JP2007277769A - Cleanser for paper/pulp manufacturing process and cleansing method for paper/pulp manufacturing process system - Google Patents

Cleanser for paper/pulp manufacturing process and cleansing method for paper/pulp manufacturing process system Download PDF

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JP2007277769A
JP2007277769A JP2006107090A JP2006107090A JP2007277769A JP 2007277769 A JP2007277769 A JP 2007277769A JP 2006107090 A JP2006107090 A JP 2006107090A JP 2006107090 A JP2006107090 A JP 2006107090A JP 2007277769 A JP2007277769 A JP 2007277769A
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JP4520424B2 (en
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Hirokazu Tanabe
寛和 田邊
Tetsuo Ibaya
哲夫 井波谷
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Hakuto Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleanser for paper/pulp manufacturing process, capable of exerting sufficient cleansing effect in a short time for scales containing barium sulfate or calcium sulfate, and to provide a cleansing method for such paper/pulp manufacturing process system. <P>SOLUTION: The cleanser comprises as active ingredients at least one salt among carbonate, phosphate and phosphonate and an aminocarboxylic acid salt-type chelating agent. By incorporating this cleanser in a paper/pulp manufacturing process system to effect the pH of the system to 8 or higher, barium sulfate or calcium sulfate in deposits is dissolved and removed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、紙・パルプ製造工程用洗浄剤及び紙・パルプ製造工程系の洗浄方法に関し、更に詳しくは、紙・パルプ製造工程水系のワイヤーピットの壁材や配管に付着した硫酸バリウムや硫酸カルシウムを含んだデポジットを洗浄するのに好適な紙・パルプ製造工程用洗浄剤及び紙・パルプ製造工程系の洗浄方法に関する。   The present invention relates to a cleaning agent for paper / pulp manufacturing process and a cleaning method for paper / pulp manufacturing process, and more particularly, barium sulfate and calcium sulfate adhering to wall material and piping of wire pit of paper / pulp manufacturing process water system. The present invention relates to a cleaning agent for paper / pulp manufacturing process and a cleaning method for a paper / pulp manufacturing process system suitable for cleaning deposits containing water.

紙・パルプ製造工程においては、その工程水系中の配管や壁材の表面にデポジットが付着・堆積し、各種障害を引き起こす。このような紙・パルプ製造工程水系において付着、堆積する汚れは、充填料として古紙に入っている硫酸カルシウム、硫酸バリウム、パルプのピッチ成分、微細繊維、印刷インキ、サイズ剤等々からなる複雑な組成を有している。最近では、紙・パルプ製造工程のクローズド化や抄紙速度の上昇に伴い、これらの汚れ成分による製品品質の低下や生産効率の低下等の重大な障害を引き起こし、深刻化している。これらの中でも、硫酸バリウムや硫酸カルシウムはスケールとして硬い塊状の付着物となり、酸やアルカリにも不溶であるため除去しにくく、さまざまな障害を引き起こす原因となっている。   In the paper / pulp manufacturing process, deposits adhere to and accumulate on the surface of pipes and wall materials in the process water system, causing various obstacles. Dirt that adheres and accumulates in such paper and pulp manufacturing process water systems is a complex composition consisting of calcium sulfate, barium sulfate, pulp pitch components, fine fibers, printing ink, sizing agent, etc. contained in waste paper as a filler. have. Recently, as the paper / pulp manufacturing process is closed and the paper making speed is increased, serious problems such as a decrease in product quality and a decrease in production efficiency due to these soil components are caused and become serious. Among these, barium sulfate and calcium sulfate are hard lump deposits as scales, and are insoluble in acids and alkalis, so are difficult to remove and cause various obstacles.

従来から、紙・パルプ製造工程における洗浄剤としては、ソーダ灰等のアルカリ洗浄剤や、アミノカルボン酸キレート剤等が用いられてきたが、上記の硫酸バリウムや硫酸カルシウムからなるスケールに対してはあまり効果がなく問題となっていた。   Conventionally, alkaline detergents such as soda ash, aminocarboxylic acid chelating agents, etc. have been used as detergents in the paper and pulp manufacturing process, but for scales composed of the above barium sulfate or calcium sulfate. It was not effective and was a problem.

