JPH0380917B2 - - Google Patents
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- Publication number
- JPH0380917B2 JPH0380917B2 JP14016084A JP14016084A JPH0380917B2 JP H0380917 B2 JPH0380917 B2 JP H0380917B2 JP 14016084 A JP14016084 A JP 14016084A JP 14016084 A JP14016084 A JP 14016084A JP H0380917 B2 JPH0380917 B2 JP H0380917B2
- Authority
- JP
- Japan
- Prior art keywords
- chlorine
- pulp
- function
- optical sensor
- amount
- 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.)
- Expired
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- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 70
- 239000000460 chlorine Substances 0.000 claims description 70
- 229910052801 chlorine Inorganic materials 0.000 claims description 70
- 230000003287 optical effect Effects 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 10
- 238000004076 pulp bleaching Methods 0.000 claims description 4
- 238000004061 bleaching Methods 0.000 description 24
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 6
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000004155 Chlorine dioxide Substances 0.000 description 3
- 235000019398 chlorine dioxide Nutrition 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000013055 pulp slurry Substances 0.000 description 2
- YUHVVTLNLCJEOB-UHFFFAOYSA-N [Cl].O=Cl=O Chemical compound [Cl].O=Cl=O YUHVVTLNLCJEOB-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011121 hardwood Substances 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Paper (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、パルプを漂白する工程における塩素
添加の制御方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for controlling chlorine addition in a pulp bleaching process.
（従来の技術と問題点）
リグニンを含有するパルプを漂白する際の最も
一般的な漂白薬品は塩素である。その他、必要に
応じて他の漂白薬品を組み合せて複数の漂白工程
を経て晒される。(Prior Art and Problems) The most common bleaching chemical for bleaching pulp containing lignin is chlorine. In addition, if necessary, other bleaching chemicals may be combined and exposed through multiple bleaching steps.
中でも塩素は漂白工程の前段工程で利用される
ことが多く、漂白したパルプの品質を一定に保つ
ためには、先づ塩素漂白工程に於ける塩素の添加
量をパルプ品質との関連に於て制御し、塩素漂白
工程の品質を安定化させることが重要である。 Among them, chlorine is often used in the first step of the bleaching process, and in order to maintain a constant quality of bleached pulp, the amount of chlorine added in the chlorine bleaching process must be determined in relation to the pulp quality. It is important to control and stabilize the quality of the chlorine bleaching process.
塩素漂白工程の制御方法には、一般的には光学
的センサー方式がとられている。ところで塩素と
リグニンの反応は非常に急速で室温の反応条件で
も塩素注入後数分で数10％の塩素が反応を完了す
る。したがつて未晒パルプの白色度或いは色調の
変化も急速であり、この色の変化を塩素注入時点
から３分までの間にパルプの白色度変化として光
学センサーで検出し、光学センサーの位置での白
色度が一定になるように塩素注入量を制御するの
が光学センサー方式の原理である。 Optical sensor systems are generally used to control the chlorine bleaching process. By the way, the reaction between chlorine and lignin is extremely rapid, and even under room temperature reaction conditions, several tens of percent of chlorine completes the reaction within a few minutes after chlorine injection. Therefore, the change in whiteness or color tone of unbleached pulp is rapid, and this color change is detected by an optical sensor as a change in whiteness of the pulp within 3 minutes from the time of chlorine injection, and is detected at the position of the optical sensor. The principle of the optical sensor method is to control the amount of chlorine injected so that the whiteness of the material remains constant.
