EP1252388B1 - Verwendung einer verbindung zur verminderung und/oder vermeidung von ablagerungen von holzinhaltsstoffen - Google Patents
Verwendung einer verbindung zur verminderung und/oder vermeidung von ablagerungen von holzinhaltsstoffen Download PDFInfo
- Publication number
- EP1252388B1 EP1252388B1 EP00993298A EP00993298A EP1252388B1 EP 1252388 B1 EP1252388 B1 EP 1252388B1 EP 00993298 A EP00993298 A EP 00993298A EP 00993298 A EP00993298 A EP 00993298A EP 1252388 B1 EP1252388 B1 EP 1252388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- acid ester
- volatile
- use according
- compound
- 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.)
- Expired - Lifetime
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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
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/226—Use of compounds avoiding scale formation
Definitions
- the present invention relates to the avoidance and / or reduction of deposits of volatile and non-volatile wood constituents in gas-carrying systems, the volatile wood constituents at least partially condensing in the gas-carrying systems.
- the present invention further relates to the reduction and / or avoidance of deposits of wood constituents on machines and / or system parts for the production of wood fibers from wood chips.
- EP-A-0 334 098 describes a method for reducing deposits in Equipment for the evaporation of waste liquors from wood pulp production by Sulfite waste liquor low molecular weight polyacrylic acid is added.
- the deposits are gypsum or silicate deposits that fail during the process.
- US-A-5 762 757 describes a method of preventing deposits organic pulp ingredients such as pitch and sticky Contamination in pulp or paper making systems by a anionic surfactant from the group of Dinonyl sulfosuccinates or a mixture of Dioctyl sulfosuccinate and didecyl sulfosuccinate are either added to the pulp or is applied to the surface of the system.
- DE-A-27 35 300 A describes a method for the aftertreatment of vapor condensate for the distillative removal and burning of steam-volatile oxygen-consuming substances, from liquids and wet combustion non-volatile components. Part of the substances present in the wood are volatile in water and are present in the vapor condensate. In the process the substances are burned at over 1000 ° C.
- WO-A-98/33970 describes a process for the production of fibrous materials for the Production of pulp, paper or wood-based panels, in which the Pretreatment for impregnating dicarboxylic acid dialkyl esters and / or one or several fatty acid polyol mono, di, tri and / or higher polyesters and / or Polyester-polyether copolymers are added. These components clean the Primary fibers from resin components and other wood constituents and cause one higher yield and better optics.
- the present invention is therefore based on the object of a method for To provide with the deposition of volatile and / or non-volatile Wood ingredients in gas-carrying systems is at least reduced.
- Volatile wood constituents in the sense of the invention are all wood constituents that Temperatures above 20 ° C have a vapor pressure.
- reaction products within the meaning of the invention are any products that contain the volatile wood constituents after the condensation, e.g. B. by polymerization.
- the deposits usually have non-volatile wood constituents, e.g. B. fine Wood particles, which separate from the gas stream and sticky films adhere.
- connection has a similar condensation behavior like the wood ingredients; d. H. the connection and the wood constituents condense preferably at the same point in the gas-carrying system and preferably form there a movie.
- the compound is preferably a dicarboxylic acid ester.
- the dicarboxylic acid ester is a dicarboxylic acid dialkyl and / or diisoalkyl ester of C2-C12 Dicarboxylic acids with C1-C13 n- and / or iso-alkanols such as di-n-butyl oxalate, di-n-butyl malonate, Di-n-butyl succinate, di-n-butyl glutarate, di-n-butyl adipate, di-n-butyl suberate, Di-n-butyisebacate, dimethyl adipate, di-n-propyl adipate, diisopropyl adipate, Diisobutyl adipate, di-tert-butyl adipate, di-isoamyl adipate, di-n-hexyl adipate, di- (2-ethylbutyl
- the compound is very particularly preferably a di-n-alkyladipic acid ester and / or a di-iso-alkyl adipic acid ester.
- the most preferred is the compound n-dibutyl adipate.
- the gas-carrying system is very particularly preferably part of a plant for the production from Thermo-Mechanical-Pulp (TMP) or a wood chip refiner system, as described in WO-A-96/41914, which is hereby introduced as a reference becomes.
- TMP Thermo-Mechanical-Pulp
- WO-A-96/41914 WO-A-96/41914
- the gas that flows through the gas-carrying lines can be any gas be, but preferably has water vapor.
- the compound is preferably metered into the gas in gaseous form.
- the specialist realizes that the compound can also be metered into the gas in the liquid state can and then there is converted into a gaseous state.
