AU708427B2 - Cellulose moulded body and process for its production - Google Patents
Cellulose moulded body and process for its production Download PDFInfo
- Publication number
- AU708427B2 AU708427B2 AU11325/97A AU1132597A AU708427B2 AU 708427 B2 AU708427 B2 AU 708427B2 AU 11325/97 A AU11325/97 A AU 11325/97A AU 1132597 A AU1132597 A AU 1132597A AU 708427 B2 AU708427 B2 AU 708427B2
- Authority
- AU
- Australia
- Prior art keywords
- pulp
- chlorine
- bleached
- bleaching
- fibres
- 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.)
- Ceased
Links
Classifications
-
- 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
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/50—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs by irradiation or ozonisation
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Materials For Medical Uses (AREA)
- Artificial Filaments (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
The invention relates to a process for producing cellulose moulded articles of high brightness, the process being characterised by the following combination of measures: pulp is bleached with a bleaching agent which must not contain chlorine or any chlorine compound; the pulp once bleached is dissolved in an aqueous tertiary amine oxide to produce a mouldable cellulose solution; and the mouldable cellulose solution is worked into moulded articles.
Description
WO 97/23666 PCT/AT96/00257 -2a precipitation bath, wherein the cellulose is precipitated.
Afterwards, the cellulose fibres obtained are washed.
To avoid an undesired discolouration of the fibres, primarily due to lignin and coloured organic compounds, it is known to bleach the pulp before processing it. For this purpose, raw pulp is reacted with a number of bleaching agents such as elemental chlorine, chlorine compounds such as hypochlorite and chlorine dioxide, oxygen, peroxide and ozone, under exactly defined conditions, said reaction being carried out using a combination of these chemicals in a certain order, which is referred to as bleaching sequence.
Classical bleaching processes start using elemental chlorine, which chlorinates or oxidizes to different extents depending on the pH value. Hypochlorite and chlorine dioxide oxidize the lignin and coloured compounds. Between each of the reaction steps of these bleaching agents, usually an alkaline extraction is provided to remove the lignin brought into solution and the other compounds from the reaction medium.
For an overview of the technique of pulp bleaching R.P.
Singh; The Bleaching of Pulp, TAPPI Press, Atlanta, USA, is cited.
During pulp bleaching, chlorine-containing bleaching agents produce to different extents chlorinated products which are hardly degradable and for the most part contaminate waste water. Therefore, these processes give rise to environmental concerns, and the use of chlorine-containing bleaching agents, particularly elemental chlorine, is increasingly restrained. This however implies also a loss of bleaching quality, since elemental chlorine has a high bleaching capacity.
Among the chlorine compounds, chlorine dioxide has a better bleaching capacity than hypochlorite, but it is more expensive than hypochlorite, which is more frequently used.
WO 97/23666 PCT/AT96/00257 -3- In the state of the art, bleaching processes which do not involve any chlorine compounds are also employed. For these processes, combinations of oxygen/peroxide and ozone respectively are used. The pulp thus bleached is referred to as TCF (total chlorine free) pulp, since it is bleached using neither elemental chlorine nor chlorine compounds. On the other hand, in the literature a pulp which isnot bleached using elemental chlorine but chlorine compounds is referred to as ECF (elemental chlorine free) pulp.
For the purposes of this specification, an ECF pulp bleached using hypochlorite is referred to as ECF hypochlorite pulp.
In the state of the art, the so-called brightness is a measure of the intensity of bleaching. It is known from the viscose process that there is a relation between the brightness of a bleached pulp and the brightness of the cellulose products produced from this pulp in such a way that pulps having a higher brightness usually may be processed into fibres having also a higher brightness.
It is the object of the invention to provide a process whereby cellulose moulded bodies may be produced which have a higher brightness than cellulose moulded bodies produced from an ECF hypochlorite pulp, while the pulps used have the same starting brightness and which otherwise the same procedure is employed.
This object is attained by means of a process for the production of cellulose moulded bodies which is characterized by a combination of the steps of bleaching pulp using a bleaching agent, provided that the bleaching agent does not contain chlorine or any chlorine compound, dissolving the pulp bleached using the bleaching agent in an aqueous tertiary amine-oxide, a mouldable cellulose solution being obtained, and s~ -ii.
i wo 97/23666 PCT/AT96/00257 -4processing the mouldable cellulose solution into moulded bodies.
