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 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 present invention relates to a porous base matrix having formyl group, which base matrix has a structure represented by the formula (2) as a spacer, which structure is obtained by cleaving a group represented by the formula (1): wherein, R 1 represents a group forming a five-membered ring or a six-membered ring with -CH (OH) -CH (OH) -; a method for producing the porous base matrix; and an adsorbent obtained by binding a ligand on the porous base matrix. By the present invention, a high-intensity base matrix for an adsorbent and an adsorbent are provided. The amount of a ligand leaked from the adsorbend is small.
Abstract:
The present invention relates to a method for producing a formyl group-containing porous base matrix, comprising the steps of introducing a spacer in a formyl group-containing porous particle; and then oxidizing the spacer with periodic acid and/or a periodate, to transform the part of the spacer into a formyl group; wherein the formyl group content in the porous particle after introduction of the spacer is not more than 3 µmol per 1 mL of the porous particle. Also, the present invention relates to a method for producing an adsorbent, comprising the step of immobilizing an amino group-containing ligand on the formyl group-containing porous base matrix. According to the present invention, a formyl-group containing porous base matrix and an adsorbent produced from the porous base matrix of which adsorption amount is high and which is has high strength and of which ligand is difficult to be leaked are provided.
Abstract:
The objective of the present invention is to provide to a method for easily producing high-performance porous cellulose beads having high mechanical strength. Also, the objective of the present invention is to provide an adsorbent produced from the high-performance porous cellulose beads. According to the present invention, high-performance porous cellulose beads can be easily produced from porous cellulose beads, and an adsorbent having high strength and high adsorption amount can be easily produced from the high-performance porous cellulose beads.
Abstract:
The objective of the present invention is to provide a method for easily and efficiently producing cellulose beads which have pore shape 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 crosslinking agent 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).