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公开(公告)号：US6017415A
公开(公告)日：2000-01-25
申请号：US924360
申请日：1997-09-05
申请人： Richard B. Phillips , Linda A. Beltz , Craig Forehand , Wayne Christopherson , James A. McCann , Thomas E. Amidon , Jean J. Renard , Roger H. Purrington
发明人： Richard B. Phillips , Linda A. Beltz , Craig Forehand , Wayne Christopherson , James A. McCann , Thomas E. Amidon , Jean J. Renard , Roger H. Purrington
CPC分类号： D21C3/00 , D21C5/02 , Y02W30/648
摘要： A method wherein waste cellulosic material is used as an alternative fiber source during chemical pulping to replace a fraction of the wood chips. The waste cellulosic material is fed to the digester along with wood chips. The waste cellulosic material need not be repulped or slurried prior to digestion. The wood chips may be any species of hardwood or softwood. Normal chemical pulping charges, temperatures and cooking times applied in the case of 100% wood chip pulping may be used for the co-pulping of waste cellulosic material and wood chips. Thereafter, the pulp is processed as usual for chemical pulping, including the steps of blowing the digester, washing and thickening the brown stock, and bleaching the brown stock under the normal conditions used for the component co-pulped with the waste cellulosic material. Further screening or cleaning steps may be required to remove debris from waste cellulosic material.
摘要翻译： 一种在化学制浆期间将废纤维素材料用作替代纤维源以取代一部分木屑的方法。 废弃的纤维素材料与木屑一起进料到蒸煮器。 废纤维素材料在消化之前不需要重新制浆或浆化。 木屑可以是硬木或软木的任何种类。 在100％木屑制浆的情况下应用的正常化学制浆装料，温度和烹饪时间可用于废纤维素材料和木屑的共制浆。 此后，纸浆按常规进行化学制浆处理，包括吹扫蒸煮器，洗涤和增稠棕色坯料，以及在用于与废纤维素材料共同制备的组分的常规条件下漂白棕色坯料的步骤。 可能需要进一步的筛选或清洁步骤以从废弃的纤维素材料中除去碎屑。
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公开(公告)号：US06475447B1
公开(公告)日：2002-11-05
申请号：US09651524
申请日：2000-08-29
IPC分类号： B01D900
CPC分类号： C01D5/00
摘要： The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone and a mixing zone. Slurry containing sesquisulfate crystals is introduced into the mixing zone along with water and the material is mixed to promote dissolution of the crystals and formation of sodium sulfate solids. Sodium sulfate solids are collected in a lower portion of the treatment vessel and conveyed out of the vessel, and liquid from the clarifying zone is conducted from an upper end of the treatment vessel to a conventional liquid processing unit. Treatment of a sesquisulfate-containing slurry in accordance with the invention provides sodium sulfate containing little or no sesquisulfate crystals thereby reducing the need for vacuum filtration or other expensive separation techniques to recover sulfuric acid and sodium sulfate solids from the slurry.
摘要翻译： 本说明书公开了一种处理含有倍半硫酸钠的浆料以从其中回收硫酸盐和酸成分的装置和方法。 该设备包括具有描绘澄清区和混合区的分隔壁的处理容器。 将含有倍半硫酸盐晶体的浆料与水一起引入混合区，并将该物质混合以促进晶体的溶解和形成硫酸钠固体。 将硫酸钠固体收集在处理容器的下部并输送到容器中，并且来自澄清区的液体从处理容器的上端传导到常规的液体处理单元。 根据本发明的处理含有倍半硫酸盐的浆料提供了含有很少或不含有四异硫酸盐晶体的硫酸钠，从而减少了对真空过滤或其它昂贵的分离技术从浆料中回收硫酸和硫酸钠固体的需要。
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公开(公告)号：US6126702A
公开(公告)日：2000-10-03
申请号：US36820
申请日：1998-03-09
CPC分类号： C01D5/00
摘要： The specification discloses an apparatus and method for treating a slurry containing sodium sesquisulfate to recover sulfate and acid constituents therefrom. The apparatus includes a treatment vessel having a separation wall delineating a clarifying zone and a mixing zone. Slurry containing sesquisulfate crystals is introduced into the mixing zone along with water and the material is mixed to promote dissolution of the crystals and formation of sodium sulfate solids. Sodium sulfate solids are collected in a lower portion of the treatment vessel and conveyed out of the vessel, and liquid from the clarifying zone is conducted from an upper end of the treatment vessel to a conventional liquid processing unit. Treatment of a sesquisulfate-containing slurry in accordance with the invention provides sodium sulfate containing little or no sesquisulfate crystals thereby reducing the need for vacuum filtration or other expensive separation techniques to recover sulfuric acid and sodium sulfate solids from the slurry.
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