ところがパルプに対する塩素の全反応時間に10
分〜60分程の時間を要する塩素漂白工程に於て、
このように短い滞留時間におけるパルプの漂白状
況をセンサーで検出し、その検出値、即ち、白色
度が一定となるように塩素注入量を制御すること
は特に漂白すべきパルプが難漂白性のものである
場合には、塩素注入過多となる傾向がある。即
ち、パルプはその材となる原木の種類によつて漂
白の難易さも様々である。例えば第３図に示すの
は漂白特性の異なる４種のパルプＡ、Ｂ、Ｃ、Ｄ
におけるそれぞれの漂白特性を塩素添加率と光学
センサー検出信号との関係で示すものである。こ
れらを前記した従来の制御方法、即ち、センサー
の目標設定値（白色度）がある一定値となるよう
に塩素を添加することは、パルプＡ、Ｂ、Ｃの塩
素添加率は第３図のA′、B′、C′となる。この時
Ａ、Ｂのパルプについてはほぼ問題ないが、Ｃの
パルプの場合は塩素過剰になる。またパルプＤに
ついては光学センサーの信号が目標の設定レベル
に達するところがないため、塩素注入量は増大し
続け、ついには所謂暴走現象を起すことになる。
このような場合には、熟練したオペレーターは目
標設定値を下げて制御することによつて暴走を回
避する手段をとる。 However, the total reaction time of chlorine to pulp is 10
In the chlorine bleaching process, which takes about 60 minutes,
In this way, detecting the bleaching status of the pulp during a short residence time using a sensor and controlling the amount of chlorine injection so that the detected value, that is, the whiteness, is constant is especially important when the pulp to be bleached is difficult to bleach. If so, there is a tendency for excessive chlorine injection. That is, the difficulty of bleaching pulp varies depending on the type of raw wood from which it is made. For example, Figure 3 shows four types of pulp A, B, C, and D with different bleaching properties.
The bleaching characteristics of each are shown in terms of the relationship between the chlorine addition rate and the optical sensor detection signal. The conventional control method described above, that is, adding chlorine so that the target setting value (whiteness) of the sensor becomes a certain constant value, is that the chlorine addition rate of pulps A, B, and C is as shown in Fig. A′, B′, C′. At this time, there is almost no problem with pulps A and B, but with pulp C, there is excess chlorine. As for pulp D, the signal from the optical sensor never reaches the target set level, so the amount of chlorine injected continues to increase, eventually causing a so-called runaway phenomenon.
In such a case, a skilled operator will take steps to avoid runaway by lowering the target set point and controlling it.
しかし、これも全くの勘に頼るものであり、
時々刻々と変化するパルプの漂白特性に対して適
正な設定値になるように迅速に対応するには難し
さがある。特に最近のように木材供給事情が厳し
く、多種類の木材を混合してパルプの原料に使う
時代では塩素注入制御の設定値を次々と変化させ
なければならず、従来の制御方法では設定変更回
数も一段と増加し、自動制御というよりもマニユ
アル制御に近いのが実情である。 However, this also relies entirely on intuition;
It is difficult to quickly respond to the ever-changing bleaching characteristics of pulp to obtain appropriate settings. Especially in the recent times when the wood supply situation is severe and many types of wood are mixed and used as raw materials for pulp, the setting value for chlorine injection control must be changed one after another, and with conventional control methods, the setting value is changed many times. The number of controls has increased further, and the reality is that it is closer to manual control than automatic control.
そしてパルプの漂白品質のバラツキも大きく、
また過剰塩素量がもたらす環境面への影響も併せ
て大きな課題となつている。 Furthermore, there are large variations in the bleaching quality of the pulp.
In addition, the environmental impact of excess chlorine has also become a major issue.
（発明が解決しようとする問題点）
本発明の目的は、前記した従来のパルプ漂白に
おける塩素注入制御方法に内在している欠点、即
ち、不適正な塩素添加を解決することにある。(Problems to be Solved by the Invention) An object of the present invention is to solve the drawback inherent in the conventional chlorine injection control method in pulp bleaching, that is, inappropriate chlorine addition.