このため、さらに洗浄効果を高めた洗浄剤として、クエン酸、りんご酸、酒石酸等の有機酸を含有する洗浄剤(特許文献1)や、ジホスホン酸と過酸化水素を併用した洗浄剤(特許文献2)や、ヒドロキシエチリデン−1,1−ジスルホン酸やその塩を含有する洗浄剤(特許文献3)が紙・パルプ製造工程用として提案されている。   For this reason, as a cleaning agent with further improved cleaning effect, a cleaning agent containing an organic acid such as citric acid, malic acid and tartaric acid (Patent Document 1), or a cleaning agent using diphosphonic acid and hydrogen peroxide in combination (Patent Document) 2) and a cleaning agent (Patent Document 3) containing hydroxyethylidene-1,1-disulfonic acid or a salt thereof has been proposed for paper and pulp manufacturing processes.

特開昭62−141187号公報Japanese Patent Laid-Open No. 62-141187 特許第2543214号Japanese Patent No. 2543214 特許第2746563号Japanese Patent No. 2746563

しかし、上記特許文献の洗浄剤を用いたとしても、硫酸バリウムや硫酸カルシウムを含んだスケールについては、充分な洗浄効果を発揮できなかったり、長時間の洗浄を必要としたりして問題となっていた。   However, even when the cleaning agents of the above-mentioned patent documents are used, there is a problem with scales containing barium sulfate or calcium sulfate because they cannot exhibit a sufficient cleaning effect or require long-time cleaning. It was.

本発明は、上記従来の実情に鑑みてなされたものであって、硫酸バリウムや硫酸カルシウムを含んだスケールに対して短時間で充分な洗浄効果を発揮することができる紙・パルプ製造工程用洗浄剤及び紙・パルプ製造工程用洗浄剤系の洗浄方法を提供することを解決すべき課題としている。   The present invention has been made in view of the above-described conventional situation, and is a paper / pulp manufacturing process cleaning capable of exhibiting a sufficient cleaning effect in a short time for a scale containing barium sulfate or calcium sulfate. It is an issue to be solved to provide a cleaning method for a cleaning agent system for the agent and paper / pulp manufacturing process.

本発明の紙・パルプ製造工程用洗浄剤は、炭酸塩、リン酸塩及びホスホン酸塩の少なくとも1種と、アミノカルボン酸塩型キレート剤とを有効成分として含むことを特徴とする。   The detergent for paper / pulp production process of the present invention is characterized by containing at least one of carbonate, phosphate and phosphonate and an aminocarboxylate-type chelating agent as active ingredients.

また、本発明の紙・パルプ製造工程系の洗浄方法は、炭酸塩、リン酸塩及びホスホン酸塩の少なくとも1種と、アミノカルボン酸塩型キレート剤とを有効成分として含み、pHは8以上とされていることを特徴とする。   In addition, the paper / pulp manufacturing process cleaning method of the present invention includes at least one of carbonate, phosphate and phosphonate and an aminocarboxylate-type chelating agent as active ingredients, and has a pH of 8 or more. It is said that it is said.

本発明における作用は次のように考えられる。すなわち、まず炭酸塩、リン酸塩及びホスホン酸塩が難溶解性の硫酸カルシウムや硫酸バリウムの表面において置換反応を行い、炭酸塩、リン酸塩及びホスホン酸塩となる(発明者らは、硫酸バリウムが置換反応によって炭酸バリウムに変化することを確認している)。そして、さらに置換反応によって生じたカルシウムやバリウムの塩がアミノカルボン酸塩型キレート剤によってキレート化されて溶解する。アミノカルボン酸塩型キレート剤によるカルシウムやバリウムのキレートの安定性はpHが8以上で特に優れており、pHを8以上とすることで優れた洗浄効果が得られる。特に好ましいpHは9以上である。これによりスケール中の硫酸カルシウムや硫酸バリウムは、短時間に溶解除去されることとなる。   The action in the present invention is considered as follows. That is, first, carbonates, phosphates and phosphonates undergo a substitution reaction on the surface of sparingly soluble calcium sulfate or barium sulfate to become carbonates, phosphates and phosphonates. It has been confirmed that barium is changed to barium carbonate by a substitution reaction). Further, calcium or barium salts generated by the substitution reaction are chelated and dissolved by the aminocarboxylate type chelating agent. The stability of the chelate of calcium or barium by the aminocarboxylate type chelating agent is particularly excellent when the pH is 8 or higher, and an excellent cleaning effect can be obtained by setting the pH to 8 or higher. Particularly preferred pH is 9 or more. Thereby, calcium sulfate and barium sulfate in the scale are dissolved and removed in a short time.

したがって、本発明の紙・パルプ製造工程用洗浄剤及び本発明の紙・パルプ製造工程系の洗浄方法によれば、硫酸バリウムや硫酸カルシウムを含んだスケールに対して短時間で充分な洗浄効果を発揮することができる。   Therefore, according to the cleaning agent for the paper / pulp manufacturing process of the present invention and the cleaning method of the paper / pulp manufacturing process system of the present invention, a sufficient cleaning effect can be obtained in a short time against a scale containing barium sulfate or calcium sulfate. It can be demonstrated.

なお、本発明の紙・パルプ製造工程用洗浄剤ではpHを6〜8(ただし、炭酸塩を含有する場合には発泡を防止するため7〜8)として、紙・パルプ製造工程系中に入れる直前、又は紙・パルプ製造工程系中に入れてから、アルカリを添加してpHが8以上とすることが好ましい。こうであれば、紙・パルプ製造工程用洗浄剤としてはアルカリ性が強くないため、取り扱いにおける安全性が高くなる。   In the cleaning agent for paper / pulp manufacturing process of the present invention, the pH is set to 6-8 (however, 7-8 to prevent foaming when carbonate is contained), it is put into the paper / pulp manufacturing process system. It is preferable that the pH is adjusted to 8 or more by adding an alkali immediately before or in the paper / pulp manufacturing process system. If it is like this, since the alkalinity is not strong as a cleaning agent for paper / pulp production process, the safety in handling becomes high.

また、炭酸塩、リン酸塩及びホスホン酸塩とアミノカルボン酸塩型キレート剤との混合モル比率は10:1〜1:10であることが好ましく、さらに好ましいのは、3:1〜1:6である。こうであれば、特に優れた洗浄効果を奏することができる。   The mixing molar ratio of carbonate, phosphate and phosphonate and aminocarboxylate type chelating agent is preferably 10: 1 to 1:10, more preferably 3: 1 to 1: 6. In this way, a particularly excellent cleaning effect can be achieved.

