US20040011482A1 - Method for reducing and /or avoiding the build-up of wood components - Google Patents
Method for reducing and /or avoiding the build-up of wood components Download PDFInfo
- Publication number
- US20040011482A1 US20040011482A1 US10/148,210 US14821002A US2004011482A1 US 20040011482 A1 US20040011482 A1 US 20040011482A1 US 14821002 A US14821002 A US 14821002A US 2004011482 A1 US2004011482 A1 US 2004011482A1
- Authority
- US
- United States
- Prior art keywords
- wood
- process according
- volatile
- plant
- gas
- 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.)
- Abandoned
Links
Images
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 a process for avoiding and/or reducing deposits of volatile and non-volatile wood constituents in gas-bearing systems, wherein the volatile wood constituents undergo at least partial condensation in the gas-bearing systems.
- the present invention also relates to a process for reducing and/or avoiding deposits of wood constituents on machines and/or plant components used in the production of wood fiber from wood chips.
- the present invention therefore is based on the object of providing a process that would at least reduce deposits of volatile and/or non-volatile wood constituents in gas-bearing systems.
- said object is accomplished by means of a process for avoiding and/or reducing deposits of volatile and non-volatile wood constituents in gas-bearing systems, wherein at least some of the volatile wood constituents undergo at least partial condensation in the gas-bearing systems, and the gas contains at least one compound which
- volatile wood constituents are all those wood constituents exhibiting a vapor pressure at temperatures above 20° C.
- Reaction products in the meaning of the invention are any products forming volatile wood constituents upon condensation, e.g. as a result of polymerization.
- Condensed volatile wood constituents and the reaction products thereof frequently form a tacky film on the surfaces of gas-bearing systems and therefore, the deposits generally include non-volatile wood constituents as well, e.g. fine wood particles precipitating from the gas stream and adhering to the tacky films.
- said compound exhibits condensation characteristics similar to those of the wood constituents, i.e., the compound and wood constituents undergo condensation preferably at the same location in the gas-bearing system, preferably forming a film there.
- the compound preferably is a dicarboxylic ester. More preferably, said dicarboxylic ester is a dicarboxylic acid dialkyl and/or diisoalkyl ester of C 2 -C 12 dicarboxylic acids with C 1 -C 13 n- and/or isoalkanols, 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, diisoamyl adipate, din-hexyl adipate, di(2-ethylbutyl
- the compound be a di-n-alkyl adipate and/or a diisoalkyl adipate. Most preferably, the compound is di-n-butyl adipate.
- the process according to the invention is suitable in avoiding and reducing deposits of volatile or non-volatile wood constituents in gas-bearing systems of any type.
- the gas-bearing systems preferably are part of:
- a wood processing plant particularly a plant for producing wood fiber material and/or wood fiber boards
- the gas-bearing system is part of a plant for producing thermomechanical pulp (TMP), or a chip refiner plant such as described in WO 96/41914 which hereby is incorporated by reference and is thus deemed part of the disclosure.
- TMP thermomechanical pulp
- chip refiner plant such as described in WO 96/41914 which hereby is incorporated by reference and is thus deemed part of the disclosure.
- the gas flowing through the gas-bearing pipings can be any gas, but preferably includes water vapor.
- the compound is metered into the gas in gaseous state.
- the compound may also be metered into the gas in liquid state, being transformed to the gaseous state therein.
- Metering preferably is effected continuously.
- the amount of compound metered depends on the concentration of the volatile wood constituents in the gas and on the gas volume flow.
- concentration preferably is 100-5000 ppm, more preferably 200-2000 ppm, with 300-1000 ppm being particularly preferred.
- the amount of compound metered into the gas is such that no deposits of volatile or non-volatile compounds and/or reaction products thereof will form on the surfaces of the gas-bearing systems, or compounds already having formed will be removed and/or dissolved. Consequently, metering of the compound preferably is subject to automatic control.
- the pressure drop in the piping of the gas-bearing system and/or the separation efficiency of cyclones present in the gas-bearing system are taken as control parameters. It is also preferred to use the gas volume flow and the concentration of volatile wood constituents in the gas, or the surface deposit as control parameters.