（問題を解決するための手段及び作用）
前述のような従来の制御方法における欠点を改
良すべく検討した結果、本発明者等はパルプ漂白
工程で、塩素注入直後のライン中におけるパルプ
の白色度又は色調を光学的に検出し、塩素注入量
を制御する方法において、少なくとも光学センサ
ーの検出信号とパルプ当りの塩素添加率又は添加
量の２変数、または少なくとも光学センサーの検
出信号とパルプ流量及び塩素注入量の３変数から
なる関数での演算値が一定となるように塩素の注
入量を制御することによつて、光学センサーによ
る制御が大巾に改善されることを見出したのであ
る。上記の構成において、関数というのは、関数
の演算値と塩素反応終了後のパルプ白色度との相
関が、光学センサーの検出信号と塩素反応終了後
のパルプ白色度との相関よりも高くなるように選
ばれた関数を意味し、且つＸ、Ｙ座標のＸ軸に対
パルプ当りの塩素添加率又は添加量を、Ｙ軸に光
学センサーの検出信号をとつた場合、Ｘ、Ｙ以外
の変数と関数の演算値とが一定の時のＸ、Ｙの関
数が該座標上で右下がりの直線又は曲線となるよ
うな関数である。（なお、Ｘ軸は右方向がプラス、
Ｙ軸は上方向がプラスとする。）
而して、関数を構成する変数としては、パルプ
温度、パルプ濃度、塩素ガス圧力等を付加するこ
ともよい結果を生む。(Means and effects for solving the problem) As a result of studying to improve the shortcomings of the conventional control method as described above, the present inventors have determined that the whiteness of pulp in the line immediately after chlorine injection is controlled in the pulp bleaching process. Or, in a method of optically detecting the color tone and controlling the amount of chlorine injection, at least two variables, the detection signal of the optical sensor and the chlorine addition rate or amount per pulp, or at least the detection signal of the optical sensor, the pulp flow rate and the chlorine It has been found that control by the optical sensor can be greatly improved by controlling the amount of chlorine injected so that the calculated value as a function of the three variables of the amount of chlorine is constant. In the above configuration, the function is such that the correlation between the calculated value of the function and the pulp whiteness after the completion of the chlorine reaction is higher than the correlation between the detection signal of the optical sensor and the pulp whiteness after the completion of the chlorine reaction. , and when the X axis of the X, Y coordinates is the chlorine addition rate or amount per pulp, and the Y axis is the detection signal of the optical sensor, variables other than X and Y When the calculated value of the function is constant, the function of X and Y is a function that forms a straight line or a curved line downward to the right on the coordinates. (The X-axis is positive towards the right,
The upward direction of the Y-axis is positive. ) Adding pulp temperature, pulp concentration, chlorine gas pressure, etc. as variables constituting the function can also produce good results.
関数式の具体的内容は、装置の状態、パルプの
種類、光学センサーの設置場所、光学センサーの
特徴等により変るため、画一化はできないが、要
は関数により演算された数値と塩素段終了時の白
色度との間に相関が生じるように関数の方程式を
設定すればよいのである。因に関数の方程式を例
示すれば、
関数−
一定に調節する信号
＝K1×Os＋K2×Fc／Fp＋K3
関数−
一定に調節する信号
＝Ａ−K3／K6×Ａ＋K7×｛Os−（K4×K5）
×Fc／Fp｝＋K3
ただし、Ａ＝K1×Os＋K2×Fc／Fp＋K3
関数−
一定に調節する信号
＝K1×Os×FpK2＋K3×Fc／Fp＋K4
関数−
一定に調節する信号
＝K1×（Os＋K2・Tp＋K3）×FpK4
＋K5×Fc／Fp＋K6
関数−
一定に調節する信号
＝K1×Os＋K2×Fc＋K3
（ただし）
K1〜Kn；定数
Os；光学センサー信号
Fp；パルプ流量
Fc；塩素流量
Tp；パルプスラリー温度
上記の関数方程式で演算される値を一定に保
つように塩素流量をコントロールすると漂白品質
の安定性が可成り改善できる。 The specific content of the function equation cannot be standardized because it varies depending on the equipment condition, type of pulp, location of the optical sensor, characteristics of the optical sensor, etc., but the key is to calculate the value calculated by the function and the end of the chlorine stage. All you have to do is set the equation of the function so that there is a correlation between the brightness of the color and the whiteness of the color. To give an example of the equation of a function, we have: Function - Signal to be adjusted constantly = K 1 × Os + K 2 × Fc / Fp + K 3 Function - Signal to be adjusted to be constant = A - K 3 / K 6 × A + K 7 × {Os - (K 4 ×K 5 ) ×Fc/Fp}+K 3However , A=K 1 ×Os+K 2 ×Fc/Fp+K 3Function − Signal to be adjusted to a constant level =K 1 ×Os×Fp K2 +K 3 ×Fc/Fp+K 4 Function - Signal to be adjusted constant = K 1 × (Os + K 2 · Tp + K 3 ) × Fp K4 + K 5 × Fc / Fp + K 6 Function - Signal to be adjusted to be constant = K 1 × Os + K 2 × Fc + K 3 (However) K 1 ~ Kn; Constant Os; Optical sensor signal Fp; Pulp flow rate Fc; Chlorine flow rate Tp; Pulp slurry temperature If the chlorine flow rate is controlled to keep the value calculated by the above functional equation constant, the stability of bleaching quality will be considerably improved. can.
