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    • 1. 发明申请
    • FRACTIONATION OF A WASTE LIQUOR STREAM FROM NANOCRYSTALLINE CELLULOSE PRODUCTION
    • 来自纳米晶体纤维素生产的废液流的分离
    • WO2011017797A1
    • 2011-02-17
    • PCT/CA2010/001198
    • 2010-07-28
    • FPINNOVATIONSJEMAA, NaceurPALEOLOGOU, MichaelZHANG, Xiao
    • JEMAA, NaceurPALEOLOGOU, MichaelZHANG, Xiao
    • C01B17/90B01D61/00C08B1/00D21C11/00
    • D21C9/00B01D61/027C01B17/902C08B15/08D21C11/0007
    • During nanocrystalline cellulose (NCC) production, a considerable amount of sulphuric acid is used. After the separation of the NCC, the remaining solution contains sugars and residual sulphuric acid. The sugars are in the monomeric and oligomeric forms. To reduce the cost of NCC production and to produce other added-value products, the spent acid stream can be fractionated into sugar oligomers, sugar monomers, and acid. The acid can be recycled to the NCC manufacturing process after concentration. The sugar monomers and sugar oligomers can be used for the manufacturing of other valuable chemicals. Membrane nanofiltration can be used to achieve this objective. A polymeric membrane with a molecular weight cut-off in the range of 200 Dalton was employed. Using this approach, the majority of the acid was recovered in the permeate while the sugars were concentrated in a smaller stream. The sugar level in the separated acid/permeate stream was only about 3% of the original concentration. A second membrane filtration stage can be used to separate the monomeric from the oligomeric sugars. The two sugar streams can be employed in different applications to produce value-added products.
    • 在纳米晶纤维素(NCC)生产过程中,使用了大量的硫酸。 在分离NCC后,剩余的溶液含有糖和残留的硫酸。 糖是单体和低聚物形式。 为了降低NCC生产成本和生产其他附加值产品,废酸流可以分馏成糖低聚物,糖单体和酸。 浓缩后,酸可以回收到NCC制造过程。 糖单体和糖低聚物可用于制造其他有价值的化学品。 膜纳米过滤可以用来达到这个目的。 使用分子量截止值在200道尔顿范围内的聚合物膜。 使用这种方法,大部分酸在渗透物中回收,而糖被浓缩在较小的流中。 分离的酸/渗透物流中的糖含量仅为原始浓度的约3%。 可以使用第二膜过滤阶段将单体与低聚糖分离。 这两种糖流可用于不同的应用,以产生增值产品。
    • 2. 发明申请
    • TREATMENT OF CHLORINE DIOXIDE GENERATOR EFFLUENT AND FEED STREAMS WITH FIXED-RESIN BED
    • 二氧化氯发生器液体和固定树脂进料流的处理
    • WO9816462A9
    • 1999-04-01
    • PCT/CA9700750
    • 1997-10-09
    • PULP PAPER RES INSTECO TECPALEOLOGOU MICHAELTHOMPSON ROKHSAREHBROWN CRAIG JSHEEDY MICHAEL
    • PALEOLOGOU MICHAELTHOMPSON ROKHSAREHBROWN CRAIG JSHEEDY MICHAEL
    • B09B3/00B01J39/04C01B11/02C01B17/90C01D5/16C02F1/44D21C9/14
    • C01B17/904C01B11/023C01D5/16Y10S423/14
    • A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition, sulfuric acid is purified providing an opportunity for reuse in various mill applications, and/or concentrated and recycled to the generator. Alternatively, to avoid high evaporation costs, the purified acid can be used to regenerate a cation-exchange unit (CEU) used in the conversion of sodium chlorate to a sodium chlorate/chloric acid mixture which is fed to the generator in place of sodium chlorate and sulfuric acid. Using this approach, the sulfuric acid requirement of chlorine dioxide generators and, in turn, the amount of acidic generator effluent can be reduced. The process is applicable to both atmospheric and subatmospheric chlorine dioxide generators. In the latter case, the concentration of the purified sulfuric acid from the ARU or any other acid separation system can be increased by using a portion of it to dissolve the sodium sesquisulfate by-product from such generators.
    • 一种使用固定树脂床酸延迟单元(ARU)将废酸从二氧化氯发生器分离成脱酸的硫酸钠组分和纯化的硫酸组分的方法。 所产生的脱酸硫酸钠返回到牛皮纸磨机的化学回收循环,代替酸性二氧化氯发生器流出物,从而避免纸浆厂液中碱度的破坏。 此外,纯化硫酸提供了在各种研磨应用中再利用的机会,和/或浓缩并再循环到发生器中。 或者,为了避免高的蒸发成本,可以使用纯化的酸来再生用于将氯酸钠转化成氯酸钠/氯酸混合物的阳离子交换单元(CEU),该氯酸钠/氯酸混合物被供给到发生器代替氯酸钠 和硫酸。 使用这种方法,可以减少二氧化氯发生器的硫酸需求,进而降低酸性发生器流出物的量。 该方法适用于大气和低气压的二氧化氯发生器。 在后一种情况下,来自ARU或任何其它酸分离系统的纯化硫酸的浓度可以通过使用其一部分来从这种发生器中溶解倍半硫酸钠副产物而增加。
    • 3. 发明申请
    • TREATMENT OF CHLORINE DIOXIDE GENERATOR EFFLUENT AND FEED STREAMS WITH FIXED-RESIN BED
    • 二氧化氯发生器液体和固定树脂进料流的处理
    • WO1998016462A1
    • 1998-04-23
    • PCT/CA1997000750
    • 1997-10-09
    • PULP AND PAPER RESEARCH INSTITUTE OF CANADAECO-TEC LIMITEDPALEOLOGOU, MichaelTHOMPSON, RokhsarehBROWN, Craig, J.SHEEDY, Michael
    • PULP AND PAPER RESEARCH INSTITUTE OF CANADAECO-TEC LIMITED
    • C01B11/02
    • C01B17/904C01B11/023C01D5/16Y10S423/14
    • A process employing a fixed-resin bed Acid Retardation Unit (ARU) to separate spent acid from chlorine dioxide generators into a de-acidified sodium sulfate component and a purified sulfuric acid component. The de-acidified sodium sulfate produced is returned to the chemical recovery cycle of the kraft mill in place of acidic chlorine dioxide generator effluent thereby avoiding the destruction of alkalinity in pulp mill liquors. In addition, sulfuric acid is purified providing an opportunity for reuse in various mill applications, and/or concentrated and recycled to the generator. Alternatively, to avoid high evaporation costs, the purified acid can be used to regenerate a cation-exchange unit (CEU) used in the conversion of sodium chlorate to a sodium chlorate/chloric acid mixture which is fed to the generator in place of sodium chlorate and sulfuric acid. Using this approach, the sulfuric acid requirement of chlorine dioxide generators and, in turn, the amount of acidic generator effluent can be reduced. The process is applicable to both atmospheric and subatmospheric chlorine dioxide generators. In the latter case, the concentration of the purified sulfuric acid from the ARU or any other acid separation system can be increased by using a portion of it to dissolve the sodium sesquisulfate by-product from such generators.
    • 一种使用固定树脂床酸延迟单元(ARU)将废酸从二氧化氯发生器分离成脱酸的硫酸钠组分和纯化的硫酸组分的方法。 所产生的脱酸硫酸钠返回到牛皮纸磨机的化学回收循环,代替酸性二氧化氯发生器流出物,从而避免纸浆厂液中碱度的破坏。 此外,纯化硫酸提供了在各种研磨应用中再利用的机会,和/或浓缩并再循环到发生器中。 或者,为了避免高的蒸发成本,可以使用纯化的酸来再生用于将氯酸钠转化成氯酸钠/氯酸混合物的阳离子交换单元(CEU),该氯酸钠/氯酸混合物被供给发生器代替氯酸钠 和硫酸。 使用这种方法,可以减少二氧化氯发生器的硫酸需求,进而降低酸性发生器流出物的量。 该方法适用于大气和低气压的二氧化氯发生器。 在后一种情况下,来自ARU或任何其它酸分离系统的纯化硫酸的浓度可以通过使用其一部分来从这种发生器中溶解倍半硫酸钠副产物而增加。