JPH05186991A - Method for bleaching cellulose pulp - Google Patents

Method for bleaching cellulose pulp

Info

Publication number
JPH05186991A
JPH05186991A JP1947592A JP1947592A JPH05186991A JP H05186991 A JPH05186991 A JP H05186991A JP 1947592 A JP1947592 A JP 1947592A JP 1947592 A JP1947592 A JP 1947592A JP H05186991 A JPH05186991 A JP H05186991A
Authority
JP
Japan
Prior art keywords
pulp
cellulose pulp
bleaching
acid
cellulose
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
Application number
JP1947592A
Other languages
Japanese (ja)
Inventor
Hiroshi Mukoya
尋史 向谷
Hiroshi Itayama
博 板山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Chemical Industries Ltd
Original Assignee
Sanyo Chemical Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Chemical Industries Ltd filed Critical Sanyo Chemical Industries Ltd
Priority to JP1947592A priority Critical patent/JPH05186991A/en
Publication of JPH05186991A publication Critical patent/JPH05186991A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To bleach pulp useful as a packing material, etc., having excellent strength, bleaching degree and productivity without causing environmental problems such as waste water by treating an alkali water slurry of cellulose pulp with an oxygen gas, etc., in the presence of a specific fatty acid under a mild condition. CONSTITUTION:An alkali water slurry of cellulose pulp is treated with an oxygen gas and/or a peroxide in the presence of preferably 0.001-10wt.% (based on oven dry weight) compound selected from a group consisting of Turkey red oil, a natural oil as raw material for Turkey red oil and a fatty acid (e.g. ricinoleic acid, oleic acid or linoleic acid) purified from the natural oil to bleach cellulose pulp.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はセルロースパルプの漂白
方法に関する。
FIELD OF THE INVENTION The present invention relates to a method for bleaching cellulose pulp.

【0002】[0002]

【従来の技術】セルロースパルプは多くの用途がある
が、クラフトパルプでの包装資材のような白度を要求さ
れない用途を除いては、通常、塩素、次亜塩素酸、酸
素、過酸化水素等を用いて漂白する必要がある。近年塩
素系漂白は、生成する廃水等の公害問題等から酸素漂白
への変更が検討されている。しかし酸素漂白はパルプの
白色度が上がらず、また高圧酸素を使用すれば白色度は
向上するがセルロースの解重合が促進されパルプの強度
が低下する。従来、酸素漂白時に助剤を添加し効率を向
上させる方法(例えば特開昭50−94202号公報)
や酸素漂白時に助剤を添加し次いで次亜塩素酸で処理す
る方法(特開昭59−179892号公報)等が提案さ
れている。
2. Description of the Related Art Cellulose pulp has many uses, but normally, chlorine, hypochlorous acid, oxygen, hydrogen peroxide, etc. are used except for applications where whiteness is not required, such as packaging materials for kraft pulp. Need to be bleached with. In recent years, chlorine-based bleaching is being considered for change to oxygen bleaching due to pollution problems such as generated wastewater. However, oxygen bleaching does not increase the whiteness of the pulp, and the use of high-pressure oxygen improves the whiteness but accelerates the depolymerization of cellulose and reduces the strength of the pulp. Conventionally, a method of improving the efficiency by adding an auxiliary agent during oxygen bleaching (for example, JP-A-50-94202).
A method has been proposed in which an auxiliary agent is added during oxygen bleaching and then treated with hypochlorous acid (JP-A-59-179892).

【0003】[0003]

【発明が解決しようとする課題】しかしながら、これら
の方法は酸素漂白でのパルプの白色度と強度が不十分で
ある。
However, these methods have insufficient whiteness and strength of pulp in oxygen bleaching.

【0004】[0004]

【課題を解決するための手段】本発明者らは、上記の問
題点を解決すべく鋭意検討した結果、本発明に到達し
た。即ち、本発明はセルロースパルプのアルカリ性水ス
ラリーを、酸素ガスおよび/または過酸化物で処理する
方法において、ロート油(a1)、(a1)の原料とな
る天然油(a2)および(a2)から精製される脂肪酸
(a3)からなる群より選ばれる化合物(A)1種以上
の存在下で処理することを特徴とするセルロースパルプ
の漂白方法である。
The present inventors have arrived at the present invention as a result of intensive studies to solve the above problems. That is, the present invention is a method of treating an alkaline water slurry of cellulose pulp with oxygen gas and / or peroxide, in which the funnel oils (a1), natural oils (a2) and (a2) as raw materials of (a1) are used. A method for bleaching cellulose pulp, which comprises treating in the presence of at least one compound (A) selected from the group consisting of fatty acids (a3) to be purified.

【0005】本発明において、ロート油(a1)とは
(a2)のうち主としてひまし油を硫酸化した化合物で
あり、(a1)の原料となる天然油(a2)としてはひ
まし油、オリーブ油、綿実油、魚油等が挙げられ、(a
2)から精製される脂肪酸(a3)としては、リシノー
ル酸、オレイン酸、リノール酸、パルミチン酸、ステア
リン酸等が挙げられる。これらのうち、好ましいものは
ロート油、リノール酸である。
In the present invention, the funnel oil (a1) is a compound of (a2) obtained by sulfating castor oil, and the natural oil (a2) as the raw material of (a1) is castor oil, olive oil, cottonseed oil, fish oil. Etc., (a
Examples of the fatty acid (a3) purified from 2) include ricinoleic acid, oleic acid, linoleic acid, palmitic acid, and stearic acid. Of these, preferred are funnel oil and linoleic acid.

【0006】本発明において、(A)の添加量は、漂白
後の白色度に対する要求等により一律には決められない
為限定するものではないが、通常パルプ懸濁液に対して
絶乾パルプ重量当り0.001〜10重量%である。添加量
が、0.001重量%未満であると十分な効果が得られず、1
0重量%を越えても漂白効果が平衡に達する。
[0006] In the present invention, the amount of (A) added is not limited because it cannot be uniformly determined due to requirements for whiteness after bleaching, etc. It is 0.001 to 10% by weight. If the addition amount is less than 0.001% by weight, a sufficient effect cannot be obtained.
The bleaching effect reaches equilibrium even if it exceeds 0% by weight.

【0007】また、(A)とともに、マグネシウム化合
物等のアルカリ土類金属塩、キレート剤等のセルロース
の重合度の低下を防止する薬剤、または縮合リン酸塩、
珪酸塩等の過酸化物漂白における安定化剤等とを併用し
てもよい。
Further, together with (A), an alkaline earth metal salt such as a magnesium compound, a chemical agent such as a chelating agent for preventing a decrease in the degree of polymerization of cellulose, or a condensed phosphate salt,
You may use together with a stabilizer etc. in peroxide bleaching, such as a silicate.

【0008】本発明の方法の対象となるセルロース含有
材料はGP(砕木パルプ)、RMP(リファイナーメカ
ニカルパルプ)、TMP(サーモメカニカルパルプ)、
CGP(ケミグラウンドパルプ)、SCP(セミケミカ
ルパルプ)、SP(サルファイトパルプ)、KP(クラ
フトパルプ)、AP(アルカリパルプ)、古紙パルプ等
であり木材(針葉樹、広葉樹)、非木材(草本類)パル
プいずれにも実施可能である。また、セルロース含有材
料のスラリー濃度は低濃度(10重量%未満)、中濃度
(10〜20重量%)、高濃度(20重量%以上)のい
ずれにも実施可能である。
The cellulose-containing material which is the object of the method of the present invention is GP (ground wood pulp), RMP (refiner mechanical pulp), TMP (thermomechanical pulp),
CGP (chemiground pulp), SCP (semi-chemical pulp), SP (sulfite pulp), KP (kraft pulp), AP (alkali pulp), waste paper pulp, etc. are wood (softwood, hardwood), non-wood (herbs) ) It can be applied to any pulp. Further, the concentration of the slurry of the cellulose-containing material may be low (less than 10% by weight), medium (10 to 20% by weight), or high (20% by weight or more).

【0009】本発明の方法に使用されるアルカリ性媒体
は、水酸化ナトリウム、炭酸ナトリウム、炭酸水素ナト
リウム、アンモニア、クラフト法白液、酸化白液、緑
液、酸化緑液、四ホウ酸ナトリウム、メタホウ酸ナトリ
ウム等が使用できるが、通常水酸化ナトリウムを使用す
る。絶乾パルプ重量当りのアルカリ添加量はNa2O換
算で0.5〜3重量%が好ましい。
The alkaline medium used in the method of the present invention is sodium hydroxide, sodium carbonate, sodium hydrogencarbonate, ammonia, Kraft white liquor, white liquor, green liquor, green liquor, sodium tetraborate, and metaborate. Sodium acid or the like can be used, but sodium hydroxide is usually used. The amount of alkali added per absolute dry pulp weight is preferably 0.5 to 3% by weight in terms of Na 2 O.

【0010】本発明の方法に使用される酸素としては、
酸素および酸素富化空気のいずれもが使用可能である
が、反応容器の容積、および反応効率を考慮して酸素ガ
スを使用するのが好ましい。また酸素の圧力は、高圧
(10Kg/cm2G以上)から低圧(10Kg/cm2G未満)まで
使用できるが本発明の効果を最大に発揮するには比較的
低圧(1〜5Kg/cm2G)で実施する方が好ましい。
The oxygen used in the method of the present invention includes:
Both oxygen and oxygen-enriched air can be used, but it is preferable to use oxygen gas in consideration of the volume of the reaction vessel and the reaction efficiency. The pressure of the oxygen pressure (10 Kg / cm 2 or more G) from to a low pressure (10 Kg / cm less than 2 G) can be used but relatively low pressure to exert the maximum effect of the present invention (1-5 kg / cm 2 It is preferable to carry out in step G).

【0011】本発明の方法は、好適には酸素漂白工程で
実施されるが蒸解途中、蒸解後等のいずれの段階でも実
施可能である。
The method of the present invention is preferably carried out in an oxygen bleaching step, but can be carried out at any stage during or after cooking.

【0012】本発明の方法に使用される漂白装置は、縦
型、横型等の反応装置のいずれも使用可能である。
(A)の添加方法はアップフロー方式の漂白塔の塔底か
ら、或いはセルロース含有材料が酸素ガスおよび/また
は過酸化物と混合される前、同時または後のいずれの時
期に添加してもよいが、攪拌効率の面から、混合される
と同時期か、混合される前が好ましい。また、通常、温
度は室温〜200℃、反応時間は30秒〜20時間で実
施する。
The bleaching apparatus used in the method of the present invention may be a vertical type or a horizontal type reaction apparatus.
The addition method of (A) may be from the bottom of an upflow bleaching tower or at any time before, simultaneously with or after the cellulose-containing material is mixed with oxygen gas and / or peroxide. However, from the viewpoint of stirring efficiency, it is preferable to be at the same time as before mixing or before mixing. The temperature is usually room temperature to 200 ° C., and the reaction time is 30 seconds to 20 hours.

【0013】[0013]

【実施例】以下実施例により本発明を更に説明するが、
本発明はこれに限定されるものではない。実施例に用い
たパルプは広葉樹クラフトパルプ(カッパー価20.
0、パルプ粘度26.0)であり、表中の%は重量%を
示す。漂白度の一指標であるカッパー価および、セルロ
ース強度の一指標である粘度の測定法は下記のとおりで
ある。なお、カッパー価は小さいほど漂白度が高く、粘
度は高いほどセルロース強度が高い。 カッパー価測定法:パルプのカッパー価測定法(TAPPI
T236-m-60) 粘度測定法 :銅エチレンジアミンを溶媒として用
いるパルプの粘度測定法(TAPPI T230-su-66)
The present invention will be further described with reference to the following examples.
The present invention is not limited to this. The pulp used in the examples is a hardwood kraft pulp (Kappa number 20.
0, pulp viscosity 26.0), and% in the table indicates% by weight. The kappa number, which is an index of bleaching degree, and the viscosity, which is an index of cellulose strength, are measured as follows. The smaller the Kappa number, the higher the bleaching degree, and the higher the viscosity, the higher the cellulose strength. Kappa number measurement method: Pulp kappa number measurement method (TAPPI
T236-m-60) Viscosity measurement method: Pulp viscosity measurement method using copper ethylenediamine as solvent (TAPPI T230-su-66)

【0014】実施例1〜6、および比較例1〜2 絶乾パルプに苛性ソーダ水溶液(苛性ソーダ量は、Na
2O換算で絶乾パルプ重量当り3%)および表1に示す
(A)を添加し、室温下ニーダーにて10分間混練し、
パルプスラリーを調製した。これをオートクレーブに入
れ、酸素ガスで充分置換した後、酸素圧3Kg/cm2G、温
度110℃に保ち30分反応させた。反応終了後、酸素
圧を解き、オートクレーブからパルプスラリーを取り出
し、蒸留水で十分洗浄し、ろ過後、乾燥させ漂白パルプ
を得た。得られたパルプのカッパー価と粘度を表1に示
す。
Examples 1 to 6 and Comparative Examples 1 to 2 An absolutely dry caustic soda solution (the amount of caustic soda is Na
3% based on absolute dry pulp weight ( 2 O) and (A) shown in Table 1 were added and kneaded in a kneader at room temperature for 10 minutes,
A pulp slurry was prepared. This was placed in an autoclave and sufficiently replaced with oxygen gas, and then the reaction was carried out for 30 minutes while maintaining the oxygen pressure at 3 kg / cm 2 G and the temperature at 110 ° C. After completion of the reaction, the oxygen pressure was released, the pulp slurry was taken out from the autoclave, sufficiently washed with distilled water, filtered and dried to obtain a bleached pulp. Table 1 shows the Kappa number and viscosity of the obtained pulp.

【0015】[0015]

【表1】 *1:リノール酸 *2:ロート油H *3:絶乾パルプ重量当りの添加量[Table 1] * 1: Linoleic acid * 2: Funnel oil H * 3: Addition amount per weight of absolutely dry pulp

【0016】[0016]

【発明の効果】本発明のセルロースパルプの漂白方法は
次の様な効果を奏する。 (1)パルプ濃度に関わらず、漂白効果が大きい。 (2)温和な漂白条件で実施出来る。 (3)製品の品質が安定する。 以上の効果を奏することから、本発明のセルロースパル
プ漂白方法は生産性を向上させる工業上有用なものであ
る。
The method for bleaching cellulose pulp of the present invention has the following effects. (1) The bleaching effect is great regardless of pulp concentration. (2) It can be performed under mild bleaching conditions. (3) Product quality is stable. Due to the above effects, the cellulose pulp bleaching method of the present invention is industrially useful for improving productivity.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 セルロースパルプのアルカリ性水スラリ
ーを、酸素ガスおよび/または過酸化物で処理する方法
において、ロート油(a1)、(a1)の原料となる天
然油(a2)および(a2)から精製される脂肪酸(a
3)からなる群より選ばれる化合物(A)1種以上の存
在下で処理することを特徴とするセルロースパルプの漂
白方法。
1. A method for treating an alkaline water slurry of cellulose pulp with oxygen gas and / or peroxide, wherein the funnel oils (a1), natural oils (a2) and (a2) as raw materials of (a1) are used. Fatty acid to be purified (a
A method for bleaching cellulose pulp, which comprises treating in the presence of at least one compound (A) selected from the group consisting of 3).
JP1947592A 1992-01-07 1992-01-07 Method for bleaching cellulose pulp Pending JPH05186991A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1947592A JPH05186991A (en) 1992-01-07 1992-01-07 Method for bleaching cellulose pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1947592A JPH05186991A (en) 1992-01-07 1992-01-07 Method for bleaching cellulose pulp

Publications (1)

Publication Number Publication Date
JPH05186991A true JPH05186991A (en) 1993-07-27

Family

ID=12000360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1947592A Pending JPH05186991A (en) 1992-01-07 1992-01-07 Method for bleaching cellulose pulp

Country Status (1)

Country Link
JP (1) JPH05186991A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007515570A (en) * 2003-12-23 2007-06-14 ケミラ オサケ ユキチュア ユルキネン Method for reducing color reversion of mechanical pulp and high yield chemical pulp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007515570A (en) * 2003-12-23 2007-06-14 ケミラ オサケ ユキチュア ユルキネン Method for reducing color reversion of mechanical pulp and high yield chemical pulp

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