EP4067567A1 - Procédé de défibrage et dispositif d'obtention de nanocellulose - Google Patents

Procédé de défibrage et dispositif d'obtention de nanocellulose Download PDF

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Publication number
EP4067567A1
EP4067567A1 EP20894510.5A EP20894510A EP4067567A1 EP 4067567 A1 EP4067567 A1 EP 4067567A1 EP 20894510 A EP20894510 A EP 20894510A EP 4067567 A1 EP4067567 A1 EP 4067567A1
Authority
EP
European Patent Office
Prior art keywords
solution
nozzle
passage
nanocellulose
frustoconical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20894510.5A
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German (de)
English (en)
Other versions
EP4067567A4 (fr
EP4067567B1 (fr
Inventor
Rafael BARAHONA GONZALEZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graficas Nogueira SLU
Original Assignee
Bio Nc Sl
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 Bio Nc Sl filed Critical Bio Nc Sl
Publication of EP4067567A1 publication Critical patent/EP4067567A1/fr
Publication of EP4067567A4 publication Critical patent/EP4067567A4/fr
Application granted granted Critical
Publication of EP4067567B1 publication Critical patent/EP4067567B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type

Definitions

  • the object of the present invention belongs to the sector for obtaining nanocellulose. It relates to a method for obtaining nanocellulose by means of shredding through the combination of pressure, friction, turbulence, acceleration, speed, decompression, expansion, and collision of cellulose. Although this is performed by means of a mechanical method, it still constitutes an efficient alternative over what is known up until now for obtaining nanocellulose, proposing a method which is based on a highly homogenous cellulose solution in proportions of between 1% and 6% with the rest being water, said solution being subjected to a high pressure to then be passed through a characteristic nozzle in which the solution is subjected to great acceleration in order to reach a high speed (turbulent regimen), which in turn causes a strong friction and turbulence in the outlet of the nozzle, causing the corresponding expansion and decompression as well as the collision of the high-speed fluid such that nanocellulose is obtained with said method.
  • Nanocellulose whose fibers are in turn with homogenous structure and elongated fiber, nano size that
  • the process of the present invention is an evolution of the existing mechanical methods, where it is much more efficient, and therefore entails a significant energy saving for obtaining same and a high degree of result repeatability, without generating any type of waste, utilizing 100% of the treated material.
  • Nanocellulose is produced after reducing cellulose fibers to a nanometric scale. To achieve a scale of between 50 and 100 nanometers, the original fiber must be greatly reduced, and this reduction is not performed efficiently with currently known methods and machines such as those described above.
  • KR 20170142836A discloses a method for producing cellulose fibers, and more particularly a method for producing nanocellulose fibers including the steps of subjecting a solution of cellulose in water to pressure in a chamber compressing the solution, passing the compressed solution through a nozzle with a frustoconical inlet experiencing a strong acceleration, passing through a more restricted area, where it increases the pressure of the solution and friction and collisions occur, giving rise to the shredding and precipitation of the solution in a collecting vessel, causing expansion.
  • the proposal of this invention for obtaining this solution is to use a new mechanical method that will pass the cellulose solution through a first compression step, to then be passed through a small opening arranged in the part which acts as an extrusion head that will be referred to as "nozzle" as it presents the characteristics typical of the passage with an angular inlet and outlet and a cylindrical central portion, causing the strong shredding of the cellulose solution to start in said step of the process.
  • Passage through said nozzle causes a strong acceleration in the solution, which causes a high speed of the solution with significant friction and achieving the turbulent regimen. All this together with the pressure with which it is introduced in the nozzle (between 250 and 600 bar at infeed plus Venturi effect) and significant friction with the walls thereof produces a combined shredding mechanism.
  • the solution moves to the subsequent step of exiting with a high negative pressure and of subsequent expansion, together with a large inertia due to the significant speed acquired to cause a final collision of said solution both against the actual walls of the outlet chamber and against an outlet front dead center.
  • the method object of the present invention is characterized by comprising several steps through which cellulose is converted into nanocellulose and, in that sense, it has:
  • Microcellulose and nanocellulose fibers are obtained with all these steps to which the solution is subjected which, based on the needs and purposes thereof, allows the use of virtually any device which will, however, always present a passage through the nozzle, reproducing the method as many times as deemed appropriate, and with as many passages the nozzle may have and the size thereof, in combination with the different pressures so as to allow obtaining the nanocellulose with more or less crystallization or transparency. All this is achieved, along with a better quality to reach a scale of between 50 and 100 nanometers, greatly reducing the original fiber with great homogeneity.
  • the device Due to the use of liquid solutions in the method, the device is subjected to the laws of fluid thermodynamics, being subjected to significant frictions and change of state of the solution with the corresponding energy transformations, causing heat to be given off (due to the very high friction with the walls of the nozzle), and this will lead to both the chambers and the nozzle itself being complemented with the corresponding cooling arrangements in order to withstand temperature changes with high pressures, frictions, turbulences, speeds, etc., occurring particularly inside the nozzle and during the passage of the solution therethrough with significant shredding during said passage.
  • a nozzle (3) can have one or more passages (4) with their corresponding frustoconical inlets (5) and outlets (6), respectively.
  • Steps two, three, and four can be repeated as many times as deemed appropriate and necessary for obtaining a more homogenous nanocellulose, where the third intermediate step is the step in which the greatest shredding occurs and nanocellulose is obtained.
  • the last step through the conventional (centrifugation) methods separates the solution (1) into water on one hand and nanocellulose on the other. The method for obtaining nanocellulose will thus be completed, obtaining nanocellulose with the characteristics that are deemed appropriate and necessary.
  • This device can be complemented with a cooling system (14) for cooling the entire assembly, i.e., the compression chamber (2), the nozzle (3), and the receiving chamber (7), due to the occurrence of heating which may be too high in some cases, taking into account the pressure (P) and frictions (F) in combination with turbulence (T), the speed (S), as well as the expansion (E) and decompression, so the entire device can or should be cooled to ensure the proper operation thereof.
  • a cooling system (14) for cooling the entire assembly, i.e., the compression chamber (2), the nozzle (3), and the receiving chamber (7), due to the occurrence of heating which may be too high in some cases, taking into account the pressure (P) and frictions (F) in combination with turbulence (T), the speed (S), as well as the expansion (E) and decompression, so the entire device can or should be cooled to ensure the proper operation thereof.
  • the invention relates to a method and device object of the invention for obtaining nanocellulose by means of shredding through the combination of pressure, acceleration, speed, friction, turbulence, expansion, decompression, and collision, in a mechanical and non-chemical manner.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Disintegrating Or Milling (AREA)
EP20894510.5A 2019-11-28 2020-11-25 Procédé de défibrage et dispositif d'obtention de nanocellulose Active EP4067567B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201931057A ES2829173A1 (es) 2019-11-28 2019-11-28 Procedimiento de desfibrado y dispositivo para obtener nanocelulosa
PCT/ES2020/070733 WO2021105538A1 (fr) 2019-11-28 2020-11-25 Procédé de défibrage et dispositif d'obtention de nanocellulose

Publications (3)

Publication Number Publication Date
EP4067567A1 true EP4067567A1 (fr) 2022-10-05
EP4067567A4 EP4067567A4 (fr) 2023-01-25
EP4067567B1 EP4067567B1 (fr) 2024-07-10

Family

ID=76038099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20894510.5A Active EP4067567B1 (fr) 2019-11-28 2020-11-25 Procédé de défibrage et dispositif d'obtention de nanocellulose

Country Status (4)

Country Link
EP (1) EP4067567B1 (fr)
ES (1) ES2829173A1 (fr)
FI (1) FI4067567T3 (fr)
WO (1) WO2021105538A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730252B1 (fr) * 1995-02-08 1997-04-18 Generale Sucriere Sa Cellulose microfibrillee et son procede d'obtention a partir de pulpe de vegetaux a parois primaires, notamment a partir de pulpe de betteraves sucrieres.
ITPR20070080A1 (it) 2007-10-23 2009-04-24 Niro Soavi Spa Valvola omogeneizzante
US20090314864A1 (en) * 2008-06-19 2009-12-24 George Kruse Hydraulic jet mill
GB0908401D0 (en) * 2009-05-15 2009-06-24 Imerys Minerals Ltd Paper filler composition
IT1395630B1 (it) 2009-09-10 2012-10-16 Gea Niro Soavi S P A Ora Gea Mechanical Equipment Italia S P A Omogeneizzatore ad alta pressione con riduttore epicicloidale
JP2013104142A (ja) * 2011-11-11 2013-05-30 Daicel Corp セルロース系不織布及びその製造方法並びにセパレータ
KR102315015B1 (ko) * 2016-06-20 2021-10-21 한국전자통신연구원 나노 셀룰로오스 섬유 제조 방법
JP7193827B2 (ja) 2017-08-28 2022-12-21 増幸産業株式会社 摩砕機

Also Published As

Publication number Publication date
FI4067567T3 (fi) 2024-10-08
EP4067567A4 (fr) 2023-01-25
EP4067567B1 (fr) 2024-07-10
ES2829173A1 (es) 2021-05-28
WO2021105538A1 (fr) 2021-06-03

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