Abstract:
The objective of the present invention is to provide a convenient method for producing porous cellulose beads having high mechanical strength without using an auxiliary material which is5 highly toxic and corrosive and without a cumbersome and industrially adverse step. The method for producing porous cellulose beads according to the present invention is characterized in comprising the steps of mixing a cold alkaline aqueous solution and cellulose to prepare a cellulose dispersion and bringing the cellulose10 dispersion into contact with a coagulating solvent.
Abstract:
The purpose of the present invention is to provide a method for simply and easily producing porous cellulose beads having high mechanical strength without using a toxic and highly corrosive auxiliary starting material and without including a complicated process that is commercially disadvantageous. A method for producing porous cellulose beads of the present invention is characterized in that a cellulose dispersion liquid, which is obtained by mixing an alkaline aqueous solution at a low temperature with cellulose, is brought into contact with a coagulation solvent.
Abstract:
The present invention provides a method for easily and efficiently producing cellulose beads which has narrow pore size distribution and pore structure suitable for an adsorbent and of which adsorption performance is excellent without using highly toxic and highly corrosive auxiliary raw material and without industrially disadvantageous cumbersome step. The method for producing porous cellulose beads according to the present invention is characterized in comprising (a) the step of preparing a fine cellulose dispersion by mixing a low temperature alkaline aqueous solution and cellulose, (b) the step of preparing a mixed liquid by adding a water-soluble low molecular organic compound to the fine cellulose dispersion, (c) the step of preparing an emulsion by dispersing the mixed liquid in a dispersion medium, (d) the step of contacting the emulsion with a coagulating solvent.
Abstract:
A process for producing porous cellulose beads of the present invention is characterized by comprising the steps of: a) mixing an alkali aqueous solution and cellulose to prepare cellulose micro dispersion at low temperature, b) adding water to the cellulose micro dispersion to prepare cellulose slurry, and d) bringing the cellulose slurry into contact with coagulation solvent. A carrier for ligand immobilization of the present invention is characterized by being by shrinking polysaccharide porous beads not less than 10% by a shrinkage rate defined by the following formula, and crosslinking the polysaccharide porous beads: Shrinkage rate % = 1 ˆ’ V 2 / V 1 × 100 (wherein, V 1 indicates the gel volume of polysaccharide porous beads before shrinkage, and V 2 indicates the gel volume of polysaccharide porous beads after shrinkage).
Abstract:
PROBLEM TO BE SOLVED: To provide a method of safely and simply manufacturing a porous cellulose film which can be utilized as an adsorbent of various substances without using a solvent with high toxicity, such as calcium thiocyanate, wherein the method controls the shape, the membranous thickness, and the shape of a hole.SOLUTION: The method of manufacturing a cellulose porous film is characterized as follows. A solution containing cellulose and an ion liquid is solidified by bringing the solution into contact with a cellulose undissolved liquid. The ion liquid which can be separated/recovered is used, thereby manufacturing a cellulose porous film more safely, at lower cost, and with outstanding productive efficiency. The kind and composition of a cellulose undissolved solvent, the shape of a mold to be used, and the injection rate of a cellulose solution to a mold are altered, thereby changing the shape, thickness, and pore diameter of a cellulose porous film. The cellulose porous film can be utilized as an adsorbent of various substances.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for safely and simply forming porous cellulose particles, which are usable as adsorbents for various materials, with a small amount of solvent without using liquid-liquid dispersion and for varying an operation parameter for formation of the cellulose particles over a wide range.SOLUTION: In the method for producing cellulose porous particles, the cellulose porous particles are formed when a solution including cellulose and an ionic liquid is turned into droplets in gas, and then, brought into contact with a cellulose-insoluble solvent to be solidified. The cellulose porous particles produced by this method can be suitably used as adsorbents for various materials.