この場合は、第１図に示すように右下がりの破
線上で制御されることになり、第３図のＸ軸に水
平な破線と比較してより好ましい制御が出来るこ
とになる。尚、当然のこと乍ら、光学センサーの
検出信号としてはパルプの濃度、温度、流量等の
外乱因子を補正処理した後の信号を使えばより良
い制御が出来ることになる。この補正処理装置の
ない光学センサーを使用する場合には、例えば関
数、或いはを使用することによつてより良い
制御が可能となる。パルプ流量が殆ど変更されな
いか、又は変更幅が小さい工程においては、関数
−Ｖのようにパルプ流量変数（Fp）を省略して
も充分本発明の効果が発揮される。 In this case, as shown in FIG. 1, the control will be performed on the dashed line downward to the right, and more preferable control will be possible compared to the dashed line horizontal to the X-axis in FIG. It goes without saying that better control can be achieved by using, as the detection signal of the optical sensor, a signal that has been corrected for disturbance factors such as pulp concentration, temperature, and flow rate. When using an optical sensor without this correction processing device, better control is possible, for example, by using a function or. In a process in which the pulp flow rate is hardly changed or the range of change is small, the effects of the present invention can be sufficiently exhibited even if the pulp flow rate variable (F p ) is omitted as in function -V.
なお、塩素段に数秒〜数分先行して二酸化塩素
を添加するとか、塩素と共に二酸化塩素を添加す
る所謂二酸化塩素−塩素併用漂白が多く実施され
ている。二酸化塩素に比べて塩素のリグニンに対
する反応速度が極めて高く、反応初期では塩素に
よる反応が支配的であるため、このような薬品併
用系においても本発明が有効である。 Note that so-called chlorine dioxide-chlorine combined bleaching, in which chlorine dioxide is added several seconds to several minutes in advance of the chlorine stage, or chlorine dioxide is added together with chlorine, is often practiced. The reaction rate of chlorine with lignin is extremely high compared to chlorine dioxide, and the reaction with chlorine is dominant in the initial stage of the reaction, so the present invention is also effective in such a chemical combination system.
以下に実施例を記載して本発明を更に詳述す
る。 The present invention will be explained in further detail by describing examples below.
実施例 １
広葉樹材をクラフトパルプ化法で蒸解した未漂
白パルプを漂白する塩素漂白工程で、パルプ流
量、温度の影響を補正する補正処理装置付きの光
学センサーの信号とパルプ流量と塩素注入量の３
変数を関数−（第１図の破線）を使つてマイク
ロコンピユーターにより演算し、得られた演算値
が一定になるように第４図による塩素注入コント
ロールを行つた。（尚、塩素注入から光学センサ
ーまでのパルプ滞留時間は６秒である）28日間の
連続操業の結果、塩素塔出口の白色度の標準変差
σは1.40（サンプル数ｎ＝166）であつた。又、こ
の間、暴走や過剰塩素現象は皆無で、この間の設
定変更回数は42回、１日当り1.5回であつた。Example 1 In the chlorine bleaching process of bleaching unbleached pulp made by cooking hardwood materials using the kraft pulping method, the signal of an optical sensor equipped with a correction processing device that corrects the effects of pulp flow rate and temperature, as well as the pulp flow rate and chlorine injection amount 3
The variables were calculated by a microcomputer using the function - (dashed line in Figure 1), and chlorine injection was controlled according to Figure 4 so that the calculated values obtained were constant. (The pulp residence time from chlorine injection to the optical sensor is 6 seconds.) As a result of 28 days of continuous operation, the standard deviation σ of whiteness at the outlet of the chlorine tower was 1.40 (number of samples n = 166). . Also, during this period, there was no runaway or excessive chlorine phenomenon, and the settings were changed 42 times during this period, 1.5 times per day.
