrylic acid, or salts thereof, and these monomers may be used alone or in combination of two or more. In addition, "2-(meth)acrylamido-2-methylpropanesulfonic acid" means 2-methacrylamido-2-methylpropanesulfon...

no. 2 approach

[0057] Next, the scale inhibition method according to the second embodiment of the present invention will be described. The scale inhibition method of the present embodiment is a method of suppressing precipitation of calcium phosphate scale in reverse osmosis membrane treatment using the scale inhibitor of the first embodiment. That is, in the scale inhibition method of this embodiment, a scale inhibitor mainly composed of a water-soluble copolymer having (meth)acrylic acid-derived scale inhibitor is added to the reverse osmosis membrane treatment water system. Units and constituent units derived from 2-(meth)acrylamido-2-methylpropanesulfonic acid, units derived from 2-(meth)acrylamido-2-methylpropanesulfonic acid are 10 to 40 mol %, and the mass average molecular weight is 1×10 4 ~5×10 4 .

[0058] In the scale inhibition method of this embodiment, there is no particular limitation on the method of adding the scale inhibitor, and it can be added at the site where scale a...

Embodiment

[0067] Hereinafter, the effects of the present invention will be described concretely with reference to Examples and Comparative Examples of the present invention. In this example, the performance of the scale inhibitors of Examples 1 to 3 within the scope of the present invention and the scale inhibitors of Comparative Examples 1 to 4 outside the scope of the present invention was evaluated by the method shown below. The specific data of the scale inhibitors of Examples 1-3 are shown in following Table 1, and the specific data of the scale inhibitors of Comparative Examples 1-4 are shown in following Table 2. In addition, in the respective monomers shown in Table 1 and Table 2 below, AA is acrylic acid, and AMPS is 2-acrylamido-2-methylpropanesulfonic acid.

[0068] [Table 1]

[0069]

[0070] [Table 2]

[0071]

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Abstract

Provided are a scale preventing agent for reverse osmosis membranes and a scale preventing method that can prevent attachment of calcium phosphate scale arising in reverse osmosis membrane processing without increasing the phosphorus concentration in discharged water and which does not give rise to fine sludge such as gelated materials. To a reverse osmosis membrane processing system is added a scale preventing agent having a unit derived from a (methyl)acrylate and a structural unit derived from 2-(methyl)acrylamide-2-methylpropanesulfonic acid. The unit derived from 2-(methyl)acrylamide-2-methylpropanesulfonic acid is 10-40 mol%, and the main component of the scale preventing agent is a water-soluble copolymer having a mass average molecular weight of 1*10<4>-5*10<4>.

Description

technical field [0001] The invention relates to a scale inhibitor for a reverse osmosis membrane and a scale inhibitor method. More specifically, it relates to a scale inhibitor and a scale inhibitor method for preventing the adhesion of calcium carbonate scale generated in membrane treatment. Background technique [0002] In cooling water systems, boiler water systems, membrane treatment or injection wells of geothermal power plants, scale can form on heat transfer surfaces, piping or membrane surfaces that come into contact with water. Especially when high-concentration operation is carried out from the viewpoint of resource conservation and energy saving, or when the recovery rate is improved in the case of using a membrane, the dissolved salts in the water are concentrated to form insoluble salts, resulting in scale generation. [0003] Further, for example, the scale generated in the heat exchange part causes heat transfer disturbance, the scale attached to the piping ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/00B01D61/02C02F1/44C02F5/10C02F5/12
CPCB01D61/025B01D65/08B01D2321/168C02F1/441C02F5/10C02F5/12C02F2303/22C23F14/02
Inventor 西田育子木幡贤二
Owner KURITA WATER INDUSTRIES LTD
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