JP6768849B2 - Suction / desorption method and suction / desorption device - Google Patents

Description

The present invention relates to a suction / desorption method and a suction / desorption device. More specifically, the present invention relates to an adsorption / desorption method having high adsorption and desorption efficiency in a liquid phase, and an adsorption / desorption device for carrying out the method. The present application claims priority to Japanese Patent Application No. 2017-22572 filed on February 9, 2017, the contents of which are incorporated herein by reference.

Various liquid phase adsorption methods have been conventionally known. For example, in Patent Document 1, a wastewater containing fluorine and / or phosphoric acid is passed through a reaction vessel filled with a fluorine or phosphoric acid adsorbent, and the wastewater is adsorbed in the reaction vessel to adsorb fluorine and / or phosphoric acid. / Or an adsorption step that produces water with reduced phosphoric acid, a regeneration step in which the regenerant is cyclically passed through a reaction vessel filled with a fluorine or phosphoric acid adsorbent after the adsorption step, and after the regeneration step. In a method for regenerating a fluorine or phosphoric acid adsorbent, which comprises an activation step of passing an activator through a reaction vessel filled with a fluorine or phosphoric acid adsorbent, the liquid is passed through the adsorption step and / the activation step. Disclosed is a method for regenerating the fluorine or phosphoric acid adsorbent, which is carried out in the form of a fluidized bed in an upward flow.

Patent Document 2 includes an adsorbent, an adsorbent container movably containing particles of the adsorbent, and a transport means for flowing a fluid into the adsorbent so that the adsorbent flows. Discloses an adsorption device in which the shape of the bottom of the container is a cone or the cross-sectional area of the bottom of the container is smaller than the cross-sectional area of the bottom of the container.

Non-Patent Document 1 discloses a repeated experiment of adsorption / desorption by a fluidized bed. Non-Patent Document 1 states that the experiment was specifically carried out as follows. The adsorbent carrying pectic acid on zirconium was swollen and filled in the reactor. Phosphorus-containing wastewater adjusted to pH 2.0 was passed through a reactor for adsorption. Then, only the liquid in the reactor was withdrawn. Next, 0.2M NaOH was passed through the reactor for desorption. Then, only the liquid in the reactor was withdrawn. The adsorbent was conditioned, and adsorption and desorption were repeated again.

Non-Patent Document 2 states that when activated carbon having a particle size distribution is used, the efficiency of the fluidized bed method is significantly improved as compared with the case where activated carbon having a uniform particle size is used.

Japanese Unexamined Patent Publication No. 2005-144370 JP-A-9-299735

Hiroyuki Harada et al. "Method of recovering phosphorus by effectively utilizing mandarin orange juice residue" 2008-2009 Recycling-oriented Society Formation Promotion Scientific Research Grant Project Comprehensive Research Report pp38-39 Akira Yuasa et al. "Efficiency Comparison Experiment of Fixed Bed Adsorption and Fluidized Bed Adsorption Using Activated Carbon with Particle Size Distribution" Proceedings of the Chubu Branch Research Presentation of the Society of Civil Engineers, 1987, pp. 214-215

An object of the present invention is to provide an adsorption / desorption method having high efficiency of adsorption and desorption in a liquid phase, and an adsorption / desorption device for carrying out the method.

As a result of diligent studies to solve the above problems, the present invention including the following forms has been completed.

That is, the present invention is as follows.

[1] In a container in which a granular adsorbent is contained in a fluid state and at least a lower portion has a portion in which the cross-sectional area of the lumen gradually increases from the bottom to the top.
An adsorption step in which a liquid containing a substance to be adsorbed is supplied to the bottom of the container, and the liquid is allowed to flow upward in the cavity of the container to allow at least a part of the granular adsorbent to flow while adsorbing the substance to be adsorbed on the granular adsorbent.
The process of stopping the supply of the liquid containing the substance to be adsorbed and then discharging the liquid accumulated in the container cavity from the bottom of the container.
The desorption step of supplying the liquid for desorbing the substance to be adsorbed from the granular adsorbent to the container to desorb the substance to be adsorbed from the granular adsorbent, and the supply of the liquid for desorbing the substance to be adsorbed from the granular adsorbent are stopped. Then, the process of discharging the liquid accumulated in the container cavity from the bottom of the container,
Including, suction and desorption method.

