Adsorbent and manufacturing method therefor

Abstract

This invention provides an adsorbent for water treatment and a medical adsorbent that exhibit a high level of adsorptivity per unit volume and a high absorption rate. This invention also provides a medical adsorbent that can complete the adsorption of a contemplated material in a short time. The adsorbent is produced using a phenolic resin as a starting material and has a diameter of 0.02 to 10 m, a pore volume of 0.10 to 0.60 ml / g, a specific surface area of 800 to 3000 m<2> / g, and an average particle diameter of 0.1 to 0.8 mm. This adsorbent can be produced by providing a phenolic resin as a starting material, starting carbonization of the starting material at 350 to 550 DEG C, and raising the temperature to 700 to 950 DEG C at a temperature rise rate of 5 to 20 DEG C / min, and activating the carbide.

Description

technical field [0001] The invention relates to an adsorbent with extremely fast adsorption speed and large adsorption capacity per unit volume and a manufacturing method thereof. Specifically, it relates to an adsorbent suitable for water treatment and medical treatment, capable of effectively removing adsorption objects such as impurities with a short contact time, and a production method thereof. Background technique [0002] Since the adsorbent is usually filled into a device or equipment with a certain volume such as a column, an adsorption vessel, and an adsorption pool, the adsorption performance per unit weight must be high, and the adsorption performance per unit volume must also be high. . In addition, since the time of contacting the liquid (usually water) containing the substance to be adsorbed with the adsorbent is usually limited in the adsorption operation, if the adsorption rate is slow, it cannot be used as a practical adsorbent for the intended purpose. ...

AI Technical Summary

Problems solved by technology

In addition, since in the adsorption operation, the time for bringing the liquid (usually water) containing the substance to be adsorbed into contact with the adsorbent is usually limited, therefore, if the adsorption rate is slow, it cannot be used as a practical adsorbent for the intended purpose

[0003] In order to solve these problems, although reducing the particle size of the adsorbent particles has been considered, the smaller the particle size, the more the water flow resistance will be increased and the packing density will be reduced. Therefore, it is urgent to develop adsorbents with high adsorption performance per unit volume and fast adsorption speed.

[0004] Especially when the adsorbent is used for medical treatment, if the harmful adsorbent cannot be quickly adsorbed and removed in the digestive tract, the harmful substance will be absorbed in the body. Therefore, unless it is an adsorbent with a fast adsorption speed, it is difficult to achieve practical results.

[0005] For example, an adsorbent with a pore radius of 100 to 75,000 angstroms and a void of 0.1 to 1.0 ml / g obtained by activating petroleum pitch and a production method thereof (Patent Document 1) have been proposed, but it is recorded that the actually prepared adsorbent has a diameter of 80 An adsorbent rich in pores with smaller diameters with a pore volume of 0.70-0.75ml / g below angstrom (8nm) and a pore volume of 0.20-0.23ml / g with a diameter of 37.5-75000angstrom (3.75-7500nm) , the critical significance of the pore volume in the numerical definition is not clear, and does not affect the adsorption rate at all.

[0006] In addition, an adsorbent using petroleum pitch as a raw material with a pore diameter of 20 to 15000 nm and a pore volume of 0.04 ml / g to less than 0.10 ml / g has been proposed (Patent Document 2). The fine-pored adsorbent, and only mentions the selectivity of the adsorbed species in the equilibrium adsorption state, and does not involve the adsorption speed

[0007] Although there are literatures that use phenolic resin as the raw material, the pore volume is 0.04ml / g or 0.06ml / g, but this kind of sorbent is also rich in the adsorption of pores with small diameter. Regarding this kind of adsorbent, only the selectivity to the adsorbed substance in the equilibrium adsorption state is mentioned, and the adsorption speed is not involved at all.

[0008] In addition, although there is a document describing activated carbon with a pore diameter of 20 to 10,000 nm and a total pore volume of 0.04 ml / g or less (Patent Document 4), this document does not mention the adsorption rate of activated carbon at all. and