JPH0491284A - Method for eliminating fluorescent reaction in waste paper - Google Patents
Method for eliminating fluorescent reaction in waste paperInfo
- Publication number
- JPH0491284A JPH0491284A JP2205117A JP20511790A JPH0491284A JP H0491284 A JPH0491284 A JP H0491284A JP 2205117 A JP2205117 A JP 2205117A JP 20511790 A JP20511790 A JP 20511790A JP H0491284 A JPH0491284 A JP H0491284A
- Authority
- JP
- Japan
- Prior art keywords
- waste paper
- hypochlorite
- reaction
- pulp
- fluorescent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010893 paper waste Substances 0.000 title claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 12
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007850 fluorescent dye Substances 0.000 abstract description 8
- 229920001131 Pulp (paper) Polymers 0.000 description 9
- 238000004061 bleaching Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XTEGARKTQYYJKE-UHFFFAOYSA-M Chlorate Chemical compound [O-]Cl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-M 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000287127 Passeridae Species 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000004792 oxidative damage Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Paper (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は古紙中に含まれる蛍光染料の蛍光を消去する方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for erasing the fluorescence of fluorescent dyes contained in waste paper.
［従来の技術］
近年、原料確保と雀資源、省エネルギーの観点から、古
紙の利用率が高まり、紙の製造工程においては古紙を使
用する場合が多くなってきている。[Prior Art] In recent years, the utilization rate of waste paper has increased from the viewpoint of securing raw materials, sparrow resources, and energy conservation, and waste paper is increasingly being used in the paper manufacturing process.
しかしながら紙の製造工程においては、蛍光染料を使用
する場合があり、このような染料を使用した紙を再生す
る場合、通常の処理方法では蛍光を消去できず、特に再
生された紙が食品関係あるいは衛生紙等の分野に用いら
れる場合、大きな問題が生じる。However, fluorescent dyes are sometimes used in the paper manufacturing process, and when paper containing such dyes is recycled, the fluorescence cannot be erased using normal processing methods, especially if the recycled paper is food-related or When used in fields such as sanitary paper, a major problem arises.
従来次亜塩素酸塩は漂白用薬品として紙パルプの製造分
野で利用されているが、この次亜塩素酸塩にはこのよう
な蛍光を消去する作用もあることが知られている。Conventionally, hypochlorite has been used as a bleaching chemical in the paper pulp manufacturing field, but it is also known that this hypochlorite has the ability to eliminate such fluorescence.
たとえば特開昭８２−９７９９３号公報には、この次亜
塩素酸塩による蛍光消去の方法が記載されている。この
場合、古紙パルプのＰＨを１０以上に調整し、これに次
亜塩素酸ナトリウムを加え、常温〜６０℃以内の温度で
長時間（３時間以上）貯留して反応を行わせている。For example, Japanese Patent Application Laid-Open No. 82-97993 describes a method of eliminating fluorescence using hypochlorite. In this case, the pH of the waste paper pulp is adjusted to 10 or higher, sodium hypochlorite is added thereto, and the mixture is stored for a long time (more than 3 hours) at a temperature between room temperature and 60° C. to carry out the reaction.
しかしながら、このような方法は、従来の次亜塩素酸塩
を漂白に使用する場合の反応条件とほとんどかわらず、
したがって従来行われている次亜塩素酸塩漂白をその
ままおこなえば、蛍光消去反応も自動的に達成されるこ
とになるものの、このようなアルカリサイドで反応をお
こなう方法では反応速度が遅いため、効果を発現させる
ためには長時間の貯溜を必要とし、そのためかえってパ
ルプの損傷と着色を増してしまう結果となる。However, such a method requires little difference from the reaction conditions when using conventional hypochlorite for bleaching.
Therefore, if conventional hypochlorite bleaching is carried out as it is, the fluorescence quenching reaction will be achieved automatically, but the reaction rate is slow with such a method of carrying out the reaction with alkaliside, making it ineffective. In order to develop this, long-term storage is required, which results in increased damage and coloration of the pulp.
［発明が解決しようとする課＃［］
本発明は以上の実状に鑑み、蛍光染料を含む古紙から蛍
光反応を効率的に消去する方法を提供しようとするもの
である。[Problem to be Solved by the Invention #] In view of the above-mentioned circumstances, the present invention seeks to provide a method for efficiently eliminating fluorescent reactions from waste paper containing fluorescent dye.
［問題を解決するための手段］
すなわち本発明はパルパーなどで離解された蛍光染料を
含む古紙に、ＰＨ５〜９の範囲で次亜塩素酸塩を添加し
、３０〜９０℃の温度で反応させることを特徴とする、
古紙中の蛍光反応消去法に関する。[Means for solving the problem] That is, in the present invention, hypochlorite is added to waste paper containing a fluorescent dye disintegrated by a pulper or the like at a pH range of 5 to 9, and the mixture is reacted at a temperature of 30 to 90°C. characterized by
Concerning fluorescence reaction elimination method in waste paper.
次亜塩素酸塩をパルプの漂白に使用することは良く知ら
れている。この次亜塩素酸塩漂白は、通常アルカリサイ
ドで行われる。この理由として、中性近辺では次亜塩素
酸塩の塩素酸塩への分解反応 炭水化物に対する酸化損
傷反応などの速度が急激に高まるためとされている。The use of hypochlorite for pulp bleaching is well known. This hypochlorite bleaching is usually carried out with an alkali cide. The reason for this is said to be that near neutrality, the rate of decomposition reaction of hypochlorite to chlorate, oxidative damage reaction of carbohydrates, etc. increases rapidly.
従って、通′ｙ＃漂白中のＰＨは充分に高く保つように
留意され、一般には漂白開始時にアルカリを過剰に添加
してＰＨＩＯ〜１１程度で漂白を開始し、最終ＰＨが９
を切らないようにするのが次亜塩素酸塩漂白の通例であ
る。Therefore, care must be taken to keep the pH during bleaching sufficiently high, and in general, excessive alkali is added at the start of bleaching to start bleaching at about PHIO ~ 11, and the final pH is 9.
The common practice with hypochlorite bleaching is to avoid cutting.
これまで消蛍光反応に関しても、この通例にならい、ア
ルカリサイドで反応が行われていたが、本発明者らは１
次亜塩素酸塩を用いて古紙パルプの蛍光反応を消去する
にあたり、処理ｐＨを従来漂白において好ましいとされ
ていた条件とは異なり、従来のアルカリサイドから中性
域（ＰＨ５〜９）好ましくは７〜８に般定することによ
り、蛍光反応を消去させる効果が飛躍的に向上すること
を見いだした。Up until now, the quenching reaction has also been carried out using alkaliside following this conventional method, but the present inventors have
When using hypochlorite to eliminate the fluorescent reaction of waste paper pulp, the treatment pH is different from the conditions that were conventionally considered preferable for bleaching, and the pH range is from the conventional alkaline side to the neutral range (pH 5 to 9), preferably 7. It has been found that the effect of eliminating the fluorescence reaction can be dramatically improved by setting the formula to 8.
ｐＨが５に満たないと、次亜塩素Ｗ／ＩＩＭの塩素への
分解反応が進んでしまい、また９を越えると消蛍光反応
の効率が急激に低下する。When the pH is less than 5, the decomposition reaction of hypochlorite W/IIM to chlorine progresses, and when it exceeds 9, the efficiency of the quenching reaction decreases rapidly.
本発明において、次亜塩素酸塩の添加時およびそれに続
く貯溜時の古紙パルプの温度は、３０〜９０℃好ましく
は５０〜７０’Ｃに保たれる。３０℃に満たないと処理
の効率が低下し、９０℃をこえると次亜塩素Ｗ１塩の分
解が速くなり、消量光の効果が低下する。In the present invention, the temperature of the waste paper pulp during addition of hypochlorite and subsequent storage is maintained at 30-90°C, preferably 50-70'C. If the temperature is less than 30°C, the efficiency of the treatment will decrease, and if it exceeds 90°C, the decomposition of hypochlorite W1 salt will be accelerated and the effect of the quenching light will be reduced.
本発明において次亜塩素酸塩の種類は特に限定されない
が、−船釣にはナトリウム塩、カルシウム塩が用いられ
る。また、数基の古紙パルプに対する添加量は、次亜塩
素酸塩で０．１％以上、好ましくは０． ５〜２．０％
が好適である。In the present invention, the type of hypochlorite is not particularly limited, but sodium salts and calcium salts are used for boat fishing. In addition, the amount of hypochlorite added to several waste paper pulps is 0.1% or more, preferably 0.1% or more. 5-2.0%
is suitable.
本発明において、次亜塩素酸塩を添加し、その後貯溜す
る時の古紙パルプの濃度は５〜３０％好ましくは１０〜
２０％である。パルプ濃度が下限に満たない場合には薬
品や蒸気の使用量が増加するために効率が低下し、上限
をこえる場合には、薬液とパルプの混合が満足にできな
いため、均一な消量光パルプを得ることができない。In the present invention, the concentration of waste paper pulp when hypochlorite is added and then stored is 5 to 30%, preferably 10 to 30%.
It is 20%. If the pulp concentration is less than the lower limit, the amount of chemicals and steam used will increase, resulting in a decrease in efficiency; if it exceeds the upper limit, the mixing of the chemical and pulp will not be satisfactory, resulting in a uniformly quenched optical pulp. can't get it.
また、従来のアルカリサイドの処理では、前述したよう
に長時間（３時間以上）の貯溜が必要であったものが、
本方法によれば、短時間（１時間以内）で充分となり、
なおかつより高い消量光効果が得られる。更にこのよう
に処理時間の短縮が可能になったため、これまでのよう
に、アルカリ中に長時間貯溜するために起こるパルプの
着色（白色度の低下）も低減される６本発明は、蛍光染
料を含む古紙の割合が大なほど効果は大きく、 リグニ
ンを多量に含む古紙に対しては次亜塩素酸塩がリグニン
に消費されるため、消量光の効率は低下する。従って、
本発明において特に効果のある古紙は、上質紙。In addition, in conventional alkali cide treatment, as mentioned above, long-term storage (more than 3 hours) is required.
According to this method, a short time (within 1 hour) is sufficient;
Moreover, a higher extinction light effect can be obtained. Furthermore, since the processing time can be shortened in this way, the coloration (decrease in whiteness) of pulp that occurs due to long-term storage in alkali, which was previously the case, is also reduced. The greater the proportion of waste paper containing lignin, the greater the effect; for waste paper containing a large amount of lignin, hypochlorite is consumed by lignin, so the efficiency of quenching light decreases. Therefore,
The waste paper that is particularly effective in the present invention is high-quality paper.
上質塗工紙等の古紙で、しかも蛍光染料を多量に含んだ
ものである。It is a waste paper such as high-quality coated paper that contains a large amount of fluorescent dye.
本発明において、次亜塩素酸塩を添加する場所は、一般
の古紙処理工程中で特に制限されないが、好ましいのは
脱墨工程のフローテーションの後である。この場合、た
とえばフローテーションされたパルプをスクリュープレ
ス等で５〜３０％濃度に５ＩＩｌシ、温度を３０〜９０
℃に上げて次亜塩素酸塩溶液を添加する。その後。In the present invention, the place where hypochlorite is added is not particularly limited in the general waste paper processing process, but it is preferably after flotation in the deinking process. In this case, for example, the floatated pulp is heated to a concentration of 5 to 30% using a screw press, etc., and the temperature is set to 30 to 90%.
℃ and add the hypochlorite solution. after that.
高速度攪拌機等で混合し、貯溜槽に移送し、貯渭するこ
とによって消量光パルプが得られる。Extinguishable optical pulp is obtained by mixing with a high-speed stirrer or the like, transferring to a storage tank, and storing the mixture.
［実施例コ 以下に本発明の実施例を示す。[Example code] Examples of the present invention are shown below.
古紙パルプの調整
上質塗工紙の断裁紙をパルパーで離解し、濃度１％でフ
ローテーションを行った。こうして得られた古紙パルプ
（ブランク）の蛍光の強さを１００とした。Preparation of waste paper pulp Cut high-quality coated paper was disintegrated using a pulper, and flotation was performed at a concentration of 1%. The fluorescence intensity of the waste paper pulp (blank) thus obtained was set at 100.
消量光パルプの製造
得られた古紙パルプをスクリュープレスを用いて濃縮し
、次亜塩素酸ナトリウムを対パルプ０． ５％添加し、
ニーグーを用いて攪拌したのち、パルプ濃度２０％で３
０分間貯溜した。Manufacture of quenchable optical pulp The obtained waste paper pulp was concentrated using a screw press, and sodium hypochlorite was added to the pulp at 0.0%. Add 5%,
After stirring using Nigu, 3
It was stored for 0 minutes.
ＰＨ１温度は表のように変えた。The PH1 temperature was changed as shown in the table.
得られたパルプの蛍光強さを測定し、ブランクに対する
相対値として表示した。The fluorescence intensity of the obtained pulp was measured and expressed as a value relative to the blank.
［発明の効果］
従って、本発明にかかる古紙中の蛍光反応消去法によれ
ば、蛍光染料を含む古紙から蛍光反応を効率的に消去す
ることができるため、製紙産業において得られる利益は
膨大と考えられる。[Effects of the Invention] Therefore, according to the method for eliminating fluorescent reactions in waste paper according to the present invention, it is possible to efficiently eliminate fluorescent reactions from waste paper containing fluorescent dyes, and the benefits to be obtained in the paper industry will be enormous. Conceivable.
特許出願人 本州製紙株式会社 手続補正書（自発） 平成 ２年 ９月 ３日Patent applicant: Honshu Paper Co., Ltd. Procedural amendment (voluntary) September 3, 1990
Claims (1)
、次亜塩素酸塩溶液を添加し、３０〜９０℃の温度で反
応させることを特徴とする古紙中の蛍光反応消去法。A method for eliminating fluorescence reaction in waste paper, which comprises adding a hypochlorite solution at a pH of 5 to 9 to waste paper disintegrated with a pulper or the like, and reacting at a temperature of 30 to 90°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2205117A JPH0491284A (en) | 1990-08-03 | 1990-08-03 | Method for eliminating fluorescent reaction in waste paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2205117A JPH0491284A (en) | 1990-08-03 | 1990-08-03 | Method for eliminating fluorescent reaction in waste paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0491284A true JPH0491284A (en) | 1992-03-24 |
Family
ID=16501705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2205117A Pending JPH0491284A (en) | 1990-08-03 | 1990-08-03 | Method for eliminating fluorescent reaction in waste paper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0491284A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013098219A1 (en) * | 2011-12-28 | 2013-07-04 | Akzo Nobel Chemicals International B.V. | Process for reducing fluorescence in pulp |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54138605A (en) * | 1978-04-14 | 1979-10-27 | Voith Gmbh J M | Retreating method of paper |
| JPS5598990A (en) * | 1979-01-19 | 1980-07-28 | Voith Gmbh J M | Regeneration of waste paper |
| JPS57191387A (en) * | 1981-05-18 | 1982-11-25 | Kogyo Gijutsuin | Multi-stage bleaching of mixed regenerated pulp |
| JPS615671A (en) * | 1984-06-20 | 1986-01-11 | Canon Inc | Picture processor |
| JPS6297993A (en) * | 1985-10-21 | 1987-05-07 | 株式会社 フジモトポルコン | Erasion of fluorescent reaction in old paper |
-
1990
- 1990-08-03 JP JP2205117A patent/JPH0491284A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54138605A (en) * | 1978-04-14 | 1979-10-27 | Voith Gmbh J M | Retreating method of paper |
| JPS5598990A (en) * | 1979-01-19 | 1980-07-28 | Voith Gmbh J M | Regeneration of waste paper |
| JPS57191387A (en) * | 1981-05-18 | 1982-11-25 | Kogyo Gijutsuin | Multi-stage bleaching of mixed regenerated pulp |
| JPS615671A (en) * | 1984-06-20 | 1986-01-11 | Canon Inc | Picture processor |
| JPS6297993A (en) * | 1985-10-21 | 1987-05-07 | 株式会社 フジモトポルコン | Erasion of fluorescent reaction in old paper |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013098219A1 (en) * | 2011-12-28 | 2013-07-04 | Akzo Nobel Chemicals International B.V. | Process for reducing fluorescence in pulp |
| KR20140107640A (en) * | 2011-12-28 | 2014-09-04 | 날코 컴퍼니 | Process for reducing fluorescence in pulp |
| JP2015503681A (en) * | 2011-12-28 | 2015-02-02 | ナルコ カンパニー | Method for reducing the fluorescence of pulp |
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