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7686919 |
Method and device for the continuous cooking of pulp
The continuous digester system has an inlet defined therein for the feed of a chips suspension and an outlet for the output of a cooked suspension of pulp. The suspension or chips is fed in to the...
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7553394 |
Method for removing potassium from ash produced in a kraft pulping process recovery boiler using a Na-type cation exchange organic resin
In the process for producing kraft pulp, performing a potassium ion removal step of flowing an aqueous solution containing ashes recovered from a combustion exhaust gas generated in a black...
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7402224 |
Method for producing paper pulp, lignins, sugars and acetic acid by frantionation of lignocellulosic vegetable material in formic/acetic acid medium
A method for producing paper pulp from a lignocellulosie vegetable raw material. The method includes contacting the raw material with a mixture of formic acid and acetic acid (in an amount more...
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7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate
The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of...
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7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digester
The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd,...
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7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor
The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done...
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7182835 |
Two-stage chlorine bleaching process with filtrate recirculation
Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline...
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7112256 |
Method for continuous cooking of chemical pulp to improve heat economy
A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel (1) for impregnation and a vessel (2) for cooking the...
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7097738 |
Process for producing pulp
The invention relates to a process for producing pulp from a fibre-based raw material using, as the cooking reagent, a solvent mixture which is based on organic acids and also contains furfural....
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6946057 |
Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali
The present invention relates to a new and environmentally sound process for the manufacturing of a chemical pulp from lignocellulosic material with an integrated recovery system for recovery of...
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6942754 |
Process for producing xylooligosaccharide from lignocellulose pulp
Xylooligosaccharide is produced from a lignocellulose pulp by enzyme-treating a lignocellulose pulp with hemicellulase, filtering the resultant reaction mixture to separate a liquid fraction from...
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6699357 |
Process for continuous cooking of pulp
The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp. Fiber material...
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6663749 |
Method for regenerating sodium hydroxide by partial autocausticizing sodium carbonate containing smelt by reaction with borate
A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and...
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6641699 |
Chemical wood pulping process with reduced pitch and VOC emissions
A chemical wood pulping process having reduced volatile organic compound emissions includes extracting wood particulates with solvent at a pressure less than 50 psi to reduce naturally-occurring...
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6569284 |
Elemental-chlorine-free bleaching process having an initial Eo or Eop stage
The specification discloses an improved bleaching sequence which provides significant reduction in filtrate volumes and amounts of absorbable organic halide (AOX), color, and chemical oxygen demand...
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6544384 |
Pretreatment of chips before cooking
The strength properties of chemical cellulose pulp (particularly kraft pulp) are improved by substituting a cold impregnation soak for conventional impregnation procedures. After steaming, wood...
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6468390 |
Method for continuous cooking of lignocellulosic fiber material
A method for continuous cooking of lignocellulosic fiber material, comprising the steps of sequentially (a) in a first stage, impregnating the fiber material in an impregnation liquid comprising...
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6350348 |
Batch cooking with black liquor pretreatment
A method of cooking pulp in an alkaline batch process (using one or more batch digesters) improves pulp bleachability. The wood material is supplied to the digester; the cellulosic material is...
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6348128 |
Method of increasing the causticizing efficiency of alkaline pulping liquor by borate addition
A method is provided for improving causticizing efficiency in the conventional lime recausticization portion of an alkaline pulping process. Such processes are commonly used in the pulping and...
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6277240 |
Method for continuously pulping cellulosic fibrous material
In the production of chemical pulp, such as kraft pulp, it is possible to reduce the amount of ancillary equipment, and/or the size of the continuous digester vessel, while achieving enhanced...
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6203662 |
Method for the continuous cooking of pulp in a digester system having a top separator
This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different...
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6183597 |
Method of producing a pulp from cellulosic material using formic acid and hydrogen peroxide
A process for producing a pulp from cellulose-containing material, wherein the material is reacted with formic acid as the solvent, and cooked at approximately the boiling temperature of the...
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6153300 |
Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals
Recycled paper pulp having at least two different types of paper which consume widely different amounts of bleaching chemical, or mixed hardwood and soft-wood pulps, are treated in a manner that...
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6106667 |
Treatment of recycled bleach plant filtrates
Filtrates from bleach plants for cellulosic (paper) pulp non-chlorine bleaching sequences are treated to minimize the consumption of ozone in ozone bleaching stages. Organic material in the...
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6039837 |
Method of bleaching pulp with ozone wherein the acidity is maintained with an acid solution prepared by electrolysis or electrodialysis
When closing the process of manufacturing cellulose pulp of high brightness, i.e. including the recovery of essentially all waste liquor, there is an untenable enrichment of certain basic elements,...
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6024833 |
Process for removing metals and recovering a chelating agent from a bleach plant waste liquor
Provided is a process for removing metals from a bleaching plant spent liquor and recovering a chelating agent which includes the steps of: heating a spent liquor containing a chelate comprising...
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5944951 |
Method for reusing spent gas from an ozone bleaching reactor
A method for reusing spent gas from an ozone bleaching reactor includes steps for removing lint from the spent gas, compressing it, passing it through a reactor in which hydrocarbons and carbon...
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5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stage
The present invention provides a method for continuously cooking kraft pulp in a digester having the steps of: feeding chips into an inlet of a digester; supplying black liquor to an impregnation...
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5788813 |
Clarifying and/or filtering of green liquor and an apparatus therefore
A method and apparatus for treating green liquor from a sulphate pulp mill enhances the clarification of the green liquor and may easily be integrated into existing pulp mills. A first portion of...
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5788812 |
Method of recovering furfural from organic pulping liquor
This invention provides for the recovery of lignin and other by-products from the pulping of fibrous plant material. In accordance with this invention, solvents and filtrates are recovered and...
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5741398 |
Method of removing metal ions dissolved in the bleach plant waste water
Methods of treating process water containing metal ions is disclosed including contacting the process water with a pulp comprising lignocellulose-containing material at a pH of above about 7 and a...
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5736006 |
Method and apparatus for pulping with controlled heating to improve delignification and pulp strength
Low temperature steaming and slurrying of wood chips results in significant improvement in treatment, the chips being maintained at a temperature below 110° C. (more desirably at about 105° C. or l...
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5676795 |
Process for the production of viscose pulp
The present invention relates to a process for producing viscose pulp from lignocelluloses, such as hardwood, softwood or annual plants, in which process the lignocellulose is treated in a digester...
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5645728 |
Hydrogen peroxide recovery from colored aqueous solutions
A method of recovering hydrogen peroxide from colored aqueous solutions is disclosed. The solution is brought in contact with a non-ionic size-exclusion chromatography resin made up of packed...
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5643410 |
Batch process for preparing kraft pulp in a batch digesting process
Methods for discharging spent cooking liquors from a batch digester containing cooked lignocellulose-containing material in spent cooking liquor are disclosed, including supplying a first portion...
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5639347 |
Method of controlling of metals in a bleach plant, using oxidation
A method and apparatus facilitate removal of metals from acidic liquids containing dissolved metals (such as pulp mill bleach plant washer filtrate) by oxidizing the liquid with ozone, hydrogen...
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5593544 |
Pulp production
A method of manufacturing chemical pulp out of comminuted cellulosic fiber material comprising digesting the fiber material with digestion liquid without preceding peroxide stage. According to the...
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5589033 |
Production of prehydrolyzed pulp
Processes for preparing pulp from lignin-containing cellulosic material are disclosed including a prehydrolysis step followed by neutralizing hydrolysate and the prehydrolyzed cellulosic material...
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5509999 |
Treatment of bleach plant effluents
The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or...
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5401362 |
Control of metals and dissolved organics in the bleach plant
Transition metals are removed from cellulose pulp and treatment fluids in a pulp mill. Medium consistency digested pulp is treated in an acidic stage, and then washed to produce a filtrate. The pH...
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5360514 |
Treatment of bleach plant filtrations using a magnesium filter
In the bleaching of paper pulp without chlorine, such as using an OTZE or OZP bleach sequence, filtrate from subsequent stages is used as a wash liquid in preceding wash stages. The filtrate is...
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5346591 |
Apparatus for treatment of chips with heated black liquor
An apparatus provide for the production of low kappa number (e.g. below 20) kraft paper pulp, and a low viscosity black liquor which is easily transported to a recovery or disposal stage....
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5256255 |
Displacement heating in continuous digesters
An apparatus and method for treating cellulosic wood chips in a digestion process for the liberation of pulp in a caustic hydroxide solution at high pressures and temperatures by delivering...
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5213662 |
Treatment of chips with high temperature black liquor to reduce black liquor viscosity
A method and apparatus provide for the production of low kappa number (e.g. below 20) kraft paper pulp, and a low viscosity black liquor which is easily transported to a recovery or disposal stage....
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5183535 |
Process for preparing kraft pulp using black liquor pretreatment reaction
Processes for prepariing kraft pulp are disclosed. The processes include pretreating cellulosic material or chips with spent cooking liquor at the temperature of about 20° to 100° C., followed by h...
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5080757 |
Method to displace a digester from both ends
An apparatus and method for use in a batch digesting process to quantitatively displace fluids in the digester by pumping into the digester under pressure a first volume of displacing fluid at the...
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5069752 |
Digester screen switching
In a continuous digester for paper pulp (comminuted cellulosic material), abrupt variations in high pressure steam flow are minimized. First and second vertically spaced annular screens are...
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5061343 |
Recovery of NaOH and other values from spent liquors and bleach plant effluents
Oxidized weak black liquor or effluents from alkaline bleaching stages, particularly oxygen delignification and/or ozone and/or hydrogen peroxide bleaching effluents are treated in process stages...
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5053108 |
High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips
A method and apparatus provide for the continuous digestion of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, with increased sulfidity. When black liquor is...
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5022962 |
Method for the treatment of spent liquors in pulp production
The invention concerns a method for the treatment of the spent liquors obtained from pulp production processes in the wood-processing industry, in which method the waste obtained from a chemical...
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