JP2019026958A - Method for promoting defibration of used paper pulp - Google Patents
Method for promoting defibration of used paper pulp Download PDFInfo
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- JP2019026958A JP2019026958A JP2017147004A JP2017147004A JP2019026958A JP 2019026958 A JP2019026958 A JP 2019026958A JP 2017147004 A JP2017147004 A JP 2017147004A JP 2017147004 A JP2017147004 A JP 2017147004A JP 2019026958 A JP2019026958 A JP 2019026958A
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- disaggregation
- monochloramine
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- 238000000034 method Methods 0.000 title claims abstract description 58
- 230000001737 promoting effect Effects 0.000 title claims abstract description 25
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 23
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000004480 active ingredient Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000007864 aqueous solution Substances 0.000 claims description 29
- 239000000460 chlorine Substances 0.000 claims description 27
- 229910052801 chlorine Inorganic materials 0.000 claims description 27
- 239000010893 paper waste Substances 0.000 claims description 27
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- 102000006835 Lamins Human genes 0.000 claims description 2
- 108010047294 Lamins Proteins 0.000 claims description 2
- 210000005053 lamin Anatomy 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 45
- 239000000123 paper Substances 0.000 description 27
- 239000013055 pulp slurry Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 16
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000243 solution Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 239000005708 Sodium hypochlorite Substances 0.000 description 7
- 239000000428 dust Substances 0.000 description 7
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 150000003863 ammonium salts Chemical class 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 229940079593 drug Drugs 0.000 description 4
- 239000008267 milk Substances 0.000 description 4
- 210000004080 milk Anatomy 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 3
- 239000002761 deinking Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 239000004254 Ammonium phosphate Substances 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- 235000019289 ammonium phosphates Nutrition 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000001139 pH measurement Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- -1 phosphate ester Chemical class 0.000 description 1
- SATVIFGJTRRDQU-UHFFFAOYSA-N potassium hypochlorite Chemical compound [K+].Cl[O-] SATVIFGJTRRDQU-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000004383 yellowing Methods 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
Abstract
Description
本開示は、古紙パルプの離解促進方法、及びそれに用いる古紙パルプ離解促進剤に関する。 The present disclosure relates to a method for promoting disintegration of used paper pulp, and a used paper pulp disintegration accelerator used therefor.
近年、森林資源保護やごみ処理等の環境問題等の立場から、印刷古紙の再利用が重要性を増している。古紙パルプは、回収された古紙をパルパーで離解処理した後、フローテーターで脱墨処理することを含むＤＩＰ工程によってパルプ繊維を採取し、それを抄紙すること等により製造される。図１に、古紙パルプの製造工程の一例を示す。図１に示す古紙パルプの製造工程は、パルパー１１による離解処理と、クリーナー１２及びスクリーン１３による除塵処理と、フローテーター１４による脱墨処理とを含む。パルパー１１においてほぐされた古紙はスラリー状となり、得られたパルプスラリーはクリーナー１２及びスクリーン１３において異物が除去され、ついでフローテーター１４においてパルプに付着したインクが剥離除去される。 In recent years, the reuse of waste printed paper has become increasingly important from the standpoint of environmental issues such as forest resource protection and waste disposal. Waste paper pulp is produced by collecting pulp fibers by a DIP process including deinking treatment of collected recovered paper with a pulper and then deinking with a floatator, and making paper. In FIG. 1, an example of the manufacturing process of waste paper pulp is shown. 1 includes a disaggregation process by the pulper 11, a dust removal process by the cleaner 12 and the screen 13, and a deinking process by the flowator 14. Waste paper loosened in the pulper 11 becomes a slurry, and foreign matter is removed from the obtained pulp slurry in the cleaner 12 and the screen 13, and then the ink attached to the pulp is peeled off in the flowator 14.
離解処理は、古紙パルプの製造工程における最初のプロセスであり、離解が十分でないと、最終的に得られる古紙パルプの品質や製造効率等に大きな影響を及ぼしうる重要な工程である。このため、離解処理を促進するための様々な方法が提案されている。離解処理を促進する方法としては、例えば、水酸化ナトリウム等のアルカリ剤や、次亜塩素酸塩及び過酸化水素等の酸化剤、並びにリン酸エステル等の薬剤を使用する方法がある（例えば、特許文献１及び２等）。 The disaggregation process is the first process in the used paper pulp manufacturing process, and if the disaggregation is not sufficient, it is an important process that can greatly affect the quality and manufacturing efficiency of the finally obtained used paper pulp. For this reason, various methods for promoting disaggregation processing have been proposed. Examples of the method for promoting the disaggregation treatment include a method using an alkali agent such as sodium hydroxide, an oxidizing agent such as hypochlorite and hydrogen peroxide, and a chemical agent such as phosphate ester (for example, Patent Documents 1 and 2, etc.).
近年、紙は様々な加工がなされており、古紙パルプの原料となる古紙には様々な物質が含まれている。このため、従来の方法では、十分に離解することができないという問題がある。 In recent years, paper has been variously processed, and waste paper used as a raw material for waste paper pulp contains various substances. For this reason, there is a problem that the conventional method cannot be sufficiently disaggregated.
そこで、本開示は、一態様において、古紙の離解処理効率を向上可能な新たな方法及びそれに用いる薬剤を提供する。 Therefore, in one aspect, the present disclosure provides a new method capable of improving the disaggregation efficiency of waste paper and a drug used therefor.