- the above-mentioned production processes are performed in the presence of water, the water being at least partially evaporated and therefore, in another preferred embodiment of the process according to the invention, the compound is metered directly into the water. In this event, the compound must also be steam-volatile.
- the present invention is advantageous in that the gas-bearing systems require less frequent cleaning, and the plants therefore have longer operating life. For example, cyclones are no longer clogged by deposits, so that their separation capability is maintained. Deposits already existing are reduced. It is another object of the present invention to provide a process for reducing and/or avoiding deposits of wood constituents on machines and/or plant components used in the production of wood fiber from wood chips (chips).
- said object is accomplished by means of a process for reducing and/or avoiding deposits of wood constituents on machines and/or plant components used in the production of wood fiber materials from wood chips, wherein the wood is defiberized in the presence of at least one compound which:
- Deposits in the meaning of the invention are any deposits of wood constituents in gas-bearing and/or water-bearing systems and/or on other components of plants or machinery used in the production of wood fiber materials.
- the compound preferably is a dicarboxylic ester. More preferably, said dicarboxylic ester is a dicarboxylic acid dialkyl and/or diisoalkyl ester of C 2 -C 12 dicarboxylic acids with C 1 -C 13 n- and/or isoalkanols, 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, diisoamyl adipate, din-hexyl adipate, di(2-ethylbutyl
- the compound be a di-n-alkyl adipate and/or a diisoalkyl adipate. Most preferably, the compound is di-n-butyl adipate.
- esters may be employed alone or in combination with water-soluble or water-insoluble solvents as an anhydrous or aqueous solution or as an aqueous dispersion, preferably emulsion.
- Suitable solvents are n- and isoalkanols, liquid hydrocarbons, acetone, and other well-known solvents.
- natural oils or modified natural oils such as rape oil methyl ester are used.
- Non-ionogenic, ionic and amphoteric, particularly non-ionic surfactants are used as emulsifiers in the production of the dispersions.
- suitable non-ionic emulsifiers are oxyalkyl ethers, preferably oxyethylates and/or terminally blocked oxyethylates of fatty alcohols and fatty acids or oils.
- Alkyl- and/or arylsulfonates, ⁇ -olefinsulfonates, ⁇ -sulfofatty acid esters, sulfosuccinic acid esters, as well as alkyl sulfates and ether sulfates, as well as carboxymethylated oxyethylates and soaps are suitable as anionic emulsifiers.
- the preparation of the preferably stable emulsions is well-known.
- the hydrophobic phase is added to the aqueous phase containing the emulsifier and dispersed with stirring or pump-circulating.
- the plant for producing the wood fiber materials has at least one refiner such as known from WO 96/41914 or from WO 96/35016.
- refiner such as known from WO 96/41914 or from WO 96/35016.
- the dicarboxylic ester is preferably metered into the refiner together with the clear filtrate. Said metering preferably is effected in a continuous fashion.
- the dicarboxylic ester concentration in the first refiner is 100-5000 ppm, more preferably 200-2000 ppm, with 300-1000 ppm being particularly preferred.
- the process according to the invention is suitable for any type of machine and plant used in wood defiberizing.
- the machines and/or plants are preferably part of the TMP process or of a process such as described in WO 96/41914.
- FIG. 1 shows a process flow chart for the production of thermomechanical pulp (TMP).
- TMP thermomechanical pulp
- Purified chips are fed into the 1 st refiner stage and reduced mechanically therein in the presence of clear filtrate and 330 ppm of TALLOFIN® TMP.
- TALLOFIN® TMP is a product of Stockhausen GmbH & Co. KG, which contains 40 wt.-% of di-n-butyl adipate and 60 wt.-% of a non-ionogenic emulsifier.
- the TALLOFIN® TMP is metered into the clear filtrate before the latter flows into the refiner.
- the exceedingly high energy input (up to 22 MW) gives rise to temperatures of more than 200° C.
- the steam is removed from the refiner through steam pipings and fed into a heat recovery.
