JPH07112102A - Gas-liquid separator - Google Patents

Abstract

PURPOSE:To provide a gas-liquid separator capable of separating gas-liquid without being affected by the boiling point of a solute with high gas-liquid separation accuracy and unnecessitating high energy cost and excellent in space saving property without generating noise and vibration. CONSTITUTION:Plural pores 17 are formed in the tube wall of a porous tubular body 12 over the whole area of the body, and also a layer 18 deposited with manganese dioxide is formed on the inner wall over the whole area of the body. The porous tubular body 12 is filled with a manganese dioxide carrying body 19 which has been pulverized to granular powder of about 1mm diameter so as to occupy about 50% of the inner space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid separation device for generating a gas from a liquid to be treated or its solute by a chemical reaction and recovering the liquid after removing the gas.

[0002]

2. Description of the Related Art Conventionally, many devices for physically or chemically separating and removing dissolved substances contained in a liquid to be treated have been proposed. For example, as a device for physically separating and removing a dissolved substance from a liquid to be treated, a filtration and separation device using activated carbon, a hollow fiber or the like to remove chlorine and other impurities contained in tap water is well known. ing. Such a filtration / separation device is characterized in that it is filtered and separated in a state where chlorine is dissolved in an aqueous solution.
If it is sent to a separation device, water as a treatment liquid can be obtained.

However, in this type of filtration and separation device, it is necessary to replace the activated carbon and the hollow cotton thread periodically,
There was a problem that the cost was high in the long term. In addition, there is a problem in that it is impossible to take out and utilize the components to be filtered and the components to be separated. Therefore, without using a filter medium,
Many gas-liquid separation devices have been proposed which separate a liquid to be treated into a specific gas component and a residual solution component by generating a gas component from the liquid to be treated.

For example, as a first means for generating a gas component from a liquid to be treated, the container containing the liquid to be treated is depressurized by a vacuum pump and placed under a pressure condition lower than the saturated vapor pressure of the gas component. There is known a gas-liquid separation device that separates a gas component and a liquid component by realizing a state in which a gas component in a liquid to be treated is easily evaporated. As a second means, the liquid to be treated is brought into contact with the solvent through the semipermeable membrane so that the solute (gas component) in the liquid to be treated is diffused and dissolved in the solvent to dissolve the solute (gas) in the liquid to be treated. There is known a gas-liquid separator in which components are removed to leave only a solvent.

Further, as a third means, there is known a gas-liquid separation device for heating a liquid to be treated to reduce the solubility of a solute (gas component) contained in the liquid to be vaporized and separating the gas component. Has been. As a fourth means, the difference between the boiling point of the solute (gas component) and the boiling point of the solvent (liquid component) in the liquid to be treated is utilized to distill the liquid to be treated to volatilize and separate the solvent and the solute. There is known a gas-liquid separation device that vaporizes and separates.

Further, as a fifth means, the liquid to be treated is filled in a catalyst tank which is open to the atmosphere and stirred to promote gas-liquid separation, and then left standing to take out only the solvent from below. The device is known.

[0007]

However, the conventional gas-liquid separator has the following problems. That is, a gas-liquid separator that separates gas and liquid by placing the liquid under treatment under reduced pressure is a solute (gas component) at room temperature even when used for a liquid containing a solute having a high boiling point.
However, there is a problem in that it is not possible to promote the evaporation of the above, and it is limited to use for a liquid to be treated containing a solute having a low boiling point. Further, since it is necessary to equip a vacuum pump and the like as a part of the apparatus, the apparatus becomes large, and when the solute in the liquid to be treated is a corrosive gas, the vacuum pump and the like are corroded and the gas-liquid separator May significantly shorten the product life of
Further, there is a problem that noise and vibration are generated with the operation of the vacuum pump and the like.