本開示は、一態様において、古紙パルプ製造工程のパルパーにおける離解処理を促進する方法であって、モノクロラミン及びモノブロラミンの少なくとも一方を含む処理液中で、前記離解処理を行うことを含む、離解促進方法に関する。 In one aspect, the present disclosure is a method for promoting disaggregation processing in a pulper in a used paper pulp manufacturing process, which includes performing the disaggregation treatment in a treatment liquid containing at least one of monochloramine and monobrolamin. It relates to the promotion method.
本開示は、その他の態様において、モノクロラミン及びモノブロラミンの少なくとも一方を有効成分とする、古紙の離解処理を促進するための離解促進剤に関する。 In another aspect, the present disclosure relates to a disaggregation accelerator for promoting disaggregation processing of waste paper, which contains at least one of monochloramine and monobrolamin as an active ingredient.
本開示によれば、古紙パルプ製造工程のパルパーにおける離解処理の処理効率を向上することができる。 According to this indication, the processing efficiency of the disaggregation process in the pulper of a used paper pulp manufacturing process can be improved.
本開示は、一又は複数の実施形態において、古紙の離解処理を、モノクロラミン及びモノブロラミンの少なくとも一方の存在下で行うことによって、従来離解処理剤として使用されている酸化力の高い次亜塩素酸ナトリウムや、強アルカリである水酸化ナトリウムの存在下で行った場合と比較して、古紙を十分にほぐすことができ、離解効率を向上できるという知見に基づく。本開示の離解促進方法は、古紙パルプの製造工程において、古紙の離解処理を促進することを目的として、モノクロラミン及びモノブロラミンの少なくとも一方を使用することを特徴とする。 In one or a plurality of embodiments of the present disclosure, the present invention discloses a hypochlorite having a high oxidizing power that is conventionally used as a disaggregation treatment agent by performing a disaggregation treatment of waste paper in the presence of at least one of monochloramine and monobrolamin. This is based on the knowledge that waste paper can be sufficiently loosened and disaggregation efficiency can be improved as compared with the case where it is carried out in the presence of sodium hydroxide or sodium hydroxide which is a strong alkali. The disaggregation promoting method of the present disclosure is characterized by using at least one of monochloramine and monobrolamin for the purpose of promoting the disaggregation treatment of waste paper in the waste paper pulp manufacturing process.
本開示の方法によって、古紙を十分にほぐすことができ、離解効率を向上できるメカニズムの詳細は明らかではないが、以下のように推定される。
モノクロラミン及びモノブロラミンは、次亜塩素酸ナトリウムと比較して酸化力は高くない。しかしながら、モノクロラミン及びモノブロラミンは、古紙への浸透性が高く、それにより古紙がパルパー内の処理液になじみやすくなる。その結果、古紙が離解されやすくなり、離解効率が向上されると考えられる。但し、本開示は、このメカニズムに限定されなくてもよい。
Although details of the mechanism that can sufficiently loosen the used paper and improve the disaggregation efficiency by the method of the present disclosure are not clear, it is estimated as follows.
Monochloramine and monobromine are not highly oxidative compared to sodium hypochlorite. However, monochloramine and monobrolamin have high penetrability into used paper, which makes the used paper easily compatible with the treatment liquid in the pulper. As a result, it is considered that waste paper is easily disaggregated and the disaggregation efficiency is improved. However, the present disclosure may not be limited to this mechanism.
本開示によれば、一又は複数の実施形態において、離解処理時に使用するアルカリ剤の量を低減することができ、さらにはアルカリ剤を使用しない場合であっても、古紙を十分に離解することができるという効果を奏しうる。本開示によれば、一又は複数の実施形態において、得られる古紙パルプの白色度を向上できるという効果を奏しうる。 According to the present disclosure, in one or a plurality of embodiments, it is possible to reduce the amount of the alkaline agent used at the time of the disaggregation treatment, and further sufficiently disaggregate the used paper even when the alkali agent is not used. The effect of being able to be able to be produced. According to the present disclosure, in one or a plurality of embodiments, the whiteness of the obtained waste paper pulp can be improved.
本開示において「モノクロラミン」とは、結合塩素（結合型残留塩素）の一種であって、ＮＨ2Ｃｌで表される化合物（アンモニアの水素原子のうち１つを塩素原子で置き換えた化合物）をいう。本開示において「モノブロラミン」とは、結合臭素の一種であって、ＮＨ2Ｂｒで表される化合物（アンモニアの水素原子のうち１つを臭素原子で置き換えた化合物）をいう。モノクロラミン及びモノブロラミンは、一又は複数の実施形態において、次亜塩素酸塩とアンモニウム塩とを混合することにより生成できる。 In the present disclosure, “monochloramine” is a kind of bonded chlorine (bonded residual chlorine), which is a compound represented by NH 2 Cl (a compound in which one of ammonia hydrogen atoms is replaced by a chlorine atom). Say. In the present disclosure, “monobrolamin” is a kind of bonded bromine and represents a compound represented by NH 2 Br (a compound in which one of the hydrogen atoms of ammonia is replaced with a bromine atom). Monochloramine and monobromine can be produced in one or more embodiments by mixing hypochlorite and ammonium salts.