- the steam also contains a certain percentage of di-n-butyl adipate, so that the steam pipings, the cyclones and control elements in the steam pipings show no or merely minor deposits. Also, no or massively reduced deposits of wood constituents are formed in the refiner itself, so that the refiner requires less frequent cleaning and the service life of the milling equipment is increased.
- the wood fibers are reduced mechanically in the 2 nd refiner stage once more, before they are subjected to further treatment well-known to those skilled in the art.
- the steam also contains a certain percentage of di-n-butyl adipate, so that the steam pipings, the cyclones and control elements in the steam pipings show no or merely minor deposits.
- no or massively reduced deposits of wood constituents are formed in this refiner itself, so that it requires less frequent cleaning and the service life of the milling equipment is increased.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Golf Clubs (AREA)
- Adhesives Or Adhesive Processes (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19959826.6 | 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 (1)
Publication Number | Publication Date |
---|---|
US20040011482A1 true US20040011482A1 (en) | 2004-01-22 |
Family
ID=7932319
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/148,210 Abandoned US20040011482A1 (en) | 1999-12-10 | 2000-11-29 | Method for reducing and /or avoiding the build-up of wood components |
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 (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5080759A (en) * | 1990-09-04 | 1992-01-14 | Quaker Chemical Corporation | Method for controlling stickies in pulp and papermaking processes using recycled paper |
US5246548A (en) * | 1992-01-13 | 1993-09-21 | Dearborn Chemical Company Limited | Pitch control |
US5256252A (en) * | 1992-07-15 | 1993-10-26 | Nalco Chemical Company | Method for controlling pitch deposits using lipase and cationic polymer |
US5474655A (en) * | 1993-04-08 | 1995-12-12 | Henkel Kommanditgesellschaft Auf Aktien | Process for controlling the deposition of stickies from paper stock suspensions |
US5762757A (en) * | 1996-12-05 | 1998-06-09 | Betzdearborn Inc. | Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
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 |
US5846308A (en) * | 1996-02-02 | 1998-12-08 | Hercules Incorporated | Emulsifier system for rosin sizing agents |
US5863385A (en) * | 1995-05-31 | 1999-01-26 | Stockhausen Gmbh & Co. Kg | Use of agents in the manufacture of pulp and paper |
US5885419A (en) * | 1996-07-09 | 1999-03-23 | Betzdearborn Inc. | Methods for inhibiting organic contaminant deposition in pulp and papermaking systems |
US5952394A (en) * | 1995-04-12 | 1999-09-14 | Betzdearborn Inc. | Compositions and methods for inhibiting the deposition of organic contaminants 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 |
US6156387A (en) * | 1996-04-26 | 2000-12-05 | Stockhausen Gmbh & Co. Kg | Process for surface treatment of material webs, in particular paper and cardboard webs, using adhesive agents |
US6256387B1 (en) * | 1999-07-06 | 2001-07-03 | Chin-Yang Wang | Device rack |
US6344108B1 (en) * | 1997-02-04 | 2002-02-05 | Stockhausen Gmbh & Co. Kg | Using a dicarboxylic acid dialkyl ester brightening |
US6558513B1 (en) * | 2001-05-29 | 2003-05-06 | Hercules Incorporated | Non-aqueous release from paper machine equipment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2735300C2 (de) * | 1977-08-05 | 1982-03-25 | Konrad 6380 Bad Homburg Mattern | Verfahren zum Behandeln von flüssigen Abfällen |
DE3809663A1 (de) * | 1988-03-23 | 1989-10-12 | Metallgesellschaft Ag | Verfahren zur verminderung von ablagerungen in anlagen zur eindampfung von sulfitablaugen |
BR9606439A (pt) * | 1995-06-12 | 1998-07-14 | Sprout Bauer Inc Andritz | Processo de produzir pasta a partir de material ligno-celulósico contendo fibras em um sistemas de refino dotado de um refinador primário |
