| Patent Number |
Title Of Patent |
Date Issued |
| 7217338 |
Process for continuously cooking chemical cellulose pulp |
May 15, 2007 |
| The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregnated at a predetermined impregnation temperature, |
| 7214291 |
Method for the modification of cellulose fibres |
May 8, 2007 |
| The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking and/or delignification of cellulose chips in a |
| 7179437 |
Feeding device and process and feeding system which utilize the feeding device |
February 20, 2007 |
| Feeding device for feeding burned lime to a reaction vessel for causticizing a soda liquor to caustic soda. The feeding device, in its upper part, comprises an inlet for a slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding device. The syste |
| 7156952 |
Method and arrangement for oxygen delignification of cellulose pulp |
January 2, 2007 |
| The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in the subsequent bleaching |
| 7147230 |
Sealing device and sleeve and holding element for such |
December 12, 2006 |
| The sealing device is for drum filters or filter presses to form a seal between the rotary drum end faces and the end faces of the trough in which the rotary drums are situated. A sealing element (3) is disposed in a groove (1) on the rotary drum end face, in which the sealing element |
| 7077931 |
Method and bleaching line with a main conduit for wash liquor |
July 18, 2006 |
| 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 cellulose pulp established in the bleaching line. A single joint main conduit is used for |
| 6946072 |
Method and apparatus for washing a fibre suspension |
September 20, 2005 |
| A method for washing a fibre suspension with washing liquid, in which, in accordance with the invention, the fibre suspension is introduced into an annular treatment channel (24) that has an inlet end (72) and an outlet end (73) and is concentric with an axis of rotation (5) to form an i |
| 6946056 |
Method for regulating the manufacturing of pulp by optically measuring the amount of hexenuronic |
September 20, 2005 |
| Method for enabling the paper pulp production process to be controlled in such a way that the hexenuronic acid content in the pulp can be minimized and the color reversion of the pulp and/or the pulp products thereby minimized. The method is based on measurements of the optical propertie |
| 6887345 |
Process and device for evaporating liquids, for example black liquor from cellulose cooking, whi |
May 3, 2005 |
| The present invention relates to a process and a device for evaporating liquids, for example black liquor from cellulose cooking, which contain solid and dissolved substances which are to be concentrated. The liquid is heated to close to boiling temperature in a heat exchanger (1) of the |
| 6843885 |
Method for controlling the cooking temperature in a continuous vapour phase digester |
January 18, 2005 |
| The method is for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. A high pressure is established in the vapour phase largely by means of steam, without risk of attaining excessively high temperatures in the cooking. A temp |
| 6841036 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second |
January 11, 2005 |
| A system and process for the oxygen delignification of pulp consisting of a lignocellulose-containing material that has a mean concentration of 8-18% pulp consistency. The oxygen delignification takes place in a first stage with a short dwell time of about 3-6 minutes, at a low temperatu |
| 6808596 |
System for the oxygen delignification of pulp consisting of lignocellulose-containing material |
October 26, 2004 |
| The system is for the oxygen delignification, in at least two reaction stages, of pulp that consists of lignocellulose-containing material having a mean concentration of 8%-18% pulp consistency. The oxygen delignification takes place in a first reaction stage that has a substantially |
| 6722130 |
Method of producing process steam from a black liquor |
April 20, 2004 |
| Method of producing a process steam from a first black liquor derived in connection with the production of paper pulp, wherein the first black liquor is treated to give a second black liquor of a higher concentration than the first black liquor as well as a liquid of low concentration, |
| 6699357 |
Process for continuous cooking of pulp |
March 2, 2004 |
| 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 and cooking liquor are introduced at the top of the digester and pulp is discharged from the |
| 6672227 |
Arrangement for cleaning, airflow control and pushing away melt in air ports of incineration boi |
January 6, 2004 |
| The arrangement is for cleaning and controlling airflow and where appropriate pushing away melt in an air channel of recovery boilers within the paper and pulp industry. By inclining the regulating device 10 at an angle to the horizontal plane and at the same time making the piston of |
| 6668600 |
Distribution device for a device for dewatering pulp |
December 30, 2003 |
| A device for washing and dewatering a fiber pulp suspension. The device has two hollow, circular-cylindrical screen members that contain evacuation chambers for conducting away liquid. The screen members rotate towards each other for the purpose of forming a nip. At least one of the scre |
| 6659635 |
Method for introducing a first fluid into a second fluid, preferably introduction of steam into |
December 9, 2003 |
| The apparatus is adapted for the admixing of a first fluid, preferably steam into the flow of a second fluid, preferably cellulose pulp. With the purpose of obtaining a high and good admixing capacity and avoiding the generation of noise, the admixing of the second fluid is effected in t |
| 6631810 |
Sealing arrangement for a pulp dewatering arrangement |
October 14, 2003 |
| The arrangement is for washing and dewatering a fiber pulp suspension. The arrangement comprises two hollow, circular-cylindrical screen members that have evacuation chambers arranged inside the screen members for leading off liquid. The screen members rotate counter to each other to for |
| 6604743 |
Replaceable wearing surface for a sealing arrangement |
August 12, 2003 |
| The replaceable wearing surface is for a sealing arrangement on drum end walls on a press drum that de-waters fiber suspensions radially into the drum through the shell of the drum. The wearing surface of the sealing arrangement has a wear ring and holder members. The wear ring is, on a |
| 6418963 |
Pipe attachment |
July 16, 2002 |
| A pipe attachment comprises a pipe elbow that is tightly attached to a stand pipe so that the diameter of the stand pipe is greater than the diameter of the pipe elbow. |
| 6391152 |
Process for the oxygen delignification of pulp in two stages with higher pressure in the second |
May 21, 2002 |
| A system and a process for the oxygen delignification of pulp consisting of lignocellulose-containing material whose mean concentration is 8-18% pulp consistency, in at least two stages. The invention is characterized in that the oxygen delignification takes place in a first stage with a |
| 6341888 |
Apparatus for introduction of a first fluid into a second fluid |
January 29, 2002 |
| A method and apparatus for introduction of a first fluid into a second fluid, that flows in a conduit. A first member with a pass-through canal for said second fluid, is at least partially encircled by a chamber with a wall between the inner part of the chamber and the pass-through canal |
| 6241852 |
Method and device for mixing of a fluid into a pulp-suspension at the lowest pressure of the sus |
June 5, 2001 |
| Process and device for mixing fluid into a pulp suspension of cellulose-containing fiber material, in which the pulp suspension is pumped in through a pump inlet (17), brought into rotation and, at the desired reaction pressure, mixed with the said fluid while passing through a react |
| 6238468 |
Quench vessel |
May 29, 2001 |
| Provided is a quench vessel having a cooling structure in which a combustion gas is forced down and through a cooling liquid a plurality of times. |
| 6221208 |
Method for heating and pressuring a fibre pulp suspension during transportation to a bleaching r |
April 24, 2001 |
| A method for treating a fiber pulp suspension, which comprises transporting the fiber pulp suspension from a maintenance vessel, in which there is atmospheric pressure or at most 1 bar overpressure and in which the pulp suspension is at a temperature which does not exceed 95.degree. C., |
| 6143130 |
Polysulfide pulping process |
November 7, 2000 |
| A method for impregnation and chemical digestion of lignocellulosic material and recovery of pulping liquors. A spent impregnating or cooking liquor is withdrawn and sulphurous compounds are recovered therefrom in a partial oxidation reactor. These sulphurous compounds are converted into |
| 6139685 |
Method and device for treating a pulp suspension |
October 31, 2000 |
| The present invention relates to a method for treating a pulp suspension in which the suspension is rotated in a rotationally symmetrical, rapidly rotating and permeable screen basket so that the suspension is subjected to the influence of a centrifugal force and dewatered at the same ti |
| 6113742 |
Digester having screening arrangement for isothermal cooking of fibrous material |
September 5, 2000 |
| The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried ou |
| 6113739 |
Process for washing gas formed by gasifying black liquor |
September 5, 2000 |
| Process for recovering chemicals and energy from black liquor, where the black liquor is gasified with CO, CO.sub.2, CH.sub.4, H.sub.2, and H.sub.2 S, in gaseous form, and Na.sub.2 CO.sub.3, NaOH and Na.sub.2 S, in the form of drops of smelt, being principally formed. The mixture of gas |
| 6071378 |
Method and device for treating a pulp suspension |
June 6, 2000 |
| The present invention relates to a method for treating a pulp suspension in which the suspension is rotated in a rotationally symmetrical, rapidly rotating and permeable screen basket so that the suspension is subjected to the influence of a centrifugal force and dewatered at the same ti |
| 6063238 |
Black liquor impregnation in digester |
May 16, 2000 |
| The present invention relates to a digester and a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1), white liquor (4) being added at at least one |
| 6062547 |
Quench vessel for recovering chemicals and energy from spent liquors |
May 16, 2000 |
| Provided is a quench vessel containing at least two separate internal vessels. A receiving liquor is contained in the first internal vessel and a washing liquid bath is contained in a second internal vessel. |
| 6054019 |
Impregnation of fiber material in two subsequent concurrent impregnation zones |
April 25, 2000 |
| A method for cooking chips which are impregnated, in a vessel (3), with liquid in first and second concurrent impregnation zones (A, B), impregnation liquid being supplied, in a mixture with steamed chips, through a feeding system to the first impregnation zone, and liquid for recove |
| 6030493 |
Process for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers |
February 29, 2000 |
| Provided is a process for recovering chemicals and energy from spent liquor obtained when producing paper pulp by chemical delignificatation of fibrous raw material. The spent liquor is gasified in at least two reactors, a first and a second stream of solid and/or smelt material and |
| 6030113 |
Mixing apparatus and method for mixing black liquor from cellulose production with ash from flue |
February 29, 2000 |
| A mixing apparatus for mixing black liquor from cellulose production with ash from flue gases which is generated on combustion of black liquor. The mixing apparatus contains a cylindrical tank, a stirrer mechanism having a propeller secured on the upper part of a vertical shaft, rotating |
| 6024833 |
Process for removing metals and recovering a chelating agent from a bleach plant waste liquor |
February 15, 2000 |
| 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 metals bound in a chelating agent to a temperature of at least about 140.degree. C. to break |
| 6007680 |
Apparatus for safely conducting pressurized peroxide bleaching |
December 28, 1999 |
| Apparatus for safely carrying out pressurized peroxide bleaching of pulp in a bleaching vessel at a consistency exceeding 8%, the bleaching vessel designed for at least 0.5 MPa overpressure, with the pulp being pumped to the bleaching vessel through a mixer at a temperature exceeding 90. |
| 5993601 |
Process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft ce |
November 30, 1999 |
| The invention relates to a process for producing polysulphide by means of oxidizing sulphide in spent liquors from kraft cellulose cooking. The process is characterized in that green liquor is firstly enriched in sulphide and then oxidized. |
| 5989394 |
Process for treatment of a contaminated liquid |
November 23, 1999 |
| A process for purification treatment of an impure liquid, such as a contaminated condensate, obtained when producing paper or paper pulp. The liquid is introduced intro a stripper device at an admission point (C) and the stripper device is also supplied with an acidifier preferably at a |
| 5983930 |
Air supply valve |
November 16, 1999 |
| The invention relates to a throttle device for delivery of a current of gas through a channel (1), the device comprising a flap (4) which is arranged so that it can pivot on an axle (5) and which is designed in such a way that, at a certain pressure force exerted by the current of gas, i |
| 5976321 |
Process for making sulfur enhanced undigested cellulosic fiber material and pulp |
November 2, 1999 |
| Provided is a process for making pulp having the steps of:contacting an undigested cellulosic fiber material with a pretreatment liquid formulated from a mixture comprising alkali metal bicarbonate and alkali metal hydrogen sulfide as reaction components which are dissolved or disbursed |
| 5954066 |
Method for controlling chemical reaction |
September 21, 1999 |
| Method for safely carrying out chemical reactions in a vessel having a discharge end, wherein a control valve is provided at the discharge end, and wherein reacted and unreacted chemicals are cleared from in front of the control valve thus reducing the risk of reacted and unreacted c |
| 5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stag |
July 20, 1999 |
| 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 zone of the digester in an amount such that the black liquor makes up greater than 40% by volume o |
| 5904753 |
Separation device and process |
May 18, 1999 |
| The present invention relates to a process and a device for the separation and purification of gas from a fiber suspension, especially residual gas after ozone delignification or pulp suspension, wherein the suspension together with the gas is introduced into a cyclone (2) or similar in |
| 5901585 |
Drum supported by support rollers for washing fibre material |
May 11, 1999 |
| Apparatus for treating pulp, comprising a stand (1); a rotatably mounted drum (3); feeding and discharging members (6, 8) for the pulp; a wall member (2) which surrounds the jacket (40) of the drum in order to delimit therebetween a material space (5) with which the feeding member co |
| 5868805 |
Process for integrated evaporation and gasification of spent liquor from cellulose cooking |
February 9, 1999 |
| The invention relates to a process for integrated evaporation and gasification of spent liquor from the production of cellulose, the gasification taking place in a reactor (1) at a pressure of from atmospheric pressure up to about 150 bar and at a temperature of about 500.degree.-160 |
| 5836181 |
Diffuser |
November 17, 1998 |
| The invention relates to a diffuser having a substantially cylindrical container through which cellulose pulp is arranged to be transported, nozzle arms for delivering a fluid to the pulp, a scraper arm with scrapers spaced apart from the nozzle arms, and concentrically disposed scre |
| 5814189 |
Method for gasifying cellulose spent liquor to produce superheated steam and green liquor of low |
September 29, 1998 |
| Provided is a novel process for the preparation of an aqueous solution of alkaline compounds from a generator gas, containing carbon monoxide, carbon dioxide, hydrogen and entrained alkaline compounds, which gas has been formed during partial combustion of cellulose spent liquors in a ga |
| 5778704 |
Arrangement for a continuous diffuser for washing pulp |
July 14, 1998 |
| Arrangement for a continuous diffuser for washing pulp, comprising a number of hydraulic cylinders distributed in a ring, arranged so as to repeatedly raise and then lower a screen assembly which is included in the diffuser. The characterizing feature of the invention is that groups of t |
| 5766413 |
Process for isothermal cooking pulp in a continuous digester |
June 16, 1998 |
| The present invention relates to a digester for continuous cooking under raised pressure and temperature of fibre material in a vertical digester (1), where input of fibre material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried ou |