By means of the process according to the invention, it is possible to particularly produce cellulose fibres having a high brightness, as well as cellulose films according to the dry/wet-spinning process.
It is surprising to those skilled in the art that TCF pulps achieve higher fibre brightnesses than ECF hypochlorite pulps when the starting pulps have the same brightness, with the positive side-effect of being able to produce fibres in a particularly environmentally friendly way.
The invention is also concerned with the bleaching of fibres produced according to the amine-oxide process using chlorinefree bleaching agents such as oxygen, ozone and particularly hydrogen peroxide.
A preferred embodiment of the process according to the invention is characterized in that the fibres or films produced according to the invention are bleached using a bleaching agent, provided that the bleaching agent does not contain chlorine or any chlorine compound.
As the tertiary amine-oxide, N-methylmorpholine-N-oxide has shown particularly good results.
The invention is also concerned with cellulose moulded bodies, particularly cellulose fibres and films, having a high brightness, produceable according to the process according to the invention.
Moreover, the invention is concerned with the use of a pulp bleached with a bleaching agent for the production of cellulose moulded bodies according to the amine-oxide process, provided that the bleaching agent does not contain chlorine or any chlorine compound.
r WO 97/23666 PCT/AT96/00257 By means of the following Example and Comparative Example, the invention will be explained in more detail.
Example To produce a TCF pulp, pulp (of the beech sulphite pulp type) first was bleached by means of an alkaline oxygen extraction reinforced by peroxide, afterwards by means of ozone and finally by means of peroxide, according to known processes.
These processes are described for instance in R.P. Singh; The Bleaching of Pulp, TAPPI Press, Atlanta, USA, as well as in EP-A 0 426 652.
The brightness of the TCF pulp obtained, determined according to ISO 3688, was 90.6. The pulp had a rapid cuprammonium viscosity according to Zellcheming ZM IV/30/62 of 19.8 Pa.s, as well as an a content of 90,9.
Thereafter, this TCF pulp was processed in a known way in a stirring vessel into a dope having a composition of 12% of cellulose, 77% of NMMO and 11% of water. The viscosity of the dope was 1630 Pa.s (temp.: 90'C, shearing rate: 0.1 s-1).
The dope was spun into fibres at 120 0 C through a spinneret having spinning holes exhibiting diameters of 100 gm, according to the known wet/dry-spinning process (see e.g. EP- A 0 584 318). The brightness of the fibres produced according to the invention was approximately The CIELAB fibre brightness was determined according to the following method: On the fibres, the colour coordinates Rx, Ry, Rz were determined according to DIN 6174 and DIN 5033 using the light type D65 and at a 10° observation angle. From these colour coordinates, according to DIN 55981 chromaticity deviation according to Gdrtner/Griesser), the CIE brightness and the tint in the red/green-axis may be calculated as follows: WO 97/23666 PCT/AT96/00257 -6- CIE brightness W Y 800* (xo-x) 1 7 0 0 (yO-y) Tint T 900* (xo-x) -650* (yO-y) (Note: T negative red cast, T positive green cast) standard chromaticity for green sensitivity Ry...reflectance value green) xO, standard chromaticity coordinates of the achromatic point (at D65/10' is: xO 0.3138; yO 0.3310) x, standard chromaticity coordinates of the samples; to be calculated according to: x X/(X Y Z) y Y/(X Y Z) z 1 x y The standard chromaticity numbers X, Y, Z appearing in these formulae may be calculated from the reflectance values (=filter values) Rx, Ry, Rz at the light type D65 and a 100 observation angle according to the formulae: X 0.94811 Rx Y Ry Z 1.07304 Rz Subsequently, these fibres were bleached using hydrogen peroxide (1,5 g of H202; stabilizing agent: 0,2 g/l of MgSO 4 pH 10,5; fleet ratio 1:20; 70C; bleaching duration: 3 minutes). The CIELAB brightness of the bleached fibres was 57.
Comparative Example To produce an ECF hypochlorite pulp, first the same starting pulp as in the above Example was bleached by means of an alkaline oxygen extraction reinforced by peroxide, afterwards by means of hypochlorite and finally by means of peroxide.
