Matches 101 - 150 out of 389 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
5882477 Continuous digester with a low temperature gas-phase  
A cellulose pulp continuous digester (e.g. for producing kraft pulp) is operated so that it has the advantages of a hydraulic digester yet has a gas-filled zone over the liquid level. A slurry of...
5876561 Post digestion treatment of cellulosic pulp to minimize formation of dioxin  
A post-digestion treatment method for cellulosic pulps which reduces the generation of dioxins and other chlorinated organics in the pulp, treatment effluent and/or the paper product produced from...
RE36033 Process for the comminution of materials and plants for carrying out the process  
A process for the comminution, in particular defibrillation, and reaction of fibrous materials having a high dry solids content with the addition of a circulating medium, preferably a carrier gas...
5853535 Process for manufacturing bleached pulp including recycling  
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide...
5853536 Method for ozone bleaching of cellulosic pulp at low consistency  
A method of bleaching a pulp at low consistency employs chlorine dioxide and/or chlorine, to partially bleach the pulp. The aqueous partially bleached pulp flows along a sinuous flow path providing...
5792316 Bleaching process for kraft pulp employing high consistency chlorinated pulp treated with gaseous chlorine and ozone  
In the bleaching of kraft cellulosic pulps employing a stage in which the pulp is contacted simultaneously with gaseous chlorine and ozone, the improvement in which the pulp at a low to high...
5785812 Process for treating oxygen delignified pulp using an organic peracid or salt, complexing agent and peroxide bleach sequence  
A process for delignifying and bleaching lignocellulose-containing pulp, in which the pulp is delignified with a peracid or a salt thereof, treated with a complexing agent, and subsequently...
5785811 Process for treating lignocellulosic material with soybean peroxidase in the presence of peroxide  
Wood pulps are bleached and/or delignified using soybean peroxidase. A protease, xylanase, ligninase, pectin esterase, pectin lyase or manganese peroxidase may also be used simultaneously or as a...
5785810 Wood pulp processing apparatus and method  
A system for dewatering/washing wood pulp and also for bleaching the same. Pulp from a digester is directed into a dewatering/washing apparatus which comprises a high pressure vessel in which there...
5783037 System and method for operating a pulp mill  
A pulp mill includes a digester which contains a raw material, a digesting medium, and a source of steam. Oxygen is injected into the steam line, at a point which minimizes exposure of the oxygen...
5772844 Process distributing fluffed pulp into a static bed reactor for gaseous treatment  
A process and apparatus for treating and particularly bleaching pulp contacts a pulp with a gaseous reaction medium in a reactor tower. The pulp is fluffed and refined before being added to the...
5770011 Neutral monoperoxysulfate bleaching process  
An elementally chlorine-free method for the delignification and bleaching of pulp which involves the use of a neutral monoperoxysulfate bleaching step to delignify and thus brighten the pulp. The...
5770010 Pulping process employing nascent oxygen  
This invention relates to an environmentally preferred process for the delignification of a cellulosic biomass comprising pulp. The process uses the oxidative properties of nascent oxygen to...
5766414 Method of bleaching cellulose pulp with peroxide under elevated pressure in a first vessel and atmospheric pressure in second vessel  
Bleaching of cellulose pulp with peroxide is accomplished and has the advantages of conventional pressurized peroxide bleaching without the need for a large pressurized vessel. Pulp at a...
5766415 Process for delignification and bleaching of chemical wood pulps with peroxide and dicyandiamide activator  
A process of delignifying and bleaching a chemical wood pulp with hydrogen peroxide and dicyandiamide as an activator provides a higher degree of delignification and brightness of the pulp and...
5755925 Bleaching recycled pulp with ozone and hydrogen peroxide  
A method of bleaching recycled paper containing pulp wherein said pulp is contacted with ozone in an ozone stage (Z) treatment with a brightness stabilizing step during or at the end of said ozone...
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...
5728264 Avoidance of salt scaling by acidic pulp washing process  
The use of hot water extraction (pH 7-8, 165° F.) in place of an alkaline extraction in pulp bleaching sequences between an ozone delignification stage alkaline wash and a brightening stage allows...
5709774 Heat treated high lignin content cellulosic fibers  
Heat-treated-in-air high lignin content cellulosic fibers which are free of moieties from crosslinking agents, for use in absorbent structures, are prepared by fluffing high lignin content fibers...
5698075 Process for bleaching a chemical paper pulp in an oxygen-peroxymonosulfuric acid-hydrogen peroxide sequence  
A process for bleaching a chemical paper pulp, including, in the order recited, subjecting the chemical paper pulp to treatment with oxygen in a preliminary delignification stage which does not...
5695604 Method for reprocessing an ozone-containing gas present in a pulp bleaching plant  
A method for reprocessing an ozone-containing gas present in a pulp bleaching plant comprising the steps of supplying the ozone-containing gas to a scrubber and reducing the ozone concentration of...
5693184 Reduction of salt scale precipitation by control of process stream pH and salt concentration  
A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of insoluble salts during the bleaching of pulp. The pulp is subjected to a bleaching...
5690786 Process for the treatment of pulp with oxygen and steam using ejectors  
A process for using ejectors to combine high pressure steam and low pressure oxygen to produce a steam and oxygen enriched gas single phase gas mixture for introduction into various pulp treatments...
5688367 Method of monitoring and recovering oxygen-rich gas from ozone bleaching  
A method and installation for bleaching a lignocellulosic pulp with ozone, while recovering an oxygen-rich gas which may be recycled or re-used. Bleaching of the pulp with ozone is preferably...
5688368 Method for cooling and ozone bleaching wood pulp  
A method and apparatus for cooling wood pulp, coming from a high temperature bleaching stage at a consistency of approximately 10%, prior to introducing the wood pulp to a low temperature bleaching...
5685953 Ozone bleaching with an organic solvent and mineral acid  
A bleached pulp having a high viscosity for a given permanganate number is formed by pretreating never dried pulp with an organic solvent medium to produce a treated pulp composed of said never...
5658429 Process for bleaching of lignocellulose-containing pulp using a chelating agent prior to a peroxide-ozone-peroxide sequence  
A process for delignification and bleaching of chemically digested lignocellulose-containing pulp, where the pulp is treated with a complexing agent at a pH between 3.1 and 9.0, whereupon the pulp...
5656130 Ambient temperature pulp bleaching with peroxyacid salts  
The present invention relates to a Kraft pulp bleaching stage which is to be carried out after conventional bleaching stages to high brightness. It has been discovered that ambient-temperature...
5645687 Process for manufacturing bleached pulp with reduced chloride production  
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide or...
5645686 Process for bleaching a pulp in a sequence including an enzyme stage  
Process for bleaching a chemical paper pulp by means of a sequence of treatment stages involving at least one stage with an enzyme and at least one stage with a peroxyacid.
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...
5630909 Pulp fluffing gas contactor  
A guide vane is provided in a pin fluffer to assist in pulp mat retention during fluffing by providing a cyclic lift component to the mat as it passes over the vane thereby also further increasing...
5618385 Method of peroxide bleaching of pulp using a peroxide decomposing inactivator  
Chlorine dioxide is used to stabilize hydrogen peroxide in bleach liquor at alkaline pH. This is thought to be aided by the destruction of enzymes (especially catalase) produced by bacteria. The...
5611889 Exothermic bleaching of high-yield pulps simultaneously with oxygen and borohydride  
A process for bleaching high-yield (mechanical or chemi-mechanical) pulps to high brightnesses and low yellownesses (b*) in a single treatment employs di-oxygen gas (O 2 ), alkaline agent and a...
5609723 Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector  
An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp...
5609762 Cellulose membranes comprising cotton fibers and method of manufacturing them  
In a method for manufacturing cellulose membranes in the form of flat films, tubular films, or hollow filaments with improved biocompatibility, cotton fibers, in particular linters, are treated in...
5607545 Ozone bleaching process utilizing a fluidizing mixer and super-atmospheric pressure  
Method and apparatus for ozone bleaching a medium consistency cellulosic fiber suspension include feeding the fiber suspension and an ozone in carrier gas stream under pressure into a fluidizing...
5605604 Method of reducing the resin content in sulfite pulp  
Provided is a method for reducing resin content in sulfite pulp, in an ozone bleaching process where the sulfite pulp is bleached using ozone, at a pulp concentration of about 6 to about 14% by...
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...
5591304 Method for the use of enzymes in bleaching paper pulp  
A method and apparatus for treating wood pulp that includes incompletely washed brownstock, in which the brownstock is treated at a pH range of approximately 7.0 to 9.0 with a hemicellulase enzyme...
5589031 Chlorine dioxide bleaching of chemical pulp  
A method of bleaching chemical pulp in a sequence comprising at least four bleaching steps with final bleaching in a first and a second chlorine dioxide step. Between the chlorine dioxide steps an...
5571378 Process for high-pH metal ion chelation in pulps  
Process for high pH metal ion chelation in pulps. Extraction and removal of detrimental metal ions and organic solvent extractives prior to delignification and bleaching is carried out on pulp,...
5567274 Method of controlling pressurized ozone to a pulp delignification reactor  
A method and apparatus supply ozone containing gas under superatmospheric pressure to an ozone delignification device. The speed of a water ring compressor is controlled so that it compresses as...
5549789 Oxidation of lignin and polysaccharides mediated by polyoxometalate treatment of wood pulp  
A method for oxidative degradation of lignin and polysaccharide fragments dissolved during polyoxometalate delignification or bleaching of wood pulp, wood fiber or pulp obtained from a non-woody...
5540816 Method of integrating bleaching and recovery in the production of pulp  
A method of integrating bleaching and recovery in connection with the production of chemical pulp that has been digested and preferably delignified with oxygen gas using processes that retain the...
5534115 Process for preserving the mechanical strength properties of chemical paper pulps  
Process for preserving the mechanical strength properties of a chemical paper pulp, comprising two treatment stages by means of a peroxidic reagent, with the first stage in an acidic medium and the...
5529662 Method of bleaching cellulosic pulps with ozone and a protective amount of an N-alkylated urea  
Cellulosic pulps are bleached with ozone in an ozone bleaching stage in an aqueous medium containing an additive in an effective amount not exceeding 5% weight concentration of the aqueous medium....
5529660 Method of reducing fluorescence in deinked pulp by treating pulp with ozone and a bleaching agent  
Provided herewith is a process for reducing the fluorescence of pulp fibers. The process comprises contacting the pulp fibers with ozone in two or more stages, with an intermediate washing stage or...
5525195 Process for high consistency delignification using a low consistency alkali pretreatment  
Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the...
5520783 Apparatus for bleaching high consistency pulp with ozone  
An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a...
Matches 101 - 150 out of 389 < 1 2 3 4 5 6 7 8 >