Class / Patent application number | Description | Number of patent applications / Date published |
162078000 | Per-compound (e.g., peroxide, perborate) | 12 |
20080202714 | METHODS AND SYSTEMS FOR THE USE OF RECYCLED FILTRATE IN BLEACHING PULP - A system for the bleaching of lignocellulosic pulp including: a first oxygen reactor and a second oxygen reactor connected in series to the first oxygen reactor, wherein each reactor bleaches the pulp; an upstream pulp washer that washes pulp and discharges washed pulp to a first pulp conduit having an outlet coupled to the first oxygen reactor; an oxygen supply conduit connected to the first pulp conduit and supplying oxygen to the washed pulp flowing through the first pulp conduit; a downstream pulp washer that washes bleached pulp discharged from the second oxygen reactor; a filtrate conduit receiving filtrate discharged from the downstream pulp washer; a second pulp conduit receiving bleaches pulp discharged from the first oxygen reactor and conveying the bleached pulp to the second oxygen reactor, wherein the filtrate conduit is connected to the second pulp conduit such that at least a portion of the filtrate in the filtrate conduit flows into the second pulp conduit, and a second oxygen supply conduit connected to the second pulp conduit and introducing oxygen to the pulp flowing through the conduit. | 08-28-2008 |
20090065159 | CHEMICAL PULP TREATMENT COMPOSITIONS AND METHODS - The present invention relates to compositions and methods for treating pitch problems in chemical pulp by treating chemical pulp process water with a combination of a lipase and a peroxide source. The present invention also relates to compositions and methods for treating pitch problems in chemical pulp by treating chemical pulp process water with a lipase, a peroxide source and organic acid(s). | 03-12-2009 |
20090205795 | Combined process of peroxide bleaching of wood pulps and addition of optical brightening agents - A process for improving optical properties of high-yield pulp (HYP) for producing paper products with superior brightness. Optical brightening agents (OBAs) can effectively improve the optical properties of high-yield pulp (HYP). The present process involves incorporating the OBAs into the alkaline peroxide bleaching process. By combining peroxide bleaching with an optical brightening agent, one can decrease the bleaching cost to reach the same brightness target. Some key advantages of adding OBA to HYP at the pulp mill over the conventional wet-end addition of OBA include: i) the quenching effect on OBA by the wet-end cationic polymers such as PEI is decreased by fixing OBA on HYP fibers; ii) the negative impact of metal ions in the white water system on the OBA performance is minimized when OBA is pre-adsorbed and fixed on HYP fibers; iii) the photo-yellowing (color reversion) of HYP and HYP-containing paper sheets is decreased when more OBA is on HYP fibers to protect them from harmful UV radiation. | 08-20-2009 |
20110315331 | PROCESS FOR MANUFACTURING PULP, PAPER AND PAPERBOARD PRODUCTS - A process for bleaching mechanical wood pulp is provided comprising subjecting the wood pulp to at least one bleaching stage with one or more bleaching agents in the presence of one or more optical brightening agent, wherein the bleaching agents are selected from the group consisting of oxidative bleaching agents other than chlorine based bleaching agents such as chlorine dioxide, elemental chlorine or a combination thereof, reductive bleaching agents or any combination of two or more thereof. | 12-29-2011 |
20120031575 | Pulp Bleaching and Alkaline Extraction Method - A method of treating lignocellulosic pulp in which an aqueous pulp mixture is treated with a bleaching agent and then subjected to an alkaline extraction at a reduced pH with a combination of alkaline agents comprising caustic soda and soda ash and using caustic soda for pH control. | 02-09-2012 |
20130098571 | CHEMICAL ACTIVATION AND REFINING OF SOUTHERN PINE KRAFT FIBERS - A method for alteration of the morphology of cellulose fibers, particularly softwood fibers, by (a) subjecting the fibers to a metal ion-activated peroxide treatment carried out at a pH of between about 1 and about 9, preferably between 3 and 7, and (b) subjecting the treated fibers to a refining treatment thereby converts SW fibers to | 04-25-2013 |
20140000825 | Chemical Activation and Refining of Southern Pine Kraft Fibers | 01-02-2014 |
20150007953 | LIGNO CELLULOSIC MATERIALS AND THE PRODUCTS MADE THEREFROM - A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position. | 01-08-2015 |
20150101771 | MANUFACTURING FEEDSTOCK FROM FRUIT BY-PRODUCT PROCESSING - A system and method of manufacturing a feedstock for producing paper fiber from fruit of a plant may include providing a by-product source inclusive of fiber from the edible fruit after a process for removing a majority of the edible fruit is used to produce a food. One or more treatment processes to brighten the fruit by-product may be performed. The feedstock may be produced from the brightened fruit by-product. | 04-16-2015 |
20160002849 | Softwood Kraft Fiber Having an Improved A-Cellulose Content and its Use in the Production of Chemical Cellulose Products - A bleached softwood kraft pulp fiber with high α-cellulose content and a low CED viscosity is provided, A surfactant treated fiber useful in the production of chemical derivatives is also described. Methods for making the kraft pulp fiber and products made from it are also described. | 01-07-2016 |
20160032524 | A Low Viscosity Kraft Fiber Having an Enhanced Carboxyl Content and Methods of Making and Using the Same - A pulp fiber with an enhanced carboxyl content resulting in improved antimicrobial, anti-yellowing and absorptive properties. Methods for making the kraft pulp fiber and products made from it are also described. | 02-04-2016 |
20160138219 | COMPOSITIONS FOR BLEACHING PULPS AND THEIR USE - Compositions suitable for use in the bleaching of pulps may include one or more particulate alkaline earth metal oxides or alkaline earth metal hydroxides or mixtures thereof, and one or more pitch control additives. The compositions may be suitable for use in a pulp preparation or a papermaking process. A method for the bleaching of pulps may include providing the composition. | 05-19-2016 |