-
1999
- 1999-12-10 DE DE19959826A patent/DE19959826A1/de not_active Ceased
-
2000
- 2000-11-29 US US10/148,210 patent/US20040011482A1/en not_active Abandoned
- 2000-11-29 EP EP00993298A patent/EP1252388B1/de not_active Expired - Lifetime
- 2000-11-29 WO PCT/EP2000/011926 patent/WO2001042555A2/de active IP Right Grant
- 2000-11-29 DE DE50006708T patent/DE50006708D1/de not_active Expired - Lifetime
- 2000-11-29 AU AU28376/01A patent/AU2837601A/en not_active Abandoned
- 2000-11-29 AT AT00993298T patent/ATE268406T1/de active
- 2000-11-29 RU RU2002117417/12A patent/RU2002117417A/ru unknown
- 2000-11-29 CA CA002394173A patent/CA2394173A1/en not_active Abandoned
- 2000-11-29 CN CN00816924A patent/CN1409783A/zh active Pending
- 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 (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5080759A (en) * | 1990-09-04 | 1992-01-14 | Quaker Chemical Corporation | Method for controlling stickies in pulp and papermaking processes using recycled paper |
US5246548A (en) * | 1992-01-13 | 1993-09-21 | Dearborn Chemical Company Limited | Pitch control |
US5256252A (en) * | 1992-07-15 | 1993-10-26 | Nalco Chemical Company | Method for controlling pitch deposits using lipase and cationic polymer |
US5474655A (en) * | 1993-04-08 | 1995-12-12 | Henkel Kommanditgesellschaft Auf Aktien | Process for controlling the deposition of stickies from paper stock suspensions |
US5952394A (en) * | 1995-04-12 | 1999-09-14 | Betzdearborn Inc. | Compositions and methods for inhibiting the deposition of organic contaminants in pulp and papermaking systems |
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 |
US5866618A (en) * | 1995-04-12 | 1999-02-02 | Betzdearborn Inc. | Compositions and Methods for inhibiting the deposition of organic contaminants in pulp and papermaking systems |
US5863385A (en) * | 1995-05-31 | 1999-01-26 | Stockhausen Gmbh & Co. Kg | Use of agents in the manufacture of pulp and paper |
US5846308A (en) * | 1996-02-02 | 1998-12-08 | Hercules Incorporated | Emulsifier system for rosin sizing agents |
US6156387A (en) * | 1996-04-26 | 2000-12-05 | Stockhausen Gmbh & Co. Kg | Process for surface treatment of material webs, in particular paper and cardboard webs, using adhesive agents |
US5885419A (en) * | 1996-07-09 | 1999-03-23 | 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 |
US6344108B1 (en) * | 1997-02-04 | 2002-02-05 | Stockhausen Gmbh & Co. Kg | Using a dicarboxylic acid dialkyl ester brightening |
US6113738A (en) * | 1998-03-16 | 2000-09-05 | Nalco Chemical Company | Use of additives to breakdown and stabilize wax during fiber recycle |
US6248793B1 (en) * | 1998-03-16 | 2001-06-19 | Nalco Chemical Company | Contaminant dispersants useful in recycling of treated containers |
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 |
Also Published As
Publication number | Publication date |
---|---|
WO2001042555A3 (de) | 2001-12-06 |
AU2837601A (en) | 2001-06-18 |
RU2002117417A (ru) | 2004-01-27 |
EP1252388B1 (de) | 2004-06-02 |
DE50006708D1 (de) | 2004-07-08 |
CA2394173A1 (en) | 2001-06-14 |
CN1409783A (zh) | 2003-04-09 |
NO322867B1 (no) | 2006-12-18 |
NO20022676L (no) | 2002-06-06 |
EP1252388A2 (de) | 2002-10-30 |
NO20022676D0 (no) | 2002-06-06 |
ATE268406T1 (de) | 2004-06-15 |
DE19959826A1 (de) | 2001-06-28 |
WO2001042555A2 (de) | 2001-06-14 |
TW541382B (en) | 2003-07-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: STOCKHAUSEN GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VON MEDVEY, INGO;RAJCSANYI, THOMAS;OPALKA, ANDREAS;AND OTHERS;REEL/FRAME:013359/0771;SIGNING DATES FROM 20020423 TO 20020619 |
|
AS | Assignment |
Owner name: ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC, O Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STOCKHAUSEN GMBH;REEL/FRAME:017870/0643 Effective date: 20060531 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |