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    • 5. 发明专利
    • Heavy metal adsorbent
    • 重金属吸附剂
    • JPS61133143A
    • 1986-06-20
    • JP25353884
    • 1984-11-30
    • Fuji Boseki Kk
    • TOKURA SEIICHISEO HIROSHI
    • C02F1/28B01J20/26
    • PURPOSE: To increase the adsorption performance of heavy metals by coagulating an aq. acidic soln. dissolved with low mol. weight chitosan in a basic soln. to form the porous chitosan and crosslinking it with an organic diisocyanate compd.
      CONSTITUTION: An acidic soln. is produced by dissolving low mol. weight chitosan in an aq. soln. of the singleness or the mixture of acetic acid, dichloroacetic acid and formic acid. On the other hand, a basic soln. is produced by adding the basic substance such as sodium hydroxide and potassium hydroxide to water or alcohols having polarity to make this a coagulating soln. An acidic soln. of chitosan is dropped into the coagulating soln., coagulated and deposited to generate the porous granular material. Besides porous fiber may be made by spinning in the above-mentioned coagulating soln. The adsorbent of heavy metals is obtained by bringing the produced porous chitosan into contact with an organic diisocyanate compd. in the polar solvent and crosslinked to obtain an adsorbent of heavy metals.
      COPYRIGHT: (C)1986,JPO&Japio
    • 目的:通过凝结水提高重金属的吸附性能。 酸性溶胶 溶于低摩尔。 重量的壳聚糖在基本溶胶中。 形成多孔壳聚糖并用有机二异氰酸酯化合物进行交联。 构成:酸性溶胶。 通过溶解低摩尔来生产。 重量的壳聚糖在一个水平 索恩 的单一性或乙酸,二氯乙酸和甲酸的混合物。 另一方面,一个基本的soln。 通过将碱性物质如氢氧化钠和氢氧化钾加入到具有极性的水或醇以使其成为凝结溶液而制备。 酸性溶胶 的壳聚糖滴入凝结溶液中,凝结沉积以产生多孔颗粒材料。 除了多孔纤维之外,还可以通过在上述凝固溶胶中纺丝来制造。 通过使生产的多孔壳聚糖与有机二异氰酸酯化合物接触来获得重金属的吸附剂。 在极性溶剂中进行交联,得到重金属的吸附剂。
    • 6. 发明专利
    • Production of porous granular chitosan
    • 多孔颗粒生产
    • JPS6176504A
    • 1986-04-19
    • JP19807784
    • 1984-09-21
    • Fuji Boseki Kk
    • YABE HIROAKIKURAHASHI ITSUOKAWAMURA YOSHIHIDE
    • C12N11/02C07K17/10C08B37/08
    • PURPOSE: To obtain a chitosan suitable as a carrier of immobilized biocatalyst, etc., by dissolving a chitosan having low molecular weight in an acidic aqueous solution, adding the solution dropwise to a basic solution to obtain a granular porous chitosan, and crosslinking the chitosan with an organic diisocyanate compound.
      CONSTITUTION: A low molecular weight chitosan having a molecular weight of preferably 10,000W230,000 is dissolved in an acidic aqueous solution, and the obtained solution is added to a basic solution of e.g. NaOH, CaCO
      3 , etc. through a nozzle of 0.1W0.25m/m diameter to obtain a granular porous chitosan, which is crosslinked by contacting with an organic diisocyanate compound (e.g. 4,4'-diphenylmethane diisocyanate) in a polar solvent (e.g. methanol, acetone, etc.).
      EFFECT: The crosslinking treatment is effective to improve the resistance to acid and alkali and to ensure the restoration of the fine porosity by immersing the chitosan in water after the freezing or drying treatment.
      COPYRIGHT: (C)1986,JPO&Japio
    • 目的:为了获得适合作为固定化生物催化剂载体等的壳聚糖,通过将低分子量壳聚糖溶解在酸性水溶液中,将其滴加到碱性溶液中,得到颗粒状多孔壳聚糖,并将壳聚糖 与有机二异氰酸酯化合物。 组成:将分子量优选为10,000-230,000的低分子量壳聚糖溶解在酸性水溶液中,将所得溶液加入到例如乙酸乙酯的碱性溶液中。 NaOH,CaCO 3等通过0.1-0.25m / m直径的喷嘴获得颗粒状多孔壳聚糖,其通过在极性溶剂(例如4,4'-二苯基甲烷二异氰酸酯)中与有机二异氰酸酯化合物(例如4,4'-二苯基甲烷二异氰酸酯)接触而交联。 甲醇,丙酮等)。 效果:交联处理有效地提高了耐酸碱性,并且通过在冷冻或干燥处理后将壳聚糖浸入水中来确保细孔隙的恢复。