[2] The suction / desorption method according to [1], further comprising a regeneration step of supplying a regeneration liquid to a container to regenerate the adsorption activity of the granular adsorbent.
[3] The desorption process
A liquid for desorbing the substance to be adsorbed from the granular adsorbent is supplied to the bottom of the container, and the liquid is flowed upward in the cavity of the container to flow at least a part of the granular adsorbent while adsorbing the substance to be adsorbed from the granular adsorbent. The adsorption / desorption method according to [1] or [2], which comprises desorption.
[4] The regeneration process
2. The method according to [2], wherein the regenerated liquid is supplied to the bottom of the container, and the regenerated liquid is allowed to flow upward in the container cavity to regenerate the adsorption activity of the granular adsorbent while flowing at least a part of the granular adsorbent. Adsorption / detachment method.
[5] Any of [1] to [4], wherein the granular adsorbent has a 50% diameter of 10 to 2000 μm and a ratio of 90% diameter to 10% diameter of 1.8 or more in the volume-based cumulative particle size distribution. The suction / detachment method described in one.
[6] The adsorption / desorption method according to any one of [1] to [5], wherein the granular adsorbent has a true density of 2 to 5 g / cm ³ .

[7] A container that can accommodate a granular adsorbent in a fluid state and has a portion at least in the lower portion that gradually increases as the cross-sectional area of the lumen increases from the bottom to the top;
First supply pipe for supplying the liquid containing the substance to be adsorbed to the container;
A second supply pipe for supplying the container with a liquid or a regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent;
First discharge pipe for discharging liquid from the container;
A second discharge pipe for discharging the liquid from the container; and a liquid containing the substance to be adsorbed is supplied to the container through the first supply pipe, and the liquid containing the substance to be adsorbed is flowed upward in the cavity of the container. Adsorption mode in which the substance to be adsorbed is adsorbed on the granular adsorbent while flowing at least a part of the granular adsorbent, and the liquid is discharged from the first discharge pipe.
The first extraction mode, in which the supply of the liquid containing the substance to be adsorbed is stopped through the first supply pipe and the liquid is discharged from the container through the second discharge pipe.
A liquid or a regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent is supplied to the container via the second supply pipe, the substance to be adsorbed is desorbed from the granular adsorbent, and the substance to be adsorbed is desorbed from the first discharge pipe or the second discharge pipe. Desorption mode for discharging the liquid, and stopping the supply of the liquid or the regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent via the second supply pipe, and discharging the liquid from the container through the second discharge pipe. (Ii) Having a control means for performing the extraction mode,
Adsorption device.

[8] The suction / detachment device according to [7], wherein the installation position of the first supply pipe is the bottom of the container.
[9] The suction / desorption device according to [7], wherein the installation position of the first discharge pipe is above the portion of the container in which the cross-sectional area of the lumen gradually increases from the bottom to the top.
[10] The suction / desorption device according to [7], wherein the installation position of the second supply pipe is above the portion of the container in which the cross-sectional area of the lumen gradually increases from the bottom to the top.
[11] The suction / detachment device according to [7], wherein the installation position of the second supply pipe is the bottom of the container.
[12] The suction / detachment device according to [7], wherein the installation position of the second discharge pipe is the bottom of the container.
[13] The suction / desorption device according to [7], wherein the horizontal cross section of each part of the lumen is circular.
[14] The portion where the cross-sectional area of the lumen gradually increases from the bottom to the top has an inclination angle of 30 to 85 ° and a height of 40 to 100% of the total height of the container, [7] to [13]. ] The suction / detachment device according to any one of.
[15] Any of [7] to [14], wherein the granular adsorbent has a 50% diameter of 10 to 2000 μm and a ratio of 90% diameter to 10% diameter of 1.8 or more in the volume-based cumulative particle size distribution. The suction / detachment device described in one.
[16] The suction / desorption device according to any one of [7] to [15], wherein the granular adsorbent has a true density of 2 to 5 g / cm ³ .