本開示において「離解処理を促進する」ことは、一又は複数の実施形態において、本開示の実施例のように、ほぐれ具合を目視で確認してもよいし、離解処理後の残渣の量で確認してもよい。離解処理を促進することとしては、一又は複数の実施形態において、離解率を向上できること、離解処理後の残渣の量を低減できること、離解処理時に要する時間を短縮できること、又は、離解処理時における機械的負荷を低減できること等が挙げられる。 In the present disclosure, “promoting the disaggregation process” means that in one or a plurality of embodiments, as in the examples of the present disclosure, the degree of loosening may be visually confirmed, or the amount of residue after the disaggregation process. You may check. In promoting the disaggregation process, in one or more embodiments, the disaggregation rate can be improved, the amount of residue after the disaggregation process can be reduced, the time required for the disaggregation process can be shortened, or the machine during the disaggregation process And the like.
［離解促進方法］
本開示は、一態様において、古紙パルプ製造工程のパルパーにおける離解処理を促進する方法（本開示の離解促進方法）に関する。本開示の離解促進方法は、古紙パルプ製造工程のパルパーにおける離解処理を、モノクロラミン及びモノブロラミンの少なくとも一方の存在下で行うことを含む。
[Disaggregation promotion method]
In one aspect, the present disclosure relates to a method of promoting disaggregation processing in a pulper in a used paper pulp manufacturing process (disaggregation promoting method of the present disclosure). The disaggregation promotion method of this indication includes performing the disaggregation process in the pulper of a used paper pulp manufacturing process in presence of at least one of a monochloramine and a monobrolamin.
離解処理をモノクロラミン及びモノブロラミンの少なくとも一方の存在下で行うこととしては、一又は複数の実施形態において、モノクロラミン及びモノブロラミンの少なくとも一方を含む処理液中で、古紙の離解処理を行うことが挙げられる。モノクロラミン及びモノブロラミンの少なくとも一方を含む処理液としては、離解処理効率を向上させる点から、一又は複数の実施形態において、処理液におけるモノクロラミン及びモノブロラミンの合計の濃度が、残留塩素量として０．５ｍｇ／Ｌ以上、１ｍｇ／Ｌ以上、３ｍｇ／Ｌ以上若しくは５ｍｇ／Ｌ以上であり、又は３０ｍｇ／Ｌ以下、２５ｍｇ／Ｌ以下、２０ｍｇ／Ｌ以下又は１５ｍｇ／Ｌ以下であることが挙げられる。残留塩素量は、実施例に記載の方法により測定できる。 As the disaggregation treatment in the presence of at least one of monochloramine and monobrolamin, in one or more embodiments, the disintegration treatment of waste paper is performed in a treatment liquid containing at least one of monochloramine and monobrolamin. Is mentioned. As the treatment liquid containing at least one of monochloramine and monobrolamin, from the viewpoint of improving the disaggregation treatment efficiency, in one or a plurality of embodiments, the total concentration of monochloramine and monobrolamin in the treatment liquid is the residual chlorine amount. It is 0.5 mg / L or more, 1 mg / L or more, 3 mg / L or more, or 5 mg / L or more, or 30 mg / L or less, 25 mg / L or less, 20 mg / L or less, or 15 mg / L or less. . The amount of residual chlorine can be measured by the method described in the examples.
本開示の離解促進方法は、離解処理効率を向上させる点から、一又は複数の実施形態において、処理液におけるモノクロラミン及びモノブロラミンの合計の濃度が、残留塩素量として３ｍｇ／Ｌ〜１５ｍｇ／Ｌとなるように、モノクロラミン及びモノブロラミンの少なくとも一方を含む水溶液又はモノクロラミン及びモノブロラミンの少なくとも一方を生成しうる薬剤をパルパーに添加することを含む。 In the disaggregation promoting method of the present disclosure, from the viewpoint of improving the disaggregation processing efficiency, in one or a plurality of embodiments, the total concentration of monochloramine and monobromine in the treatment liquid is 3 mg / L to 15 mg / L as the amount of residual chlorine. So that an aqueous solution containing at least one of monochloramine and monobrolamin or an agent capable of producing at least one of monochloramine and monobrolamin is added to the pulper.
モノクロラミン及びモノブロラミンは、一又は複数の実施形態において、次亜塩素酸塩とアンモニウム塩とを混合することにより生成できる。モノクロラミン及びモノブロラミンの少なくとも一方を生成しうる薬剤としては、一又は複数の実施形態において、次亜塩素酸塩とアンモニウム塩とを含む薬剤等が挙げられる。次亜塩素酸塩としては、一又は複数の実施形態において、次亜塩素酸ナトリウム、次亜塩素酸カリウム及び次亜塩素酸カルシウム等が挙げられる。アンモニウム塩としては、一又は複数の実施形態において、塩化アンモニウム、臭化アンモニウム、リン酸アンモニウム、リン酸二水素アンモニウム、リン酸水素二アンモニウム、硫酸アンモニウム及び硝酸アンモニウム等が挙げられる。次亜塩素酸塩とアンモニウム塩とのモル比は、一又は複数の実施形態において、残留塩素と窒素とのモル比として１：１〜１：２、１：１．１〜１：２、１：１．２〜１：２、又は１：１．２〜１：１．６である。 Monochloramine and monobromine can be produced in one or more embodiments by mixing hypochlorite and ammonium salts. Examples of the drug capable of generating at least one of monochloramine and monobrolamin include a drug containing hypochlorite and ammonium salt in one or a plurality of embodiments. Examples of hypochlorite include sodium hypochlorite, potassium hypochlorite, and calcium hypochlorite in one or more embodiments. Examples of the ammonium salt include ammonium chloride, ammonium bromide, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, ammonium sulfate, and ammonium nitrate in one or more embodiments. In one or more embodiments, the molar ratio of hypochlorite to ammonium salt is 1: 1 to 1: 2, 1: 1.1 to 1: 2, 1 as the molar ratio of residual chlorine to nitrogen. : 1.2 to 1: 2 or 1: 1.2 to 1: 1.6.
