US20030000661A1 - Removal of water-soluble compounds from wood chips prior to cooking - Google Patents
Removal of water-soluble compounds from wood chips prior to cooking Download PDFInfo
- Publication number
- US20030000661A1 US20030000661A1 US10/159,292 US15929202A US2003000661A1 US 20030000661 A1 US20030000661 A1 US 20030000661A1 US 15929202 A US15929202 A US 15929202A US 2003000661 A1 US2003000661 A1 US 2003000661A1
- Authority
- US
- United States
- Prior art keywords
- wood chips
- water
- aqueous treatment
- wash
- treatment stream
- 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
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Classifications
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- 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
Definitions
- the present invention relates generally to the field of wood chip treatments.
- the present invention relates to treatment of wood chips prior to cooking in a pulp manufacturing process.
- water soluble metal compounds such as manganese, calcium, potassium and the like should be removed prior to cooking of wood chips so as to ensure that the resulting pulp may be more easily bleached.
- manganese is especially harmful to the bleaching process and is known to cause poor bleaching results.
- the removal of calcium results in reduced scaling in the digester and evaporators.
- the present invention is embodied in processes whereby wood chips are treated prior to cooking so as to remove substantially (e.g., at least about 30 wt. %, more preferably at least about 50 wt. % and most preferably at least 70 wt. %) water-soluble compounds, especially those compounds which disassociate in water to form potassium and/or chloride ions.
- substantially e.g., at least about 30 wt. %, more preferably at least about 50 wt. % and most preferably at least 70 wt. %) water-soluble compounds, especially those compounds which disassociate in water to form potassium and/or chloride ions.
- wood chips entering the cooking system contain water-soluble compounds, such as those compounds which disassociate in water to form potassium and/or chloride ions.
- wood chips are treated prior to cooking by being brought into contact with an aqueous treatment stream (e.g., water or steam condensate) so as to reduce substantially (e.g., at least about 30 wt. %) such potassium- or chloride-containing water-soluble compounds.
- an aqueous treatment stream e.g., water or steam condensate
- substantially e.g., at least about 30 wt. %
- water-soluble compounds, specifically potassium- or chloride-containing water-soluble compounds present in the wood chips are displaced from the interior of the chips and accumulate in the aqueous treatment liquid present.
- the aqueous treatment liquid containing the water-soluble compounds may then be drained from the chips prior to the chips entering the cooking system. These wood chips can be treated (washed) multiple times so as to sequentially increase the amount of water-soluble compounds, specifically potassium- and/or chloride-containing compounds, removed therefrom.
- FIGS. 1 - 3 each represent a schematic view of a possible wood chip treatment technique in accordance with the present invention
- FIGS. 4A and 4B are graphical plots in accordance with the Examples below of potassium and chloride ion concentrations (mg/L) in chip filtrate versus leach time for 2-3 mm unsteamed and steamed wood chips, respectively;
- FIGS. 5A and 5B are graphical plots in accordance with the Examples below of potassium and chloride ion concentrations (mg/L) in chip filtrate versus leach time for 4-6 mm unsteamed and steamed wood chips, respectively;
- FIGS. 6A and 6B are graphical plots in accordance with the Examples below of potassium and chloride ion concentrations (mg/L) in chip filtrate versus leach time for 8-10 mm unsteamed and steamed wood chips, respectively; and
- FIG. 7 is plot of the percentage of total potassium removed from three different wood chip size categories in accordance with the Examples below.
- the aqueous wash stream that may be employed in the practice of the present invention can be virtually any stream which is capable of being processed in the pulp mill's existing wastewater treatment system. Such streams include, but are not limited to, water, evaporator (and/or other mill) condensates, collected rainwater, and bleach plant effluent.
- the wash may advantageously be carried out at temperatures between about 20° C. to about 120° C. (e.g., advantageously between about 30° C. to about 90° C.), at pressures up to the operating pressure of the downstream digester.
- the residence time in which the wood chips may be in contact with the aqueous wash liquid can be from about 2 to about 200 minutes.
- the wash is most preferably conducted at a pH of between about 2 to about 12, and more preferably between about 4 to about 10. It is especially preferred that the wash be conducted at elevated pressures which, as noted above, can be up to the pressure condition of the downstream digester.
- one system 10 includes a chip bin 12 , such as disclosed in U.S. Pat. No. 5,500,083 (the entire content of which is expressly incorporated hereinto by reference) and available commercially from Andritz Inc. of Glens Falls, N.Y. as Diamondback® Steaming Vessel. Steam may be injected into the wood chips contained within the chip bin 12 via line 12 - 1 .
- the chip bin 12 is provided with a meter screw 14 , such that condensate is capable of being drained therefrom via line 16 . Such drained condensate may then be sent to the pulp mill's existing wastewater treatment system (not shown).
- the chip bin 12 shown in FIG. 1 could, if desired, be provided without steaming, but with a meter screw and a horizontally or vertically disposed wash vessel (not shown) downstream of the meter screw where wash liquid may be introduced.
- the wash effluent may thus be drained from the wash vessel and processed in the pulp mill's existing wastewater treatment system.
- the system 20 shown in FIG. 2 includes a similar chip bin 12 as depicted in FIG. 1, in that it is steam may be injected into the wood chips contained therein by line 22 - 1 and that it is provided with a meter screw 24 .
- the chip bin 22 is provided with a plurality of serially arranged horizontally or vertically disposed wash vessels 25 , 26 downstream thereof where wash liquid may be introduced.
- the chips may be washed with water or other suitable aqueous stream via line 27 .
- the liquid may be drained from an initial one of the wash vessels 25 via line 25 - 1 and then directed to a second downstream wash vessel 26 where the chips are washed a second time.
- Liquid drained from the second wash vessel may be divided into respective portions, with one portion thereof being employed as wastewater treatment via line 26 - 1 , and another portion thereof used to flow counter-current via line 26 - 2 with the wood chips in the first wash vessel 25 .
- each one has the ability to gather the drained wash liquid and return it to the preceding wash vessel or be sent to the pulp mill's existing wastewater treatment system.
- the last wash vessel in the series could be, for example, an in-line separator, while an intermediate wash vessel could be a retention vessel to increase the retention time of wash material in contact with wood chips.
- an intermediate wash vessel could be a retention vessel to increase the retention time of wash material in contact with wood chips.
- Such a system 30 is depicted in the embodiment depicted in accompanying FIG. 3.
- the final chip wash could occur physically in the top-separator of the digester.
- the chip bin 32 includes a meter screw 34 and is provided with a line 32 - 2 to allow steam injection into the wood chips contained therein.
- a series of wash vessels 35 , 36 and 37 are provided to allow the wood chips to be sequentially washed in countercurrent fashion via fresh wash water supplied via lines 39 - 1 , 39 - 2 and 39 - 3 , respectively.
- the last wash vessel 37 in the series could be, for example, an in-line separator.
- a retention vessel 40 is preferably interposed in the chip flow between the initial was vessel 35 and the intermediate wash vessel 36 . The retention vessel serves to increase the retention time of wash material in contact with wood chips.
- Liquid drained from the intermediate and final wash vessels 36 , 37 may be divided into respective portions, with one portion thereof being employed as wastewater treatment via lines 36 - 1 and 37 - 1 , respectively, and another portion thereof used to flow counter-current via lines 36 - 2 and 37 - 2 with the wood chips in the first and intermediate wash vessels 35 and 36 , respectively.
- the wash vessels 36 , 37 in the system 30 shown in FIG. 3 has the ability to gather the drained wash liquid and return it to the preceding wash vessel or be sent to the pulp mill's existing wastewater treatment system.
- water-soluble potassium can be removed from wood chips. More specifically, in laboratory experiments carried out at atmospheric pressure and at temperatures ranging from 30° C. to 90° C. with wash liquid contact time of about 30 minutes, potassium-containing compounds may be reduced substantially in an amount of at least about 30 wt. % (e.g., between about 30 wt. % to about 40 wt. %).
- the operational conditions used in the laboratory experiments were selected due to the practical limitations existing in the laboratory and are thus non-limiting to the present invention. That is, other operational conditions may be employed within the context of the present invention. Based on the results of the laboratory experiments, it is expected that potassium removal will increase at higher temperatures and/or operating pressures. It is also expected that the commercial operating conditions will be different from those used in the laboratory, specifically higher temperature, higher pressure and longer retention time.
- Chips were tested for moisture content before any treatment was performed. Chips were separated into two portions—that is, one portion for those chips to be pre-treated with steam prior to the leaching treatment and another portion for those chips to be treated only by the leaching treatment (i.e., without any steam pre-treatment). The condensate formed during the steaming treatment was drained and tested for potassium content. Chips to be pre-treated with steam were segregated into three different chip size categories—that is, chips having a size, on average, of 2-3 mm, 4-6 mm and 8-10 mm, respectively. Numerous bags containing 50 g of wood chips for each chip size category were prepared.
- Respective bags of wood chips were then subjected to each of three different temperature regimes (i.e., 30° C., 60° C. and 90° C.) and five different retention time regimes (i.e., 1 min., 2 min., 5 min., 10 min. and 30 min.).
- a total of 45 bags of chips was prepared for the steamed wood chips.
- the same procedures as described above were also followed for preparation of wood chip-containing bags for the non-steam pre-treated chips.
- a container of water was heated to the desired temperature (i.e., 30° C., 60° C. and 90° C.). Once at temperature, a bag of chips was introduced and held at temperature for the desired retention time. After reaching the desired retention time, the heating was terminated and the filtrate tested for chloride and potassium content.
- Standard Method 4500 (Standard Methods, 18 th Ed., Meruric Nitrate Method 4500-Cl, Section C, 1992) was used for chlorides and Standard Method 3111 was used for potassium (Standard Methods, 18 th Ed., Metals by Flame Atomic Absorption Spectrometry 3111 A & B, 1992)
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- Paper (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/159,292 US20030000661A1 (en) | 2001-06-22 | 2002-06-03 | Removal of water-soluble compounds from wood chips prior to cooking |
JP2002174678A JP2003020582A (ja) | 2001-06-22 | 2002-06-14 | 木材チップを蒸解処理する前に処理する方法 |
FI20021152A FI20021152A (sv) | 2001-06-22 | 2002-06-14 | Förfarande och system för behandling av flis före kokning |
CA002390742A CA2390742C (en) | 2001-06-22 | 2002-06-17 | Removal of water-soluble compounds from wood chips prior to cooking |
SE0201891A SE528163C2 (sv) | 2001-06-22 | 2002-06-20 | Avlägsnande av vattenlösliga föreningar ur träflis före kokningen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US29977001P | 2001-06-22 | 2001-06-22 | |
US10/159,292 US20030000661A1 (en) | 2001-06-22 | 2002-06-03 | Removal of water-soluble compounds from wood chips prior to cooking |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030000661A1 true US20030000661A1 (en) | 2003-01-02 |
Family
ID=26855812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/159,292 Abandoned US20030000661A1 (en) | 2001-06-22 | 2002-06-03 | Removal of water-soluble compounds from wood chips prior to cooking |
Country Status (5)
Country | Link |
---|---|
US (1) | US20030000661A1 (sv) |
JP (1) | JP2003020582A (sv) |
CA (1) | CA2390742C (sv) |
FI (1) | FI20021152A (sv) |
SE (1) | SE528163C2 (sv) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006053948A1 (en) * | 2004-11-19 | 2006-05-26 | Metso Paper, Inc. | A method and apparatus for processing wood chips |
US20070151691A1 (en) * | 2003-05-12 | 2007-07-05 | Andritz Inc. | Method for converting a digester for use as a gas phase and hydraulic phase continuous digester |
US20070228108A1 (en) * | 2004-02-03 | 2007-10-04 | Siemens Aktiengesellschaft | Repair Soldering Method for Repairing a Component Which Comprises a Base Material with an Oriented Microstructure |
US20150165488A1 (en) * | 2013-12-18 | 2015-06-18 | Shell Oil Company | Continuous or semi-continuous biomass wash system for hydrothermal hydrocatalytic conversion |
US20150376834A1 (en) * | 2013-02-07 | 2015-12-31 | University Of Maine System Board Of Trustees | Extraction of lignocellulosics for production of fibers and a precipitate-free hemicellulose extract |
WO2019059835A1 (en) * | 2017-09-19 | 2019-03-28 | Domsjö Fabriker Ab | REMOVAL OF INORGANIC ELEMENTS ON WOOD CHIPS |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4050981A (en) * | 1974-06-14 | 1977-09-27 | Mo Och Domsjo Aktiebolag | Process for the delignification of lignocellulosic material by maintaining a concentration of carbon monoxide in the presence of oxygen and alkali |
US4599138A (en) * | 1977-05-02 | 1986-07-08 | Mooch Domsjo Aktiebolag | Process for pretreating particulate lignocellulosic material to remove heavy metals |
US4826567A (en) * | 1985-08-05 | 1989-05-02 | Interox (Societe Anonyme) | Process for the delignification of cellulosic substances by pretreating with a complexing agent followed by hydrogen peroxide |
US5022962A (en) * | 1988-10-25 | 1991-06-11 | Enso-Gutzeit Oy | Method for the treatment of spent liquors in pulp production |
US6143134A (en) * | 1998-11-06 | 2000-11-07 | Andritz-Ahlstrom Inc. | Chip spreader for air-lock feeder |
-
2002
- 2002-06-03 US US10/159,292 patent/US20030000661A1/en not_active Abandoned
- 2002-06-14 FI FI20021152A patent/FI20021152A/sv not_active Application Discontinuation
- 2002-06-14 JP JP2002174678A patent/JP2003020582A/ja active Pending
- 2002-06-17 CA CA002390742A patent/CA2390742C/en not_active Expired - Fee Related
- 2002-06-20 SE SE0201891A patent/SE528163C2/sv not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4050981A (en) * | 1974-06-14 | 1977-09-27 | Mo Och Domsjo Aktiebolag | Process for the delignification of lignocellulosic material by maintaining a concentration of carbon monoxide in the presence of oxygen and alkali |
US4599138A (en) * | 1977-05-02 | 1986-07-08 | Mooch Domsjo Aktiebolag | Process for pretreating particulate lignocellulosic material to remove heavy metals |
US4826567A (en) * | 1985-08-05 | 1989-05-02 | Interox (Societe Anonyme) | Process for the delignification of cellulosic substances by pretreating with a complexing agent followed by hydrogen peroxide |
US5022962A (en) * | 1988-10-25 | 1991-06-11 | Enso-Gutzeit Oy | Method for the treatment of spent liquors in pulp production |
US6143134A (en) * | 1998-11-06 | 2000-11-07 | Andritz-Ahlstrom Inc. | Chip spreader for air-lock feeder |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070151691A1 (en) * | 2003-05-12 | 2007-07-05 | Andritz Inc. | Method for converting a digester for use as a gas phase and hydraulic phase continuous digester |
US7309401B2 (en) | 2003-05-12 | 2007-12-18 | Andritz Inc. | Top separator for gas phase and hydraulic phase continuous digesters and method for converting digester |
US7658818B2 (en) | 2003-05-12 | 2010-02-09 | Andritz Inc. | Method for converting a digester for use as a gas phase and hydraulic phase continuous digester |
US20070228108A1 (en) * | 2004-02-03 | 2007-10-04 | Siemens Aktiengesellschaft | Repair Soldering Method for Repairing a Component Which Comprises a Base Material with an Oriented Microstructure |
WO2006053948A1 (en) * | 2004-11-19 | 2006-05-26 | Metso Paper, Inc. | A method and apparatus for processing wood chips |
US20090084511A1 (en) * | 2004-11-19 | 2009-04-02 | Rami Lampinen | Method and Apparatus for Processing Wood Chips |
US7713382B2 (en) | 2004-11-19 | 2010-05-11 | Metso Paper, Inc | Method and apparatus for processing wood chips |
US20150376834A1 (en) * | 2013-02-07 | 2015-12-31 | University Of Maine System Board Of Trustees | Extraction of lignocellulosics for production of fibers and a precipitate-free hemicellulose extract |
US20150165488A1 (en) * | 2013-12-18 | 2015-06-18 | Shell Oil Company | Continuous or semi-continuous biomass wash system for hydrothermal hydrocatalytic conversion |
US9446436B2 (en) * | 2013-12-18 | 2016-09-20 | Shell Oil Company | Continuous or semi-continuous biomass wash system for hydrothermal hydrocatalytic conversion |
WO2019059835A1 (en) * | 2017-09-19 | 2019-03-28 | Domsjö Fabriker Ab | REMOVAL OF INORGANIC ELEMENTS ON WOOD CHIPS |
Also Published As
Publication number | Publication date |
---|---|
FI20021152A0 (sv) | 2002-06-14 |
JP2003020582A (ja) | 2003-01-24 |
CA2390742C (en) | 2009-11-10 |
SE528163C2 (sv) | 2006-09-19 |
CA2390742A1 (en) | 2002-12-22 |
SE0201891L (sv) | 2002-12-23 |
SE0201891D0 (sv) | 2002-06-20 |
FI20021152A (sv) | 2002-12-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ANDRITZ INC., NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HENRICSON, KAJ O.;STROMBERG, BERTIL C.;REEL/FRAME:013104/0517;SIGNING DATES FROM 20020627 TO 20020710 |
|
AS | Assignment |
Owner name: ANDRITZ INC., NEW YORK Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE SECOND ASSIGNOR'S NAME PREVIOUSLY RECORDED ON REEL 013104, FRAME 0517;ASSIGNORS:HENRICSON, KAJ O.;STROMBERG, C. BERTIL;REEL/FRAME:014049/0768;SIGNING DATES FROM 20020627 TO 20030505 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |