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    • 13. 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
    • US20120211184A1
    • 2012-08-23
    • US13388455
    • 2010-07-28
    • Naceur JemaaMichael PaleologouXiao Zhang
    • Naceur JemaaMichael PaleologouXiao Zhang
    • D21C9/00
    • 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。