本発明の紙・パルプ製造工程用洗浄剤に含まれる有効成分である炭酸塩、リン酸塩及びホスホン酸塩としては、炭酸水素ナトリウム、炭酸ナトリウム、炭酸カリウム、炭酸水素カリウム、リン酸の1〜3ナトリウム塩、リン酸の1〜3カリウム塩、ホスホノブタントリカルボン酸の1〜5ナトリウム塩(PBTC・1〜5Na)、ホスホノブタントリカルボン酸の1〜5カリウム塩(PBTC・1〜5K)、ヒドロキシエチリデン−1,1−ジホスホン酸の1〜4ナトリウム塩(HEDP・1〜4Na)、ヒドロキシエチリデン−1,1−ジホスホン酸の1〜4カリウム塩(HEDP・1〜4K)ニトリロトリスメチレンホスホン酸1〜6ナトリウム塩(NTP・1〜6Na)、ニトリロトリスメチレンホスホン酸1〜6カリウム塩(NTP・1〜6K)、N、N、N’、N’−テトラキス(ホスホノメチル)エチレンジアミンの1〜4ナトリウム塩(EDTMP・1〜4Na)、N、N、N’、N’−テトラキス(ホスホノメチル)エチレンジアミンの1〜4カリウム塩(EDTMP・1〜4K)等が挙げられる。
また、アミノカルボン酸塩型キレート剤としては、エチレンジアミン四酢酸の1〜4ナトリウム塩又はカリウム塩(EDTA・1〜4Na塩、EDTA・1〜4K塩)、ニトリロ三酢酸の1〜3ナトリウム塩又はカリウム塩(NTA・1〜3Na、NTA・1〜3K)、ヒドロキシエチレンイミノ二酢酸の1〜2ナトリウム塩又はカリウム塩(HIDA・1〜2Na、HIDA・1〜2K)、ヒドロキシエチルエチレンジアミン三酢酸の1〜3ナトリウム塩又はカリウム塩(HEDTA・1〜3Na、HEDTA・1〜3K)、ジエチレントリアミン五酢酸の1〜5ナトリウム塩又はカリウム塩(DTPA・1〜5Na塩、DTPA・1〜5K塩)、トリエチレンテトラアミン六酢酸の1〜6ナトリウム塩又はカリウム塩(TTHA・1〜6Na塩、TTHA・1〜6K塩)、ジカルボキシメチルグルタミン酸の1〜4ナトリウム塩又はカリウム塩(GLDA・1〜4Na塩、GLDA・1〜4K塩)、ジヒドロキシグリシンのナトリウム塩又はカリウム塩、プロパンジアミン四酢酸の1〜4ナトリウム塩(PDTA・1〜4Na塩、PDTA・1〜4K塩)、1,3−ジアミノ−2−ヒドロキシプロパン四酢酸の1〜4ナトリウム塩又はカリウム塩(DPTA−OH・1〜4Na塩、DPTA−OH・1〜4K塩)等が挙げられる。好ましくは、エチレンジアミン四酢酸1〜4ナトリウム塩(EDTA・1〜4Na塩)、ヒドロキシエチリデン−1,1−ジホスホン酸1〜4ナトリウム塩(HEDP・1〜4Na)である。これらの1種あるいは2種以上を組み合わせて用いてもよい。
以下、本発明を具体化した実施例を比較例と比較しつつ説明する。
Examples of the carbonate, phosphate and phosphonate that are active ingredients contained in the cleaning agent for paper / pulp production process of the present invention include sodium bicarbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, and phosphoric acid. Trisodium salt, 1-3 potassium salt of phosphoric acid, 1-5 sodium salt of phosphonobutane tricarboxylic acid (PBTC · 1-5Na), 1-5 potassium salt of phosphonobutane tricarboxylic acid (PBTC · 1-5K) Hydroxyethylidene-1,1-diphosphonic acid 1-4 sodium salt (HEDP · 1-4Na), hydroxyethylidene-1,1-diphosphonic acid 1-4 potassium salt (HEDP · 1-4K) nitrilotrismethylenephosphone Acid 1-6 sodium salt (NTP · 1-6Na), nitrilotrismethylenephosphonic acid 1-6 potassium salt (NTP 1-6K), 1-4 sodium salt of N, N, N ′, N′-tetrakis (phosphonomethyl) ethylenediamine (EDTMP · 1-4Na), N, N, N ′, N′-tetrakis (phosphonomethyl) ethylenediamine 1-4 potassium salt (EDTMP * 1-4K) etc. are mentioned.
As the aminocarboxylate-type chelating agent, ethylenediaminetetraacetic acid 1-4 sodium salt or potassium salt (EDTA · 1-4Na salt, EDTA · 1-4K salt), nitrilotriacetic acid 1-3 sodium salt or Of potassium salt (NTA · 1-3Na, NTA · 1-3K), 1-2 sodium salt or potassium salt of hydroxyethyleneiminodiacetic acid (HIDA · 1-2Na, HIDA · 1-2K), hydroxyethylethylenediaminetriacetic acid 1 to 3 sodium salt or potassium salt (HEDTA · 1 to 3 Na, HEDTA · 1 to 3 K), 1 to 5 sodium salt or potassium salt (DTPA · 1 to 5 Na salt, DTPA · 1 to 5 K salt) of diethylenetriaminepentaacetic acid, 1-6 sodium salt or potassium salt of triethylenetetraamine hexaacetic acid (TTHA · 1-6N Salt, TTHA · 1-6K salt), 1-4 sodium salt or potassium salt of dicarboxymethyl glutamic acid (GLDA · 1-4Na salt, GLDA · 1-4K salt), sodium salt or potassium salt of dihydroxyglycine, propanediamine 1-4 sodium salt of tetraacetic acid (PDTA · 1-4Na salt, PDTA · 1-4K salt), 1-4 sodium salt or potassium salt of 1,3-diamino-2-hydroxypropanetetraacetic acid (DPTA-OH · 1-4Na salt, DPTA-OH.1-4K salt) and the like. Preferred are ethylenediaminetetraacetic acid 1-4 sodium salt (EDTA.1-4Na salt) and hydroxyethylidene-1,1-diphosphonic acid 1-4 sodium salt (HEDP.1-4Na). You may use these 1 type or in combination of 2 or more types.
Hereinafter, examples embodying the present invention will be described in comparison with comparative examples.

実施例1〜4及び比較例1〜5
<紙・パルプ製造工程用洗浄剤の調製>
実施例1〜4では、水酸化ナトリウムとEDTA・4Na塩と、炭酸塩、リン酸塩又はホスホン酸塩を混合して洗浄剤を調製した。また、比較例1〜5では、水酸化ナトリウムとEDTA・4Na塩は混合されているが、炭酸塩、リン酸塩又はホスホン酸塩は含まれていない洗浄液を調製した。具体的な組成については表1に示す。ここで、PBTC4Naとは、ホスホノブタントリカルボン酸4ナトリウム塩のことをいい、HEDP5Naとは、ヒドロキシエチリデン−1,1−ジホスホン酸・5Na塩のことをいう。また、比較例3に示したソルフィットとは、イソプレンに水を付加した2級アルコールである(クラレイソプレン株式会社製)。

Figure 2007277769
Examples 1-4 and Comparative Examples 1-5
<Preparation of detergent for paper and pulp manufacturing process>
In Examples 1 to 4, a cleaning agent was prepared by mixing sodium hydroxide, EDTA · 4Na salt, carbonate, phosphate or phosphonate. Moreover, in Comparative Examples 1-5, although the sodium hydroxide and EDTA * 4Na salt were mixed, the washing | cleaning liquid which does not contain carbonate, phosphate, or phosphonate was prepared. The specific composition is shown in Table 1. Here, PBTC4Na refers to phosphonobutanetricarboxylic acid tetrasodium salt, and HEDP5Na refers to hydroxyethylidene-1,1-diphosphonic acid · 5Na salt. Solfit shown in Comparative Example 3 is a secondary alcohol obtained by adding water to isoprene (manufactured by Kuraray isoprene Co., Ltd.).
Figure 2007277769

<硫酸バリウム溶解試験>
上記実施例1〜4及び比較例1〜5で調製した洗浄剤を200mlとり、300mlの三角フラスコに入れ、さらに試薬の硫酸バリウム0.2gを加える。そして、ロータリーシェーカーにセットした後、150rpmで3時間振とうした。そして、重量既知のNo.5Cのろ紙でろ過し、水洗後乾燥して重量を測定し、残留物の重量を求めた。結果を表1に示す。この表から分かるように、実施例1〜4では、硫酸バリウムの溶解率が81%以上と極めて高いのに対し、比較例1〜5では40〜67.5%と低く、アミノカルボン酸塩型キレート剤としてのEDTA・4Na塩と、炭酸塩、リン酸塩又はホスホン酸塩とを混合した洗浄剤が硫酸バリウムに対して短時間で充分な洗浄効果を奏することが分かった。
<Barium sulfate dissolution test>
200 ml of the cleaning agents prepared in Examples 1 to 4 and Comparative Examples 1 to 5 are taken, put into a 300 ml Erlenmeyer flask, and 0.2 g of reagent barium sulfate is added. And after setting to a rotary shaker, it was shaken at 150 rpm for 3 hours. And No. of known weight. The mixture was filtered with 5C filter paper, washed with water, dried and weighed to determine the weight of the residue. The results are shown in Table 1. As can be seen from this table, in Examples 1 to 4, the dissolution rate of barium sulfate is as extremely high as 81% or more, whereas in Comparative Examples 1 to 5, it is as low as 40 to 67.5%. It has been found that a cleaning agent in which EDTA · 4Na salt as a chelating agent and carbonate, phosphate or phosphonate are mixed has a sufficient cleaning effect on barium sulfate in a short time.

実施例5〜11及び比較例6〜8
<紙・パルプ製造工程用洗浄剤の調製>
実施例5〜11では、水酸化ナトリウムを1%、EDTA・4Na塩を0.8%と固定し、炭酸塩、リン酸塩又はホスホン酸塩の種類及び濃度を変化させて洗浄剤を調製した。また、比較例6〜8では、水酸化ナトリウムと炭酸塩、リン酸塩又はホスホン酸塩とが含まれているが、EDTA・4Na塩は含まれていない洗浄剤を調製した。さらに比較例9〜11においてもEDTA・4Na塩は含まれていない洗浄剤を調製した。具体的な組成については、表2に示す。

Figure 2007277769
Examples 5-11 and Comparative Examples 6-8
<Preparation of detergent for paper and pulp manufacturing process>
In Examples 5 to 11, sodium hydroxide was fixed at 1% and EDTA · 4Na salt was fixed at 0.8%, and the type and concentration of carbonate, phosphate or phosphonate were changed to prepare cleaning agents. . Moreover, in Comparative Examples 6-8, although the sodium hydroxide and carbonate, phosphate, or phosphonate were contained, the detergent which does not contain EDTA * 4Na salt was prepared. Further, in Comparative Examples 9 to 11, cleaning agents containing no EDTA · 4Na salt were prepared. The specific composition is shown in Table 2.
Figure 2007277769

<硫酸バリウム溶解試験>
上記実施例5〜11及び比較例6〜11で調製した洗浄剤について、上記と同様の硫酸バリウム溶解試験を行った。結果を表2に示す。この表から分かるように、実施例5〜11では、硫酸バリウムの高い溶解率を示した。これに対して、EDTA・4Na塩が含まれていない比較例6〜8では、溶解率が6.5〜12.5%と極めて低かった。さらに比較例9〜11では、ほとんど除去されなかった。
<Barium sulfate dissolution test>
About the cleaning agent prepared in the said Examples 5-11 and Comparative Examples 6-11, the barium sulfate dissolution test similar to the above was done. The results are shown in Table 2. As can be seen from this table, Examples 5 to 11 showed a high dissolution rate of barium sulfate. On the other hand, in Comparative Examples 6 to 8 containing no EDTA · 4Na salt, the dissolution rate was extremely low at 6.5 to 12.5%. Furthermore, in Comparative Examples 9-11, it was hardly removed.

実施例12〜15及び比較例12
<紙・パルプ製造工程用洗浄剤の調製>
実施例12〜15では、水酸化ナトリウムを1%、EDTA・4Na塩を0.4%と固定し、炭酸ナトリウムの濃度を変化させて洗浄剤を調製した。また、比較例12では、水酸化ナトリウムを1%、EDTA・4Na塩を0.4%とし、炭酸ナトリウムは加えなかった。具体的な組成については、表3に示す。

Figure 2007277769
Examples 12 to 15 and Comparative Example 12
<Preparation of detergent for paper and pulp manufacturing process>
In Examples 12 to 15, cleaning agents were prepared by fixing sodium hydroxide at 1% and EDTA · 4Na salt at 0.4% and changing the concentration of sodium carbonate. In Comparative Example 12, sodium hydroxide was 1%, EDTA · 4Na salt was 0.4%, and sodium carbonate was not added. The specific composition is shown in Table 3.
Figure 2007277769

<硫酸バリウム溶解試験>
上記実施例12〜15及び比較例12で調製した洗浄剤について、上記と同様の硫酸バリウム溶解試験を行った。結果を表3に示す。この表から分かるように、実施例12〜15では、比較例12よりも高い硫酸バリウムの溶解率を示した。また、炭酸ナトリウムの濃度が高くなると、硫酸バリウムの溶解率も高くなった。
<Barium sulfate dissolution test>
The cleaning agents prepared in Examples 12 to 15 and Comparative Example 12 were subjected to the same barium sulfate dissolution test as described above. The results are shown in Table 3. As can be seen from this table, Examples 12 to 15 showed a higher dissolution rate of barium sulfate than Comparative Example 12. Moreover, the dissolution rate of barium sulfate increased as the concentration of sodium carbonate increased.

実施例16〜21及び比較例13〜17
洗浄剤のpHの影響を調べるために、洗浄剤のpHを変化させて硫酸バリウムの溶解率を調べた。用いた洗浄剤の組成を表4に示す。なお、pHの調整には塩酸を用いた。

Figure 2007277769
Examples 16-21 and Comparative Examples 13-17
In order to investigate the influence of the pH of the cleaning agent, the dissolution rate of barium sulfate was examined by changing the pH of the cleaning agent. The composition of the cleaning agent used is shown in Table 4. In addition, hydrochloric acid was used for pH adjustment.
Figure 2007277769

表4から、いずれの洗浄剤においても、pHが8以上において硫酸バリウムの溶解率が高いことが分かる。   From Table 4, it can be seen that in any of the cleaning agents, the dissolution rate of barium sulfate is high when the pH is 8 or more.

硫酸バリウムを炭酸カリウム水溶液へ浸漬した場合の変化
本発明における炭酸塩の役割を調べるため、1%及び5%の炭酸カリウムを調製し、上述した硫酸バリウム溶解試験と同様、炭酸カリウム水溶液を200mlとり、300mlの三角フラスコに入れ、さらに試薬の硫酸バリウム0.2gを加える。そして、ロータリーシェーカーにセットした後、150rpmで1時間振とうした。そして、No.5Cのろ紙でろ過し、水洗及び遠心分離の操作を4回繰り返してから乾燥し、IR測定を行った。その結果、図1に示すように、炭酸カリウム水溶液で振とうすることにより、硫酸バリウムに起因する吸収が小さくなり、炭酸カリウムのカルボニル基に起因する吸収が大きくなった。そして、その効果は1%よりも5%の場合のほうが大きかった。このことから、炭酸カリウムは硫酸バリウムに対して硫酸根と置換反応を起こし、炭酸カリウムに変化することが推測された。そして、本発明の紙・パルプ製造工程用洗浄剤では、置換反応によって生じたバリウムの炭酸塩がアミノカルボン酸塩型キレート剤によってキレート化されて溶解すると推測される。硫酸カルシウムについても同様の作用から、溶解除去されると推測される。
Changes when barium sulfate is immersed in aqueous potassium carbonate solution In order to investigate the role of carbonate in the present invention, 1% and 5% potassium carbonate were prepared, and 200 ml of aqueous potassium carbonate solution was taken as in the barium sulfate dissolution test described above. Into a 300 ml Erlenmeyer flask, 0.2 g of reagent barium sulfate is added. And after setting to a rotary shaker, it was shaken at 150 rpm for 1 hour. And No. The mixture was filtered with 5C filter paper, washed with water and centrifuged four times, dried, and then subjected to IR measurement. As a result, as shown in FIG. 1, by shaking with an aqueous potassium carbonate solution, the absorption due to barium sulfate was reduced and the absorption due to the carbonyl group of potassium carbonate was increased. The effect was greater at 5% than at 1%. From this, it was speculated that potassium carbonate undergoes a substitution reaction with the sulfate radical for barium sulfate and changes to potassium carbonate. In the cleaning agent for paper / pulp manufacturing process of the present invention, it is presumed that the carbonate of barium produced by the substitution reaction is chelated by an aminocarboxylate type chelating agent and dissolved. It is estimated that calcium sulfate is dissolved and removed from the same action.

実機から採取したデポジットに対する溶解試験
実際の紙・パルプ製造工程から採取された硫酸バリウム主体のデポジットを用いて、上述した硫酸バリウム溶解試験を行った。表5に、試験に用いた実施例22〜28及び比較例18〜25の洗浄液の組成及び試験結果を示す。この表に示すように、実施例22〜28では88%以上のきわめて高い除去率を示したのに対し、比較例21〜25の除去率は2〜12%ときわめて低かった。このことから、本発明の紙・パルプ製造工程用洗浄剤は、硫酸バリウムを含んだスケールに対して短時間で充分な洗浄効果を発揮することが分かった。また、このことから硫酸バリウムと同様の挙動を示すと考えられる硫酸カルシウムを含んだデポジットに対しても、同様の効果を奏することができる。

Figure 2007277769
Dissolution test for deposits collected from actual machines The barium sulfate dissolution test described above was performed using a barium sulfate-based deposit collected from the actual paper and pulp manufacturing process. Table 5 shows the compositions and test results of the cleaning liquids of Examples 22 to 28 and Comparative Examples 18 to 25 used in the test. As shown in this table, Examples 22 to 28 showed a very high removal rate of 88% or more, while Comparative Examples 21 to 25 showed a very low removal rate of 2 to 12%. From this, it was found that the cleaning agent for paper / pulp production process of the present invention exhibits a sufficient cleaning effect for a scale containing barium sulfate in a short time. In addition, the same effect can be obtained for deposits containing calcium sulfate, which is considered to exhibit the same behavior as barium sulfate.
Figure 2007277769

この発明は、上記発明の実施例の説明に何ら限定されるものではない。特許請求の範囲の記載を逸脱せず、当業者が容易に想到できる範囲で種々の変形態様もこの発明に含まれる。   The present invention is not limited to the description of the embodiments of the invention. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

硫酸バリウムを炭酸カリウム水溶液へ浸漬した場合におけるIRの変化を示すスペクトルである。It is a spectrum which shows the change of IR when a barium sulfate is immersed in potassium carbonate aqueous solution.

Claims (4)

炭酸塩、リン酸塩及びホスホン酸塩の少なくとも1種と、アミノカルボン酸塩型キレート剤と、を有効成分として含むことを特徴とする紙・パルプ製造工程用洗浄剤。   A cleaning agent for paper and pulp manufacturing process, comprising at least one of carbonate, phosphate and phosphonate and an aminocarboxylate-type chelating agent as active ingredients. 炭酸塩、リン酸塩及びホスホン酸塩とアミノカルボン酸塩型キレート剤との混合モル比率は10:1〜1:10であることを特徴とする請求項1記載の紙・パルプ製造工程用洗浄剤。   2. The washing for paper / pulp manufacturing process according to claim 1, wherein the mixing molar ratio of carbonate, phosphate and phosphonate and aminocarboxylate type chelating agent is 10: 1 to 1:10. Agent. 紙・パルプ製造工程系中に、炭酸塩、リン酸塩及びホスホン酸塩の少なくとも1種と、アミノカルボン酸塩型キレート剤とが添加されており、pHが8以上とされている洗浄水を流通させることを特徴とする紙・パルプ製造工程系の洗浄方法。   Washing water in which at least one of carbonate, phosphate and phosphonate and an aminocarboxylate-type chelating agent are added to the paper / pulp manufacturing process system and the pH is 8 or more A paper / pulp manufacturing process cleaning method characterized by being distributed. 炭酸塩、リン酸塩及びホスホン酸塩とアミノカルボン酸塩型キレート剤との混合モル比率は10:1〜1:10であることを特徴とする請求項3記載の紙・パルプ製造工程系の洗浄方法。   4. The paper / pulp production process system according to claim 3, wherein the mixing molar ratio of the carbonate, phosphate and phosphonate and the aminocarboxylate type chelating agent is 10: 1 to 1:10. 5. Cleaning method.
JP2006107090A 2006-04-10 2006-04-10 Cleaning method for paper and pulp manufacturing process Expired - Fee Related JP4520424B2 (en)

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JP2007307478A (en) * 2006-05-18 2007-11-29 Hakuto Co Ltd Method for cleaning deposit
JP2009133054A (en) * 2007-11-06 2009-06-18 Hakuto Co Ltd Deposit-removing agent in process for applying color coat for papermaking and deposit-removing method

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JPH04202299A (en) * 1990-11-29 1992-07-23 Hakutou Kagaku Kk Detergent for paper machine felt
JPH05262710A (en) * 1991-07-12 1993-10-12 Dow Chem Co:The Carbonyl-containing degradable chelating agent
JPH11181691A (en) * 1997-12-17 1999-07-06 Hakuto Co Ltd Washing of felt for papermaking
JP2000234286A (en) * 1999-02-10 2000-08-29 Hakuto Co Ltd Cleaning of scale in pulp digester and its peripheral equipment
JP2000265192A (en) * 1999-03-18 2000-09-26 Hakuto Co Ltd Washing method for stain derived from alkenyl succinic anhydride sizing agent
JP2002018487A (en) * 2000-07-10 2002-01-22 Miura Co Ltd Water treatment method for boiler system
JP2002292398A (en) * 2001-03-30 2002-10-08 Kurita Water Ind Ltd Inhibitor composition for scale containing calcium and method for preventing scale containing calcium in water system
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JP2005314824A (en) * 2004-04-27 2005-11-10 Hakuto Co Ltd Method for cleaning lime mud filter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007307478A (en) * 2006-05-18 2007-11-29 Hakuto Co Ltd Method for cleaning deposit
JP2009133054A (en) * 2007-11-06 2009-06-18 Hakuto Co Ltd Deposit-removing agent in process for applying color coat for papermaking and deposit-removing method

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