WO2023034766A1 - Procédé de réduction de contaminants hydrophobes dans un procédé de mise en pâte ou de fabrication de papier - Google Patents

Procédé de réduction de contaminants hydrophobes dans un procédé de mise en pâte ou de fabrication de papier Download PDF

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Publication number
WO2023034766A1
WO2023034766A1 PCT/US2022/075618 US2022075618W WO2023034766A1 WO 2023034766 A1 WO2023034766 A1 WO 2023034766A1 US 2022075618 W US2022075618 W US 2022075618W WO 2023034766 A1 WO2023034766 A1 WO 2023034766A1
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Prior art keywords
cationic polymer
actives
blend
cleaning
pulp
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PCT/US2022/075618
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English (en)
Inventor
Davit Edward Sharoyan
Daniel Joseph Nicholson
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Solenis Technologies Cayman, L.P.
Solenis Technologies, L.P.
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Publication of WO2023034766A1 publication Critical patent/WO2023034766A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/008—Prevention of corrosion or formation of deposits on pulp-treating equipment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/65—Acid compounds

Definitions

  • the present disclosure generally relates to a method of reducing hydrophobic contaminants in a pulping or papermaking process. More specifically, this disclosure relates to applying a cationic polymer and a particular cleaning blend to the lignocellulosic pulp to reduce a content of hydrophobic contaminants in a pulping or papermaking process.
  • Pitch hydrophobic plant materials commonly described as “pitch” into a process liquor.
  • Pitch is typically described as a natural wood component (2-6% of raw wood) that gets liberated from lignocellulosic fiber upon wood chip pulping.
  • the hydrophobic plant materials are soluble in organic solvents and can be quantified by extracting dry wood or pulp mass and evaporating the solvent.
  • An “extractives content” is defined as a weight fraction of extracted material versus a starting material after extraction with a designated solvent or solvents, as described in TAPPI Standard T 204 cm- 17 Solvent Extractives of Wood and Pulp.
  • the mixtures of hydrophobic plant materials and solvents may be further analyzed using gas chromatography and mass spectrometry GC-MS to identify individual substances.
  • Standard laboratory GC methods with Flame Ionization Detection GC-FID may be calibrated with standards to quantify selected compounds and to group similar substances into classes based on structures, functional groups, etc. The method may be used to estimate the quantity of each “class” in a pitch sample.
  • hydrophobic plant materials diffuse out of wood in small colloidal form during hot pulp cooking and defiberization processes and may continue to diffuse throughout washing, oxygen delignification, bleaching, and extraction stages if the pulp is bleached in further processing. As the pulp undergoes these stages, washing is often performed therebetween.
  • the hydrophobic plant materials may be partially removed with the wash liquor and may partially remain fixed to the lignocellulosic fibers.
  • the hydrophobic plant materials may also separate from the lignocellulosic fibers during drying, e.g. if a mat is dried for repulping later, as water is driven out. The hydrophobic plant materials may then deposit on equipment surfaces and dryer felt.
  • the hydrophobic plant materials may also diffuse out of the lignocellulosic fibers much later, e.g. when the lignocellulosic fibers are formed into a mat and dewatered to form paper in various types of paper mills. These types of hydrophobic plant materials may deposit on equipment or paper anywhere in a papermaking process from pulp storage tanks to a final dried sheet.
  • Natural pitch can form undesirable deposits anywhere and at any time during pulping processes, pulp bleaching, storage and later in the papermaking process. Pitch deposits can be troublesome for the process equipment, plugging wash screens, press and dryer felts, and thus requiring maintenance downtime. More importantly, if allowed to agglomerate and form larger deposits, pitch manifests as visible flaws in the pulp sheet and downgrades product quality. Defects from pitch deposition are not desirable and will lead to direct financial losses.
  • controlling hydrophobic plant materials are based on application of detackifi cation agents which can coat pitch particles and make them less hydrophobic and less tacky. This can be achieved by application of specific polymers of a dual nature (e.g. hydrophobically modified polyethylene glycols, hydrophobically modified polyaminoamides or hydrophobically modified cellulose derivatives).
  • controlling hydrophobic plant materials can include using inorganic minerals, e.g. talc. Natural mineral talc has been used as an effective pitch control agent for many years. Talc microscopic platelets, being hydrophobic in nature, can easily interact with and coat pitch particles and make them less tacky.
  • Talc coated pitch particles can then be incorporated with lignocellulosic fibers adding to the overall pulp yield.
  • lignocellulosic fibers adding to the overall pulp yield.
  • talc a commercial desire to move away from talc.
  • Other minerals such as bentonite, kaolin, smectite, and others and/or modified minerals have also been used for pitch control.
  • Pitch control agents with different modes of action are not commonly used together. In many cases, such agents are not compatible with each other and, in some cases, have opposing functionalities. For example, application of fixatives leads to removal of organic contaminant from dissolved/colloidal phases onto the surface of lignocellulosic fibers. On the other hand, application of cleaning agents leads to solubilization and dissolution of tacky deposits from the equipment surface to an aqueous phase. Accordingly, there remains opportunity for improvement.
  • This disclosure provides a method of reducing hydrophobic contaminants in a pulping or papermaking process.
  • the method includes the steps of: providing a lignocellulosic pulp comprising lignocellulosic fibers and at least one hydrophobic contaminant; providing a cationic polymer; providing a cleaning blend comprising a vegetable oil alkyl ester and at least one surfactant; and applying the cationic polymer and the cleaning blend to the lignocellulosic pulp to reduce a content of the at least one hydrophobic contaminant in the pulping or papermaking process.
  • FIG. 1 is a bar graph showing % pitch particle count reduction as a function of Polymers and Formulations of the Examples
  • FIG. 2 is a bar graph showing % pitch particle count reduction as a function of Formulation of the Examples
  • FIG. 3 is a bar graph showing pitch particle count as a function of Formulation of the Examples
  • FIG. 4 is a bar graph showing % pitch particle count reduction as a function of Polymer and Formulation of the Examples
  • FIG. 5 is a bar graph showing % pitch particle count reduction as a function of Polymer and Formulation of Example 4;
  • FIG. 6 is a bar graph showing % pitch particle count reduction as a function of Polymer and Formulation of Example 5;
  • FIG. 7 is a bar graph showing % pitch particle count reduction as a function of Polymer and Formulation of Example 6.
  • FIG 8 is a bar graph showing % pitch particle count reduction as a function of polymer and formulation dosages and their separate or combined application
  • Various embodiments of the present disclosure are generally directed to hydrophobic contaminant control compositions and methods for forming and using the same.
  • conventional techniques related to hydrophobic contaminant removal in lignocellulosic pulp may not be described in detail herein.
  • the various tasks and process steps described herein may be incorporated into a more comprehensive procedure or process having additional steps or functionality not described in detail herein.
  • steps in the manufacture of pulp compositions are well-known and so, in the interest of brevity, many conventional steps will only be mentioned briefly herein or will be omitted entirely without providing the well-known process details.
  • the terminology “about” can describe values ⁇ 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10%, in various embodiments. Moreover, it is contemplated that, in various nonlimiting embodiments, all values set forth herein may be alternatively described as approximate or “about.” It is also contemplated that the terminology weight percent described anywhere herein may be further described as weight percent actives, as would be understood by one of skill in the art. As just one non-limiting example, this weight percent actives may be based on a total weight of actives of a combination of the cationic polymer and the cleaning blend.
  • the current disclosure describes efficient alternatives for pitch removal from various processes including pulping processes.
  • the method may include using formulations in which cationic polymers (such as fixatives) are combined with dispersing and/or cleaning and/or passivation agents.
  • cationic polymers such as fixatives
  • Different classes of compounds can be used for pitch control or pitch deposition issues remediation due to their detackifying, passivating, dissolving and stabilization properties.
  • detackification typically means interaction with hydrophobic particles and making them less tacky and less prone to agglomeration and deposition.
  • passivation and stabilization typically mean interaction with equipment surfaces and coating them with passivation layer or making them more stable by changing their surface characteristics and less prone to deposition.
  • Cleaning agents are typically solvents or solvents combined with surfactants and are typically used to solubilize and clean organic deposits from equipment surfaces.
  • this technology is utilized to reduce or eliminate agglomeration of pitch particles and reduce, remove, or eliminate pitch deposition, in various processes as chosen by one of skill in the art.
  • this technology is typically utilized to reduce or eliminate agglomeration of pitch particles and reduce, remove or eliminate pitch deposition. It can be applied in a pulp setting and/or a paper machine. This technology can be effectively applied for pitch control when virgin pulp or TMP, NSSC, deinked, or other pulps are used in papermaking. This technology can also be used for stickies control as well in recycled mills with the use of OCC pulp or blends of OCC with virgin pulp, deinked pulp, MOW, NSSC, TMP of other source of pulp.
  • This disclosure provides a method of reducing hydrophobic contaminants in a pulping or papermaking process.
  • this method provides a cleaner overall pulping or papermaking process and system. For example, if water is recycled, pitch particles are greatly reduced or eliminated such that they do not re-enter the overall process.
  • the method may include, consist essentially of, or consist of, the steps of: providing a lignocellulosic pulp comprising lignocellulosic fibers and at least one hydrophobic contaminant; providing a cationic polymer; providing a cleaning blend comprising a vegetable oil alkyl ester and at least one surfactant and optionally vegetable oil; and applying the cationic polymer and the cleaning blend to the lignocellulosic pulp to reduce a content of the at least one hydrophobic contaminant in the pulping or papermaking process.
  • the terminology “consist essentially of’ may describe various embodiments that are free of one or more steps of utilizing components that are not described herein and/or are described as optional herein.
  • the method includes the step of providing the lignocellulosic pulp which includes the lignocellulosic fibers and which includes the at least one hydrophobic contaminant. Relative to the lignocellulosic pulp, this pulp includes one or more types of lignocellulosic fibers which may be alternative described as “fibers” herein. These lignocellulosic fibers may be derived from any source known in the art. In various embodiments, the lignocellulosic fibers are derived from virgin fiber, NS SC pulp, mechanical pulp, thermomechanical pulp, unbleached Kraft pulp, deinked pulp, OCC pulp, recycled paper or cardboard, or combinations thereof.
  • the weight or amount of the lignocellulosic fibers in the pulp is not particularly limited and may be chosen by one of skill in the art. In various non-limiting embodiments, all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the at least one hydrophobic contaminant may be any known in the art of papermaking and/or pulp processing.
  • the at least one hydrophobic contaminant is a hydrophobic plant material.
  • the at least one hydrophobic contaminant is hydrophobic pitch.
  • the at least one hydrophobic contaminant may be what is known in the art as a “stickie” mostly originated from recycle pulp.
  • Pitch is a combination of fatty acids, resin acids, fatty acid triglycerides, long chain fatty alcohols, sterols and combinations thereof.
  • the weight or amount of the at least one hydrophobic contaminant is not particularly limited and may be chosen by one of skill in the art. However, the at least one hydrophobic contaminant is typically present in the pulp in an amount of from about 0 to about 0.001%, about 0.05% to about 0.1%, or about 0.5% to about 1.0%, weight percent actives based on a total weight of the pulp. In various non-limiting embodiments, all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the method also includes the step of providing a contaminant control composition, alternatively described herein as the “composition.”
  • the composition typically is, includes, consists essentially of, or consists of a cationic polymer and a cleaning blend.
  • the weight or amount of the cationic polymer and the cleaning blend are not particularly limited and may be chosen by one of skill in the art. Various weights are described in detail below.
  • consist essentially of may describe various embodiments that are free of, or include less than about 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt%, of other cationic polymers that are not the cationic polymer of this disclosure and/or one or more ethers, esters, alkoxylates, surfactants, additives, etc. that are not those described herein or are optional herein.
  • the composition is not particularly limited and may be a liquid or may be an aqueous or non-aqueous emulsion.
  • the emulsion is also not particularly limited and may be further described as an oil-in-water emulsion, a water-in-oil emulsion, a water-in-oil-in-water emulsion, or an oilin-water-in-oil emulsion.
  • the method may be described as including the steps of providing the cationic polymer and the providing the cleaning blend.
  • the cationic polymer and the cleaning blend may be provided separately or together.
  • this polymer may be any known in the art.
  • the cationic polymer can interact with negatively charged pitch particles and also interact with negatively charged surfaces of lignocellulosic fibers. As a result of those interactions, hydrophobic pitch particles can get fixated on the surface of lignocellulosic fibers.
  • the cationic polymer can be alternatively described as a fixative.
  • the cationic polymer is chosen from cationic polyacrylamides, polyvinylamines, polyethyleneimines, diallyldimethylammonium chloride polymers, trialkylamminoalkyl (meth)acrylamide polymers, epichlorohydrin-dimethylamine copolymers, and combinations thereof.
  • the cationic polymer may be chosen from polydiallyldimethylammonium chloride, polyamines, polyvinylamines, cationic polyacrylamides, copolymers of poly diallyldimethylammonium chloride and acrylic acid, and combinations thereof.
  • the cationic polymer may be a cationic polyacrylamide.
  • the cationic polyacrylamide is a copolymer of a cationic monomer and acrylamide.
  • the cationic monomers may include, for example but without limitation: 7V,7V- dialkylaminoalkyl(meth)acrylates, such as VV-dimethylaminoethylacrylate and 7V,7V- dimethylaminoethylmethacrylate, or 7V,7V-dialkylaminoalkyl(meth)acrylamides, such as N,N- dimethylaminopropylacrylamide, 7V,7V-dimethylaminopropylmethacrylamide, and/or the salts and quaternaries thereof; and/or combinations thereof.
  • the cationic polymer is cationic polyacrylamide where the molar content of the cationic monomer relative to the total monomer is from about 15 mole% to about 50 mole%. In various embodiments, this amount is from about 20 to about 45, about 25 to about 40, or about 30 to about 35, mole%. In one embodiment, the cationic polymer is 30 mol%. Polymer weight average molecular weight may be from about 0.1 mln to about 10.0 mln Da, or from about 0.5 mln to about 2.0 mln Da.
  • this molecular weight is about 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2, mln Da.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the most efficient polymers may be or include highly charged cationic polyacrylamides.
  • the cationic acrylamide can be in the form of non-aqueous or aqueous emulsion or a powder.
  • the cationic polymer is polydiallyldimethylammonium chloride (PolyDADMAC).
  • PolyDADMAC polydiallyldimethylammonium chloride
  • the specific PolyDADMAC has a weight average molecular weight (Mw) of from about 100,000 to about 500,000 Da.
  • the cationic polymer is a polyamine.
  • the type of polyamine is not particularly limited and may be chosen by one of skill in the art, having a weight average molecular weight Mw of from about 100,000 to about 500,000 Da.
  • the cationic polymer is a polyvinylamine.
  • the polyvinylamine may be derived from at least one monomer chosen from N- vinylformamide, N-vinyl methyl formamide, N-vinylphthalimide, N-vinylsuccinimide, N-vinyl-t- butylcarbamate, N-vinylacetamide, and mixtures of any of the foregoing, wherein typically at least one monomer is N-vinylformamide having a weight average molecular weight Mw of from about 300,000 to about 500,000 Da.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the cationic polymer is a polymer dispersion including (i) a high molecular weight cationic polyacrylamide and (ii) a low molecular weight highly changed cationic dispersant polymer.
  • the cationic polymer is a cationic polyacrylamide.
  • the type of cationic polyacrylamide is not particularly limited and may be chosen by one of skill in the art and may be as described above.
  • the cationic polyacrylamide may be derived from at least one monomer chosen from diallyldimethylammonium chloride, N,N,N-trialkylamminoalkyl (meth)acrylate, N,N,N-trialkylamminoalkyl (meth) acrylamide, epichlorohydrin-dimethylamine and combinations thereof.
  • the weight average molecular weight of the cationic polymer is from about 100,000 to about 10 million Da and e.g. about 400,000 to about 1 million Da. In various non-limiting embodiments, all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the cationic polymer is present in an amount of from about 1 to about 90, about 10 to about 90, about 16 to about 84, about 20 to about 80, about 25 to about 75, about 30 to about 70, about 35 to about 65, about 40 to about 60, about 45 to about 55, or about
  • the weight basis may be weight percent actives based on a total weight of actives of a combination of the cationic polymer and the cleaning blend.
  • the cationic polymer is present in an amount of from about 1 to about
  • the weight ratio of actives of the cationic polymer to the cleaning blend is from about 20 to about 80, about 25 to about 75, about 30 to about 70, about 35 to about 65, about 40 to about 60, about 45 to about 55, or about 50 to about 55.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • this composition may be, include, consist essentially of, or consists of, a vegetable oil alkyl ester and at least one surfactant and optionally vegetable oil.
  • the terminology “consist essentially of’ may describe various embodiments that are free of, or include less than about 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt%, of other compounds that are not the vegetable oil alkyl ester and/or at least one surfactant of this disclosure and/or the optional vegetable oil and/or one or more ethers, esters, alkoxylates, surfactants, additives, etc. that are not those described herein or are described as optional herein.
  • the weight or amounts of the vegetable oil alkyl ester, optional vegetable oil, and/or at least one surfactant are not particularly limited and may be chosen by one of skill in the art.
  • the cleaning blend is typically present in an amount of from about 0 to about 1, about 30 to about 50, or about 70 to about 90, or about 90 to about 99 weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition. In other embodiments, this amount is about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10...
  • weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the vegetable oil alkyl ester is not particularly limited in type and may be any known in the art.
  • the vegetable oil alkyl ester is chosen from soybean oil methyl esters, canola (rapeseed) oil methyl esters, corn oil methyl esters, castor oil methyl esters, and combinations thereof.
  • the vegetable oil alkyl ester is soybean oil methyl ester.
  • the vegetable oil alkyl ester is present in an amount of from about 0.5 to about 1.0, about 5.0 to about 10.0, or about 50 to about 90, weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the optional vegetable oil is not particularly limited in type and may be any known in the art.
  • the optional vegetable oil is chosen from soybean oil, canola (rapeseed) oil, corn oil, coconut oil, olive oil, palm oil, castor oil, and combinations thereof.
  • the optional vegetable oil is soybean oil.
  • the optional vegetable oil is typically present in an amount of from about 0.025 to about 0.5, about 1.0 to about 5.0, or about 10.0 to about 25, weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the hydrophobic agent may be chosen from animal oils, mineral oils, silicone oils, terpenes, natural and synthetic aliphatic hydrocarbons, and combinations thereof.
  • the one or more hydrophobic agents may be present in an amount of from about 0.025 to about 0.5, about 1.0 to about 10.0, or about 50.0 to about 90.0, weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • the at least one surfactant is not particularly limited in type and may be any known in the art.
  • the at least one surfactant is chosen from cationic surfactants, anionic surfactants, non-ionic surfactants, zwitterionic surfactants, amphoteric surfactants, and combinations thereof.
  • the at least one surfactant is chosen from linear ethoxylated alcohols, branched ethoxylated alcohols, ethoxylated fatty acids, ethoxylated castor oils, ethoxylated sorbitan alcohols, alkyl polyglucosides, ethoxylated glycerides, copolymers of ethylene oxide and propylene oxide, and combinations thereof.
  • the at least one surfactant is an ethoxylated castor oil.
  • the at least one surfactant may be an ethoxylated castor oil ethoxylated with 13 to 42 moles of ethylene oxide.
  • the at least one surfactant may also include, but is not limited to, C12-C18 alcohol ethoxylates and/or fatty alcohol ethoxylates with about 3 to about 20 EO units.
  • the at least one surfactant is a non-ionic surfactant.
  • the at least one surfactant is or includes a high HLB surfactant, e.g. having an HLB of from about 8 to about 16.
  • the at least one surfactant is present in an amount of from, about 0.5 to about 1.0, about 5.0 to about 10.0, or about 30 to about 50, of from about 0.5 to about 90, about 1 to about 90, about 5 to about 90, about 10 to about 90, about 30 to about 90, about 50 to about 90, about 5 to about 85, about 10 to about 80, about 15 to about 75, about 20 to about 70, about 25 to about 65, about 30 to about 60, about 35 to about 55, about 40 to about 50, about 45 to about 50, or about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, or 90, weight percent actives based on a total weight of actives of the combination of the cationic polymer, the ester and the surfactant, and the optional vegetable oil or based on a total weight of actives of, or a total weight of, the composition or weight percent actives based on a total weight of actives of the combination of the combination of the cationic polymer,
  • a relative ratio of vegetable oil methyl ester, optional vegetable oil and surfactant(s) can vary broadly, wherein the amount of each component can vary from about 20 to about 80% for the vegetable oil methyl ester, about 0 and up to about 20% for the optional vegetable oil , and about 20 to about 80%, for the at least one surfactant. More specifically, the weight amounts can be from about 40 to about 60% for the vegetable oil methyl ester, about 0 and up to about 20% for the optional vegetable oil and from about 40 to about 60% for the at least one surfactant.
  • the % weight ratio of actives of cationic polymer and a cleaning blend can vary from about 5: 1, about 2: 1, about 1 :1, or about 1 :2 to about 1 :5. In various embodiments, the weight ratio of actives of cationic polyacrylamide to the cleaning blend is from about 1 : 1 to about 1 :5. If expressed in %, in various embodiments, the cationic polymer is present in an amount of about 16 to about 50 wt% actives and the cleaning blend is present in an amount of from about 50 to about 84 % actives, based on a total weight of the cationic polymer and the cleaning blend.
  • the method also includes the step of applying the cationic polymer and the cleaning blend, or alternatively, applying the contaminant control composition, to the lignocellulosic pulp to reduce a content of the at least one hydrophobic contaminant in the pulping or papermaking process.
  • the step of applying may occur at any point in any papermaking process or any pulp mill process.
  • the step of applying the contaminant control composition to the pulp is further defined as applying the contaminant control composition to the pulp in a pulp mill.
  • the step of applying the contaminant control composition to the pulp is further defined as applying the contaminant control composition to the pulp in a papermaking machine.
  • the step of applying the cationic polymer and the step of applying the cleaning blend to the pulp is further defined as applying to the pulp in a pulp mill.
  • the step of applying the cationic polymer and the step of applying the cleaning blend to the pulp is further defined as applying in a papermaking machine.
  • the cationic polymer is applied to the lignocellulosic pulp simultaneously (which may mean applied at the same time but separately from each other or applied at the same time when together as a blend or mixture) with the cleaning blend.
  • the cationic polymer is applied to the lignocellulosic pulp independently from the cleaning blend.
  • the step of applying the cationic polymer and the step of applying the cleaning blend may each be further independently (e.g. separately) defined as applying a whole content, or a series of partial contents, of the components. In other words, every component described herein can be applied as a total amount all at once or in a series of partial amounts over time such that the total amount is eventually applied.
  • the cationic polymer is applied to the lignocellulosic pulp simultaneously with the cleaning blend wherein the cationic polymer and the cleaning blend are not mixed with each other during application.
  • the cationic polymer is applied to the lignocellulosic pulp simultaneously with the cleaning blend wherein the cationic polymer and the cleaning blend are mixed with each other, e.g. either during application or mixed with each other prior to application.
  • the cationic polymer is applied to the lignocellulosic pulp at a different time than the cleaning blend.
  • the cationic polymer is applied prior to the cleaning blend.
  • the cationic polymer is applied subsequent to the cleaning blend.
  • the cationic polymer and the cleaning blend can be added separately in the method. Alternatively, they can be added together.
  • the cationic polymer can be provided independently of the cleaning blend or they can be packaged as a system/product together.
  • the technology of this disclosure may be utilized in pulp production, mat formation and drying (e.g. with market pulp), and papermaking.
  • the compositions described herein may be added to brownstock washing and/or bleaching processes.
  • the technology of this disclosure may be added to mat forming processes, mat drying processes, and/or wet storage processes.
  • the dosing point of any of the components described herein can be any point in the process. All points are expressly contemplated herein for use. Typically, the dosing point allows for sufficient mixing and pulp contact time to reduce pitch in the effluent and decrease deposition on equipment.
  • the dosing point of any of the components described herein can be any point in the process. All points are expressly contemplated herein for use.
  • the composition may be utilized to allow for sufficient time for product mixing and fixing of colloidal pitch.
  • the technology of this disclosure can be added to the pulp before drying and/or after bleaching, in a high density storage tank, and/or before, during, or after mat formation.
  • the technology of this disclosure is added to deactivate pitch before a drop in pH.
  • the technology of this disclosure can also be used for pitch control in papermaking.
  • the technology of this disclosure is applied to a pulp storage tank, and/or in one or more blend chests, machine chests, leveling chests, etc.
  • the reduction in content of the at least one hydrophobic contaminant achieved in this disclosure may be calculated using any method known in the art.
  • pitch reduction is calculated gravimetrically by observing the reductions in organic contaminant weight, by counting pitch defects on finished paper, or by counting pitch particles of certain size.
  • Pitch particle count is typically based on counting spherical particles in 1 to 10 micron size range with and without chemical treatments. % Pitch count reductions are calculated by taking a ratio of the difference in pitch count without and with chemical treatments over pitch counts without treatment, all multiplied by 100%. A method used for pitch quantification is described in US10844544, which is hereby expressly incorporated herein by reference in its entirety in various non-limiting embodiments.
  • the reduction in content of the at least one hydrophobic contaminant is described as from about 1 to about 100, about 5 to about 95, about 10 to about 90, about 15 to about 85, about 20 to about 80, about 25 to about 75, about 30 to about 70, about 35 to about 65, about 40 to about 60, about 45 to about 55, or about 50, % reduction.
  • the reduction is described as a reduction in weight but may alternatively be described as reduction in volume or reduction in total number of particles, e.g. pitch particles.
  • all values and ranges of values, both whole and fractional, including and between those values set forth above, are hereby expressly contemplated for use herein.
  • This disclosure also provides a lignocellulosic pulp composition which may be, include, consist essentially of, or consist of a plurality of lignocellulosic fibers, the cationic polymer, and the cleaning blend described above.
  • a lignocellulosic pulp composition which may be, include, consist essentially of, or consist of a plurality of lignocellulosic fibers, the cationic polymer, and the cleaning blend described above.
  • Each of the above components may be any as described herein and be present in any amount described herein.
  • consist essentially of may describe various embodiments that are free of, or include less than about 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wt%, of one or more cationic polymers that are not those described herein, one or more vegetable oil alkyl ester that are not those described herein, one or more optional vegetable oils that are not those described herein, one or more surfactants that are not described herein, and/or any compounds not described herein or described herein as optional.
  • cellulose stock solution having 0.5% consistency made from bleached Kraft pulp and white water received from a southern US paper mill as well as tap water.
  • the stock solution was furnished either with 20 ppm synthetic pitch or 20 ppm birch pitch extract or eucalyptus pitch extract. Birch and eucalyptus pitch extracts were obtained by extraction from cooked birch or eucalyptus chips.
  • Samples of 0.5% consistency pulp with 20 ppm synthetic or natural wood pitch were treated as described below. The samples were placed in a 50°C water bath for 30 minutes. After 30 minutes, the samples were removed from the water bath and filtered through 25 micron filter paper. After cooling to room temperature, filtrates were analyzed by Flowcam PV-100 (particle count, size, and shape analyzer from Flow Imaging Technologies).
  • Filtrate analyses included counting a total number of particles having a particle size of from about 2 to about 10 microns as well as counting a number of spherical particles within the same size range.
  • the number of spherical particles corresponds to the number of pitch particles (or hydrophobic particles in general) within the range of about 2 to about 10 microns.
  • the number of spherical particles (having aspect ratio AR equal to 0.8 or higher, e.g. 0.95) were counted in the samples with chemical treatments and then were compared with the number spherical particles counts in No Treatment (NT) sample (which was furnished with synthetic or natural pitch but no chemical treatment).
  • NT No Treatment
  • Example 1 cationic polymers and various blended compositions were evaluated.
  • the cationic polymers included PolyDADMAC (Polymer A), highly charged cationic polyacrylamide (Polymer B), a polymeric emulsion product with blended PolyAPTAC and cationic acrylamide (Polymer C), and polyvinylamine (Polymer D).
  • Formulation E is an emulsion including soybean oil methyl ester, soybean oil and a combination of non-ionic surfactants to form Formulations A-D.
  • Formulation E is an example of a cleaning blend of this disclosure, where the amount of soybean oil methyl ester is from about 40 to about 60 wt % actives, the amount of soybean oil is from greater than about 0 and up to about 20 wt % actives, and the amount of castor oil ethoxylate is from about 40 to about 60 wt % actives.
  • Formulation A is a combination of Polymer A and Formulation E in a weight ratio of actives of 1 :4 and is one embodiment of the composition of this disclosure.
  • Formulation B is a combination of Polymer B and Formulation E in a weight ratio of actives of 1 :4 and is one embodiment of the composition of this disclosure.
  • Formulation C is a combination of Polymer C and Formulation E in a weight ratio of actives of 1 :4 and is one embodiment of the composition of this disclosure.
  • Formulation D is a combination of Polymer D and Formulation E in a weight ratio of actives of 1 :4 and is one embodiment of the composition of this disclosure.
  • Formulations A-D can be described as an inventive contaminant control composition.
  • Formulation E is a control because it does not include a cationic polymer
  • Polymers A-D were each tested alone at active 0.2 Ib/ton dosages to determine % pitch count reduction.
  • Formulation E was also tested alone at 0.8 active Ib/ton dosage to determine % pitch count reduction.
  • pitch count reductions with the various Formulations were measured to be from -10.8% to 70.0%.
  • the pitch count reduction was quite high at 41.2% and was comparable to the performance of pure Polymer A used in preparation of Formulation A.
  • Example 2 various compositions were evaluated. Birch pitch extract was used at 20 ppm levels. All formulations were screened at 1 active Ib/ton.
  • Formulations Bl and B2 are blends of cationic polyacrylamide, soybean oil methyl ester, soybean oil and a surfactant packages including castor oil ethoxylate and a C14-C16 ethoxylated alcohol.
  • Formulation F is a mixture of highly charged polyamine with soybean oil methyl ester, soybean oil and a non-ionic surfactants package as described above.
  • Formulation G is hydrophobically modified polyaminoamide.
  • Formulation H is a co-polymer comprising acrylic or (meth)acrylic acid, methyl styrene and styrene.
  • Both a cationic polyacrylamide itself (i.e., cationic polymer) and a mixture of soybean oil methyl ester/soybean oil/castor oil ethoxylate (i.e., cleaning blend) have independent pitch reduction properties due to pitch particles fixation on cellulose fibers (by the cationic acrylamide) or due to effective solubilization, stabilization and dispersion of pitch particles in aqueous phases (by the soybean oil methyl ester/soybean oil/castor oil ethoxylate).
  • a series of seven total formulations were made by forming a formulation described as Formulation B that includes varying weight percent actives of a charged cationic polyacrylamide emulsion (cationic polymer) described below and varying weight percent actives of the soybean oil methyl ester, the soybean oil, and the castor oil ethoxylate.
  • Formulation B includes varying weight percent actives of a charged cationic polyacrylamide emulsion (cationic polymer) described below and varying weight percent actives of the soybean oil methyl ester, the soybean oil, and the castor oil ethoxylate.
  • the cationic polymer is a high charged cationic polyacrylamide emulsion.
  • the cleaning blend is combination of soybean oil methyl ester, soybean oil and castor oil ethoxylate.
  • the ester is soybean oil methyl ester that is commercially available under tradename Soygold 1000.
  • the vegetable oil is soybean oil that is commercially available from ADM.
  • the surfactant is castor oil ethoxylate with HLB of approximately 13.
  • Formulation B-50 includes 50 wt% actives of cationic polyacrylamide and 50 wt% actives of the cleaning blend. Based on the performance of individual components and their dosages (0.5 active Ib/ton each), a skilled person would expect pitch reductions of the mixture to be 49.84% (which is a sum of 5.52% and 44.19%, pitch reductions with Formulation B-0 and Formulation B-100 normalized to their dosages). In fact, % pitch count reduction for Formulation B-50 is 67.24% and is significantly higher than expected from the sum of contributions of individual components. The additional 17.4% is due to the superior and unexpected synergistic boost in pitch count reduction performance.
  • Example 4 birch pitch extract was used at 20 ppm level. Two formulations were screened at 0.5 active Ib/ton.
  • Formulation B-2 is a blend of cationic polyacrylamide, soybean oil methyl ester, soybean oil and a surfactant
  • Formulation B-3 is a blend of cationic polyacrylamide, soybean oil methyl ester and a surfactant (similar to B-2 but without soybean oil in the composition.
  • Example 5 birch pitch extract was used at 20 ppm level.
  • Four formulations were screened at 0.5 active Ib/ton.
  • Formulation B-21 is an emulsion of cationic polyacrylamide, soybean oil methyl ester, soybean oil and a surfactant
  • Formulation B-22 is an emulsion of cationic polyacrylamide, soybean oil methyl ester and a surfactant (similar to B-21 but without soybean oil in the composition).
  • Formulation B-23 is an emulsion containing cationic polyacrylamide, soybean oil methyl ester and two non-ionic surfactants (similar to B-21 but soybean oil is replaced with an additional non-ionic surfactant).
  • Formulation B-24 is an emulsion of cationic polyacrylamide, castor oil methyl ester, canola oil and a non-ionic surfactant.
  • Formulations B-21, B-22, B-23 and B-24 show that all formulations are very efficient in pitch particle count reductions even at lower 0.5 Ib/ton dosage.
  • Formulations B-22 and B-23 do not contain vegetable oil.
  • Their composition comprises of cationic polymer, vegetable oil ester and surfactant(s). Nevertheless, their performance in pitch count reductions is comparable to those of B-21 and B-24, which compositions contain cationic polymer, vegetable oil alkyl ester, vegetable oil and a surfactant.
  • Example 6 birch pitch extract was used at 20 ppm level.
  • Four formulations were screened at 1.0 active Ib/ton.
  • Formulation B-2 is a blend containing cationic polyacrylamide, soybean oil methyl ester, soybean oil and a non-ionic surfactant.
  • Formulation B-24 is an emulsion containing cationic polyacrylamide, castor oil methyl ester, canola oil and a non-ionic surfactant.
  • Formulation B-25 is an emulsion containing cationic polyacrylamide, canola oil methyl ester, canola oil and a non-ionic surfactant.
  • Formulation B-26 is an emulsion with higher charge cationic acrylamide, castor oil methyl ester, canola oil and a non-ionic surfactant.
  • Formulation B-27 is an emulsion containing higher charge cationic polyacrylamide, canola oil methyl ester, canola oil and a non-ionic surfactant.
  • Example 7 shows that all formulations are very efficient in pitch particle count reductions at 1.0 active Ib/ton dosage.
  • Example demonstrates that samples are very efficient in pitch count reductions regardless of being blends (B-2) or aqueous emulsions (B-24, B-25, B-26, B-27).
  • Example also demonstrates strong performance regardless of choice of vegetable oil alkyl ester (soybean oil methyl ester, canola oil methyl ester, castor oil methyl ester), vegetable oil (soybean oil, canola oil) and cationic polyacrylamide (regular charge or higher charge).
  • numerous different vegetable oil alkyl esters, optional vegetable oils, and/or surfactants may be used to achieve superior and unexpected results over what the skilled person would anticipate.
  • Example 7 birch pitch extract was used in evaluations wherein Formulation E and Polymer B are used, as described above. Formulation E and Polymer B were added together in a first example 7 and also added separately in a second example 7. Testing was repeated at low active dosage (combined actives were 0.5 Ib/ton) and at high active dosage (combined actives were 1.0 Ib/ton). In one case, Formulation E was added to the 0.5% cellulosic slurry at pH 11 and then the second component Polymer B product was added after 60 minutes mixing followed by pH neutralization to 4.5. In an alternative case both Formulation E and Polymer B are added together at pH 4.5.

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Abstract

Un procédé de réduction de contaminants dans un procédé de mise en pâte ou de fabrication de papier comprend les étapes consistant à : obtenir une pâte lignocellulosique comprenant des fibres lignocellulosiques et au moins un contaminant hydrophobe ; obtenir un polymère cationique ; obtenir un mélange de nettoyage comprenant un ester alkylique d'huile végétale et au moins un tensioactif ; et appliquer le polymère cationique et le mélange de nettoyage à la pâte lignocellulosique pour réduire une teneur du ou des contaminants hydrophobes dans la pâte ou le procédé de fabrication de papier.
PCT/US2022/075618 2021-08-31 2022-08-29 Procédé de réduction de contaminants hydrophobes dans un procédé de mise en pâte ou de fabrication de papier WO2023034766A1 (fr)

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US20140069599A1 (en) * 2011-10-27 2014-03-13 Buckman Laboratories International, Inc. Method And Composition For Enzymatic Treatment Of Fiber For Papermaking, And Paper Products Made Therewith
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