Further, in a gas-liquid separation apparatus for removing solute from a liquid to be treated by using a membrane such as a semipermeable membrane, the gas-liquid separation treatment time depends on the diffusion time (diffusion rate) of the solute in the solvent. However, there is a problem that it takes a long time to complete the gas-liquid separation. This problem is usually due to the slow diffusion rate of the solute into the solvent, but since the diffusion rate is a physical property value that arises from the mutual relationship between the solvent and the solute, it is not possible to accelerate this dramatically. It is difficult, and it is necessary to increase the absolute diffusion amount by increasing the contact area between the solvent and the solute, which causes a problem that the device becomes large.

Furthermore, in a gas-liquid separator for simply heating a liquid to be treated to separate a gas component and a liquid component, it is extremely difficult to separate and collect fine bubbles from the liquid component which appear in the liquid to be treated by heating. Therefore, there is a problem in that the separation accuracy is extremely poor unless some sort of recovery means is provided separately. Further, in the gas-liquid separation device that separates the liquid to be treated into a solute and a solution by distillation, a heating device is required to evaporate a desired gas component in the liquid to be treated, resulting in an extremely high energy cost. , A distillation apparatus such as a distillation column must be installed, and the entire apparatus is significantly enlarged,
There was also the problem of increased equipment costs.

Further, in the gas-liquid separation device using the catalyst tank, the gas-liquid separation operation is a continuous operation because it is a batch process that waits until the gas component in the liquid to be treated is released into the atmosphere. However, there is a problem that the processing capacity is poor. In addition, even if the solvent is taken out from the lower layer of the catalyst tank without easily degassing the fine bubbles generated by decomposition, it is difficult to separate it from the solvent, and the gas-liquid separation accuracy is poor. .

The present invention has been made in order to solve the above problems, and it is possible to perform gas-liquid separation without being influenced by the boiling point of a solute, and it is possible to perform gas-liquid separation having a high gas-liquid separation and purification capability. It is also an object of the present invention to provide a gas-liquid separation device that does not require high energy cost, does not generate noise and vibration, and is excellent in space saving.

[0012]

In order to achieve this object, a gas-liquid separation device according to the present invention is provided in a space partitioned by a porous wall through which liquid can pass, and is fed to the space. A chemical reaction medium that chemically reacts with the treatment liquid to generate gas is provided, and the separated liquid after removing the gas generated by the chemical reaction medium is extracted and separated through the porous wall. It is the gist of the invention. Examples of the chemical reaction medium used at this time include catalysts and enzymes.

In this case, the porous wall for partitioning the space is composed of a porous tube body, a chemical reaction medium is provided in the porous tube body, and a chemical reaction is caused from a liquid to be treated fed in the porous tube body. The separated liquid excluding the gas generated by the medium is configured to be extracted to the outside of the porous tubular body through the porous wall of the porous tubular body, or around the porous tubular body having the porous wall. The chemical reaction medium is provided in the inside of the porous tubular body, and the separated liquid obtained by removing the gas generated by the chemical reaction medium from the liquid to be treated flowing around the porous tubular body passes through the porous wall of the porous tubular body. It is preferable to configure so as to be extracted into. Further, it is desirable that the space is held at a pressure lower than the bubble point pressure of the porous wall partitioning the space.

[0014]

According to the gas-liquid separation device of the present invention having the above-mentioned structure, the liquid to be treated which has been fed to the space partitioned by the porous wall having the permeable space is provided in the space. A gas is generated by the chemical reaction with the chemical reaction medium in which the gas is present.

Since the space partitioned by the porous wall is pressurized below the bubble point pressure, the generated gas does not leak out of the pores of the porous wall and is not treated. The separated liquid obtained by removing the gas from the liquid is extracted from the pores of the porous wall to the outside of the porous wall. The gas left in the space is separated and collected separately. Further, in the case where the chemical reaction medium is provided in the porous tubular body, when the liquid to be treated is fed into the porous tubular body, the liquid to be treated comes into contact with the chemical reaction medium to generate gas. Then, the separated liquid excluding the generated gas is extracted to the outside of the porous tubular body through the voids of the porous tubular body.

On the other hand, in the case where the chemical reaction medium is provided around the porous tubular body, when the liquid to be treated is allowed to flow around the porous tubular body, gas is generated from the liquid to be treated,
The separated liquid after removing the gas is extracted into the inside of the porous tubular body through the voids of the porous wall and is collected through the porous tubular body.

The bubble point pressure of the porous wall is determined by immersing the porous wall in a liquid (for example, water), applying gas pressure from one side of the porous wall to push out the liquid in the pores, and bubbles from the other side. It can be obtained from the gas pressure at the start of (bubble point method). The bubble point pressure P is P = K · 4πγ · using the maximum pore diameter r of the porous wall, the surface tension γ of the liquid, the contact angle θ between the liquid and the porous wall surface, and the shape factor K of the pores. It is known that the relational expression cos θ · 1 / r is approximately satisfied, and it is also possible to estimate the range of the pore diameter according to the processing pressure from this equation.

For example, if the working pressure is set to ² kg / cm ² , the bubble point pressure P of the porous wall used must be at least higher than 2 kg / cm ² . Here, when the porous wall is an alumina ceramic porous body and the liquid to be treated is water, the surface tension of the water is 73 dy.
ne / cm, the contact angle between water and alumina ceramic is 1
0, the shape factor of the pores of the alumina ceramic porous body was set to 0.
2, the maximum pore diameter r is 0.9μ from the above relational expression.
It is calculated as m or less. Generally, since the distribution of pore diameter has a width, it is advisable to select and use a porous body having a pore diameter in consideration of it.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas-liquid separator embodying the present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory diagram showing an overall schematic configuration of a gas-liquid separation device according to the present invention, and FIG. 2 is a schematic cross-sectional view of a porous tube body in which a catalyst or enzyme is included in the gas-liquid separation device. FIG.

The gas-liquid separating device D according to the present invention comprises a liquid-to-be-treated storage tank T for storing a liquid to be treated, and a gas-liquid separating section S for separating the liquid to be treated into a gas component and a liquid component. In this embodiment, 1% hydrogen peroxide solution (H ₂ O ₂ solution) is stored in the liquid to be treated storage tank T as a liquid to be treated. The treated liquid storage tank T is connected to the treated liquid supply pipe 10 that connects the treated liquid storage tank T and the gas-liquid separating section S.
And the liquid to be treated is separated from the liquid to be treated storage tank T into a gas-liquid separation unit S
Pump 11 for forcibly supplying a certain pressure to the
Is installed.

The gas-liquid separating section S is a liquid recovery casing 20.
A plurality of (4 in this embodiment) porous tubular bodies 12 (1
2a, 12b, 12c, 12d) are inserted in parallel, and each porous tube body 12 is connected via a joint tube J so as to form one continuous flow path. The starting end side porous tubular body 12a is connected to the storage tank T via the liquid to be treated supply pipe 10 as described above, and the liquid to be treated supply pipe 10 has the open / close valve in addition to the pump 11 described above. V
Is provided.

On the other hand, an outlet portion 14 for discharging the gas vaporized and separated in the gas-liquid separation portion S is formed in the end side porous tube 12d, and the processing gas is provided at the tip of the outlet portion 14. A pipe 16 is connected, and this processing gas pipe 16 has
A pressure regulating valve 15 for adjusting the pressure inside the porous tube body 12 is provided.

Further, at the bottom of the liquid recovery casing 20, there is formed a saucer portion 20a for receiving the solvent (water) extracted from the outer pipe wall of each porous pipe body 12,
A drain port 22 for draining the collected water as a treatment liquid is provided in the tray 20a, and a drain pipe 23 for sending the treatment liquid to another device is connected to the drain port 22.

Here, referring to FIG. 2, the porous tubular body 12
The configuration will be described in detail. Each porous tube body 12 forming the gas-liquid separation section S has a plurality of pores 17 formed over the entire wall of the hollow tube body having an outer diameter of 7 mm and an inner diameter of 5 mm. On the inner wall surface 13 of the porous tubular body 12, a manganese dioxide powder layer 18 carrying manganese dioxide is thinly formed over the entire area, and the inside of the porous tubular body 12 has a diameter of about 1 mm. The manganese dioxide carrier 19 which has been crushed into granules is filled so as to occupy about 50% of the internal space. It should be noted that FIG. 2 is a model view of the porous tube body 12 in which the pores 17 are formed and the manganese dioxide powder layer 18, and does not exemplify the actual state of the pores 17.

The porous tube body 12 is manufactured as follows. That is, alumina powder 1 having an average particle size of 5 μm
The respective raw materials were put into a mixer and kneaded so that the compounding amounts were 20 g of silica stone, 30 g of talc, 20 g of methyl cellulose, and 100 g of water per kg, and the kneaded product had an outer diameter of 7 by an extruder. 7 mm, inner diameter 5.5 m
A hollow raw tube of m is manufactured. Then, after the green tube is naturally dried, it is burned at 1600 ° C. for about 3 hours to decompose and burn down the methylcellulose contained in the green tube, and silica stone and talc are used as sintering aids. The alumina particles work together to sinter. At that time, a porous tube body 12 having a large number of continuous ventilation holes 17 in which ventilation voids (continuous ventilation holes) 17 are three-dimensionally formed between the alumina particles is obtained.

Pores 17 formed in the porous tube body 12
Has an average pore diameter of 0.8 μm, and the porosity indicating the amount of pores 17 per unit area is 41%. The bubble point pressure, which is the boundary pressure at which only the liquid to be treated (permeate) is permeated and oxygen gas (gas) is not permeated, is 1.7 kg /
It has a characteristic of cm ² . As long as the gas-liquid separation operation is performed at an operating pressure equal to or lower than the bubble point pressure thus obtained, oxygen gas (gas component) will not be extracted outside the porous tubular body.

Next, a method of fixing the catalyst on the porous tube body 12 will be described. Manganese dioxide powder (reagent) 1
00 g, 60 g of water, and 1 g of polyvinyl alcohol were mixed in a ball mill for 18 hours to prepare sludge, and the sludge was dipped into the porous tube body 12 coated with a wax on the outer surface to oxidize the inner surface. The manganese powder layer 18 is formed by coating. Then, after the porous tube body 12 is naturally dried, it is baked at 1300 ° C. for about 1 hour to decompose and burn off the polyvinyl alcohol and the wax, and to have a large number of pores 18a and a thickness of about 100 μm. The manganese dioxide powder layer 18 is formed on the surface of the inner wall 12 a of the porous tubular body 12.

Next, the operation of the gas-liquid separator D provided with the porous tube body 12 manufactured in this way will be described. When the pump 11 is driven, the treated liquid storage tank T
Hydrogen peroxide solution stored in the
When the opening / closing valve V is opened, the gas is fed to the gas-liquid separation section S through the starting end side porous tube body 12a and starts to flow inside the porous tube body 12. This hydrogen peroxide solution is formed on the inner wall surface 13 of the porous tube body 12 and filled inside the porous tube body 12 when passing through the plurality of porous tube bodies 12a, 12b, 12c, 12d, It contacts the manganese dioxide powder layer 18 and the manganese dioxide carrier 19 which function as a catalyst for decomposing the hydrogen peroxide solution.

Here, manganese dioxide is well known as a catalyst for decomposing hydrogen peroxide (H ₂ O ₂ ) into water (H ₂ O) and oxygen (O ₂ ), and 2H ₂ O ₂ → 2H Hydrogen peroxide is decomposed into water and oxygen gas by a catalytic chemical reaction represented by ₂ O + O ₂ . Therefore, it is not necessary to use any power or energy for this chemical decomposition reaction, and neither vibration nor noise is generated. Together with this decomposing means, the porous tube body 12 separates and collects oxygen and water generated by the chemical decomposition reaction of hydrogen peroxide.

The porous tube body 12 used here allows only the liquid component (water) to permeate and does not permeate the gas component (oxygen) in the case of the gas-liquid separation operation in which the working pressure is set to the bubble point pressure or less. It has pores 17. Therefore, oxygen, which is a gas component, remains inside the porous tube body 12 without being extracted to the outside of the porous tube body 12, and reaches the processing gas outlet portion 14 formed in the fourth porous tube body 12. It flows and is stored in a processing gas container or the like from the pressure regulating valve 15 through the processing gas pipe 16.

The pressure regulating valve 15 is used to maintain a constant pressure inside the porous tube body 12 to prevent the gas-liquid separation work from being delayed and at the same time regulate the bubble point pressure. In this way, the porous tubular body 12
The pressure inside the porous tube body 12 is kept constant in order to extract water, which is a liquid component of hydrogen peroxide water after the oxygen gas is generated, to the outside. The pressure in the porous tube body 12 must be kept higher than the pressure, and the pressure in the porous tube body 12 should not exceed the bubble point pressure in order to prevent oxygen, which is a gas component, from being extracted to the outside. This is because it needs to be adjusted.

On the other hand, the liquid component (water) in which the gas component has disappeared
Can be freely extracted from the pores 17 to the outside of the porous tubular body 12 as long as a pressure difference is generated between the inside of the porous tubular body 12 and the outside of the porous tubular body 12. Due to the pressure difference between the inside and the inside of the porous pipe 12, the air is extracted from the pores 17 formed in the porous tubular body 12 to the outside. At this time, the pore diameter r is as small as about 0.8 μm, and the pore path is complicatedly formed. Therefore, the impurities contained in the liquid component (water) are also removed at the time of permeation, so that the permeated water is It can be used as sterilized water.

As described above, the water extracted on the outer surface of each porous tube body 12 falls toward the saucer portion 20a formed at the bottom of the liquid recovery casing 20 and is collected.
The water thus collected in the pan 20a is sent to the next apparatus as treated water through the discharge port 22 through the discharge pipe 23.

In the present embodiment, the gas-liquid separating section S is composed of four porous pipe bodies 12 (12a, 12b, 12c, 12d), so that the oxygen separation operation and the gas separation operation are performed in each porous pipe body 12. Liquid separation operation is performed. Therefore, the hydrogen peroxide in the hydrogen peroxide water decreases as it flows to the first and second lines, and almost no hydrogen peroxide remains in the terminal porous tube 12d, and the desired gas component Only oxygen and enough water to moisten the porous tube body 12 remain. Further, by providing the plurality of porous tubular bodies 12 in this way, the separation accuracy is improved, and the gas component and the liquid component can be separated with an extremely high separation rate.

Next, the gas-liquid separation performance using the gas-liquid separation device D according to the present invention will be described with reference to the experimental results. This experiment was carried out using the gas-liquid separator D shown in FIG. 1, and 1% hydrogen peroxide solution was used as the liquid to be treated, and the flow rate by the pump 15 was 1 kg / cm ² under the conditions. 12 ml / min. The experiment was conducted as. The concentration of hydrogen peroxide water in the treatment liquid obtained by the experiment has dropped to 0.01%, and the concentration of hydrogen peroxide water is about 1/100 using the gas-liquid separator D according to the present invention. It means to reduce to.

In this embodiment, manganese dioxide is used as a catalyst for vaporizing oxygen from the hydrogen peroxide solution. However, if an enzyme (catalase) is used in addition to this, the oxygen can be similarly removed from the hydrogen peroxide solution. Can be vaporized.

The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments.
It can be easily inferred that various modifications and improvements can be made without departing from the spirit of the present invention. That is,
In this embodiment, a case has been described in which a catalyst (manganese dioxide) is used as a gas generating means from hydrogen peroxide water to generate oxygen gas. However, in addition to this, a catalyst (manganese dioxide) is gasified from ozone water. It may be used when removing ozone (O ₃ ) by using it as a generating means, and it may be used as a means for generating a gas of a catalyst or an enzyme capable of gasifying and removing a desired gas component from a liquid to be treated. Is.

In the present embodiment, the porous tube is used for gas-liquid separation and collection, but the invention is not limited to this as long as it has a spatial structure having a porous wall. For example, one wall may have a porous wall. It may be a rectangular tube provided with. Further, the raw material of the porous tubular body may be porous silica or zeolite in addition to alumina as long as it is adjusted so as to obtain a desired pore size, and it is limited to the raw material used in this example. There is no. Further, the molding method is not limited to the molding method used in the examples, as long as the molding method according to the raw material is adopted.

Further, the method of supporting the catalyst and the enzyme on the porous tubular body differs depending on the catalyst and the enzyme to be used, and the optimum supporting method for each catalyst and enzyme may be adopted. The method is not limited. In addition, in the present embodiment, the case where the liquid to be treated flows inside the porous tube by placing a catalyst or the like for gas generation inside the porous tube is described. The same result can be obtained by placing the catalyst or the like in the liquid so that the liquid to be treated flows around the porous pipe and collecting the extract liquid after gas separation into the pipe.

[0040]

As is apparent from the above description, according to the gas-liquid separation device of the present invention, the liquid to be treated fed to the space partitioned by the porous wall through which the liquid can permeate is chemically treated. A gas is generated by the reaction with the reaction medium, and only the liquid part excluding the generated gas is separated and recovered through the porous wall, so that it depends on the boiling point of the liquid to be treated or its solute. It is possible to perform gas-liquid separation without using the gas-liquid separation and to perform gas-liquid separation with high gas-liquid separation accuracy. In addition, since it is not necessary to use a power unit for generating gas, energy for operating such a power unit is not required, noise and vibration are not generated by the power unit, and space saving is required. It has many advantages such as continuous gas-liquid separation operation.

[Brief description of drawings]

FIG. 1 is an overall view showing a schematic configuration of a gas-liquid separation device according to the present invention.

FIG. 2 is a diagram schematically showing a cross section of a porous tube body in which a catalyst or an enzyme is included in the gas-liquid separation device shown in FIG.

[Explanation of symbols]

 12 Porous tubular body 17 Pore 18 Manganese dioxide powder layer 19 Manganese dioxide carrier D Gas-liquid separation device

Claims (6)

[Claims] 1. A chemical reaction medium that chemically reacts with a liquid to be treated to be fed into the space to generate a gas is provided in the space partitioned by a porous wall through which the liquid can pass, and the chemical reaction is performed. A gas-liquid separation device, characterized in that the separated liquid after removing the gas generated by the medium is extracted and separated through the porous wall. 2. The gas-liquid separation device according to claim 1, wherein the chemical reaction medium is a catalyst. 3. The gas-liquid separation device according to claim 1, wherein the chemical reaction medium is an enzyme. 4. A liquid to be treated, in which a porous wall for partitioning the space is formed by a porous tubular body, the chemical reaction medium is provided in the porous tubular body, and is fed into the porous tubular body. The separated liquid excluding the gas generated by the chemical reaction medium from is extracted to the outside of the porous tubular body through the porous wall of the porous tubular body. Gas-liquid separation device. 5. A porous wall partitioning the space is formed by a porous tube body, the chemical reaction medium is provided around the porous tube body, and flows through the periphery of the porous tube body. The separated liquid obtained by removing the gas generated by the chemical reaction medium from the solution to be treated is extracted through the porous wall of the porous tubular body into the porous tubular body. Gas-liquid separation device. 6. The gas-liquid separator according to claim 1, wherein the pressure for feeding the liquid to be treated is lower than the bubble point pressure of the porous wall.