The adsorption / desorption method and the adsorption / desorption device of the present invention have high efficiency of adsorption and desorption in the liquid phase. In particular, the efficiency of adsorption and desorption is high when an adsorbent having a high true density and a wide particle size distribution is used.

It is a figure which shows an example of the suction / detaching apparatus of this invention. It is a figure which shows an example of the container used for the suction / detaching apparatus of this invention.

An embodiment of the present invention will be described with reference to the drawings.
The suction / detachment device of the present invention includes a container 2, a first supply pipe 3, a second supply pipe 4a, 4b, a first discharge pipe 5, a second discharge pipe 6, and a control means.

The container 2 has a portion at least in the lower portion where the cross-sectional area of the lumen gradually increases from the bottom to the top. The inclination angle in this portion may be constant, or may change continuously or discontinuously in the vertical direction. The horizontal cross section of each portion of the cavity of the container 2 is preferably circular. It preferably has a portion having an inverted conical shape or a vertical inverted conical shape at the lower part. The portion forming this (head) inverted conical shape may be a single portion (that is, the inclination angle is constant), but a plurality of (head) reverses as shown in the container 21 of FIG. Conical shapes (with different tilt angles) may be continuous up and down.

The height of the portion where the cross-sectional area of the lumen gradually increases from the bottom to the top is preferably 40 to 100% of the total height of the container 2. The inclination angle of the portion where the cross-sectional area of the lumen gradually increases from the bottom to the top is preferably larger than the angle of repose of the granular adsorbent in the resting liquid, and particularly preferably 30 to 85 °.

It is preferable that the portion other than the portion where the cross-sectional area of the lumen gradually increases from the bottom to the top has a cylindrical shape.

Prevents the granular adsorbent from falling into the first supply pipe 3 and / or the second discharge pipe 6 at the bottom of the container or in the vicinity of the container installation site in the first supply pipe 3 and / or the second discharge pipe 6. It is preferable to install a filter for this purpose.

The container 2 can contain the granular adsorbent in a fluid state. The granular adsorbent flows when a liquid containing the substance to be adsorbed (hereinafter referred to as the first liquid) is supplied to form a fluidized bed.
In the part where the cross-sectional area of the lumen gradually increases from the bottom to the top, the flow velocity of the first liquid has a gradient that is inversely proportional to the cross-sectional area, so that the granular adsorbent has a large particle size at the bottom. Those with a small particle size are classified at the top. Therefore, most of the substances to be adsorbed are adsorbed on the large-grained granular adsorbent, and then the rest are adsorbed on the small-particle-sized granular adsorbent showing a high adsorption rate, resulting in high adsorption efficiency. ..

The granular adsorbent is not particularly limited as long as it can absorb and desorb the substance to be adsorbed. For example, activated carbon, silica gel, activated alumina, silica-alumina, zeolite; adsorbent composed of oxides of metals such as iron and zirconium, hydroxides or oxide hydroxides; adsorbents described in Non-Patent Document 1 and the like. be able to. The granular adsorbent used in the present invention may be one in which an adsorption active ingredient is supported on a solid carrier, one in which an adsorption active ingredient is contained, or the like.

The granular adsorbent has a true density of preferably 2 to 5 g / cm ³ , more preferably ³ to 4 g / cm ³ . The larger the difference between the true density of the granular adsorbent and the first liquid, the greater the above-mentioned classification effect, but it is preferable to set the true density within the above range in order to easily form a fluidized bed.

The granular adsorbent has a 50% diameter of preferably 10 to 2000 μm, more preferably 50 to 500 μm in the volume-based cumulative particle size distribution. In the volume-based cumulative particle size distribution, the ratio of the 90% diameter to the 10% diameter of the granular adsorbent is preferably 1.8 or more, more preferably 1.8 to 5. According to the present invention, it is possible to use an adsorbent made of an inorganic adsorption active component, which is difficult to produce with uniform particle size, with high efficiency.

The first supply pipe is for supplying the first liquid to the container. In the apparatus shown in FIG. 1, the first supply pipe 3 is installed at the bottom of the container. The first liquid may further contain solid suspended matter as long as it does not interfere with the effects of the present invention. Examples of substances to be adsorbed include phosphorus-containing substances such as phosphoric acid and phosphorous acid; halogen-containing substances such as chlorine and halogenated hydrocarbons; sulfur-containing substances such as sulfuric acid and sulfite; nitrogen-containing substances such as ammonia and amines. be able to. In the present invention, the first liquid is supplied to the bottom of the container via the first supply pipe 3, and the liquid is allowed to flow upward in the container cavity to allow at least a part of the granular adsorbent to flow while adsorbing the substance to be adsorbed. Performs an adsorption step of adsorbing to a granular adsorbent. In this step, it is preferable that 80% by mass or more of the granular adsorbent is flowing. Further, it is preferable that all of the granular adsorbent is flowing without being in a continuous precipitation state. The flow rate of the liquid supplied via the first supply pipe 3 is not particularly limited as long as the granular adsorbent forms a fluidized bed. The liquid adsorbed by the granular adsorbent is discharged from the container 2 through the first discharge pipe 5.

The first discharge pipe 5 is preferably installed at the top of the container as shown in FIG. 1, but this is not essential and at least the cross-sectional area of the lumen gradually increases from bottom to top. It suffices if it is installed above the part. Since the granular adsorbent forms a fluidized bed below the first discharge pipe 5, the granular adsorbent having the minimum particle size required for the adsorption / desorption method of the present invention is placed below the first discharge pipe 5. Preferably, the shape of the container and the installation site of the first discharge pipe 5 may be designed so that a fluidized bed is formed in a portion where the cross-sectional area of the lumen gradually increases from the bottom to the top. As a result, unnecessary fine particles derived from the adsorbent are discharged through the first discharge pipe 5 together with suspended matter which may be contained in the first liquid.

The second discharge pipe 6 is for discharging the liquid from the container. In the device shown in FIG. 1, the second discharge pipe 6 is installed at the bottom of the container. In the above-mentioned adsorption step, the concentration of the substance to be adsorbed in the liquid flowing through the first discharge pipe 5 is measured. When the measured value exceeds a predetermined value, for example, when the measured value approaches the concentration of the substance to be adsorbed in the liquid containing the substance to be adsorbed supplied from the first supply pipe 3. It means that the amount of the substance to be adsorbed by the granular adsorbent is close to the saturated adsorption amount. Therefore, in the present invention, the supply of the first liquid from the first supply pipe 3 is stopped, and then the liquid accumulated in the container cavity is discharged from the bottom of the container via the second discharge pipe 6. Since the discharged liquid has a composition ratio similar to that of the liquid supplied via the first supply pipe 3, when the adsorption process is restarted, the discharged liquid is supplied again via the first supply pipe 3. be able to.

When the liquid accumulated in the container cavity is discharged via the second discharge pipe 6, the granular adsorbent settles on the bottom of the container, but prior to that, the granular adsorbent is classified in the container as described above. Since the granular adsorbent having a small particle size settles in the upper portion having a large cross-sectional area, it has an effect of reducing the pressure loss.

The second supply pipes 4a and 4b are for supplying a liquid or a regenerated liquid (hereinafter, referred to as a second liquid when both are included) to the container for desorbing the substance to be adsorbed from the granular adsorbent. The second supply pipe is installed at an arbitrary position in the container, for example, at the top, side or bottom of the container. The installation position of the second supply pipe is preferably above the portion where the cross-sectional area of the lumen gradually increases from the bottom to the top, and more preferably at the top. The regenerated liquid means a liquid for regenerating the adsorption activity of the granular adsorbent.

The second supply pipe 4b is installed at the bottom of the container. The second supply pipe 4a is installed at the top of the container. Although the device of FIG. 1 is drawn so that both the second supply pipe 4a and the second supply pipe 4b are installed, the device of the present invention is such that only one of them is installed. There may be.

When the second supply pipe 4b is installed, for example, a liquid for desorbing the substance to be adsorbed is supplied to the bottom of the container via the second supply pipe 4b, and the liquid is allowed to flow upward in the container cavity to be granular. A desorption step of desorbing the substance to be adsorbed from the granular adsorbent can be performed while flowing at least a part of the adsorbent. In this step, it is preferable that 80% by mass or more of the granular adsorbent is flowing. Further, it is preferable that all of the granular adsorbent is flowing without being in a continuous precipitation state. The flow rate of the liquid supplied via the second supply pipe 4b is not particularly limited as long as the granular adsorbent forms a fluidized bed. The desorbed liquid is discharged from the container 2 through the first discharge pipe 5. The desorbed liquid contains substances to be adsorbed.

Further, if necessary, the liquid discharged through the first discharge pipe 5 may be supplied to the second supply pipe 4b and circulated. As a specific method for that purpose, the first discharge pipe 5 and the second supply pipe 4b are connected, and the liquid discharged through the first discharge pipe 5 is directly supplied to the second supply pipe 4b and circulated for a certain period of time. A method of repeating the step of storing the liquid discharged through the first discharge pipe 5 in the tank and then supplying the liquid from the tank to the second supply pipe 4b a certain number of times; and the like are exemplified. Will be done. In this case, when the concentration of the substance to be adsorbed in the liquid flowing through the first discharge pipe 5 reaches a predetermined value, the circulation is stopped and the liquid flowing through the first discharge pipe 5 is collected.

In the above-mentioned desorption step, the concentration of the substance to be adsorbed in the liquid flowing through the first discharge pipe 5 is measured. When the measured value falls below a predetermined value, for example, when the measured value approaches zero, the amount of the substance to be adsorbed that can be desorbed from the granular adsorbent is approaching zero. Means that. Therefore, in the present invention, the supply of the liquid for desorbing the substance to be adsorbed from the second supply pipe 4b is stopped, and then the liquid accumulated in the container cavity is discharged from the bottom of the container via the second discharge pipe 6.

When the second supply pipe 4a is installed, for example, a liquid for desorbing the substance to be adsorbed is supplied to the top of the container via the second supply pipe 4a, and the liquid is stored in the container cavity to be the substance to be adsorbed. Can be desorbed from the granular adsorbent. The liquid for desorbing the substance to be adsorbed supplied via the second supply pipe 4a may be stopped (1) when the granular adsorbent in the container cavity is completely immersed in the liquid. Then, (2) the supply may be stopped when the container cavity is completely filled, or (3) the second discharge pipe 6 to the second supply pipe may be stopped even after the container cavity is completely filled. The supply may be continued while discharging in an amount commensurate with the supply amount via 4a. In (3), the liquid discharged through (4) second discharge pipe 6 may be further supplied to the second supply pipe 4a and circulated. As a specific method for that purpose, the second discharge pipe 6 and the second supply pipe 4a are connected, and the liquid discharged through the second discharge pipe 6 is directly supplied to the second supply pipe 4a and circulated for a certain period of time. A method of repeating the step of storing the liquid discharged through the second discharge pipe 6 in the tank and then supplying the liquid from the tank to the second supply pipe 4a a certain number of times; and the like are exemplified. Will be done. When the desorption is performed according to (1) or (2), the desorbed liquid is discharged from the container 2 through the second discharge pipe 6. When desorption is performed according to (3), the concentration of the substance to be adsorbed in the liquid flowing through the second discharge pipe 6 is measured. When the measured value falls below a predetermined value, for example, when the measured value approaches zero, the amount of the substance to be adsorbed that can be desorbed from the granular adsorbent is approaching zero. Means that. Therefore, in the present invention, the supply of the liquid for desorbing the substance to be adsorbed from the second supply pipe 4a is stopped, and then the liquid accumulated in the container cavity is discharged from the bottom of the container via the second discharge pipe 6. In the case of desorption according to (4), when the concentration of the substance to be adsorbed in the liquid flowing through the second discharge pipe 6 reaches a predetermined value, the circulation is stopped and the liquid flowing through the second discharge pipe 6 is collected. .. The desorbed liquid contains substances to be adsorbed.

When the above adsorption and desorption are repeated a plurality of times, the saturated adsorption amount of the granular adsorbent decreases, and the amount of the substance to be adsorbed that can be desorbed from the granular adsorbent decreases. When such a state occurs, the granular adsorbent can be regenerated. In addition, depending on the type of granular adsorbent and the substance to be adsorbed, regeneration may be essential for reuse after desorption. For example, the regenerated liquid is supplied to the bottom of the container via the second supply pipe 4b, and the regenerated liquid is allowed to flow upward in the container cavity to allow at least a part of the granular adsorbent to flow while adsorbing the granular adsorbent. It can be regenerated. In this case, it is preferable that 80% by mass or more of the granular adsorbent is flowing. Further, it is preferable that all of the granular adsorbent is flowing without being in a continuous precipitation state. Further, the regenerated liquid can be supplied to the top of the container via the second supply pipe 4a, and the regenerated liquid can be stored in the container cavity to regenerate the adsorption activity of the granular adsorbent.

The above suction step, discharge step, desorption step, and regeneration step can be switched by manually or automatically operating the valves (v1 to v5) and the pump. The suction / detachment device of the present invention has a control means for automatically operating a valve, a pump, or the like. The control means may include means for measuring the concentration of the substance to be adsorbed, means for comparing the measured value with a predetermined value, and the like. By the control means, the first liquid is supplied to the container through the first supply pipe, and the first liquid is allowed to flow upward in the container cavity to allow at least a part of the granular adsorbent to flow while adsorbing the substance to be adsorbed. Adsorption mode in which the liquid is adsorbed on the material and discharged from the first discharge pipe, first extraction mode in which the supply of the first liquid is stopped via the first supply pipe and the liquid is discharged from the container via the second discharge pipe. , A desorption mode in which the second liquid is supplied to the container via the second supply pipe, the substance to be adsorbed is desorbed from the granular adsorbent, and the liquid is discharged from the first discharge pipe or the second discharge pipe, and the second supply pipe. It is possible to perform a second extraction mode in which the supply of the second liquid is stopped and the liquid is discharged from the container through the second discharge pipe. In the adsorption mode, it is preferable that 80% by mass or more of the granular adsorbent is flowing. Further, it is preferable that all of the granular adsorbent is flowing without being in a continuous precipitation state. In particular, it is preferable to sequentially perform each of the above modes in the above order. Further, the control means can supply the regenerated liquid to the container via the second supply pipe as needed to perform a regenerated mode for regenerating the granular adsorbent.

1: Suction / desorption device 2: Container 21: Container 3: First supply pipe 4a, 4b: Second supply pipe 5: First discharge pipe 6: Second discharge pipe
v1, v2, v3, v4, v5: Valve θ, θ1, θ2: Inclined angle of the container

Claims (10)

In a container in which the granular adsorbent is contained in a fluid state and at least the lower portion has a portion in which the cross-sectional area of the cavity gradually increases from the bottom to the top.
An adsorption step in which a liquid containing the substance to be adsorbed is supplied to the bottom of the container, and the liquid is allowed to flow upward in the cavity of the container to adsorb the substance to be adsorbed to the granular adsorbent while flowing 80% by mass or more of the granular adsorbent.
The process of stopping the supply of the liquid containing the substance to be adsorbed and then discharging the liquid accumulated in the container cavity from the bottom of the container.
The desorption step of supplying the liquid for desorbing the substance to be adsorbed from the granular adsorbent to the container to desorb the substance to be adsorbed from the granular adsorbent, and the supply of the liquid for desorbing the substance to be adsorbed from the granular adsorbent are stopped. Then, the process of discharging the liquid accumulated in the container cavity from the bottom of the container,
The including, an adsorption-desorption method,
The granular adsorbent has a true density of 2 to 5 g / cm ³ , a 50% diameter of 10 to 2000 μm and a ratio of 90% diameter to 10% diameter of 1.8 or more in the volume-based cumulative particle size distribution.
The portion of the vessel that gradually increases as the cross-sectional area of the lumen increases from bottom to top has an inclination angle of 30-85 ° and a height of 40-100% of the total height of the vessel.
Attachment / detachment method. The adsorption / desorption method according to claim 1, wherein in the adsorption step, the substance to be adsorbed is adsorbed on the granular adsorbent while flowing all of the granular adsorbent without being in a continuous precipitation state. The suction / desorption method according to claim 1 or 2 , further comprising a regeneration step of supplying a regeneration liquid to a container to regenerate the adsorption activity of the granular adsorbent. The desorption process is
A liquid for desorbing the substance to be adsorbed from the granular adsorbent is supplied to the bottom of the container, and the liquid is flowed upward in the cavity of the container to flow at least a part of the granular adsorbent while adsorbing the substance to be adsorbed from the granular adsorbent. The suction / desorption method according to any one of claims 1 to 3 , which comprises desorption. The regeneration process
The third aspect of claim 3 , wherein the regenerated liquid is supplied to the bottom of the container, and the regenerated liquid is allowed to flow upward in the container cavity to regenerate the adsorption activity of the granular adsorbent while flowing at least a part of the granular adsorbent. Adsorption / desorption method. A container that can accommodate a granular adsorbent in a fluid state and has a portion at least at the bottom that gradually increases as the cross-sectional area of the lumen increases from bottom to top;
The first supply pipe installed at the bottom of the container for supplying the liquid containing the substance to be adsorbed to the container;
A second supply pipe for supplying the container with a liquid or a regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent;
A first discharge pipe for draining liquid from the container , which is installed above the portion of the container where the cross-sectional area of the cavity gradually increases from bottom to top ;
A second discharge pipe installed at the bottom of the container for discharging the liquid from the container; and a liquid containing the substance to be adsorbed to the container via the first supply pipe, and the liquid to be adsorbed upward in the container cavity. Adsorption mode in which the substance to be adsorbed is adsorbed on the granular adsorbent while flowing 80% by mass or more of the granular adsorbent by flowing a liquid containing the substance, and the liquid is discharged from the first discharge pipe.
The first extraction mode, in which the supply of the liquid containing the substance to be adsorbed is stopped through the first supply pipe and the liquid is discharged from the container through the second discharge pipe.
A liquid or a regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent is supplied to the container via the second supply pipe, the substance to be adsorbed is desorbed from the granular adsorbent, and the substance to be adsorbed is desorbed from the first discharge pipe or the second discharge pipe. Desorption mode for discharging the liquid, and stopping the supply of the liquid or the regenerated liquid for desorbing the substance to be adsorbed from the granular adsorbent via the second supply pipe, and discharging the liquid from the container through the second discharge pipe. (Ii) A suction / detachment device having a control means for performing the extraction mode .
The granular adsorbent has a true density of 2 to 5 g / cm ³ , a 50% diameter of 10 to 2000 μm and a ratio of 90% diameter to 10% diameter of 1.8 or more in the volume-based cumulative particle size distribution.
The portion of the vessel that gradually increases as the cross-sectional area of the lumen increases from bottom to top has an inclination angle of 30-85 ° and a height of 40-100% of the total height of the vessel.
Adsorption device. The suction / desorption device according to claim 6, wherein in the adsorption mode, the substance to be adsorbed is adsorbed on the granular adsorbent while flowing all of the granular adsorbent without being in a continuous precipitation state. The suction / desorption device according to claim 6 or 7 , wherein the installation position of the second supply pipe is above the portion of the container in which the cross-sectional area of the lumen gradually increases from the bottom to the top. The suction / detachment device according to claim 6 or 7 , wherein the installation position of the second supply pipe is the bottom of the container. The suction / desorption device according to claim 6 , wherein the horizontal cross section of each part of the lumen is circular.

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