- the dosage is preferably carried out continuously.
- the dosage of the compound depends on the concentration of the volatile wood constituents in the gas and the gas volume flow.
- The is preferably Concentration 100-5000 ppm, particularly preferably 200-2000 ppm and very particularly preferably 300-1000 ppm.
- the compound is preferably metered into the gas in such an amount that there are no deposits of volatile or non-volatile compounds and / or form their reaction products on the surfaces of the gas-carrying systems or that deposits already formed detach and / or dissolve again. Accordingly the dosage of the compound is preferably regulated automatically.
- the pressure loss in the pipelines is preferably used as the control parameter the gas-carrying system and / or the degree of separation of cyclones, which are in the gas-carrying system. Are also preferred as Control parameters also the gas volume flow and the concentration of volatile Wood ingredients used in the gas or the area coverage.
- connection also be steam-volatile.
- the present invention has the advantage that the gas-carrying systems are less common must be cleaned and the systems therefore have a longer operating time. There z. B. Cyclones are no longer added by deposits, their separability remains receive. Existing deposits are reduced.
- Another object of the present invention is to provide a method to reduce and / or avoid deposits of wood constituents on machines and / or system parts for the production of wood fibers Wood chips (wood chips).
- Deposits in the sense of the invention are any deposits of wood constituents in gas-carrying systems and / or on other systems or Machine parts that are used for the production of wood fiber materials.
- the compound is preferably a dicarboxylic acid ester.
- the dicarboxylic acid ester is a dicarboxylic acid dialkyl and / or diisoalkyl ester of C2-C12 Dicarboxylic acids with C1-C13 n- and / or iso-alkanols such as di-n-butyl oxalate, di-n-butyl malonate, Di-n-butyl succinate, di-n-butyl glutarate, di-n-butyl adipate, di-n-butyl suberate, Di-n-butyl sebacate, dimethyl adipate, di-n-propyl adipate, diisopropyl adipate, Diisobutyl adipate, di-tert-butyl adipate, di-isoamyl adipate, di-n-hexyl adipate, di- (2-ethylbutyl
- the compound is very particularly preferably a di-n-alkyladipic acid ester and / or a di-iso-alkyl adipic acid ester.
- the most preferred is the compound Di-n-butyl adipate.
- esters can be used alone or in combination with water-soluble or water-insoluble ones
- Solvents as water-free or water-containing solution or as water-containing Dispersion, preferably emulsion, are used.
- Suitable solvents are n- and iso-alkanols, liquid hydrocarbons, acetone and others known solvents, in particular natural oils or modified natural oils, such as beet oil methyl ester.
- Nonionic, ionic and Amphoteric, especially nonionic, surfactants are used as emulsifiers.
- Suitable nonionic emulsifiers are, for example, oxalkyl ethers, preferably Oxethylates and / or terminally blocked oxethylates of fatty alcohols and Fatty acids or oils.
- anionic emulsifiers are alkyl and / or Aryl sulfonates, ⁇ -olefin sulfonates, ⁇ -sulfofatty acid esters, sulfosuccinic acid esters and Alkyl sulfates and ether sulfates as well as carboxymethylated oxethylates and soaps suitable.
- the preparation of the preferably stable emulsions is known. For example, the hydrophobic phase in the aqueous emulsifier-containing phase registered and dispersed with stirring and pumping.
- the plant for producing wood fiber materials preferably has at least a refiner on how he z. B. from WO-A-96/41914 or from WO-A-96/35016 is. These patent applications are hereby introduced for reference.
- the diacid carboxylic ester is preferably used together with the clear filtrate dosed into the refiner.
- the metering is preferably carried out continuously.
- the dicarboxylic acid ester concentration is in the first refiner 100-5000 ppm, particularly preferably 200-2000 ppm and whole particularly preferably 300-1000 ppm.
- the use according to the invention is suitable for machines and systems for Wood fiberization of any kind.
- the machines and / or systems are preferred however part of the TMP process or a process as described in WO-A-96/41914 is described.
- the runtimes of machines and systems succeed extend considerably to the production of wood fiber materials.
- the plants are easier to regulate and the service life of the refiner's grinding set can be extended become.
- the method according to the invention can be integrated into existing systems become. Deposits already present are removed by the inventive Use reduced.
- FIG. 1 shows a process flow diagram for the production of thermo-mechanical pulp (TMP).
- TMP thermo-mechanical pulp
- Cleaned wood chips are conveyed to the 1st refiner stage and mechanically broken down there in the presence of clear filtrate and 330 ppm TALLOFIN® TMP.
