US3900615A - Process for treating wood - Google Patents

Process for treating wood Download PDF

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Publication number
US3900615A
US3900615A US297464A US29746472A US3900615A US 3900615 A US3900615 A US 3900615A US 297464 A US297464 A US 297464A US 29746472 A US29746472 A US 29746472A US 3900615 A US3900615 A US 3900615A
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US
United States
Prior art keywords
wood
solvent
treating
solution
pressure
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
Application number
US297464A
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English (en)
Inventor
Jr James L Dunn
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.)
Dow Chemical Co
Original Assignee
Dow Chemical Co
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 Dow Chemical Co filed Critical Dow Chemical Co
Priority to US297464A priority Critical patent/US3900615A/en
Priority to CA164,345A priority patent/CA998890A/en
Priority to ZA735226A priority patent/ZA735226B/xx
Priority to NL7312199A priority patent/NL7312199A/xx
Priority to DE19732345620 priority patent/DE2345620A1/de
Priority to JP48112943A priority patent/JPS4971104A/ja
Priority to IT53056/73A priority patent/IT996297B/it
Priority to FR7336417A priority patent/FR2202762B1/fr
Priority to BE136639A priority patent/BE806021A/xx
Priority to GB4789273A priority patent/GB1444102A/en
Application granted granted Critical
Publication of US3900615A publication Critical patent/US3900615A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/38—Aromatic compounds
    • B27K3/40—Aromatic compounds halogenated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0207—Pretreatment of wood before impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/36—Aliphatic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/001—Heating

Definitions

  • the process is preferably run in essentially continuous manner by operating three or more inter- 1561 References C'ted connected treating chambers simultaneously in offset UNITED STATES PATENTS cycle sequence using a common source of boiling 2,860,070 11/1958 McDonald 117/147 treating Solution under moderate superatmospheric 2,931,737 4/1960 Thornton 117/147 pressure. 3,200,003 8/1965 Bescher 117/59 1 3,685,959 11 1972 Dunn 21 7 5 Clams l Drawmg F'gure I f WO/E/Ou/ -g s Wmer in 2 "5102. 1'
  • the present process is a modification of the latter procedure whereby rapid and essentially continuous treatment of wood is accomplished with highly efficient use of both energy and treating materials. lt is applicable to both the more permeable woods such as southern yellow pine and ponderosa pine and the denser hard woods.
  • FIG. 1 is a diagrammatic representation of a preferred wood treating apparatus of the invention having three treating chambers in the form of horizontally disposed cylindrical presure vessels, each having one closed end and an open endfitted with a door for loading and unloading wood, the doorsbeing capable of being closed and sealed to withstand moderate superatmosphericpressures.
  • the three cylinders have a common source 'of hot treating solution (the reboiler), a common solution make-up tank, common condensing means for solvent vapor at about atmospheric pressure and another such means for condensing solvent vapor at superatmospheric pressure, and appropriate circulating pumps for treating solution, allof the above with suitable interconnecting lines and valves,gtemperature and pressure regulators, ventsand drains as required.
  • Three pressure cylinders '10, I1 and 12 are provided, each with a door or end, not shown, through which the wood to be treated can be loaded or unloaded into the cylinder, and which door will seal the-cylinder in a manner to prevent escape of liquid or vapors from the cylinder under superatmospheric pressure.
  • Each cylinder l0, l1 and 12 is provided-with a surge drum l3, l4 and 15, respectively.
  • a high pressure-water cooled condenser 16 is connected through piping 24 to each surge drum 13, 14 and 15.
  • a temperature responsive control valve 16A maintains the pressure within the condenser 16 through tempera-v ture sensing element 168.
  • the condensate from condenser 16 passes to pump 16D through line 16C to reboiler 17.
  • Reboiler 17 is connected through piping 21 to the three cylinders 10, 11 and 12.
  • Each cylinder 10, 11 and 12 is connected to a low pressure condenser 18, having a temperature responsive control 18A associated with temperature sensing element 18B.
  • the condensate from the low pressure condenser 18 is directed to fresh solvent and penta mix storage tank 19. Penta make-up and fresh solvent make-up are introduced into tank 19 through lines 19A and 193, respectively.
  • Pump 20 withdraws solvent from tank 19 on demand and delivers it to reboiler 17.
  • Various other piping is provided in an interconnecting manner to transfer fluids from one cylinder to another. Valves are provided to control the flow of fluids. These valves are piping are fully identified and their operative cycles are set
  • the present invention is illustrated hereafter with regard to treating yellow pine dimension lumber. Other woods require different treating cycles. However, it can generally be determined that the average treating cylinder, for example, requires about 30 minutes to load and 3 an equal period to unload; that a normal cylinder takes about 75 minutes to purge of air and heat the lumber to the treating temperature; that the equipment (pumps, piping, etc.) limits the rate of filling the cylinders with TABLE I Step I, Time Units 1-2 Cylinder 2 Cylinder 3 Cylinder l liquid and the build-up of pressure such that filling rewmd fi i' has and cylinder door is pressurized boiling drained from soaked qulres about mml 1te5' It known'that y q p closed solution admitted wood into Cylinder 3 lumber bundles require about 105 minutes to impregfrom Cylmdcr 3 prcssurqls reduced I to atmosphenc through natethe bundle.
  • Draining, solvent recovery and letlow pressure condenser down to atmosphere are about equal in total time reto flash ofl'solvent in the quirement to filling, soaking and purging.
  • An equation to enable the operator to adjust his cycles to a multiple Step 2 Time Units 3-7 li d Operation ld t k th f f; Purge air from Wood remains Solvent is flashed off as cylinder with hot soaking above v solvent vapor from 2L P 2FD .S R/no.
  • Time Units 27-28 ing Reduce to Heat wood with Wood soaking then atmospheric vapor from 3, admit drain solution to 2
  • An offset cycle sequence is described in detail in Tapressure admit hm 80min f 3 bles l and ll for the three cylinder apparatus of the U d )d svtspojfTingc Units 29-30l d d 7 drawing.
  • the individual operating steps are allotted 5 0 certain numbers of time units as an indication of the ap- 40 roximate relative len ths of the ste s.
  • Table II lists the valving sequence during the treating depending upon the dimensions of the wood pieces and n v procedure of Table I. For each valve, an O marked the kind of wood particularly. For a representative under a particular time unit indicates that the valve is wood treating procedure, each time unit might be 15 minutes for example open. A valve not so marked is closed.
  • chlorinated aliphatic solventsjwh-ieh can n t p.
  • typical operating pressur s in l/ q: n. 30 beused are propylene dichlorideand compounds-as deg ug in yl n r i the oiler, and in the high scribed above where some of-the chlorineatomshave pressure condenser are about as followsin the various been'replaced by fluorine- ⁇ for example, l, 2 d ichloro"- steps.
  • Methylene chloride is particularly-pre- 3 30-64 ferredi 1 4 t 30 f: 1 64 62 6 2 Pentachlorophenol or a mixture of pentachlorophe- 6 5041 64 64 nol with a minor proportion of tetrachlorophenol is the Z, 23 2 28 3 preferred wood preservative used in the process.
  • the treating solution contains about 2-10 percent by weight of pentachlorophenol.
  • Other wood preserving chernicals can be used, either alone or in com-
  • the preliminary heating step wherein the wood is bination with pentachlorophenol in the treating solucontacted with hot pressurized solvent vapor is preferation.
  • the treating solution may contain bly carried out at about 100C.
  • This step re- '50 other such additives to modify the properties of the quires from about 0.5 hour to about 4 hours depending treated wood.
  • the The process is most advantageously used for impregdimensions of the pieces, and the amount of moisture nating seasoned wood with preservatives, fire retardant in the wood. chemicals, dyes, or other wood treating compositions
  • the same preferred temperature range applies to the or mixtures thereof.
  • it can also be applied to soaking step in which the hot wood is immersed in sugreen or partially seasoned wood in which case it beperheated treating solution.
  • the individual cycles are staggered and coordinated such that the treating solution filling time for one chamber coincides with the solution removal time of another.
  • the treating chamber was a horizontally disposed steel cylinder about 12 feet long and 2 feet in diameter with one end permanently closed and a sealable door at the other end. It contained a steam coil along the bottom, a tram for moving lumber into and out of the cylinder, and it was equipped with appropriate piping connections for admission and removal of liquid and vapor, including connections to a water-cooled condenser and liquid storage. The whole system was adapted to operation under moderate superatmospheric pressure.
  • a process for treating wood which consists essentially of the steps:

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
US297464A 1972-10-13 1972-10-13 Process for treating wood Expired - Lifetime US3900615A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US297464A US3900615A (en) 1972-10-13 1972-10-13 Process for treating wood
CA164,345A CA998890A (en) 1972-10-13 1973-02-22 Process for treating wood
ZA735226A ZA735226B (en) 1972-10-13 1973-07-31 Process for treating wood
NL7312199A NL7312199A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-10-13 1973-09-04
DE19732345620 DE2345620A1 (de) 1972-10-13 1973-09-10 Verfahren zur behandlung von holz
JP48112943A JPS4971104A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-10-13 1973-10-09
IT53056/73A IT996297B (it) 1972-10-13 1973-10-11 Procedimento ed apparecchiatura per trattare legno con additivi modificanti
FR7336417A FR2202762B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-10-13 1973-10-12
BE136639A BE806021A (fr) 1972-10-13 1973-10-12 Procede de traitement du bois
GB4789273A GB1444102A (en) 1972-10-13 1973-10-12 Process for treating wood

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US297464A US3900615A (en) 1972-10-13 1972-10-13 Process for treating wood

Publications (1)

Publication Number Publication Date
US3900615A true US3900615A (en) 1975-08-19

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Application Number Title Priority Date Filing Date
US297464A Expired - Lifetime US3900615A (en) 1972-10-13 1972-10-13 Process for treating wood

Country Status (10)

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US (1) US3900615A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4971104A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE806021A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA998890A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2345620A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2202762B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1444102A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT996297B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7312199A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA735226B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979960A (en) * 1989-04-14 1990-12-25 Rexius Forest By-Products, Inc. Apparatus for and method of coloring wood by-products
US5485685A (en) * 1992-04-10 1996-01-23 Eiwa Co., Ltd. Wood treating method
US5942008A (en) * 1997-06-11 1999-08-24 Curto; Calogero Method of dyeing wood veneer at elevated temperatures and pressures
US20090061207A1 (en) * 2004-09-30 2009-03-05 The State Of Queensland Acting Through The Dept. Of Primary Industries And Fisheries Impregnation apparatus and method
CN1491301B (zh) * 2001-02-01 2010-06-30 费拉迪米尔·克里亚泽金 复合材料及其生产方法
WO2011058240A1 (fr) * 2009-11-13 2011-05-19 Alex Degaie Procédé pour le traitement de troncs d'arbres coupés, par imprégnation des fibres par une solution de traitement et installation pour le traitement de troncs d'arbres coupés
US8096064B2 (en) * 2007-01-26 2012-01-17 Forestry And Forest Products Research Institute Method for drying lumber, method of impregnating lumber with chemicals, and drying apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO781826L (no) * 1977-05-31 1978-12-01 Forest Prod Util Lab Fremgangsmaate til trykkimpregnering av tre
DK142183A (da) * 1983-03-29 1984-09-30 Steen Moldrup Fremgangsmaade og middel til impraegnering af trae

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860070A (en) * 1954-06-04 1958-11-11 Barber Greene Co Method of drying and impregnating wood
US2931737A (en) * 1957-07-30 1960-04-05 Hickson S Timber Impregnation Impregnation process
US3200003A (en) * 1962-01-11 1965-08-10 Koppers Co Inc Process for impregnating wood with pentachlorophenol and composition therefor
US3685959A (en) * 1969-04-24 1972-08-22 Dow Chemical Co Wood seasoning and modification

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860070A (en) * 1954-06-04 1958-11-11 Barber Greene Co Method of drying and impregnating wood
US2931737A (en) * 1957-07-30 1960-04-05 Hickson S Timber Impregnation Impregnation process
US3200003A (en) * 1962-01-11 1965-08-10 Koppers Co Inc Process for impregnating wood with pentachlorophenol and composition therefor
US3685959A (en) * 1969-04-24 1972-08-22 Dow Chemical Co Wood seasoning and modification

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979960A (en) * 1989-04-14 1990-12-25 Rexius Forest By-Products, Inc. Apparatus for and method of coloring wood by-products
US5485685A (en) * 1992-04-10 1996-01-23 Eiwa Co., Ltd. Wood treating method
US5942008A (en) * 1997-06-11 1999-08-24 Curto; Calogero Method of dyeing wood veneer at elevated temperatures and pressures
CN1491301B (zh) * 2001-02-01 2010-06-30 费拉迪米尔·克里亚泽金 复合材料及其生产方法
US20090061207A1 (en) * 2004-09-30 2009-03-05 The State Of Queensland Acting Through The Dept. Of Primary Industries And Fisheries Impregnation apparatus and method
US8096064B2 (en) * 2007-01-26 2012-01-17 Forestry And Forest Products Research Institute Method for drying lumber, method of impregnating lumber with chemicals, and drying apparatus
WO2011058240A1 (fr) * 2009-11-13 2011-05-19 Alex Degaie Procédé pour le traitement de troncs d'arbres coupés, par imprégnation des fibres par une solution de traitement et installation pour le traitement de troncs d'arbres coupés
FR2952574A1 (fr) * 2009-11-13 2011-05-20 Alex Degaie Procede pour le traitement de troncs d'arbres coupes, par impregnation des fibres d'une solution de traitement et installation pour le traimtement de troncs d'arbres coupes

Also Published As

Publication number Publication date
ZA735226B (en) 1974-07-31
DE2345620A1 (de) 1974-04-18
BE806021A (fr) 1974-04-12
CA998890A (en) 1976-10-26
NL7312199A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-04-16
IT996297B (it) 1975-12-10
FR2202762A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-05-10
GB1444102A (en) 1976-07-28
FR2202762B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-04-30
JPS4971104A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-07-10

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