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WO2020251463A1 - Fibres produites à partir de déchets cellulosiques recyclés - Google Patents

Fibres produites à partir de déchets cellulosiques recyclés Download PDF

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Publication number
WO2020251463A1
WO2020251463A1 PCT/SE2020/050599 SE2020050599W WO2020251463A1 WO 2020251463 A1 WO2020251463 A1 WO 2020251463A1 SE 2020050599 W SE2020050599 W SE 2020050599W WO 2020251463 A1 WO2020251463 A1 WO 2020251463A1
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WO
WIPO (PCT)
Prior art keywords
cellulosic
process according
intermediate product
recycled
purified
Prior art date
Application number
PCT/SE2020/050599
Other languages
English (en)
Inventor
Lars Stigsson
Original Assignee
Treetotextile Ab
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 Treetotextile Ab filed Critical Treetotextile Ab
Priority to EP20823521.8A priority Critical patent/EP3983583A4/fr
Publication of WO2020251463A1 publication Critical patent/WO2020251463A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B16/00—Regeneration of cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
    • C08B15/05—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur
    • C08B15/06—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur containing nitrogen, e.g. carbamates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/08—Cellulose derivatives
    • C08L1/22—Cellulose xanthate
    • C08L1/24—Viscose
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/06—Wet spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F13/00—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like
    • D01F13/02—Recovery of starting material, waste material or solvents during the manufacture of artificial filaments or the like of cellulose, cellulose derivatives or proteins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/02—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from solutions of cellulose in acids, bases or salts
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/30—Polymeric waste or recycled polymer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/22—Cellulose xanthate
    • C08J2301/24—Viscose
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
    • 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

Definitions

  • Fibers produced from recycled cellulosic waste material are Fibers produced from recycled cellulosic waste material
  • the present disclosure describes the manufacturing of regenerated cellulosic fibers from recycled cellulose material such as waste paper, recycled cotton and viscose textile material.
  • the manufacturing process involves pre-treatment of the cellulose feedstock in order to purify the cellulose material prior to dissolving the substantially pure cellulose in sodium hydroxide thereby forming a spin dope.
  • the textile fiber manufacturing process further comprises regenerating new cellulose fibers in an alkaline coagulation bath followed by washing, stretching, and drying of the produced fibers. Sodium hydroxide solvent is recovered and recycled to the dissolving step for dissolving substantially pure cellulose.
  • Regenerated cellulosic fibers herein are defined as cellulosic fibers comprising more than 85 % by weight of cellulose.
  • Cellulose is derived from D-glucose units, which condense through (l->4)-glycosidic bonds. This linkage motif contrasts with that for a (I- >4)-glycosidic bonds present in starch, glycogen, and other carbohydrates.
  • Cellulose is a straight chain polymer: unlike starch, no coiling or branching occurs, and the molecule adopts an extended and rather stiff rod-like conformation, aided by the equatorial conformation of the glucose residues.
  • the multiple hydroxyl groups on the glucose from one chain form hydrogen bonds with oxygen atoms on the same or on a neighbor chain.
  • Celluloses are well known and are described, for example, in Encyclopedia of Polymer Science and Technology, 2nd edition, 1987.
  • Celluloses are natural carbohydrate high polymers (polysaccharides) consisting of anhydroglucose units joined by an oxygen linkage to form long molecular chains that are essentially linear.
  • Cellulose can be hydrolyzed to form glucose.
  • the degree of polymerization (DP) ranges from 1000 for wood pulp to 3500 for cotton fiber, giving a molecular weight of from 160,000 to 560,000.
  • Cellulose can be extracted from several types of vegetable tissues (wood, grass, and cotton).
  • cellulose has chain length or degree of polymerization (DP), the number of glucose units that make up one polymer molecule.
  • DP degree of polymerization
  • Cellulose from wood pulp has typical chain lengths between 300 and 1700 units; cotton and other plant fibers as well as bacterial cellulose have chain lengths ranging from 800 to 10,000 units.
  • Plant-derived cellulose is usually found in a mixture with hemicellulose, lignin, pectin and other substances, while bacterial cellulose is quite pure, has a much higher water content and higher tensile strength due to higher chain lengths.
  • Cellulose is a natural compound with use in paper and textile products.
  • Cotton is a cellulosic material used primarily in textile applications.
  • waste paper and waste textile material is generated, and it is desirable to establish methods and processes for conversion of waste cellulose into new consumer products such as textile fibers.
  • the disclosure is directed to an efficient and environmentally superior process for manufacturing of textile fibers from cellulosic waste and residue streams.
  • Cellulosic waste material may comprise mechanical pulp, recycled paper, waste paper, recycled cellulosic textiles including cotton and viscose fibers, recycled carton board, and mixtures of such wastes.
  • Such waste materials are optionally deinked before subjected to further processing by any of pre-treatment steps.
  • Methods for the manufacturing of a dissolving pulp from recycled cotton is known from e.g. the disclosure of EP3339504A1 where such dissolving pulp is used for producing regenerated cellulose molded bodies and lyocell or viscose fibers.
  • the present invention is directed to a process for the production of regenerated cellulosic fibers from a cellulosic spin dope, said process comprising the steps of:
  • step d) may be performed in alkaline conditions or acidic conditions, or in fact in both, that is where at least one step is performed in an alkaline condition and at least one step is performed in an acidic condition.
  • the cellulosic waste material is described as feed cellulose material (or just‘feedstock’).
  • feed cellulose material used for manufacturing of new high-quality fibers needs to be pre-treated prior to being dissolved in a suitable cellulose solvent.
  • Such pre-treatment of the feed cellulose material may consist of treatment in several stages to remove ash, lignin and/or hemicellulose.
  • the pre-treatment yields substantially pure alfa cellulose, preferably cellulose having an alfa cellulose content exceeding 85 % by weight of dry cellulose.
  • the pre-treatment more preferably yields alfa cellulose content over 90 % by weight of dry cellulose. Pre-treatment procedures are further described below.
  • the molecular weight of cellulose may be reduced to the desirable range by at least one of: chlorine dioxide, oxidation with oxygen and/or strong oxidants such as ozone or hydrogen peroxide under alkaline or acidic conditions, enzymatic treatment, hydrolysis (acid or alkaline catalyzed), physical/mechanical degradation (e.g., via the thermomechanical energy input of the processing equipment) such as for example steam explosion treatment, or combinations thereof.
  • oxidant alone or together with a metal such as iron or manganese may be introduced into an alkaline oxygen
  • delignification stage to achieve the desired level of depolymerization of the cellulose.
  • a chloride dioxide stage may be operated at harsher acidic conditions.
  • the cellulose feed material may be purified and hydrolyzed to the desired DP level by treatment with acids such as sulfuric acid, washing the pulp, and thereafter dissolving the pulp in the solvent.
  • acids such as sulfuric acid
  • the exact chemical nature of the cellulose and molecular weight reduction method is not critical as long as the average molecular weight is in an acceptable range (i.e. with a degree of polymerization (DP) in a suitable range (further described below)).
  • the cellulosic waste material has a lignin content of up to 20 % by weight
  • the cellulosic waste material is subjected to chemical delignification with an alkaline cooking chemical, such as sodium hydroxide, for reducing the lignin content to less than 10 % by weight, or preferably less than 5 % by weight.
  • the delignification process may be carried out using at least one of kraft pulping, soda pulping, or oxygen delignification.
  • substituted cellulose can be used in part or in all of the cellulose used for manufacturing a cellulosic spin dope.
  • chemical modifications of cellulose typically include one or more of carbamatization, etherification and esterification. Substitution or derivatization of cellulose may be performed in any step prior to dissolution in the cellulose solvent forming the spin dope.
  • the cellulose content of the cellulose dope is above about 5 % by weight of the spin dope, while keeping the dissolution ratio of the cellulose in the alkaline solvent at 99.0% by weight or more.
  • the hydroxyl groups of the cellulose in the cellulose slurry may be partially modified by reaction with a reagent which is reactive with a hydroxyl group in the presence of an alkali
  • the cellulose content of the cellulose dope is usually in the range of from 5 to 7% by weight.
  • the cellulose content of the cellulose dope can usually be increased to the range of from 7 to 12% by weight.
  • the spin dope composition comprises from about 5 to about 12 %, preferably from about 5 to about 9 % of cellulose or derivatized cellulose.
  • the coagulation and fiber washing is performed under alkaline conditions. This enables the recovery and recycling of solvent sodium hydroxide. It has been shown that coagulation and fiber regeneration is a rather slow process and that it is advantageous to wash the nascent fibers in the form of a tow and to stretch the tow or filaments prior to cutting.
  • the alkaline washing and/or stretching stages can be followed by acidic wash stages prior to cutting.
  • additives such as sodium sulfate or carbonates are present in the coagulation bath to increase ionic strength of the coagulation liquid and to promote deswelling and transport of solvent out from the nascent cellulosic fiber filaments or fiber tow.
  • the present invention is directed to recycling, recovering and thus recovery of
  • step c) and/ or d) is recovered and recycled to step b).
  • the recycled cellulosic waste material is obtained from waste paper, recycled cotton and/or a viscose textile material or a combination thereof. According to one preferred embodiment of the present invention, the recycled cellulosic waste material is obtained from a viscose textile material. Therefore, according to one embodiment the recycled cellulosic waste material comprises viscose. Moreover, according to yet another embodiment of special interest, the recycled cellulosic waste material comprises at least 50 wt%, preferably at least 70 wt% viscose material.
  • any cotton or polyester fibers present in the feedstock may be, at least partially separated prior to dissolution of the treated fibers in the solvent.
  • a viscose textile material it should be noted that this implies a material comprising viscose, e.g. at least 50% or more, such as up to a very high proportion of viscose.
  • the purified cellulosic intermediate product charged to step b) predominantly originates from viscose fibers textile material.
  • the recycled cellulosic waste material has been pre-treated by removal of button(s) and/or zipper(s).
  • step c) comprises injecting the cellulosic spin dope into a film forming device to form cellulosic films. Moreover, according to yet another embodiment, step c) comprises injecting the cellulosic spin dope through nozzles forming a nonwoven cellulosic product.
  • the purified cellulosic intermediate product has at least one of: a brightness exceeding SIS 88, a lignin content below about 10 %, and a degree of polymerization (DP) in the range of 150-500, preferably having a lignin content below about 10 %.
  • the purified cellulosic acid is purified. According to one embodiment of the present invention, the purified cellulosic acid
  • intermediate product has a degree of polymerization (DP) in the range of 150-500, preferably in the range of 185 - 325.
  • DP degree of polymerization
  • the molecular weight of a cellulose substrate may be determined by using intrinsic viscosity (IV). This may e.g. be
  • DP polymerization
  • IV intrinsic viscosity
  • the purified cellulosic intermediate product has an intrinsic viscosity (IV) of between 100 - 700 mL/g, preferably 150 - 400 mL/g, more preferably 150 - 250 mL/g.
  • IV value in the purified cellulosic intermediate product is in the range of 190 - 220, such as 200 - 210, after adaptation.
  • step c) is performed in an alkaline coagulation bath.
  • step d) is performed under alkaline conditions.
  • the present invention also embodies using an acidic bath in step c) and/or d), either in both these steps or in any of them.
  • step b) electrolysis is applied for the recovery of sodium hydroxide in step b) and further. If a fully acidic condition is applied, then it is preferred to also use electrolysis to recover the alkaline substance(s), such as sodium hydroxide.
  • step a) comprises at least one of:
  • the treating of step a) comprises alkaline extraction and/or steam explosion treatment (STEX) with or without sulphur dioxide addition, preferably at least alkaline extraction.
  • the alkaline extraction may be performed with sodium hydroxide and optional additives including sodium sulfide, glycerol and ethanol.
  • a STEX pre-treatment may be performed by the addition of ethanol or sulphur dioxide.
  • an acidic wash is performed with sulfuric acid.
  • a bleaching is suitably carried out with oxidative chemicals selected from the group of peroxides and peracids, chlorine dioxide, hypochlorite and ozone and combinations thereof, and optionally said bleached pulp is subjected to alkaline extraction, in order to reduce the lignin content of the fibers.
  • step a) further comprises reacting the purified cellulosic intermediate product with urea such that the purified cellulosic intermediate product is a purified cellulose carbamate intermediate product.
  • the alkaline liquor of step b) suitably comprises sodium hydroxide.
  • the alkaline liquor of step b) comprises optional additives such as zinc compounds or urea.
  • sodium hydroxide is a preferred solvent for dissolving cellulose to form a spin dope according to the present invention.
  • at least one chemical used in step c) and/ or d) and being recovered and recycled to step b) is at least sodium hydroxide.
  • sodium hydroxide is recovered by means of evaporation or electrolysis. Either of evaporation or electrolysis is fully possible, and the alternatives may be preferred depending on other conditions. As hinted above, when using an acidic bath, then electrolysis is preferred.
  • the cellulosic spin dope formed in step b) comprises between 5% to 12 % cellulose based on the total weight of the cellulosic spin dope.
  • the sodium hydroxide concentration in the spin dope is in the range of 5-10 wt%.
  • the spin dope may comprise Zn compounds or urea.
  • the purified cellulosic intermediate product prior to dissolving in step b) comprises below 1 wt% lignin, Moreover, the purified cellulosic intermediate product may be subjected to an acid treatment to remove ash before step b).
  • the purified cellulosic intermediate product prior to dissolving in step b) exhibits at least one of the following properties:
  • lignin content of less than 0.7 wt%, in particular a lignin content of 0.3 to 0.6 wt%;
  • the present invention is also directed to spun fibers produced by the process according to the present invention, where the spun fibers have a titer in the range of 0.5 to 3 dtex, preferably 0.8 to 1.5 dtex. Moreover, the spun fibers suitably have conditioned dry tenacities > 18 cN/tex, preferably > 25 cN/tex.
  • the present invention also provides use of spun fibers produced by the process according to the present invention, for the preparation of a textile fiber product. Moreover, the present invention is also directed to the use of spun fibers produced by the process according to the present invention, for the preparation of nonwovens. Description of the figure and related material
  • cellulosic feedstock (1 ) is charged to one or more pre-treatment steps (2) in order to produce substantially pure dissolving grade cellulose.
  • the substantially pure dissolving grade cellulose is then charged into cellulose dissolving step (3).
  • a sodium hydroxide solution (9), recycled from the chemicals recycling plant (13), is also charged into the cellulose dissolving step (3).
  • Make up sodium hydroxide (and optional other additives such as ZnO) (7) is charged to cellulose dissolving step (3) as needed to balance any losses of sodium compounds in the overall process.
  • Cellulose spin dope discharged from the cellulose dissolving step (3) is charged trough filtration and deaeration units (not shown) into the spinning/fiber regeneration plant (4) comprising spinnerets for injection of spin dope into an alkaline coagulation bath.
  • Regenerated cellulosic fibers are washed/stretched/dried/cut in several process steps represented by units in block (5) in Figure 1.
  • Fresh wash liquid (water) is charged to washing steps in (5) through line (12) and spent chemicals from spinning plant (4 and 5) is discharged through line (1 1 ) and charged to the chemicals recycling plant (13).
  • Any salts used to support coagulation and fiber formation in (4) is recovered from the spent spinning liquid and charged to unit (4) through line (10).
  • Wash liquids and sludges (8) are discharged from cellulose feed pre-treatment steps (2) optionally combined with bleed off streams (14) from the chemicals recycling plant (14).
  • Such streams (8 and/or 14) can advantageously, after concentration, be charged to a chemicals recovery boiler in a kraft or sulphite pulp mill. Alternatively, after removal of metals such as Zn, they can, alone or combined, be charged to a sewer or bio sludge treatment plant.
  • viscose filaments from a filament bobbin and a recycled white garment made from 95% viscose and 5% elastan.
  • the viscose filament had an intrinsic viscosity of 162 ml/g. The filament was cut in shorter pieces, approximately 5 mm, and was swollen in water before the dissolution, while the garment was cut in small squares approximately 10 * 10 mm.
  • Kr (clogging) value (measured according to viscose standard method) for the filament was 1607, while for the garment the value became 1570.
  • Cellulose content in the filament dope was measured to 6.1 %, while for the garment the cellulose concentration was 5.53%.
  • the high Kr values was caused by un-dissolved fibres.
  • the filament dope small filaments were visible, probably due to un-optimized dissolving process.
  • the garment dope clearly visible fibres in other colours were seen (cotton and/or polyester fibres)
  • the undissolved material was separated by fine filtering and a good spindope for the manufacturing of cold alkali textile fibre was obtained.
  • the adapted pulp dope contained 5.97% cellulose while the viscose garment dope contained 5.78%. Clogging value, K r for the adapted pulp was 1236, while for the garment the Kr-value was 1570. Both dopes were filtered before spinning, the adapted pulp with a 30 pm filter while the viscose garment was initially filtered with a 100 pm filter, then 30 miti. The reason for a double filtration of the viscose was that it contained both small amount of elastan synthetic fibres, but also other fibres collected during wearing. This could also cause the high Kr-value.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Artificial Filaments (AREA)

Abstract

La présente invention concerne un procédé de production de fibres cellulosiques régénérées à partir d'une solution de filage cellulosique, ledit procédé comprenant les étapes consistant à traiter des déchets cellulosiques recyclés pour éliminer au moins un élément parmi de la lignine, des hémicelluloses et des contaminants des déchets cellulosiques recyclés, ce qui permet d'obtenir un produit intermédiaire cellulosique purifié, à dissoudre le produit intermédiaire cellulosique purifié en une liqueur alcaline pour former une solution de filage cellulosique, à injecter la solution de filage cellulosique dans un bain de coagulation pour former un câble, à laver et étirer le câble dans des conditions alcalines et/ou des conditions acides et à couper le câble pour former des fibres cellulosiques régénérées.
PCT/SE2020/050599 2019-06-13 2020-06-10 Fibres produites à partir de déchets cellulosiques recyclés WO2020251463A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20823521.8A EP3983583A4 (fr) 2019-06-13 2020-06-10 Fibres produites à partir de déchets cellulosiques recyclés

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1950707-8 2019-06-13
SE1950707 2019-06-13

Publications (1)

Publication Number Publication Date
WO2020251463A1 true WO2020251463A1 (fr) 2020-12-17

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EP (1) EP3983583A4 (fr)
WO (1) WO2020251463A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
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CN113023996A (zh) * 2021-04-08 2021-06-25 河南工业大学 一种粘胶纤维生产中产生的压榨废碱液的循环利用方法
WO2021211046A1 (fr) * 2020-04-17 2021-10-21 Treetotextile Ab Procédé de récupération et de recyclage de produits chimiques dans un procédé de fibre de cellulose régénérée
CN113564731A (zh) * 2021-06-17 2021-10-29 武汉纺织大学 一种回收利用牛仔激光废灰的方法及回收物
WO2022034404A1 (fr) * 2020-08-11 2022-02-17 Grasim Industries Limited Fibres cellulosiques soumises à un recyclage valorisant
CN115182062A (zh) * 2021-04-07 2022-10-14 河北吉藁化纤有限责任公司 一种利用旧棉制品制备再生纤维素纤维的方法及纤维
WO2023047018A1 (fr) 2021-09-21 2023-03-30 Upm-Kymmene Corporation Procédé de préparation d'une solution de filage alcaline de cellulose
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WO2024038227A1 (fr) 2022-08-19 2024-02-22 Andritz Oy Système de décoloration de matériau comprenant de la cellulose
EP4399360A1 (fr) * 2021-09-09 2024-07-17 Infinited Fiber Company Oy Procédé de traitement d'une matière première fibreuse

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WO2022034404A1 (fr) * 2020-08-11 2022-02-17 Grasim Industries Limited Fibres cellulosiques soumises à un recyclage valorisant
CN115182062A (zh) * 2021-04-07 2022-10-14 河北吉藁化纤有限责任公司 一种利用旧棉制品制备再生纤维素纤维的方法及纤维
CN113023996A (zh) * 2021-04-08 2021-06-25 河南工业大学 一种粘胶纤维生产中产生的压榨废碱液的循环利用方法
CN113564731A (zh) * 2021-06-17 2021-10-29 武汉纺织大学 一种回收利用牛仔激光废灰的方法及回收物
EP4399360A1 (fr) * 2021-09-09 2024-07-17 Infinited Fiber Company Oy Procédé de traitement d'une matière première fibreuse
WO2023047018A1 (fr) 2021-09-21 2023-03-30 Upm-Kymmene Corporation Procédé de préparation d'une solution de filage alcaline de cellulose
WO2023218125A1 (fr) * 2022-05-10 2023-11-16 Upm-Kymmene Corporation Procédé de préparation d'une solution de filage alcaline de cellulose
WO2024038227A1 (fr) 2022-08-19 2024-02-22 Andritz Oy Système de décoloration de matériau comprenant de la cellulose
SE545655C2 (en) * 2022-10-06 2023-11-28 Re Newcell Ab Method for manufacturing a product comrpising recycled fibers by filtration and acid treatment of a viscose dope
SE2251160A1 (en) * 2022-10-06 2023-11-28 Re Newcell Ab Method for manufacturing a product comrpising recycled fibers by filtration and acid treatment of a viscose dope

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