- TALLOFIN® TMP is a product of Stockhausen GmbH & Co. KG, which contains 40% by weight di-n-butyl adipate and 60% by weight of a nonionic emulsifier.
- the TALLOFIN® TMP is dosed into the clear filtrate before it flows into the refiner.
- the very high energy input creates temperatures of up to 200 ° C and pressures of 2-3 bar in the refiner (up to 22 MW), so that a considerable part of the water evaporates in the refiner.
- the steam is removed from the refiner through steam lines and fed to heat recovery.
- the steam also contains a certain proportion of di-n-butyl adipate, so that the steam lines, the cyclones and the regulating elements in the steam lines have no or only slight deposits. But even in the refiner itself, no or to a much reduced extent deposits of wood constituents form, so that it has to be cleaned less frequently and the service life of the grinding set is increased.
- the wood fibers are mechanically comminuted again in the second refiner stage before they are then subjected to the further treatment known to the person skilled in the art.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Golf Clubs (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
Die vorliegende Erfindung betrifft ferner die Verminderung und/oder Vermeidung von Ablagerungen von Holzinhaltsstoffen an Maschinen und/oder Anlagenteilen zur Herstellung von Holzfasern aus Holzschnitzeln.
- ein ähnliches Kondensationsverhalten aufweist wie die flüchtigen Holzinhaltsstoffe,
- Ablagerungen von flüchtigen Holzinhaltsstoffen und/oder deren Reaktionsprodukten zumindest vermindert.
- Holzverarbeitungsanlage, insbesondere einer Anlage zur Herstellung von Holzfaserstoff und/oder Holzfaserplatten,
- Anlage zu Herstellung von Zellstoff,
- Zellstoffverarbeitungsanlage,
- Papier- oder Kartonherstellungsanlage und/oder
- Anlage zur Herstellung von Teilen oder Gegenständen aus Formfasem.
- auf den Oberflächen der Maschinen und/oder Anlagenteile einen Film bildet und
- Ablagerungen von flüchtigen Holzinhaltsstoffen und/oder deren Reaktionsprodukten zumindest vermindert.
Nach der Zerfaserung im ersten Refiner werden die Holzfasern in der 2. Refinerstufe noch einmal mechanisch zerkleinert, bevor sie dann der dem Fachmann bekannten weiteren Behandlung unterzogen werden. Auch in der 2. Refinerstufe entstehen große Mengen Dampf, die der Wärmerückgewinnung zugeführt werden. Der Dampf enthält wiederum neben flüchtigen und nicht flüchtigen Holzinhaltsstoffen auch einen gewissen Anteil an Di-n-butyladipat, so daß die Dampfleitungen, die Zyklone und die Regelorgane in den Dampfleitungen keine oder nur geringe Beläge aufweisen. Aber auch in diesem Refiner selbst bilden sich keine bzw. in stark reduziertem Maß Ablagerungen von Holzinhaltsstoffen, so daß dieser seltener gereinigt werden muß und die Standzeit der Mahlgamitur erhöht wird.
Claims (14)
- Verwendung einer Verbindung zur Vermeidung und/oder Verminderung von Ablagerungen von flüchtigen und nicht flüchtigen Holzinhaltsstoffen in gasführenden Systemen bei der Bearbeitung von Holz, der Produktion und Verarbeitung von Zellstoff und/oder der Papier-, Karton- oder Formfaserherstellung, wobei flüchtige Holzinhaltsstoffe zumindest teilweise in den gasführenden Systemen kondensieren, dadurch gekennzeichnet, dass die Verbindung:ein ähnliches Kondensationsverhalten aufweist wie die flüchtigen Holzinhaltsstoffe,Ablagerungen von flüchtigen Holzinhaltsstoffen und/oder deren Reaktionsprodukten zumindest vermindert unddie Verbindungen in das Gas dosiert oder in eine bei der Bearbeitung von Holz, der Produktion und Verarbeitung von Zellstoff und/oder der Papier-, Karton- oder Formfaserherstellung auftretende wässrige Phase dosiert wird.
- Verwendung nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindung ein Dicarbonsäureester ist.
- Verwendung nach Anspruch 2, dadurch gekennzeichnet, daß der Dicarbonsäureester ein Di-n-alkyladipinsäureester und/oder ein Diisoalkyladipinsäureester ist.
- Verwendung nach Anspruch 2, dadurch gekennzeichnet, daß der Dicarbonsäureester Dibutyladipat ist.
- Verwendung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das gasführende System Teil einer:Holzverarbeitungsanlage, insbesondere einer Anlage zur Herstellung von Holzfaserstoff und/oder Holzfaserplatten,Anlage zu Herstellung von Zellstoff,Zellstoffverarbeitungsanlage,Papier- oder Kartonherstellungsanlage und/oderAnlage zur Herstellung von Teilen und/oder Gegenständen aus Formfasern
- Verwendung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Gas Wasserdampf aufweist.
- Verwendung einer Verbindung zur Verminderung und/oder Vermeidung von Ablagerungen von Holzinhaltsstoffen an Maschinen und/oder Anlagenteilen zur Herstellung von Holzfaserstoffen aus Holzschnitzeln, dadurch gekennzeichnet, daß die Zerfaserung des Holzes in Gegenwart mindestens der Verbindung erfolgt, dieauf den Oberflächen der Maschinen und/oder Anlagenteile einen Film bildet undAblagerungen von flüchtigen Holzinhaltsstoffen und/oder deren Reaktionsprodukten zumindest vermindert.
- Verwendung nach Anspruch 7, dadurch gekennzeichnet, daß die Verbindung ein Dicarbonsäureester ist.
- Verwendung nach Anspruch 8, dadurch gekennzeichnet, daß der Dicarbonsäureester ein Di-n-alkyladipinsäureester und/oder ein Diisoalkyladipinsäureester ist.
- Verwendung nach Anspruch 8, dadurch gekennzeichnet, daß der Dicarbonsäureester Dibutyladipat ist.
- Verwendung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß die Maschinen und/oder Anlagenteile zur Herstellung von Holzfaserstoffen aus Holzschnitzeln mindestens einen Refiner aufweisen.
- Verwendung nach Anspruch 11, dadurch gekennzeichnet, daß der Dicarbonsäureester in den ersten Refiner vorzugsweise zusammen mit dem Klarfiltrat dosiert wird.
- Verwendung nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die Konzentration des Dicarbonsäureesters 100 - 5000, vorzugsweise 200-2000 ppm, besonders bevorzugt 300 - 1000 ppm beträgt.
- Verwendung nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, daß die Maschinen und/oder Anlagenteile Bestandteile einer Anlage zur Herstellung von Thermo-Mechanical-Pulp sind.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19959826 | 1999-12-10 | ||
DE19959826A DE19959826A1 (de) | 1999-12-10 | 1999-12-10 | Verfahren zur Verminderung und/oder Vermeidung von Ablagerungen von Holzinhaltsstoffen |
PCT/EP2000/011926 WO2001042555A2 (de) | 1999-12-10 | 2000-11-29 | Verfahren zur verminderung und/oder vermeidung von ablagerungen von holzinhaltsstoffen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1252388A2 EP1252388A2 (de) | 2002-10-30 |
EP1252388B1 true EP1252388B1 (de) | 2004-06-02 |
Family
ID=7932319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00993298A Expired - Lifetime EP1252388B1 (de) | 1999-12-10 | 2000-11-29 | Verwendung einer verbindung zur verminderung und/oder vermeidung von ablagerungen von holzinhaltsstoffen |
Country Status (11)
Country | Link |
---|---|
US (1) | US20040011482A1 (de) |
EP (1) | EP1252388B1 (de) |
CN (1) | CN1409783A (de) |
AT (1) | ATE268406T1 (de) |
AU (1) | AU2837601A (de) |
CA (1) | CA2394173A1 (de) |
DE (2) | DE19959826A1 (de) |
NO (1) | NO322867B1 (de) |
RU (1) | RU2002117417A (de) |
TW (1) | TW541382B (de) |
WO (1) | WO2001042555A2 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2735300A1 (de) * | 1977-08-05 | 1979-02-08 | Konrad Mattern | Bruedenkondensatnachbehandlung |
WO1998033970A1 (de) * | 1997-02-04 | 1998-08-06 | Stockhausen Gmbh & Co. Kg | Verfahren zur herstellung von faserstoffen mit verbesserten eigenschaften |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3809663A1 (de) * | 1988-03-23 | 1989-10-12 | Metallgesellschaft Ag | Verfahren zur verminderung von ablagerungen in anlagen zur eindampfung von sulfitablaugen |
US5080759A (en) * | 1990-09-04 | 1992-01-14 | Quaker Chemical Corporation | Method for controlling stickies in pulp and papermaking processes using recycled paper |
CA2059256A1 (en) * | 1992-01-13 | 1993-07-14 | David Arthur Aston | Pitch control |
US5256252A (en) * | 1992-07-15 | 1993-10-26 | Nalco Chemical Company | Method for controlling pitch deposits using lipase and cationic polymer |
DE4311598A1 (de) * | 1993-04-08 | 1994-10-13 | Henkel Kgaa | Verfahren zur Kontrolle des Absetzens klebender Verunreinigungen aus Papierstoff-Suspensionen |
US5779858A (en) * | 1995-04-12 | 1998-07-14 | Betzdearborn Inc. | Deposition control in pulp and papermaking systems using a composition comprising of polyvinyl alcohol and gelatin |
US5723021A (en) * | 1995-04-12 | 1998-03-03 | Betzdearborn Inc. | Method for inhibiting deposition in pulp and papermaking systems using a composition comprising of polyvinyl alcohol, gelatin and cationic polymer |
DE19519268C1 (de) * | 1995-05-31 | 1997-01-23 | Stockhausen Chem Fab Gmbh | Verwendung von Mitteln zur Zellstoff- und Papierherstellung |
EP0775232B2 (de) * | 1995-06-12 | 2003-05-02 | Andritz Sprout-Bauer, Inc. | Raffinierung von holzspänen unter kurzer verweildauer, hoher temperatur und bei hoher geschwindigkeit |
EP0877840A1 (de) * | 1996-02-02 | 1998-11-18 | Hercules Incorporated | Emulgatorsystem für kolophoniumleimungsmittel |
DE19616733C2 (de) * | 1996-04-26 | 2000-07-13 | Stockhausen Chem Fab Gmbh | Verfahren zur thermisch-mechanischen Oberflächenbehandlung von flächenförmigen Materialbahnen, insbesondere aus Papier und Karton unter Verwendung von Abhäsivmitteln |
US5746888A (en) * | 1996-07-09 | 1998-05-05 | Betzdearborn Inc. | Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
US5762757A (en) * | 1996-12-05 | 1998-06-09 | Betzdearborn Inc. | Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
US6113738A (en) * | 1998-03-16 | 2000-09-05 | Nalco Chemical Company | Use of additives to breakdown and stabilize wax during fiber recycle |
US6256387B1 (en) * | 1999-07-06 | 2001-07-03 | Chin-Yang Wang | Device rack |
US6558513B1 (en) * | 2001-05-29 | 2003-05-06 | Hercules Incorporated | Non-aqueous release from paper machine equipment |
-
1999
- 1999-12-10 DE DE19959826A patent/DE19959826A1/de not_active Ceased
-
2000
- 2000-11-29 RU RU2002117417/12A patent/RU2002117417A/ru unknown
- 2000-11-29 EP EP00993298A patent/EP1252388B1/de not_active Expired - Lifetime
- 2000-11-29 CA CA002394173A patent/CA2394173A1/en not_active Abandoned
- 2000-11-29 WO PCT/EP2000/011926 patent/WO2001042555A2/de active IP Right Grant
- 2000-11-29 AU AU28376/01A patent/AU2837601A/en not_active Abandoned
- 2000-11-29 CN CN00816924A patent/CN1409783A/zh active Pending
- 2000-11-29 DE DE50006708T patent/DE50006708D1/de not_active Expired - Lifetime
- 2000-11-29 AT AT00993298T patent/ATE268406T1/de active
- 2000-11-29 US US10/148,210 patent/US20040011482A1/en not_active Abandoned
- 2000-12-06 TW TW089125951A patent/TW541382B/zh active
-
2002
- 2002-06-06 NO NO20022676A patent/NO322867B1/no not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2735300A1 (de) * | 1977-08-05 | 1979-02-08 | Konrad Mattern | Bruedenkondensatnachbehandlung |
WO1998033970A1 (de) * | 1997-02-04 | 1998-08-06 | Stockhausen Gmbh & Co. Kg | Verfahren zur herstellung von faserstoffen mit verbesserten eigenschaften |
Also Published As
Publication number | Publication date |
---|---|
EP1252388A2 (de) | 2002-10-30 |
DE50006708D1 (de) | 2004-07-08 |
US20040011482A1 (en) | 2004-01-22 |
AU2837601A (en) | 2001-06-18 |
NO20022676L (no) | 2002-06-06 |
TW541382B (en) | 2003-07-11 |
ATE268406T1 (de) | 2004-06-15 |
CA2394173A1 (en) | 2001-06-14 |
DE19959826A1 (de) | 2001-06-28 |
NO322867B1 (no) | 2006-12-18 |
WO2001042555A2 (de) | 2001-06-14 |
WO2001042555A3 (de) | 2001-12-06 |
CN1409783A (zh) | 2003-04-09 |
NO20022676D0 (no) | 2002-06-06 |
RU2002117417A (ru) | 2004-01-27 |
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