実施例 ２
実施例１と同じ未漂白パルプの塩素漂白工程
で、パルプ流量、温度の影響を補正する補正処理
装置付きの光学センサーの信号とパルプ流量と塩
素注入量の３変数を関数（第２図の破線）を使
つてマイクロコンピユーターにより演算し、得ら
れた演算値が一定になるように第４図による塩素
注入コントロールを行つた。（尚、塩素注入から
光学センサーまでのパルプ滞留時間は６秒であ
る）28日間の連続操業の結果、塩素塔出口の白色
度の標準偏差σは1.25（サンプル数ｎ＝158）であ
つた。又、この間暴走や過剰塩素現象は皆無で、
この間の設定変更回数は36回で、１日当り1.3回
であつた。Example 2 In the same chlorine bleaching process for unbleached pulp as in Example 1, the signal of an optical sensor with a correction processing device that corrects the effects of pulp flow rate and temperature, the pulp flow rate, and the chlorine injection amount were combined as a function (second (broken line in the figure) was calculated by a microcomputer, and chlorine injection control was performed according to Figure 4 so that the calculated value obtained was constant. (The pulp residence time from chlorine injection to the optical sensor is 6 seconds.) As a result of 28 days of continuous operation, the standard deviation σ of the whiteness at the outlet of the chlorine tower was 1.25 (number of samples n = 158). Also, there was no runaway or excessive chlorine phenomenon during this time.
During this period, the settings were changed 36 times, or 1.3 times per day.
対象例
実施例１と同じ未漂白パルプの塩素漂白工程
で、パルプ流量、温度の影響を補正する補正処理
装置付きの光学センサーの信号が第３図に示す如
く一定になるように第５図による塩素注入コント
ロールを行つた。（尚、塩素注入から光学センサ
ーまでのパルプ滞留時間は６秒である）28日間の
連続操業の結果、塩素塔出口の白色度の標準変差
σは2.45（サンプル数ｎ＝157）であつた。又、こ
の間の設定変更回数は123回、日当り4.4回であつ
た。Target example: In the same chlorine bleaching process of unbleached pulp as in Example 1, the signal of the optical sensor with a correction processing device that corrects the influence of pulp flow rate and temperature is as shown in Fig. 5 so that it becomes constant as shown in Fig. 3. Chlorine injection control was performed. (The pulp residence time from chlorine injection to the optical sensor is 6 seconds.) As a result of 28 days of continuous operation, the standard deviation σ of the whiteness at the outlet of the chlorine tower was 2.45 (number of samples n = 157). . Also, the number of settings changes during this period was 123 times, or 4.4 times per day.
第１図及び第２図は、各種未漂白パルプの漂白
につき本発明の塩素添加率制御方式を示す座標図
である。第３図は、各種未漂白パルプの漂白につ
き従来法の塩素添加率制御方式を示す座標図であ
る。第４図は、光学センサーによる本発明の塩素
添加率制御システム図である。第５図は、光学セ
ンサーによる従来法の塩素添加率制御システム図
である。
１……未晒パルプスラリー、２……未晒パルプ
流量調節弁、３……未晒パルプ流量計、４……ス
タテイツクミキサー、５……光学センサー、６…
…塩素ガス流量調節弁、７……塩素ガス流量計、
８……塩素ガス、９……未晒パルプ流量調節計、
１０……光学ユニツト調節計、１１……マイクロ
コンピユーター調節計、１２……塩素漂白塔、１
３……塩素漂白ずみパルプ。
1 and 2 are coordinate diagrams showing the chlorine addition rate control method of the present invention for bleaching various unbleached pulps. FIG. 3 is a coordinate diagram showing a conventional chlorine addition rate control method for bleaching various unbleached pulps. FIG. 4 is a diagram of the chlorine addition rate control system of the present invention using an optical sensor. FIG. 5 is a diagram of a conventional chlorine addition rate control system using an optical sensor. 1... Unbleached pulp slurry, 2... Unbleached pulp flow rate control valve, 3... Unbleached pulp flow meter, 4... Static mixer, 5... Optical sensor, 6...