本開示の離解促進方法は、離解処理効率を向上させる点から、一又は複数の実施形態において、処理液におけるモノクロラミンの濃度が、残留塩素量として３ｍｇ／Ｌ〜１５ｍｇ／Ｌとなるように維持することを含む。 The disaggregation promoting method of the present disclosure is maintained so that the concentration of monochloramine in the treatment liquid is 3 mg / L to 15 mg / L as a residual chlorine amount in one or a plurality of embodiments from the viewpoint of improving the disaggregation processing efficiency. Including doing.
処理液のｐＨは、一又は複数の実施形態において、得られる古紙パルプの黄変等の変色や繊維の脆化を低減する観点から、１０未満であり、同様の観点及び離解処理効率向上の観点から、８．５以上１０未満である。本開示の離解促進方法は、一又は複数の実施形態において、パルパーのｐＨが８．５以上１０未満となるように調整することを含む。 In one or a plurality of embodiments, the pH of the treatment liquid is less than 10 from the viewpoint of reducing discoloration such as yellowing of the used waste paper pulp and fiber embrittlement, and the same viewpoint and the viewpoint of improving the disaggregation treatment efficiency From 8.5 to less than 10. In one or a plurality of embodiments, the disaggregation promoting method of the present disclosure includes adjusting the pH of the pulper to be 8.5 or more and less than 10.
パルパーでの離解処理における処理時間は、一又は複数の実施形態において、２分〜２０分又は２分〜１５分である。 In one or a plurality of embodiments, the processing time in the disaggregation process with the pulper is 2 minutes to 20 minutes or 2 minutes to 15 minutes.
処理液は、一又は複数の実施形態において、アルカリ剤を含んでいてもよい。離解処理は、一又は複数の実施形態において、モノクロラミン及びモノブロラミンの少なくとも一方と、アルカリ剤との存在下で行ってもよい。本開示の離解促進方法は、一又は複数の実施形態において、パルパーにアルカリ剤を添加することを含んでいてもよい。アルカリ剤としては、一又は複数の実施形態として、水酸化ナトリウム、水酸化カリウム、及び炭酸ナトリウム等が挙げられる。 In one or a plurality of embodiments, the treatment liquid may contain an alkaline agent. In one or a plurality of embodiments, the disaggregation treatment may be performed in the presence of at least one of monochloramine and monobrolamin and an alkaline agent. In one or a plurality of embodiments, the disaggregation promoting method of the present disclosure may include adding an alkali agent to the pulper. As an alkali agent, sodium hydroxide, potassium hydroxide, sodium carbonate, etc. are mentioned as one or some embodiment.
［離解促進剤］
本開示は、その他の態様において、モノクロラミン及びモノブロラミンの少なくとも一方を有効成分とする、古紙の離解処理を促進するための離解促進剤（本開示の離解促進剤）に関する。本開示の離解促進剤は、一又は複数の実施形態において、本開示の離解処理促進方法に使用することができる。
[Disaggregation accelerator]
In another aspect, the present disclosure relates to a disaggregation accelerator (disaggregation accelerator of the present disclosure) for promoting the disaggregation treatment of used paper, which contains at least one of monochloramine and monobrolamin as an active ingredient. The disaggregation promoter of this indication can be used for the disaggregation process promotion method of this indication in one or some embodiment.
本開示の離解促進剤は、一又は複数の実施形態において、モノクロラミン及びモノブロラミンの少なくとも一方を含む水溶液、並びにモノクロラミン及びモノブロラミンの少なくとも一方を生成しうる薬剤を含む。 In one or a plurality of embodiments, the disaggregation promoter of the present disclosure includes an aqueous solution containing at least one of monochloramine and monobrolamin, and an agent capable of producing at least one of monochloramine and monobromine.
本開示の離解促進剤の形態は、一又は複数の実施形態において、水溶液の形態が挙げられる。本開示の離解促進剤の添加濃度等は、上述の通りである。 As for the form of the disaggregation promoter of the present disclosure, in one or a plurality of embodiments, the form of an aqueous solution may be mentioned. The concentration of the disaggregation accelerator of the present disclosure is as described above.
本開示は、以下の一又は複数の実施形態に関しうる；
〔１〕 古紙パルプ製造工程のパルパーにおける離解処理を促進する方法であって、モノクロラミン及びモノブロラミンの少なくとも一方を含む処理液中で、前記離解処理を行うことを含む、離解促進方法。
〔２〕 前記処理液におけるモノクロラミン及びモノブロラミンの合計の濃度が残留塩素量として３ｍｇ／Ｌ〜１５ｍｇ／Ｌとなるように、前記パルパーに、モノクロラミン及びモノブロラミンの少なくとも一方を含む水溶液又はモノクロラミン及びモノブロラミンの少なくとも一方を生成しうる薬剤を添加することを含む、〔１〕に記載の離解促進方法。
〔３〕 前記処理液におけるモノクロラミン及びモノブロラミンの合計の濃度が、残留塩素量として３ｍｇ／Ｌ〜１５ｍｇ／Ｌとなるように維持することを含む、〔１〕又は〔２〕に記載の離解促進方法。
〔４〕 モノクロラミン及びモノブロラミンの少なくとも一方を有効成分とする、古紙の離解処理を促進するための離解促進剤。
The present disclosure may relate to one or more of the following embodiments;
[1] A method for promoting disaggregation treatment in a pulper in a used paper pulp manufacturing process, comprising performing the disaggregation treatment in a treatment liquid containing at least one of monochloramine and monobrolamin.
[2] An aqueous solution or monochrome containing at least one of monochloramine and monobromine in the pulper so that the total concentration of monochloramine and monobromine in the treatment liquid is 3 mg / L to 15 mg / L as the amount of residual chlorine. The disaggregation promoting method according to [1], comprising adding a drug capable of producing at least one of lamin and monobrolamin.
[3] The disaggregation according to [1] or [2], comprising maintaining the total concentration of monochloramine and monobrolamin in the treatment liquid to be 3 mg / L to 15 mg / L as the amount of residual chlorine. Promotion method.
[4] A disaggregation accelerator for promoting the disaggregation treatment of waste paper, comprising at least one of monochloramine and monobrolamin as an active ingredient.
以下、実施例及び比較例を用いて本開示をさらに説明する。ただし、本開示は以下の実施例に限定して解釈されない。 Hereinafter, this indication is further explained using an example and a comparative example. However, the present disclosure is not construed as being limited to the following examples.
［モノクロラミン水溶液の調製］
次亜塩素酸ナトリウム水溶液（残留塩素量：１４０ｇ／Ｌ）を脱イオン水で残留塩素量が２ｇ／Ｌになるように希釈した後、３０％硫酸アンモニウム水溶液（硫酸アンモニウム（キシダ化学（株）製）３０ｇを脱イオン水で溶解し、全量を１００ｇとしたもの）を混合し、残留塩素と窒素とのモル比が１：１．２となるようにモノクロラミン水溶液を調製した。
[Preparation of monochloramine aqueous solution]
After diluting a sodium hypochlorite aqueous solution (residual chlorine amount: 140 g / L) with deionized water so that the residual chlorine amount is 2 g / L, 30% ammonium sulfate aqueous solution (ammonium sulfate (Kishida Chemical Co., Ltd.) 30 g Was dissolved in deionized water and the total amount was 100 g), and a monochloramine aqueous solution was prepared so that the molar ratio of residual chlorine to nitrogen was 1: 1.2.
（実施例１）
［ミルクカートンを用いた離解効果確認試験］
現場で採取したミルクカートン古紙を約２〜４ｃｍ四方の紙片に裁断して試験紙片を得た。得られた試験紙片６ｇ及び現場で採取した工程水（ｐＨ７．９）３００ｍＬを市販の家庭用ミキサーに加え、そこに調製したモノクロラミン水溶液を残留塩素量が１０ｍｇ／Ｌとなるように添加し、１分間ミキサー処理を行いパルプスラリーを得た。
得られたパルプスラリー中の試験紙片のほぐれ具合を目視で確認し、離解効果を下記の評価基準で評価した。その結果をパルプスラリーのｐＨとともに下記表１に示す。なお、ブランクとして、モノクロラミン水溶液を添加しない以外は、同様にパルプスラリーを調製して評価を行った。
＜評価基準＞
３：完全にほぐれている（膨潤した試験紙片が８割以上）
２：ほぼほぐれている（膨潤した試験紙片が５割〜７割）
１：一部ほぐれている（膨潤した試験紙片が２割〜４割）
０：ほとんどほぐれていない（膨潤した試験紙片が１割以下）
Example 1
[Disintegration effect confirmation test using milk carton]
Used milk carton paper collected on site was cut into approximately 2-4 cm square paper pieces to obtain test paper pieces. 6 g of the obtained test paper strip and 300 mL of process water (pH 7.9) collected on site were added to a commercially available household mixer, and the prepared monochloramine aqueous solution was added so that the residual chlorine amount was 10 mg / L, A mixer treatment was performed for 1 minute to obtain a pulp slurry.
The looseness of the test paper pieces in the obtained pulp slurry was visually confirmed, and the disaggregation effect was evaluated according to the following evaluation criteria. The results are shown in Table 1 below along with the pH of the pulp slurry. In addition, the pulp slurry was similarly prepared and evaluated except not adding a monochloramine aqueous solution as a blank.
<Evaluation criteria>
3: Completely loosened (swelled test piece is 80% or more)
2: Almost loose (50% to 70% of the swollen test strip)
1: Partly loosened (swelled test piece is 20% to 40%)
0: Almost not loosened (swelled test piece is 10% or less)
＜ｐＨの測定＞
パルプスラリーのｐＨは、卓上型ｐＨメーター（堀場製作所製Ｆ−７３）を用いて室温で測定した。
<Measurement of pH>
The pH of the pulp slurry was measured at room temperature using a desktop pH meter (F-73 manufactured by Horiba, Ltd.).
＜残留塩素量の測定＞
残留塩素量は、ラボ用残留塩素計（笠原理化工業製ＤＰ−３Ｚ）を用いて残留塩素濃度換算で測定した。
<Measurement of residual chlorine content>
The amount of residual chlorine was measured in terms of residual chlorine concentration using a laboratory-use residual chlorine meter (DP-3Z manufactured by Kasahara Kagaku Kogyo).
（実施例２）
モノクロラミン水溶液を、残留塩素量が１５ｍｇ／Ｌとなるように添加した以外は、実施例１と同様に行った。
(Example 2)
The same procedure as in Example 1 was performed except that an aqueous monochloramine solution was added so that the amount of residual chlorine was 15 mg / L.
（実施例３）
モノクロラミン水溶液に加えて、水酸化ナトリウム水溶液を対固形分濃度が０．２重量％となるように添加した以外は、実施例２と同様に行った。
(Example 3)
The same procedure as in Example 2 was performed except that a sodium hydroxide aqueous solution was added to the monochloramine aqueous solution so that the solid content concentration was 0.2% by weight.
（比較例１）
モノクロラミン水溶液に代えて、次亜塩素酸ナトリウム水溶液を残留塩素量が２０ｍｇ／Ｌとなるように添加した以外は、実施例１と同様に行った。
(Comparative Example 1)
It replaced with the monochloramine aqueous solution and carried out similarly to Example 1 except having added sodium hypochlorite aqueous solution so that the amount of residual chlorine might be set to 20 mg / L.
（比較例２）
次亜塩素酸ナトリウムに加えて、水酸化ナトリウム水溶液を対固形分濃度が０．２重量％となるように添加した以外は、比較例１と同様に行った。
(Comparative Example 2)
In addition to sodium hypochlorite, the same procedure as in Comparative Example 1 was carried out except that an aqueous sodium hydroxide solution was added so that the solid content concentration was 0.2% by weight.
（比較例３）
モノクロラミン水溶液に代えて、水酸化ナトリウム水溶液を下記表１の量となるように添加した以外は、実施例１と同様に行った。
(Comparative Example 3)
It replaced with the monochloramine aqueous solution and carried out similarly to Example 1 except having added sodium hydroxide aqueous solution so that it might become the quantity of following Table 1. FIG.
モノクロラミン水溶液を添加した実施例１から３は、いずれもミルクカートン試験紙片を完全にほぐすことができた。
また、実施例１及び２に示すように、水酸化ナトリウム（アルカリ剤）を併用しない場合であっても、モノクロラミン単独でミルクカートン試験紙片を完全にほぐすことができた。
In each of Examples 1 to 3 to which an aqueous monochloramine solution was added, the milk carton test strips could be completely loosened.
In addition, as shown in Examples 1 and 2, even when sodium hydroxide (alkaline agent) was not used in combination, the milk carton test paper pieces could be completely loosened with monochloramine alone.
（実施例１１）
［古紙両面段ボール紙を用いた離解効果確認試験］
某製紙工場で採取した工程水に対し、調製したモノクロラミン水溶液を残留塩素量が３ｍｇ／Ｌとなるように添加し、その後６時間攪拌した。試験用離解機（熊谷理機工業株式会社製）に、約２〜４ｃｍ四方に裁断した古紙両面段ボール紙（Ａフルート）約４５ｇと、６時間攪拌した工程水１．５Ｌとを入れた。回転数２，０００ｒｐｍで５分間離解処理を行い、古紙パルプ濃度が３重量％のパルプスラリーを調製した。得られたパルプスラリーを古紙パルプ濃度が１重量％になるように希釈し、その後、全量を試験用フラットスクリーン（熊谷理機工業株式会社製、スクリーンプレート：６カット（０．１５ｍｍ））に加え、１０分間処理した。スクリーン上の残渣を採取して残渣重量を測定し、下記式から離解率を算出した。その結果を下記表２に示す。パルプスラリーのｐＨは、実施例１と同様に測定した。
離解率（％）＝｛（Ａ−Ｂ）／Ａ｝×１００
Ａ：工程水と混合した古紙両面段ボール紙の重量（絶乾重量）（ｇ）
Ｂ：残渣重量（絶乾重量）（ｇ）
(Example 11)
[Diffusion effect confirmation test using double-sided corrugated paper]
The prepared monochloramine aqueous solution was added to the process water collected at the Tsuji Paper Mill so that the amount of residual chlorine was 3 mg / L, and then stirred for 6 hours. About 45 g of used paper double-sided corrugated paper (A flute) cut to about 2 to 4 cm square and 1.5 L of process water stirred for 6 hours were put into a test disaggregator (manufactured by Kumagaya Rikyu Kogyo Co., Ltd.). A disaggregation treatment was performed at a rotational speed of 2,000 rpm for 5 minutes to prepare a pulp slurry having a waste paper pulp concentration of 3% by weight. The obtained pulp slurry is diluted so that the waste paper pulp concentration is 1% by weight, and then the whole amount is added to a test flat screen (Kumagaya Riki Kogyo Co., Ltd., screen plate: 6 cuts (0.15 mm)). Treated for 10 minutes. The residue on the screen was collected, the residue weight was measured, and the disaggregation rate was calculated from the following formula. The results are shown in Table 2 below. The pH of the pulp slurry was measured in the same manner as in Example 1.
Disintegration rate (%) = {(A−B) / A} × 100
A: Weight of double-sided corrugated paper mixed with process water (dry weight) (g)
B: Residue weight (absolute dry weight) (g)
（実施例１２及び１４）
モノクロラミン水溶液を、残留塩素量が１０又は１５ｍｇ／Ｌとなるように添加した以外は、実施例１１と同様に行った。
(Examples 12 and 14)
The same procedure as in Example 11 was performed, except that an aqueous monochloramine solution was added so that the residual chlorine amount was 10 or 15 mg / L.
（実施例１３及び１５）
モノクロラミン水溶液に加えて、水酸化ナトリウム水溶液を対固形分濃度が０．５又は０．２重量％となるように添加した以外は、実施例１２又は１４と同様に行った。
(Examples 13 and 15)
In the same manner as in Example 12 or 14, except that an aqueous sodium hydroxide solution was added to the monochloramine aqueous solution so that the solid content concentration was 0.5 or 0.2% by weight.
（比較例１１−１３）
モノクロラミン水溶液に代えて、次亜塩素酸ナトリウム水溶液を下記表２に示す濃度となるように添加した以外は、実施例１１と同様に行った。
(Comparative Example 11-13)
It replaced with the monochloramine aqueous solution and carried out similarly to Example 11 except having added the sodium hypochlorite aqueous solution so that it might become the density | concentration shown in following Table 2.
（比較例１４）
水酸化ナトリウムに加えて、次亜塩素酸ナトリウム水溶液を残留塩素量が２０ｍｇ／Ｌとなるように添加した以外は、実施例１１と同様に行った。
(Comparative Example 14)
In addition to sodium hydroxide, the same procedure as in Example 11 was performed, except that an aqueous sodium hypochlorite solution was added so that the residual chlorine amount was 20 mg / L.
（比較例１５−１６）
モノクロラミン水溶液に代えて、水酸化ナトリウム水溶液を下記表２に示す濃度となるように添加した以外は、実施例１１と同様に行った。
(Comparative Example 15-16)
It replaced with the monochloramine aqueous solution and carried out similarly to Example 11 except having added sodium hydroxide aqueous solution so that it might become the density | concentration shown in following Table 2.
モノクロラミン水溶液を添加した実施例１１から１５の離解率はいずれも９５％以上であり、比較例１１から１６と比較して高い離解率で離解することができた。実施例１１、１２及び１４に示す通り、水酸化ナトリウム（アルカリ剤）を併用しない場合であっても、モノクロラミン単独で古紙両面段ボール紙を完全にほぐすことができた。実施例１１に示す通り、モノクロラミンを使用することで、３ｍｇ／Ｌと低い残留塩素量であっても、９５％の高い離解率で離解することができた。 The disaggregation rates of Examples 11 to 15 to which the monochloramine aqueous solution was added were all 95% or more, and it was possible to disaggregate at a higher disaggregation rate than Comparative Examples 11 to 16. As shown in Examples 11, 12, and 14, even when sodium hydroxide (alkaline agent) was not used in combination, it was possible to completely loosen the used double-sided cardboard with monochloramine alone. As shown in Example 11, by using monochloramine, it was possible to disaggregate at a high disaggregation rate of 95% even with a residual chlorine amount as low as 3 mg / L.
（実施例２１）
［実機を用いた離解効果確認試験］
図１に示すような、パルパー１１、クリーナー（除塵設備）１２、スクリーン（除塵設備）１３、及びフローテーター１４を備える古紙パルプ製造設備を有する製紙工場Ａの設備を用いて、本開示の効果確認試験を実施した。当該設備において、パルパー１１に供給される処理水（モノクロラミン水溶液添加前の処理水）は、約５重量％のスラリーを含有し、パルパーにおいて対固形分（古紙）重量が２．０ｋｇ／ｔとなるように水酸化ナトリウム水溶液が添加されている（ｐＨ９）。
上記処理水に、モノクロラミン水溶液を対固形分（古紙）重量が１．０ｋｇ／ｔ（残留塩素量として５ｍｇ／Ｌ）となるように連続添加しながら、パルパー１１で古紙の離解処理を行った。モノクロラミン水溶液添加後のパルパー１１におけるｐＨは９であった。
(Example 21)
[Disintegration effect confirmation test using actual machine]
As shown in FIG. 1, the effect of the present disclosure is confirmed using equipment of a paper mill A having a waste paper pulp production facility including a pulper 11, a cleaner (dust removal facility) 12, a screen (dust removal facility) 13, and a floatator 14. The test was conducted. In this facility, the treated water supplied to the pulper 11 (treated water before adding the monochloramine aqueous solution) contains about 5% by weight of slurry, and the weight of solids (waste paper) in the pulper is 2.0 kg / t. A sodium hydroxide aqueous solution was added so as to become (pH 9).
While continuously adding an aqueous monochloramine solution to the treated water so that the weight of the solid content (waste paper) was 1.0 kg / t (residual chlorine amount was 5 mg / L), the pulper 11 was used to disaggregate the used paper. . The pH in the pulper 11 after addition of the monochloramine aqueous solution was 9.
＜評価＞
離解処理が促進されたかどうかは、パルパー１１内のパルプスラリーにおける残渣の量（未離解率）、及びパルパー１１後に配置された除塵設備（スクリーン１３）を通過したパルプスラリーにおけるチリ（夾雑物）の量で評価した。離解が不十分であれば、パルプスラリーに含まれるチリ（夾雑物）の量が増加するからである。それらの結果を下記表３に示す。
・未離解率
パルパー１１から排出されたパルプスラリーの一部を採取し、それを古紙パルプ濃度が１重量％になるように希釈し、全量を試験用フラットスクリーン（熊谷理機工業株式会社製、スクリーンプレート：６カット（０．１５ｍｍ））に加え、１０分間処理した。スクリーン上の残渣を採取して残渣重量を測定した。得られた残渣重量と、採取したパルプスラリー量に相当する古紙の重量（絶換重量）とを用いて、下記式から未離解率を算出した。その結果を下記表２に示す。
未離解率（％）＝｛Ｂ／Ａ｝×１００
Ａ：古紙の重量（絶乾重量）（ｇ）
Ｂ：残渣重量（絶乾重量）（ｇ）
・スクリーン後夾雑物
スクリーン１３を通過したパルプスラリーをパルプ固形分として１００ｇ採取し、それを抄紙した。得られた紙をダートカウンター（王子エンジ社製）で測定して紙中の夾雑物の面積を得た。
<Evaluation>
Whether or not the disaggregation process is promoted depends on the amount of residue (undisaggregation rate) in the pulp slurry in the pulper 11 and the dust (contamination) in the pulp slurry that has passed through the dust removal equipment (screen 13) disposed after the pulper 11. Evaluated by quantity. This is because if the disaggregation is insufficient, the amount of dust (contamination) contained in the pulp slurry increases. The results are shown in Table 3 below.
-Undissolved rate A part of the pulp slurry discharged from the pulper 11 was collected, diluted so that the waste paper pulp concentration was 1% by weight, and the total amount was flat screen for testing (manufactured by Kumagai Riki Kogyo Co., Ltd., Screen plate: 6 cuts (0.15 mm)) and treated for 10 minutes. The residue on the screen was collected and the residue weight was measured. The undissolved rate was calculated from the following formula using the obtained residue weight and the weight of the used paper corresponding to the amount of collected pulp slurry (exchanging weight). The results are shown in Table 2 below.
Undissolved rate (%) = {B / A} × 100
A: Weight of used paper (absolute dry weight) (g)
B: Residue weight (absolute dry weight) (g)
-Post-screen impurities 100g of pulp slurry that passed through the screen 13 was collected as pulp solids, and paper was made. The obtained paper was measured with a dirt counter (manufactured by Oji Engineering Co., Ltd.) to obtain the area of impurities in the paper.
（実施例２２）
水酸化ナトリウム水溶液の添加量を０とした以外は、実施例２１と同様に行った。その結果を下記表３に示す。
(Example 22)
The same operation as in Example 21 was performed except that the addition amount of the aqueous sodium hydroxide solution was changed to zero. The results are shown in Table 3 below.
（比較例２１）
モノクロラミン水溶液に代えて、対固形分（古紙）重量が６．０ｋｇ／ｔとなるように水酸化ナトリウム水溶液、及び対固形分（古紙）重量が１５．０ｋｇ／ｔとなるように珪酸ソーダを添加した以外は実施例２１と同様に行った。その結果を下記表３に示す。
なお、比較例２１は製紙工場Ａにおける通常時の操業条件である。
(Comparative Example 21)
Instead of the monochloramine aqueous solution, sodium hydroxide aqueous solution was added so that the weight with respect to the solid content (waste paper) was 6.0 kg / t, and sodium silicate was added so that the weight with respect to the solid content (waste paper) was 15.0 kg / t. The same operation as in Example 21 was performed except that the addition was made. The results are shown in Table 3 below.
In addition, Comparative Example 21 is a normal operation condition in the paper mill A.
表３に示すように、モノクロラミン水溶液を添加した実施例２１及び２２は、通常の操業条件である比較例２１と比較して未離解率が低く、スクリーン後のパルプスラリー中のチリ（夾雑物）の量が大幅に減少した。よって、モノクロラミンの存在下で古紙の離解処理を行うことにより、離解を促進できるといえる。 As shown in Table 3, Examples 21 and 22 to which an aqueous monochloramine solution was added had a low undissolved rate compared with Comparative Example 21 which is a normal operation condition, and dust (contaminants) in the pulp slurry after the screen. ) Amount significantly decreased. Therefore, it can be said that disaggregation can be promoted by performing disaggregation processing of waste paper in the presence of monochloramine.
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| JP2015525308A (en) * | 2012-06-05 | 2015-09-03 | バックマン・ラボラトリーズ・インターナショナル・インコーポレーテッドＢｕｃｋｍａｎ Ｌａｂｏｒａｔｏｒｉｅｓ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｉｎｃｏｒｐｏｒａｔｅｄ | Method for preserving starch in pulp and method for controlling calcium precipitation and / or scaling |
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