JP4923664B2 - Scale adhesion inhibitor and cooling water treatment method - Google Patents
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本発明はスケール付着防止剤及び冷却水系の処理方法に係り、特に水中に懸濁物質の存在する冷却水系のスケール障害を防止するためのスケール付着防止剤と、このスケール付着防止剤を用いた冷却水系の処理方法に関する。 The present invention relates to a scale adhesion preventing agent and a method for treating a cooling water system, and in particular, a scale adhesion preventing agent for preventing a scale failure in a cooling water system in which suspended substances exist in water, and cooling using the scale adhesion preventing agent. The present invention relates to an aqueous processing method.
冷却水中に懸濁物質が含まれると、懸濁物質に起因したスケールの付着により、冷却水系の安定運転が阻害される。このようなスケールは、状況に応じて変化するが、カルシウム、マグネシウム、シリカ、アルミニウム、鉄、強熱減量、無水炭酸などを含む様々な成分より構成される。 When the suspended water is contained in the cooling water, the stable operation of the cooling water system is hindered due to the adhesion of the scale caused by the suspended material. Such scales vary depending on the situation, but are composed of various components including calcium, magnesium, silica, aluminum, iron, ignition loss, anhydrous carbonic acid and the like.
従来、このようなスケールの防止技術として、冷却水に各種のスケール付着防止剤を添加することが行われており、例えば、特許第３０５５８１５号公報には下記１〜４のいずれか一つを水系に添加するシリカスケールの防止方法が記載されている。
１．（メタ）アクリル酸と、（メタ）アクリルアミドメチルプロパンスルホン酸と、置換（メタ）アクリルアミドとの共重合体
２．１の共重合体と、アルミニウムイオン又はマグネシウムイオンとの混合物
３．ポリアクリル酸（塩）又はポリマレイン酸（塩）と、アルミニウムイオン又はマグネシウムイオンとの混合物
４．マグネシウムイオン
1. 2. A mixture of a copolymer 2.1 of (meth) acrylic acid, (meth) acrylamidomethylpropanesulfonic acid and substituted (meth) acrylamide, and aluminum ions or magnesium ions. 3. Mixture of polyacrylic acid (salt) or polymaleic acid (salt) and aluminum ion or magnesium ion Magnesium ion
しかしながら、特許第３０５５８１５号公報に記載される添加剤のみでは、十分なスケール防止効果は得られず、その改良が望まれる。 However, the additive described in Japanese Patent No. 3055815 alone does not provide a sufficient scale prevention effect, and its improvement is desired.
従って、本発明は、水中に懸濁物質が存在する冷却水系において、懸濁物質に起因したスケールの付着を効果的に抑制するためのスケール付着防止剤と、このスケール付着防止剤を用いた冷却水系の処理方法を提供することを目的とする。 Accordingly, the present invention provides a scale adhesion preventive agent for effectively suppressing the adhesion of scale due to suspended substances in a cooling water system in which suspended substances exist in water, and cooling using the scale adhesion preventive agent. An object is to provide an aqueous treatment method.
本発明（請求項１）のスケール付着防止剤は、マレイン酸及び／又はマレイン酸の水溶性塩の重合体（以下「重合体Ａ」と称す。）と、（メタ）アクリル酸及びこれらの水溶性塩よりなる群から選ばれる単量体成分（以下「単量体成分ｂ１」と称す。）の１種又は２種以上とモノエチレン性不飽和スルホン酸単量体から選ばれる単量体成分（以下「単量体成分ｂ２」と称す。）の１種又は２種以の重量性塩から選ばれる１種以上とイソブチレンとの共重合体（以下「重合体Ｃ」と称す。）とを含むことを特徴とするスケール付着防止剤であることを特徴とする。 The scale adhesion preventing agent of the present invention (Claim 1) includes maleic acid and / or a polymer of a water-soluble salt of maleic acid (hereinafter referred to as “polymer A”), (meth) acrylic acid, and water-soluble thereof. Monomer component selected from the group consisting of functional salts (hereinafter referred to as “monomer component b1”) and one or more monomer components selected from monoethylenically unsaturated sulfonic acid monomers (Hereinafter referred to as “monomer component b2”) and a copolymer of isobutylene and one or more selected from one or more weight salts (hereinafter referred to as “polymer C”). It is a scale adhesion preventing agent characterized by containing.
請求項２のスケール付着防止剤は、請求項１において、重合体Ａと重合体Ｂと重合体Ｃとを固形分濃度比で重合体Ａ：重合体Ｂ：重合体Ｃ＝１〜９：１〜４：０．１〜１０の割合で含むことを特徴とする。 The scale adhesion preventive agent according to claim 2 is the polymer A, polymer B, and polymer C in the solid content concentration ratio of polymer A, polymer B, and polymer C according to claim 1, wherein polymer A: polymer B: polymer C = 1-9: 1. -4: It contains by the ratio of 0.1-10, It is characterized by the above-mentioned.
請求項３のスケール付着防止剤は、請求項１又は２において、単量体成分ｂ２が２−アクリルアミド−２−メチルプロパンスルホン酸であることを特徴とする。 The scale adhesion inhibitor according to claim 3 is characterized in that, in claim 1 or 2, the monomer component b2 is 2-acrylamido-2-methylpropanesulfonic acid.
請求項４のスケール付着防止剤は、請求項１ないし３のいずれか１項において、単量体成分ｂ３がＮ−ｔｅｒｔ−ブチルアクリルアミドであることを特徴とする。 A scale adhesion inhibitor according to claim 4 is characterized in that the monomer component b3 is N-tert-butylacrylamide in any one of claims 1 to 3.
本発明（請求項５）の冷却水系の処理方法は、水中に懸濁物質が存在する冷却水系におけるスケールの付着を抑制する冷却水系の処理方法において、該冷却水系に、マレイン酸及び／又はマレイン酸の水溶性塩の重合体（以下「重合体Ａ」と称す。）と、（メタ）アクリル酸及びこれらの水溶性塩よりなる群から選ばれる単量体成分（以下「単量体成分ｂ１」と称す。）の１種又は２種以上とモノエチレン性不飽和スルホン酸単量体から選ばれる単量体成分（以下「単量体成分ｂ２」と称す。）の１種又は２種以上と（メタ）アクリルアミド及び置換(メタ)アクリルアミドよりなる群から選ばれる単量体成分（以下「単量体成分ｂ３」と称す。）の１種又は２種以上との共重合体（以下「重合体Ｂ」と称す。）と、マレイン酸及び／又はマレイン酸の水溶性塩から選ばれる１種以上とイソブチレンとの共重合体（以下「重合体Ｃ」と称す。）を含むスケール付着防止剤とを添加することを特徴とする。 The cooling water system treatment method of the present invention (Claim 5) is a cooling water system treatment method that suppresses the adhesion of scale in a cooling water system in which suspended substances exist in water, and the cooling water system contains maleic acid and / or maleic acid. A polymer of a water-soluble salt of an acid (hereinafter referred to as “polymer A”), a monomer component selected from the group consisting of (meth) acrylic acid and a water-soluble salt thereof (hereinafter “monomer component b1”). 1 type or 2 types or more and a monomer component selected from monoethylenically unsaturated sulfonic acid monomers (hereinafter referred to as “monomer component b2”). And a copolymer (hereinafter “heavy”) of one or more monomer components selected from the group consisting of (meth) acrylamide and substituted (meth) acrylamide (hereinafter referred to as “monomer component b3”). ”And maleic acid and / or male. Copolymers of one or more isobutylene selected from water-soluble salts of phosphate (hereinafter referred to as "polymer C".), Wherein the addition of the scale preventive agent comprising a.
請求項６の冷却水系の処理方法は、請求項５において、重合体Ａと重合体Ｂと重合体Ｃとを固形分濃度比で重合体Ａ：重合体Ｂ：重合体Ｃ＝１〜９：１〜４：０．１〜１０の割合で前記冷却水系に添加することを特徴とする。 The cooling water treatment method according to claim 6 is the method according to claim 5, wherein the polymer A, the polymer B, and the polymer C are polymer A: polymer B: polymer C = 1-9 in a solid content concentration ratio. It adds to the said cooling water system in the ratio of 1-4: 0.1-10, It is characterized by the above-mentioned.
請求項７の冷却水系の処理方法は、請求項５又は６において、単量体成分ｂ２が２−アクリルアミド−２−メチルプロパンスルホン酸であることを特徴とする。 The cooling water processing method according to claim 7 is characterized in that, in claim 5 or 6, the monomer component b2 is 2-acrylamido-2-methylpropanesulfonic acid.
請求項８の冷却水系の処理方法は、請求項５ないし７のいずれか１項において、単量体成分ｂ３がＮ−ｔｅｒｔ−ブチルアクリルアミドであることを特徴とする。 The cooling water treatment method according to claim 8 is characterized in that in any one of claims 5 to 7, the monomer component b3 is N-tert-butylacrylamide.
本発明によれば、３種類の重合体、即ち、懸濁物質の影響がない状態においてスケールの付着を抑制する成分である重合体Ａと、懸濁物質起因のスケールの付着を抑制する成分である重合体Ｂと重合体Ｃとを併用することで、懸濁物質の影響の有無に拘わらず、スケールの付着を効果的に抑制し、冷却水系の安定的な運転に寄与することができる。 According to the present invention, three types of polymers, that is, a polymer A that is a component that suppresses the adhesion of scale in a state where there is no influence of the suspended substance, and a component that suppresses the adhesion of scale caused by the suspended substance. By using a certain polymer B and polymer C in combination, it is possible to effectively suppress the adhesion of scale regardless of the presence or absence of the influence of suspended substances and contribute to the stable operation of the cooling water system.
以下に本発明のスケール付着防止剤及び冷却水系の処理方法についての実施の形態を詳細に説明する。 Embodiments of the scale adhesion inhibitor and the cooling water processing method of the present invention will be described in detail below.
なお、本発明において、「（メタ）アクリル」とは「アクリル」と「メタクリル」の両方を指す。また、「分子量」とは「重量平均分子量」を指す。
［重合体Ａ］
重合体Ａは、懸濁物質の影響がない状態においてスケールの付着を抑制する成分であり、マレイン酸及び／又はマレイン酸の水溶性塩の重合体よりなる。
In the present invention, “(meth) acryl” refers to both “acryl” and “methacryl”. “Molecular weight” refers to “weight average molecular weight”.
[Polymer A]
The polymer A is a component that suppresses the adhesion of scales in a state where there is no influence of suspended substances, and is made of a polymer of maleic acid and / or a water-soluble salt of maleic acid.
ここで、マレイン酸の水溶性塩としては、マレイン酸ナトリウム、マレイン酸カリウム、マレイン酸アンモニウム等が挙げられる。 Here, examples of the water-soluble salt of maleic acid include sodium maleate, potassium maleate, and ammonium maleate.
重合体Ａの分子量としては、３００〜５０００、特に５００〜１５００の範囲であることが好ましい。
［重合体Ｂ］
重合体Ｂは、懸濁物質起因のスケールの付着を抑制する成分であり、（メタ）アクリル酸及びこれらの水溶性塩よりなる群から選ばれる単量体成分（以下「単量体成分ｂ１」と称す。）の１種又は２種以上と、モノエチレン性不飽和スルホン酸単量体から選ばれる単量体成分（以下「単量体成分ｂ２」と称す。）の１種又は２種以上と、（メタ）アクリルアミド及び置換（メタ）アクリルアミドよりなる群から選ばれる単量体成分（以下「単量体成分ｂ３」と称す。）の１種又は２種以上との共重合体よりなる。
＜単量体成分ｂ１＞
単量体成分ｂ１の（メタ）アクリル酸の水溶性塩としては、（メタ）アクリル酸のナトリウム塩、カリウム塩、アンモニウム塩等が挙げられる。
＜単量体成分ｂ２＞
単量体成分ｂ２のモノエチレン性不飽和スルホン酸単量体としては、（メタ）アクリルアミドメチルプロパンスルホン酸が好ましく、特に下記一般式（１）で表されるものが好ましく、とりわけ２−アクリルアミド−２−メチルプロパンスルホン酸が好ましい。
The molecular weight of the polymer A is preferably in the range of 300 to 5000, particularly 500 to 1500.
[Polymer B]
The polymer B is a component that suppresses the adhesion of the scale caused by the suspended substance, and is a monomer component selected from the group consisting of (meth) acrylic acid and water-soluble salts thereof (hereinafter “monomer component b1”). 1 type or 2 types or more and a monomer component selected from monoethylenically unsaturated sulfonic acid monomers (hereinafter referred to as “monomer component b2”). And a copolymer of one or more monomer components selected from the group consisting of (meth) acrylamide and substituted (meth) acrylamide (hereinafter referred to as “monomer component b3”).
<Monomer component b1>
Examples of the water-soluble salt of (meth) acrylic acid as the monomer component b1 include sodium salt, potassium salt and ammonium salt of (meth) acrylic acid.
<Monomer component b2>
As the monoethylenically unsaturated sulfonic acid monomer of the monomer component b2, (meth) acrylamidomethylpropanesulfonic acid is preferable, and those represented by the following general formula (1) are particularly preferable. 2-methylpropanesulfonic acid is preferred.
＜単量体成分ｂ３＞
単量体成分ｂ３の置換（メタ）アクリルアミドとしては、下記一般式（２）で表されるものが好ましく、特にＮ−ｔｅｒｔ−ブチルアクリルアミドが好ましい。
<Monomer component b3>
As substituted (meth) acrylamide of monomer component b3, what is represented by following General formula (2) is preferable, and N-tert- butylacrylamide is especially preferable.
＜単量体成分比＞
重合体Ｂ中の各単量体成分の含有割合は、モル％で
単量体成分ｂ１：単量体成分ｂ２：単量体成分ｂ３＝３０〜９２：５〜４０：３〜３０
特に
単量体成分ｂ１：単量体成分ｂ２：単量体成分ｂ３＝５０〜９０：７〜２０：３〜３０
であることが好ましい。
＜分子量＞
重合体Ｂの分子量としては、１０００〜２５０００、特に２０００〜１２０００の範囲であることが好ましい。
［固形分濃度比］
重合体Ａと重合体Ｂと重合体Ｃとは、固形分濃度比が重合体Ａ：重合体Ｂ:重合体Ｃ＝１〜９：１〜４：０．１〜１０となるように処理対象水系に添加することが好ましい。
<Monomer component ratio>
The content ratio of each monomer component in the polymer B is mol%. Monomer component b1: Monomer component b2: Monomer component b3 = 30 to 92: 5 to 40: 3 to 30
In particular, monomer component b1: monomer component b2: monomer component b3 = 50 to 90: 7 to 20: 3 to 30
It is preferable that
<Molecular weight>
The molecular weight of the polymer B is preferably in the range of 1000 to 25000, particularly 2000 to 12000.
[Solid content concentration ratio]
Polymer A, Polymer B, and Polymer C are to be processed so that the solid content concentration ratio is Polymer A: Polymer B: Polymer C = 1 to 9: 1 to 4: 0.1 to 10. It is preferable to add to an aqueous system.
重合体Ａの使用割合が上記範囲よりも多く重合体Ｂが少ないと懸濁物質の影響を大きく受ける可能性があり、逆に、重合体Ｂが多く、重合体Ａが少ないと水質によっては炭酸カルシウムスケールが析出する懸念がある。 When the proportion of the polymer A used is larger than the above range and the polymer B is small, there is a possibility that it is greatly affected by the suspended matter. Conversely, when the polymer B is large and the polymer A is small, depending on the water quality, There is a concern that calcium scale is deposited.
従って、重合体Ａと重合体Ｂと重合体Ｃとを含む本発明のスケール付着防止剤は重合体Ａと重合体Ｂと重合体Ｃとを上記範囲で含むことが好ましい。 Therefore, it is preferable that the scale adhesion preventing agent of the present invention including the polymer A, the polymer B, and the polymer C includes the polymer A, the polymer B, and the polymer C in the above range.
なお、本発明のスケール付着防止剤は、重合体Ａと重合体Ｂと重合体Ｃとが予め混合されたものであっても良く、２種の重合体が予め混合され、残りの１種が別途混合されても良く、又各々別々に添加されて系内で混合されるものであっても良い。
［添加濃度及び添加方法］
重合体Ａ、重合体Ｂ及び重合体Ｃの添加濃度は、処理対象水系の水質や運転状況などを考慮して、十分なスケール抑制効果が得られるような濃度に設定されるが、通常、処理対象水系中の保持濃度（固形分換算濃度）で、重合体Ａと重合体Ｂ及び重合体Ｃの合計濃度として１〜５００ｍｇ／Ｌ、特に５〜１００ｍｇ／Ｌとなるように添加するのが望ましい。
In addition, the scale adhesion preventing agent of the present invention may be a polymer A, a polymer B, and a polymer C that are mixed in advance, two types of polymers are mixed in advance, and the remaining one is They may be mixed separately, or may be added separately and mixed in the system.
[Addition concentration and addition method]
The addition concentration of the polymer A, the polymer B, and the polymer C is set to such a concentration that a sufficient scale suppression effect can be obtained in consideration of the water quality of the water system to be treated and the operation status. It is desirable to add so that the total concentration of the polymer A, the polymer B, and the polymer C is 1 to 500 mg / L, particularly 5 to 100 mg / L, in the retention concentration (concentration in solid content) in the target aqueous system. .
重合体Ａと重合体Ｂ及び重合体Ｃは、その固形分濃度比及び添加濃度が上記好適範囲内となるように個別に添加しても良く、予め重合体Ａと重合体Ｂ及び重合体Ｃとを所定の比率で混合したものを添加しても良い。重合体Ａと重合体Ｂと重合体Ｃとを個別に添加する場合、これらを同一箇所で添加しても異なる箇所で添加しても良い。 The polymer A, the polymer B, and the polymer C may be added individually so that the solid content concentration ratio and the addition concentration are within the above-mentioned preferable ranges. The polymer A, the polymer B, and the polymer C are previously included. May be added at a predetermined ratio. When polymer A, polymer B, and polymer C are added individually, they may be added at the same location or at different locations.
なお、本発明においては、重合体Ａと重合体Ｂ及び重合体Ｃとを処理対象水系に添加した際に得られる各処理効率を妨げない範囲において、他の腐食抑制剤、スケール抑制剤、分散剤、スライムコントロール剤、剥離剤、消泡剤などを併用しても良く、濾過器などの各種水処理機器との併用も可能である。例えば、水系内に銅材質を含む場合には、ベンゾトリアゾールやトリルトリアゾールなどのアゾール類誘導体を併用すれば、銅材質に対する防食性能を向上させることができる。 In the present invention, other corrosion inhibitors, scale inhibitors, dispersions, as long as each treatment efficiency obtained when the polymer A, the polymer B, and the polymer C are added to the water system to be treated are not hindered. An agent, a slime control agent, a release agent, an antifoaming agent, and the like may be used in combination, and may be used in combination with various water treatment devices such as a filter. For example, when a copper material is included in the aqueous system, the anticorrosion performance for the copper material can be improved by using an azole derivative such as benzotriazole or tolyltriazole in combination.
従って、本発明のスケール付着防止剤は、重合体Ａ及び重合体Ｂ及び重合体Ｃの他に、これらの他の腐食抑制剤、スケール抑制剤、分散剤、スライムコントロール剤、剥離剤、消泡剤などを含むものであっても良い。
［処理対象水系］
本発明の処理対象水系としては、水中に懸濁物質が存在する冷却水系が挙げられ、例えば、工業用水を補給水とする開放循環冷却水系等が挙げられる。
Therefore, in addition to the polymer A, the polymer B, and the polymer C, the scale adhesion preventing agent of the present invention includes these other corrosion inhibitors, scale inhibitors, dispersants, slime control agents, release agents, antifoaming agents. An agent may be included.
[Treatment target water system]
Examples of the water system to be treated of the present invention include a cooling water system in which suspended substances are present in water, and examples thereof include an open circulation cooling water system using industrial water as makeup water.
このような冷却水系のうち、開放循環冷却水系では、冷却塔のピットへ本発明のスケール付着防止剤を添加すれば良い。 Among such cooling water systems, in the open circulation cooling water system, the scale adhesion preventing agent of the present invention may be added to the pit of the cooling tower.
以下に実施例及び比較例を挙げて本発明をより具体的に説明する。
実施例１〜５、比較例１，２
［スケール付着防止剤］
重合体Ａ、重合体Ｂ及び重合体Ｃとして以下のものを準備した。
＜重合体Ａ＞ ポリマイレン酸
分子量：６００
＜重合体Ｂ＞
アクリル酸と２−アクリルアミド−２−メチルプロパンスルホン酸とＮ−ｔｅｒｔ−ブチルアクリルアミドとの共重合体
アクリル酸：２−アクリルアミド−２−メチルプロパンスルホン酸：Ｎ−ｔｅｒｔ−ブチルアクリルアミド（モル比）＝７７：１２：１１
分子量＝１００００
＜重合体Ｂ＞
マレイン酸とイソブチレンの共重合体
分子量：１４０００
重合体Ａと重合体Ｂ及び重合体Ｃとは、下記の固形分濃度比となるように、また、添加濃度（水系の保持濃度（固形分換算））が重合体Ａと重合体Ｂ及び重合体Ｃとの合計で２０ｍｇ／Ｌとなるように添加した。
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
Examples 1 to 5, Comparative Examples 1 and 2
[Scale adhesion inhibitor]
The following were prepared as the polymer A, the polymer B, and the polymer C.
<Polymer A> Polymaleic acid Molecular weight: 600
<Polymer B>
Copolymer of acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid and N-tert-butylacrylamide Acrylic acid: 2-acrylamido-2-methylpropanesulfonic acid: N-tert-butylacrylamide (molar ratio) = 77:12:11
Molecular weight = 10000
<Polymer B>
Copolymer of maleic acid and isobutylene Molecular weight: 14000
The polymer A, the polymer B, and the polymer C have the following solid content concentration ratio, and the addition concentration (water-based retention concentration (in terms of solid content)) is such that the polymer A, the polymer B, and the weight It added so that it might become 20 mg / L in total with the unification | combination C.
図１に概要を示す冷却水系評価試験装置を用い、スケール防止効果の評価を行った。
Using the cooling water system evaluation test apparatus outlined in FIG. 1, the scale prevention effect was evaluated.
図１の評価試験装置において、試験水は試験水タンク１からポンプ２により評価部５に送給され、再び試験水タンク１に戻る。試験水の流量はバルブ３により調整される。試験水タンク１には、試験水補給タンク７よりポンプ８により試験水が供給される。試験水の供給量は、所定の滞留時間となるよう調整される。試験水の温度は温度調整器６により所定の温度に調整される。４は流量計である。 In the evaluation test apparatus of FIG. 1, the test water is supplied from the test water tank 1 to the evaluation unit 5 by the pump 2 and returns to the test water tank 1 again. The flow rate of the test water is adjusted by the valve 3. Test water is supplied to the test water tank 1 by a pump 8 from a test water supply tank 7. The supply amount of the test water is adjusted to have a predetermined residence time. The temperature of the test water is adjusted to a predetermined temperature by the temperature controller 6. 4 is a flow meter.
図１（ｂ）に示す如く、評価部５はカラム９、評価チューブ１０、ヒーター１１、熱電対１２より構成される。試験水はカラム９内部を評価チューブの外側を流れる。評価チューブ１０の内側にはヒーター１１が挿入されており、ヒーター１１による加熱を行うことで、評価チューブ１０外表面において熱交換器などの伝熱面を模擬している。評価チューブ１０の金属部分には熱電対１２を挿入できるような細孔があり、金属内部の温度（管肉温度）を一定に保つようにヒーター１１の出力が制御される。
［試験水］
試験水（模擬冷却水）の水質は下記表２に示す通りである。この試験水には、工業用水より採取した懸濁物質を試験水の濁度が１０となる量、１日一度試験水タンク７にて添加した。
As shown in FIG. 1B, the evaluation unit 5 includes a column 9, an evaluation tube 10, a heater 11, and a thermocouple 12. The test water flows inside the column 9 outside the evaluation tube. A heater 11 is inserted inside the evaluation tube 10, and heating by the heater 11 simulates a heat transfer surface such as a heat exchanger on the outer surface of the evaluation tube 10. The metal portion of the evaluation tube 10 has pores into which the thermocouple 12 can be inserted, and the output of the heater 11 is controlled so that the temperature inside the metal (tube temperature) is kept constant.
[Test water]
The water quality of the test water (simulated cooling water) is as shown in Table 2 below. Suspended matter collected from industrial water was added to the test water in an amount once every day in the test water tank 7 so that the turbidity of the test water was 10.
運転条件は次の通りである。
＜運転条件＞
保有水量：１００Ｌ
評価部における試験水流速：０．５ｍ／ｓ
滞留時間：１００ｈｒ
試験水温度：３０℃
管肉温度：８０℃
評価時間：３日間
［評価結果］
試験終了後の評価チューブ１０を乾燥させ、付着したスケールを除去し、その重量を測定し、付着物量、チューブ面積、評価時間より付着速度を算出した。
The operating conditions are as follows.
<Operating conditions>
Retained water volume: 100L
Test water flow rate in the evaluation section: 0.5 m / s
Residence time: 100 hr
Test water temperature: 30 ° C
Tube temperature: 80 ° C
Evaluation time: 3 days [Evaluation result]
The evaluation tube 10 after completion of the test was dried, the adhered scale was removed, the weight was measured, and the adhesion rate was calculated from the amount of deposit, the tube area, and the evaluation time.
結果を表３に示す。 The results are shown in Table 3.
１ 試験水タンク
５ 評価部
６ 温度調整器
９ カラム
１０ 評価チューブ
１１ ヒーター
１２ 熱電対
1 Test Water Tank 5 Evaluation Unit 6 Temperature Controller 9 Column 10 Evaluation Tube 11 Heater 12 Thermocouple
Claims (8)
マレイン酸及び／又はマレイン酸の水溶性塩の重合体（以下「重合体Ａ」と称す。）と、（メタ）アクリル酸及びこれらの水溶性塩よりなる群から選ばれる単量体成分（以下「単量体成分ｂ１」と称す。）の１種又は２種以上とモノエチレン性不飽和スルホン酸単量体から選ばれる単量体成分（以下「単量体成分ｂ２」と称す。）の１種又は２種重量「重合体Ｂ」と称す。）と、マレイン酸及び／又はマレイン酸の水溶性塩から選ばれる１種以上とイソブチレンとの共重合体（以下「重合体Ｃ」と称す。）とを含むスケール付着防止剤を添加することを特徴とする冷却水系の処理方法。 In the cooling water system treatment method for suppressing adhesion of scale in a cooling water system in which suspended substances exist in water, the cooling water system includes:
A monomer component selected from the group consisting of maleic acid and / or a polymer of a water-soluble salt of maleic acid (hereinafter referred to as “polymer A”), (meth) acrylic acid and water-soluble salts thereof (hereinafter referred to as “polymer A”) One or more of “monomer component b1”) and a monomer component selected from monoethylenically unsaturated sulfonic acid monomers (hereinafter referred to as “monomer component b2”). One or two weights are referred to as “Polymer B”. ) And a copolymer of maleic acid and / or one or more water-soluble salts of maleic acid and a copolymer of isobutylene (hereinafter referred to as “polymer C”). A method for treating a cooling water system.
8. A cooling water treatment method according to claim 5, wherein the monomer component b3 is N-tert-butylacrylamide.
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| JP5369831B2 (en) * | 2009-03-31 | 2013-12-18 | 栗田工業株式会社 | Cooling water state measuring device and cooling tower |
| CN102241441B (en) * | 2010-05-14 | 2015-12-02 | 纳尔科公司 | Comprise the composition and use thereof of AA-AMPS multipolymer and PMA |
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| JPH01299699A (en) * | 1988-05-30 | 1989-12-04 | Hakutou Kagaku Kk | Non-phosphorus water treating agent for preventing corrosion and scale of metals in water system |
| CA2042341C (en) * | 1990-05-23 | 2001-06-12 | Judy H. Bardsley | Silica scale inhibition |
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