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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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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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5779856 |
Cooking cellulose material using high alkali concentrations and/or high pH near the end of the cook
Chemical (typically kraft) pulp having enhanced intrinsic fiber strength and bleachability compared to pulp produced using conventional or modified kraft cooking is produced by using high alkali...
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5626717 |
Oxidative treatment of bleach plant effluent
The invention described in the specification relates to a process and apparatus for the reduction of adsorbable organic halide (AOX), chemical oxygen demand (COD) and color bodies from the...
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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...
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5246542 |
Evaporation and recovery process for bleached chemical thermo-mechanical pulp (BCTMP) effluent
The invention disclosed here is a process or system for treating the effluent from a BCTMP pulp mill. The effluent is evaporated to produce a water condensate and a remaining waste product...
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5120448 |
Removal of AOX FRM bleach plant mill effluents by pH shift using the alkalinity/acidity sources available at the mill
A process for removal of adsorbable organic chlorine (AOX) in which the acid-soluble AOX present in kraft chlorination (CD) effluents are destablized and converted to inorganic chloride by pH shift...
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4799994 |
Process for cooking and bleaching pulp
A process for cooking and bleaching pulp in a closed system, wherein spent liquors from the cooking and the bleaching are recovered and their chemicals are regenerated and recycled as cooking and...
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4507172 |
Kraft pulping process
A process of producing cooking liquor for addition to a digester for enhancement of the yield derived from kraft pulping of wood chips in which a portion of the black liquor is treated with lime...
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4334956 |
Method of reutilizing kraft spent liquor
A method of utilizing kraft black liquor by converting the black liquor to "green liquor" and then oxidizing the green liquor with air in the presence of a quinone compound or spent liquor from the...
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4253911 |
Process for maintaining a low sodium chloride content in recycled sodium chemicals of sodium-based pulp manufacturing processes
A process is provided for the separation of sodium chloride in the sodium chemicals recovery stage of sodium-based pulp manufacturing processes so as to maintain a low sodium chloride content in...
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4249990 |
Process for removal of potassium values from pulp mill liquors
The accumulation of potassium values in a closed cycle pulp mill process usually using sodium hydroxide as a pulping chemical is prevented by removal of potassium values as potassium chloride by...
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4155806 |
Method for continuous alkaline delignification of lignocellulose material in two or more steps, the final of which with oxygen
This invention relates to a process for multi-stage alkaline pulping of ligno-cellulosic raw materials and recovery of delignification spent liquors, i.e. black liquor from digestion with white...
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4153502 |
Process for the production of polysulphide pulping liquor from pulp mill recovery smelt
Sodium polysulphide is formed by reacting sodium sulphide and sodium sulphur-oxygen salts in the presence of carbon and oxygen. The invention is particularly applicable to reacting recovery furnace...
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4138312 |
Process of recovering sodium carbonate from spent pulping liquors
The incinerator product obtained from the incineration of black liquor and other spent liquors from a soda pulping process is treated to remove contaminants including chlorides, sulphates and...
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4131508 |
Recovery system for oxygen bleaching of pulp
A method is provided for recovery of white liquor and sodium hydroxide following the oxygen bleaching of pulp. A green liquor recovery system concentrates the spent black liquor, including spent...
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4118271 |
Method for the preparation of a pulp
A process for the preparation of a pulp, involving the steps of mechanically milling a fibrous vegetable material at an elevated temperature, delignifying the milled material by reaction with a...
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4098639 |
Process for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material
A process is provided for reducing the requirement of fresh chemicals without increasing emissions in the pulping of cellulosic material with alkaline sodium- and sulfur-containing-sulfate pulping...
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4073678 |
High yield semichemical wood pulping process
70 To 85% yield semichemical wood pulping may be prepared for mechanical defibration by cooking comminuted hardwood in a continuous digestion vessel with an alkaline cooking solution wherein 50 to...
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4011129 |
Pulp mill recovery system
A method of increasing the chemical recovery capacity of a Kraft Recovery Furnace by injecting solid pellets of sodium sulphate and sodium carbonate directly onto the char bed in the reducing zone...
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3833464 |
METHOD OF DECOLORIZING PAPER MILL EFFLUENT LIQUID
Effluent liquid normally discharged by paper mills is ecologically undesirable for return to streams, lakes or the like by reason of the presence of color-imparting substances, e.g., color bodies,...
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3622443 |
CHEMICAL RECOVERY SYSTEM FOR USE IN A PULPING PROCESS
A method for the utilization and recovery of sodium and sulfur values used in pulping processes which method includes contacting a first portion of a bisulfite sulfite solution with the smelt...
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3617434 |
REGENERATION OF COOKING CHEMICALS FROM SPENT ALKALINE COOKING LIQUOR
A process for recovering useful chemicals from spent alkaline cooking liquor of high sulfide content produced in the course of wood pulp manufacture. The spent cooking liquor is concentrated and...
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3531370 |
COLOR REMOVAL FROM WASTE EFFLUENTS
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3811995 |
METHOD OF HIGH YIELD SEMICHEMICAL PULP PRODUCTION
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3736254 |
SYSTEM FOR REMOVING COLOR FROM PAPER MILL LIQUID WASTE
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3654071 |
PROCESS FOR REPLACING SODIUM AND SULFUR LOSSES AND FOR CONTROLLING THE SULFIDE CONTENT IN SODIUM- AND SULFUR-CONTAINING CELLULOSIC DIGESTING LIQUORS
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3453174 |
PULPING AND BLEACHING PROCESS WHEREIN EFFLUENT LIQUOR FROM ALKALINE EXTRACTION OF BLEACHED PULP IS USED TO DISSOLVE SMELT
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3396076 |
Method of recovery of chemical values of a kraft pulping process of cellulosic material
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3210236 |
Combined acid sulfite and modified sulfate pulping process with recovery cycle
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3130115 |
Method of processing lignified cellulose
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3120464 |
Decolorizing kraft waste liquors
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3003908 |
Processes of preparing cooking liquor for neutral sulphite digestion of cellulosic material
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2974081 |
Method for integrating sodium based sulfite and sulfate pulping processes
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2841561 |
Recovery of chemicals from smelt solutions
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