...Chlorine gas flow rate control valve, 7...Chlorine gas flow meter,
8...Chlorine gas, 9...Unbleached pulp flow rate controller,
10...Optical unit controller, 11...Microcomputer controller, 12...Chlorine bleaching tower, 1
3... Chlorine bleached pulp.
Claims (1)
におけるパルプの白色度又は色調を光学的に検出
し、塩素注入量を制御する方法において、少なく
とも光学センサーの検出信号とパルプ当りの塩素
添加率又は添加量の２変数、または少なくとも光
学センサーの検出信号とパルプ流量及び塩素注入
量の３変数からなる関数での演算値が一定となる
ように塩素の注入量を制御する方法。 （但し、上記関数というのは、関数の演算値と塩
素反応終了後のパルプ白色度との相関が、光学セ
ンサーの検出信号と塩素反応終了後のパルプ白色
度との相関よりも高くなるように選ばれた関数を
意味し、且つＸ、Ｙ座標のＸ軸に対パルプ当りの
演算添加率又は添加量を、Ｙ軸に光学センサーの
検出信号をとつた場合、Ｘ、Ｙ以外の変数と関数
の演算値とが一定の時のＸ、Ｙの関数がＸ、Ｙ座
標上で右下がりの直線又は曲線となるような関数
である。なお、Ｘ軸は右方向がプラス、Ｙ軸は上
方向がプラスとする。）[Claims] 1. A method for controlling the amount of chlorine injection by optically detecting the whiteness or color tone of the pulp in a line immediately after chlorine injection in a pulp bleaching process, at least the detection signal of an optical sensor and the per-pulp A method for controlling the amount of chlorine added so that the calculated value is constant as a function of two variables, the rate or amount of chlorine added, or at least three variables: the detection signal of the optical sensor, the pulp flow rate, and the amount of chlorine added. (However, the above function is such that the correlation between the calculated value of the function and the pulp whiteness after the chlorine reaction is higher than the correlation between the detection signal of the optical sensor and the pulp whiteness after the chlorine reaction is completed. It means the selected function, and when the calculated addition rate or addition amount per pulp is taken on the X axis of the X, Y coordinates, and the detection signal of the optical sensor is taken on the Y axis, variables and functions other than X and Y When the calculated value of is constant, the X, Y function is a function that becomes a straight line or curved line downward to the right on the X, Y coordinates.The right direction of the X axis is positive, and the upward direction of the Y axis. is considered a plus.)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14016084A JPS6119896A (en) | 1984-07-05 | 1984-07-05 | Control of chlorine addition in pulp bleaching process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14016084A JPS6119896A (en) | 1984-07-05 | 1984-07-05 | Control of chlorine addition in pulp bleaching process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6119896A JPS6119896A (en) | 1986-01-28 |
| JPH0380917B2 true JPH0380917B2 (en) | 1991-12-26 |
Family
ID=15262266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14016084A Granted JPS6119896A (en) | 1984-07-05 | 1984-07-05 | Control of chlorine addition in pulp bleaching process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6119896A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0752495Y2 (en) * | 1987-03-26 | 1995-11-29 | 三菱重工業株式会社 | Air conditioner |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI47786C (en) * | 1972-02-28 | 1974-03-11 | Neste Oy | Method for automatic control of a bleaching process for cellulose. |
| JPS5920799B2 (en) * | 1974-07-17 | 1984-05-15 | セントロウル・システイムズ・リミテイド | Bleaching method and bleach addition control device |
-
1984
- 1984-07-05 JP JP14016084A patent/JPS6119896A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6119896A (en) | 1986-01-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |