Matches 151 - 200 out of 389 < 1 2 3 4 5 6 7 8 >
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5507913 Solvent recovery in pulp bleaching with ozone  
A process for bleaching pulp by impregnating the pulp with an aqueous organic solvent medium and then bleaching in an ozone stage (Z stage) to form a bleached pulp characterized in that organic...
5500086 Method for producing pulp from green algae  
Method for producing pulp by using an alga containing cellulose in the cell wall and having the long algae body with the ratio of length to width being 10 to 200 as an ingredient by giving no...
5487812 Treatment of alkaline bleached mechanical wood pulp with pectinase  
The present invention relates to a method of making paper from bleached or alkaline treated pulp by dewatering pulp containing bleached or alkaline treated vegetable fibers from wood or non-wood...
5472568 Method for controlling the viscosity of Kraft black liquor  
An improved method of chemical recovery from kraft black liquor is disclosed in which the heat generated by controlled oxidation of the liquor is utilized to reduce the viscosity and net heating...
5472572 Reactor 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...
5472567 Method of chemically reacting a slurry with a gas  
A number of different, efficient treatments of slurries and liquid with gas can be provided. A slurry or liquid is introduced into a first end of a vortex. A gas--such as a chemically reactive...
5464501 Bleaching recycled pulp with a reductive-oxidative sequence  
The invention relates to a method of bleaching waste paper pulp. The pulp is first treated to a reductive chemical followed by acidification and washing or dewatering. The pulp is then subjected to...
5462641 Process for bleaching pulp with adsorption of metals  
A process for bleaching pulp, in which, after fiber liberation, a first filtrate containing metals, principally in ionic form, is separated off from the pulp, and supplied downstream to the pulp...
5460696 Oxygen delignification method incorporating wood pulp mixing apparatus  
An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located...
5456799 Method for controlling activation of lignocellulosic material in the presence of a nitrate containing liquid  
The method solves the problem of delignifying technical cellulose pulp in a selective manner which will result in very low residual contents of lignin in the pulp and a correspondingly high...
5451296 Two stage pulp bleaching reactor  
A two stage ozone-pulp bleaching method and apparatus are disclosed. In the first stage, high consistency pulp particles are turbulently mixed and contacted with a gaseous mixture containing ozone...
5441603 Method for chelation of pulp prior to ozone delignification  
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater...
5415734 Process for bleaching pulp without using chlorine containing chemicals  
A process is disclosed for bleaching pulp without chlorine containing chemicals and for greatly reducing total washing filtrate discharge, comprising the steps of: 1) sending pulp that has been...
5411634 Medium consistency ozone bleaching  
In a method of bleaching medium consistency pulp with ozone using a mixer, ozone containing gas and about 6-15% consistency pulp are fed to the mixer, and then discharged in a first, preferably...
5411635 Ozone/peroxymonosulfate process for delignifying a lignocellulosic material  
A process for delignifying a lignocellulosic material comprising exposing the material to a mixture of peracid and ozone. Preferred peracids include Caro's acid and peracetic acid. Also disclosed...
5411633 Medium consistency pulp ozone bleaching  
Medium consistency (e.g. about 6-15%) paper pulp is effectively bleached with ozone in a carrier gas (typically oxygen) by effecting efficient separation of carrier gas from the pulp after reaction...
5409570 Process for ozone bleaching of oxygen delignified pulp while conveying the pulp through a reaction zone  
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine or chlorine-containing compounds by oxygen delignifying the pulp to a K No. of about 14 or less...
5403441 Method for controlling an ozone bleaching process  
A method for controlling the gas recycle loop of an ozone bleaching process wherein an ozone generator produces an ozone containing gas from an oxygen containing feed gas and delivers the ozone...
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...
5397434 Method for distributing cellulosic pulp through a reactor at a constant upward velocity  
Method for the treatment of cellulosic pulp in which pulp is distributed upward through a vertical reactor using a unique conical distributor and is discharged using a unique dilution method to...
5389201 Bleaching of kraft cellulosic pulp employing ozone and reduced consumption of chlorine containing bleaching agent  
In a multi-stage bleaching sequence for kraft pulps employing a chlorine-containing bleaching agent in the first and final stages thereof and an intermediate alkaline extraction stage, the...
5387317 Oxygen/ozone/peracetic aicd delignification and bleaching of cellulosic pulps  
A method for delignification and bleaching of cellulosic pulp which comprises reacting a cellulosic pulp with peracetic acid, ozone and oxygen under conditions of acidic pH. The ozone substantially...
5385641 Delignification of cellulosic raw materials using acetic acid, nitric acid and ozone  
In a three-stage process for the delignification of cellulose-containing raw materials, pulping is initially performed with a solution of concentrated aqueous acetic acid at an elevated temperature...
5382326 Ozone mixing test apparatus  
Laboratory equipment for practicing experiments and mixing ozone with medium consistency cellulosic pulp allows precise control of the timing and amount of ozone injected into the mixer, providing...
5368688 Method for bleaching pulp with ozone with successive steps of lower consistency  
A method for bleaching pulp with ozone and, more specifically, to a method for bleaching pulp without deterioration of pulp quality. The starting material is a medium consistency pulp with easy...
5364505 Pressurized ozone pulp delignification reactor and a compressor for supplying ozone to the 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...
5364503 Nitric oxide treatment for ozone bleaching  
A method of bleaching a chemical pulp by adjusting the pH of the pulp to 1.5-3.5, chelating the pulp and then treating the pulp in an N stage with nitric oxide (NO) in the amount of at least 1.5%...
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...
5354423 Ozone dioxane bleaching of chemical pulps  
A method of bleaching a chemical pulp with a gaseous bleaching agent by uniformly impregnating the pulp with a solvent for lignin and that is fully miscible with water but does not significantly...
5346588 Process for the chlorine-free bleaching of cellulosic materials with ozone  
A process for the chlorine-free bleaching of pulps in an aqueous suspension which comprises forming the suspension with a consistency of 3 to 20 mass percent; introducing into the suspension an...
5328564 Modified digestion of paper pulp followed by ozone bleaching  
Kraft pulp is bleached to a brightness of about 90 CPPA or greater, without the use of chlorinated organic compounds that has commercially acceptable strength properties. During production of the...
5322647 Oxygen bleaching of cotton linters by disproportionation of hydrogen peroxide  
In a process for chlorine-free bleaching of cellulose with an α-cellulose content of more than 90%, preferably from boiled cotton linters, more than 75% whiteness is achieved in a single-stage...
5314583 Process for the comminution of materials and plant 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...
5310458 Process for bleaching lignocellulose-containing pulps  
The invention relates to a process for bleaching chemically delignified lignocellulose-containing pulp, to render more efficient a peroxide-containing treatment stage, by treating the pulp with a...
5302244 Oxygen delignification of waste cellulosic paper products  
Waste cellulosic paper products, for example, old corrugated containers are recycled employing oxygen delignification in the presence of an alkaline material to produce a recycled pulp of lower...
5296099 Environmentally improved process for bleaching lignocellulosic materials with oxygen, ozone and chlorine dioxide  
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater...
5296097 Method for reducing contaminants in pulp prior to ozone bleaching  
A process for conditioning an ozone gas recycle stream in an ozone pulp bleaching process, wherein the level of carbon dioxide in the recycle stream is controlled to allow full capacity operation...
5277760 Process for the manufacture of pulp for paper, and fiberboard products using alkaline cooking chemical and oxygen in a closed, continuous and pressurized tube system  
Process for producing pulp suitable as raw material for paper, board or fiberboards and similar products. A pumpable alkaline slurry of fibrous raw material is conducted through a pressurized tube...
5268075 High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process  
A high-efficiency wood pulp bleaching process to produce wood pulps with higher brightness at equal chlorine dioxide usage or of equal brightness at significantly reduced chlorine dioxide usage....
5246543 Process for bleaching and delignification of lignocellulosic materials  
Delignification and bleaching of lignocellulosic material is enhanced after the pulp has been treated with peroxomonosulfuric acid.
5234544 Cleaning and bleaching of secondary fiber  
Secondary pulp is deinked and bleached by contacting the pulp simultaneously with oxygen, alkali, and a surfactant in a reaction zone followed by washing to recover a secondary fiber product....
5217575 Process for oxygen bleaching using two vertical reactors  
A process for oxygen bleaching fibrous cellulose pulp is described in which the pulp passes a first delignification zone with a predetermined low temperature and a second delignification zone with...
5217574 Process for oxygen delignifying high consistency pulp by removing and recycling pressate from alkaline pulp  
Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The...
5211811 Process for high consistency oxygen delignification of alkaline treated pulp followed by ozone delignification  
A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine by partially delignifying the pulp to a K No. of about 10 or less and a viscosity of greater...
5179021 Pulp bleaching process comprising oxygen delignification and xylanase enzyme treatment  
Process for bleaching lignocellulosic material comprising an oxygen bleaching treatment and an enzymatic treatment with a substantially cellulase-free xylanase, which process is compatible with,...
5174861 Method of bleaching high consistency pulp with ozone  
A method for delignifying and bleaching a lignocellulosic pulp with a gaseous bleaching agent in a reactor without the use of elemental chlorine. The bleaching reactor is a horizontal vessel having...
5173153 Process for enhanced oxygen delignification using high consistency and a split alkali addition  
Unbleached pulp is combined with an aqueous alkaline solution while in a state of low consistency to distribute a first amount of alkaline material substantially uniformly throughout the pulp. The...
5160581 Method for oxygen bleaching paper pulp  
A fluid is continously processed by being fed to the top of a hydraulic downdraft tube (15) which forms a downdraft column which is of a height such that the pressure at the bottom thereof will...
5145557 Chlorine-free bleaching method for dissolving-grade pulps using an OP-Z-P sequence  
A three-stage bleaching process for dissolving grade pulp utilizes the sequence OP(alkaline)-Z-P and the off gas from the Z-stage is delivered to the alkaline (OP)-stage whose parameters are...
5133946 Process for bleaching cellulosic materials and plant for carrying out the process  
There is disclosed a process and a plant for bleaching cellulosic materials by aid of ozone. A concentrated solution of ozone in an aqueous medium (strong water) is supplied under pressure to the...
Matches 151 - 200 out of 389 < 1 2 3 4 5 6 7 8 >