The brightness of the ECF hypochlorite pulp obtained was 91.6 and thus virtually the same as the one of the TCF pulp produced in the Example.
s WO 97/23666 PCT/AT96/00257 -7- Afterwards, a dope and fibres were produced analogously to the above Example. The fibres produced had a CIELAB brightness of about 39. Thus it becomes clear that the TCF pulp bleached according to the invention without any chlorine compound may be processed into fibres having a higher brightness than the ECF pulp bleached by means of, among other substances, hypochlorite.
Subsequently, the fibres produced were bleached as described in the above Example. The bleached fibres had a CIELAB brightness of about 54.
/Z
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WO 97/23666 PCT/AT96/00257 -8-
CLAIMS:
1. A process for the production of cellulose fibres exhibiting high brightness, characterized by the combination of steps of S bleaching pulp using a bleaching agent, provided that said bleaching agent does not contain chlorine or any chlorine compound, dissolving said pulp bleached using said bleaching agent in an aqueous tertiary amine-oxide, a mouldable cellulose solution being obtained, and processing said mouldable cellulose solution into fibres.
2. A process according to Claim 1, characterized in that said mouldable cellulose solution is processed into fibres according to the dry/wet-spinning process.
3. A process according to Claim 2, characterized in that said fibres are bleached using a bleaching agent, provided that said bleaching agent does not contain chlorine or any chlorine compound.
4. A process according to one of the Claims 1 or 2, characterized in that as said tertiary amine-oxide
N-
methylmorpholine-N-oxide is used.
Use of a pulp bleached using a bleaching agent for the production of cellulose moulded bodies according to the amine-oxide process, provided that said bleaching agent does not contain chlorine or any chlorine compound.
Ni i
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA2099/95 | 1995-12-22 | ||
| AT0209995A AT402827B (en) | 1995-12-22 | 1995-12-22 | CELLULOSE MOLDED BODY AND METHOD FOR THE PRODUCTION THEREOF |
| PCT/AT1996/000257 WO1997023666A1 (en) | 1995-12-22 | 1996-12-19 | Cellulose moulded article and method of producing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU1132597A AU1132597A (en) | 1997-07-17 |
| AU708427B2 true AU708427B2 (en) | 1999-08-05 |
Family
ID=3527728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU11325/97A Ceased AU708427B2 (en) | 1995-12-22 | 1996-12-19 | Cellulose moulded body and process for its production |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0811086B1 (en) |
| JP (1) | JP4326023B2 (en) |
| CN (1) | CN1079848C (en) |
| AT (2) | AT402827B (en) |
| AU (1) | AU708427B2 (en) |
| BR (1) | BR9607326A (en) |
| CA (1) | CA2212995C (en) |
| DE (1) | DE59600279D1 (en) |
| ES (1) | ES2119576T3 (en) |
| HK (1) | HK1018082A1 (en) |
| MX (1) | MX9706413A (en) |
| MY (1) | MY113146A (en) |
| NO (1) | NO310665B1 (en) |
| WO (1) | WO1997023666A1 (en) |
| ZA (1) | ZA9610469B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6605350B1 (en) | 1996-08-23 | 2003-08-12 | Weyerhaeuser Company | Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same |
| DE19948401C1 (en) * | 1999-10-07 | 2001-05-03 | Alceru Schwarza Gmbh | Process for the production of cellulose moldings |
| JP4645093B2 (en) * | 2003-08-13 | 2011-03-09 | 王子製紙株式会社 | Method for producing bleached pulp |
| DE102004024028B4 (en) * | 2004-05-13 | 2010-04-08 | Lenzing Ag | Lyocell method and apparatus with press water return |
| CN100359050C (en) * | 2004-11-16 | 2008-01-02 | 唐山三友集团化纤有限公司 | High whiteness and strength adhesive short fiber and process for making same |
| CN1302160C (en) * | 2005-01-04 | 2007-02-28 | 陈建旭 | Production of fibre from plant stem |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4416698A (en) * | 1977-07-26 | 1983-11-22 | Akzona Incorporated | Shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent and a process for making the article |
| US5145557A (en) * | 1990-02-07 | 1992-09-08 | Lenzing Aktiengesellschaft | Chlorine-free bleaching method for dissolving-grade pulps using an op-z-p sequence |
| US5346588A (en) * | 1989-10-30 | 1994-09-13 | Lenzing Aktiengesellschaft | Process for the chlorine-free bleaching of cellulosic materials with ozone |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL97796C (en) * | 1958-05-29 | |||
| US4246221A (en) * | 1979-03-02 | 1981-01-20 | Akzona Incorporated | Process for shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent |
| GB9103297D0 (en) * | 1991-02-15 | 1991-04-03 | Courtaulds Plc | Fibre production method |
| SE9301160L (en) * | 1992-08-28 | 1994-03-01 | Sunds Defibrator Ind Ab | Process for treating process water |
-
1995
- 1995-12-22 AT AT0209995A patent/AT402827B/en not_active IP Right Cessation
-
1996
- 1996-12-10 MY MYPI96005199A patent/MY113146A/en unknown
- 1996-12-12 ZA ZA9610469A patent/ZA9610469B/en unknown
- 1996-12-19 CN CN96193414A patent/CN1079848C/en not_active Expired - Lifetime
- 1996-12-19 DE DE59600279T patent/DE59600279D1/en not_active Expired - Lifetime
- 1996-12-19 CA CA002212995A patent/CA2212995C/en not_active Expired - Fee Related
- 1996-12-19 AU AU11325/97A patent/AU708427B2/en not_active Ceased
- 1996-12-19 JP JP52314797A patent/JP4326023B2/en not_active Expired - Lifetime
- 1996-12-19 BR BR9607326A patent/BR9607326A/en not_active IP Right Cessation
- 1996-12-19 EP EP96942178A patent/EP0811086B1/en not_active Expired - Lifetime
- 1996-12-19 AT AT96942178T patent/ATE167242T1/en not_active IP Right Cessation
- 1996-12-19 ES ES96942178T patent/ES2119576T3/en not_active Expired - Lifetime
- 1996-12-19 MX MX9706413A patent/MX9706413A/en unknown
- 1996-12-19 WO PCT/AT1996/000257 patent/WO1997023666A1/en active Application Filing
-
1997
- 1997-08-13 NO NO19973720A patent/NO310665B1/en not_active IP Right Cessation
-
1998
- 1998-10-20 HK HK98111355A patent/HK1018082A1/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4416698A (en) * | 1977-07-26 | 1983-11-22 | Akzona Incorporated | Shaped cellulose article prepared from a solution containing cellulose dissolved in a tertiary amine N-oxide solvent and a process for making the article |
| US5346588A (en) * | 1989-10-30 | 1994-09-13 | Lenzing Aktiengesellschaft | Process for the chlorine-free bleaching of cellulosic materials with ozone |
| US5145557A (en) * | 1990-02-07 | 1992-09-08 | Lenzing Aktiengesellschaft | Chlorine-free bleaching method for dissolving-grade pulps using an op-z-p sequence |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2212995C (en) | 2006-09-19 |
| NO973720L (en) | 1997-08-13 |
| CN1079848C (en) | 2002-02-27 |
| WO1997023666A1 (en) | 1997-07-03 |
| NO310665B1 (en) | 2001-08-06 |
| ES2119576T3 (en) | 1998-10-01 |
| CN1182460A (en) | 1998-05-20 |
| JP4326023B2 (en) | 2009-09-02 |
| JPH11501090A (en) | 1999-01-26 |
| MX9706413A (en) | 1997-11-29 |
| CA2212995A1 (en) | 1997-07-03 |
| EP0811086B1 (en) | 1998-06-10 |
| ATE167242T1 (en) | 1998-06-15 |
| NO973720D0 (en) | 1997-08-13 |
| BR9607326A (en) | 1997-12-30 |
| ZA9610469B (en) | 1997-06-24 |
| ATA209995A (en) | 1997-01-15 |
| AU1132597A (en) | 1997-07-17 |
| AT402827B (en) | 1997-09-25 |
| DE59600279D1 (en) | 1998-07-16 |
| HK1018082A1 (en) | 1999-12-10 |
| MY113146A (en) | 2001-11-30 |
| EP0811086A1 (en) | 1997-12-10 |
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