JP3391333B2 - Packaging method of zeolite adsorbent and filling method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for packing a zeolite adsorbent, and more specifically, a method in which a gas mixture is separated by a method mainly represented by a pressure oscillation adsorption method to obtain oxygen gas and nitrogen. The present invention relates to a method of suitably packaging, storing, and transporting a zeolite adsorbent used for separating and collecting gas, carbon dioxide, hydrogen gas, carbon monoxide, etc., while suppressing its deterioration. Furthermore, the present invention relates to a method for suitably packing the packed zeolite adsorbent into an adsorption tower prepared for using the same.

[0002]

2. Description of the Related Art Zeolite adsorbents are usually used in a state in which water is removed (activated state), but water has the highest affinity for zeolite adsorbents and is in the activated state. When it comes into contact with air, it quickly adsorbs water in the air, and as a result, the adsorption point is occupied by water molecules, which obstructs the adsorption of gas molecules and reduces the separation performance of the zeolite adsorbent. It's becoming.

Therefore, when the activated zeolite adsorbent is stored or shipped as a product, the zeolite adsorbent is packaged so as not to absorb moisture due to water present in the air, and the product is stored and shipped. .

In general, the product of the zeolite adsorbent is packaged and shipped in the form of a package such as a drum or a flexible container. If the packaging is a drum, it can usually be packaged in an arbitrary volume within the range of several liters to 200 liters depending on the requirements of the delivery destination. Since it is possible to shut off the water, once it has been packaged, it hardly absorbs moisture unless the lid of the drum can is opened.

Therefore, the packaging method using the drum can is the method in which the moisture absorption in the air is the least, and it is particularly used as the packaging method for the zeolite adsorbent which is desired to avoid moisture absorption. However, except for specially made drums,
Usually, the maximum packing amount is about 200 liters (about 120 kg when the packing density of the zeolite adsorbent is 0.6 kg / liter), which is not suitable for large-scale shipment of several tens of tons. For example, when shipping 50 tons of zeolite adsorbent, a large volume of 400 or more drums is required for 200 liters of drums, and the number of drums is large.
Since it takes time to fill the adsorption tower with the zeolite adsorbent in the drum, a considerable amount of water is absorbed when the adsorption tower is filled with the adsorbent.

When such a large amount of adsorbent is shipped, stored or transported, it is carried out in a flexible container having a larger packaging amount than a drum can. Generally, a flexible container has a packing amount of about 100 kg to 1 ton, and can pack a larger amount of zeolite adsorbent than a drum can. The flexible container is composed of an outer bag and an inner bag, and the zeolite adsorbent is put into the inner bag and packaged. As the inner bag, a polyethylene bag is generally used because of its low price and relatively easy handling. However, polyethylene has moisture permeability, and in order to suppress moisture permeation through the material of the inner bag, the adsorbent may be packaged by the method of making the inner bag double. It was difficult to hold down completely.

When the packing is a flexible container, the adsorbent inlet of the inner bag is usually tightly bound and sealed with a string-like one, but it is not completely sealed.
The outside air penetrates into the inner bag through a slight gap formed in the sealed portion and absorbs the zeolite adsorbent. Sealing may be performed at two or more places in order to suppress moisture absorption from the sealed portion, but even in this state, it is difficult to completely seal and moisture will enter the inside of the inner bag. In addition, since the zeolite adsorbent has the property of repeatedly adsorbing and desorbing air as the temperature rises and falls, if there is a gap in the sealed part, outside air will be inhaled due to the temperature difference between day and night, and the zeolite adsorbent will absorb moisture. It will also end up. On the other hand, on the contrary, when the outside air temperature rises, the gas adsorbed by the zeolite adsorbent may be released. In that case, if the packaging bag is completely sealed, the released gas will go out of the packaging bag. Since it is not released, the internal pressure of the bag increases, the bag is damaged, and there is a risk that the packed zeolite adsorbent may come into contact with the outside air to absorb moisture and deteriorate.

When packing the zeolite adsorbent,
The product transport line until the product is packaged is shielded from the outside air and the dew point is kept low so that it does not absorb moisture before being packaged through the transport line. However, even if moisture is prevented from occurring in the product transportation line until packaging, it is packaged in a flexible container and while the product is stored in the warehouse or transported by sea over a long period of time, It was extremely difficult to avoid moisture absorption through the material of the inner bag of the flexible container or the sealed portion of the inner bag.

Therefore, in Japanese Patent Laid-Open No. 10-181792, one or more ventilation holes are provided on the side surface of the flexible container for packaging the powder, and the front side of the ventilation port is waterproof. Moisture-proof cloth is sewn on,
There is sewn only on both sides and the upper side, the lower side is not sewn, and the air inside the flexible container can flow out. However,
When the zeolite adsorbent is packed using such a packaging bag, the zeolite adsorbent has a property of repeating adsorption and desorption of gas due to changes in the outside temperature, and since the adsorption affinity for gas is large, even in a small gap. Even the outside air circulates and absorbs moisture. Therefore, JP-A-10-1817
In Japanese Patent Laid-Open No. 92, a waterproof / moisture-proof cloth is provided, but if there is a gap in any of the bags, the outside air circulates and the packed zeolite adsorbent absorbs moisture. In addition, even if the waterproof moisture-proof cloth is sewn on all four sides, the amount of outside air that passes through the zeolite adsorbent will be large, and the waterproof moisture-proof cloth will soon become saturated with water, making long-term storage or transportation difficult. There is a nature. Furthermore, no particular moisture-proof means is provided for sealing the inlet of the powder or granules, and it is unavoidable that the zeolite adsorbent absorbs moisture due to water entering through the gap of the sealing portion.

Further, in Japanese Patent Laid-Open No. 11-59782, a packaging material for transportation having excellent airtightness is used, and sealing is performed by heat sealing. Heat sealing is a highly airtight sealing method, but when sealing a large flexible container, the work is difficult to perform, and in the packing of zeolite adsorbent that has the property of repeating adsorption and desorption of gas, If the packaging bag is completely sealed, if a large amount of gas is released from the zeolite adsorbent, the pressure inside the packaging bag may increase and the packaging bag may be damaged. Sex is necessary.

As described above, in the packaging, storage and transportation of the zeolite adsorbent by the conventionally known packaging bag or packaging method, the quality deterioration of the packed zeolite adsorbent can be avoided and the workability can be improved. Was desired.

[0012]

Zeolite adsorbent has an extremely high affinity with water as compared with other gas molecules,
If moisture in the air is absorbed before it is used as an adsorbent, its adsorption performance will be significantly reduced, and it will not be possible to exhibit sufficient adsorption performance. Therefore,
After manufacturing the zeolite adsorbent, store it until shipment,
Since absorption of moisture during transportation will deteriorate the performance as an adsorbent, it has been a major issue to avoid moisture absorption as much as possible. In addition, during storage and transportation, it is necessary to avoid damage to the packaging bag even if gas is released from the zeolite adsorbent due to changes in ambient temperature. In particular, in order to manufacture, package, store, and transport on a large scale, which is industrial scale,
It was necessary to take appropriate packaging, storage, and transportation methods accordingly. Further, it is necessary to fill the adsorption tower or the like with the packed zeolite adsorbent in a short time or simply for its use. Based on such a background, the purpose of the present invention is to
It is an object of the present invention to provide a packaging method in which a zeolite adsorbent can be packaged as a product without substantially deteriorating and does not absorb moisture during storage and transportation. Further, it is an object of the present invention to provide a packing method capable of packing the packed zeolite adsorbent into an adsorption tower or the like without deteriorating.

[0013]

Means for Solving the Problems The inventors of the present invention have diligently studied the material and packaging method of a packaging bag that can be used as a flexible container inner bag, and the method of properly filling a packaged package. The zeolite adsorbent is put into a packaging bag having two or more layers including a metal layer, and the packaging bag is sealed at a position on the upper portion of the packaging bag containing the zeolite adsorbent, and then above the sealing position. It is possible to prevent the moisture absorption of the zeolite adsorbent in the product by inserting the dehydrating agent from the above and sealing the position above the introduced dehydrating agent, in particular, sealing at the position above the introduced dehydrating agent. In this case, by folding the packaging bag and sealing at a total of 3 or more positions, it is possible to more reliably suppress the ingress of moisture from the outside air, and the dew point is -30 ° C.
It was found that moisture can be prevented before packaging the zeolite adsorbent by packaging in the following dehumidified air atmosphere. Furthermore, after lifting the zeolite adsorbent packaged by such a packaging method and moving it to the upper part of the packed tower or the like, the lower part of the packaging bag is opened, and the zeolite adsorbent is dropped to adsorption etc. ,
They have also found that they can be filled in a short time, and have completed the present invention.

The present invention will be described in detail below.

The packing method of the zeolite adsorbent of the present invention comprises:
After putting the zeolite adsorbent into the packaging bag having an opening and having two or more layers containing a metal through the opening of the packaging bag and sealing the upper part of the charged zeolite adsorbent, the dehydrating agent from above Is added and the upper part of the added dehydrating agent is sealed.

The packaging bag used in the present invention is, for example, one used as an inner bag of a flexible container, and the zeolite adsorbent of the product is packaged in an amount of about 200 liters or more, which is difficult to package in a drum can once. Those that can be used are preferably used. When packaging a zeolite adsorbent having a smaller capacity than this, a flexible container may be used, but a drum having high airtightness is often used. The flexible container is composed of an outer bag and an inner bag, and the outer bag preferably has a material and structure that can be lifted by a crane or the like. The inner bag is provided inside the outer bag, and the zeolite adsorbent of the product is packaged in the inner bag.

At the time of packaging, the zeolite adsorbent of the product is put into the inner bag of the flexible container from the opening which is the upper part of the inner bag of the flexible container, sealed and packaged above the zeolite adsorbent, and then stored and transported. Will be done.

When the zeolite adsorbent is packed in a container other than the bag, for example, in an adsorption tower in which adsorption separation is performed, the flexible container is lifted by a crane and the outer bag and inner bag of the flexible container are opened. , The zeolite adsorbent of the product falls from the lower part and is discharged to an adsorption tower or the like. The outlet through which the product is discharged is usually smaller than the inlet through which the zeolite adsorbent is put inside the inner bag, and heat-sealing with high sealing performance is used to prevent the ingress of water from there. Be seen. By moving the package containing the zeolite adsorbent packaged using such a packaging method of the present invention to the upper part of the adsorption tower and opening the lower part of the packaging bag, without dropping the dehydrating agent, the zeolite Only the adsorbent can be dropped and packed into the adsorption tower. In particular, even when using a bag for mass packaging called a flexible container, since there is a gap in the sealing part, it is possible to fill it easily at once, in a short time, and the zeolite adsorbent deteriorates by absorbing moisture when exposed to the outside air. Can be avoided as much as possible.

The packaging bag used in the present invention is a composite film having a layered structure having two or more layers including metal layers such as aluminum, gold, silver and copper. Among these metals, aluminum is preferably used in terms of price. Further, in the structure of the packaging bag, the number and types of layers constituting the packaging bag are not particularly limited as long as they include a metal layer and have a property of being able to be stored and transported without absorbing the zeolite adsorbent of the product.

As for the thickness of the metal layer, the thicker the thickness, the more difficult it is for moisture to permeate through the packaging bag. The thinner the thickness, the weaker the strength and the more easily the metal layer is damaged. If the metal layer has a thickness of 1 μm or more, moisture permeation through the material of the flexible container inner bag can be suppressed, and the strength can be sufficiently endured for normal use.

Further, the layered structure of the inner bag of the packaging bag may be two or more layers including the metal layer, but usually the metal layer is sandwiched in order to prevent the metal layer from being damaged. A structure having 3 to 7 layers in total is preferably used. As materials other than the metal layer, resins such as polyethylene terephthalate (PET), nylon and linear low density polyethylene are used.

After the zeolite adsorbent is put into the packaging bag, the upper part thereof is sealed. As a method of sealing the packaging bag, there are a heat sealing method and a method of tying with a strap or the like. Generally, a strap or the like is used. It is done in a tied manner. As a string used for sealing, a binding band made of plastic or polyethylene, polypropylene,
A string made of vinyl or the like is generally used. You can also use something like a thin wire, but in this case, seal it carefully so that it does not damage the packaging bag. Furthermore, in the case of sealing with a string-shaped object, a dedicated jig or device may be used to seal more firmly.

In this way, the zeolite adsorbent is charged into the packaging bag, and then the packaging bag is sealed. However, it is not possible to completely seal the packaging bag, no matter how strongly it is sealed, so as not to damage the packaging bag. It is difficult and inevitable that there is a small gap that communicates with the outside air. Therefore, the zeolite adsorbent can be prevented from absorbing moisture by enclosing a dehydrating agent in the sealing portion in order to remove water that enters from the outside air. When the zeolite adsorbent is packaged by the method of the present invention, the sealing portion is at least two places, that is, the upper part of the product zeolite adsorbent (between the dehydrating agent and the product zeolite adsorbent) and the upper part of the dehydrating agent. Furthermore, even if moisture enters from the gap of the sealing part, the number of parts to be sealed may be increased in order to slow the diffusion speed, and the packaging bag above the dehydrating agent may be folded back and further sealed, that is, 3 places in total. You may seal at the above positions. In particular, by folding and sealing the packaging bag, in addition to the above-mentioned effects, foreign matter is prevented from entering in advance, and the packaging bag (inner bag) containing the zeolite adsorbent becomes more compact and It is possible to put it in easily.

Further, the zeolite adsorbent has a property of adsorbing a large amount of gas, and has a property of releasing the gas adsorbed in advance when the temperature rises. For this reason, when packaging at low temperatures and shipping in areas or periods with high temperatures, if the packaging bag is sealed by a method such as heat sealing, high pressure is applied to the inside of the packaging bag, and in some cases the inner bag is It may be damaged. In the packaging method of the present invention, it is tightly sealed with a string or the like, but since it is not completely sealed, the gas released from the zeolite adsorbent may pass through the outside of the packaging bag through a slight gap formed in the sealed portion. It does not damage the packaging bag.

The type of dehydrating agent used in the method of the present invention is not particularly limited as long as it is usually used as a dehydrating agent, and generally silica gel, activated alumina,
Niline pentoxide, calcium oxide, calcium chloride, a zeolite adsorbent, etc. can be used. More preferably, a zeolite adsorbent capable of adsorbing a very small amount of water can be used, and further preferably the same zeolite adsorbent as the zeolite adsorbent packaged as a product can be used. This is because if the same zeolite adsorbent as the product is used as the dehydrating agent, it is possible to avoid mixing of foreign matter even if a part of the dehydrating agent falls out toward the product. The shape of the zeolite adsorbent used as a dehydrating agent is not particularly limited, but in the powder form, the pressure loss in the dehydrating agent portion becomes large, and the gas released from the zeolite adsorbent of the product is difficult to escape to the outside and the inner bag is damaged. Since there is a possibility of fear, a molded product in the form of beads or pellets can be preferably used.

The amount of the dehydrating agent enclosed in the sealed portion may be appropriately determined depending on the storage period, the transportation period, and the dehydrating ability of the dehydrating agent used. Further, the zeolite adsorbent has a property of repeating adsorption and desorption due to a temperature difference or a pressure difference, and the amount of the dehydrating agent can be determined in consideration of the amount of air adsorbed and desorbed. Considering the above conditions and the shape of the flexible container, the amount of dehydrating agent is 0.1 to 2 of the zeolite adsorbent of the product.
Amounts on the order of weight percent are preferably used.

By packing the zeolite adsorbent by the above-mentioned method, it is possible to prevent the zeolite adsorbent from being absorbed by the moisture that permeates through the material and the moisture that penetrates through the gap of the sealing portion.

When packing the zeolite adsorbent,
It is also important that moisture is not absorbed between the process of removing the water content of the zeolite adsorbent and the process of packaging. Therefore, it is preferable that the dew point is as low as possible inside the product transportation line in the manufacturing facility used for packing the zeolite adsorbent and the inside of the packaging bag for packing the product. If Further, in order to prevent the invasion of outside air, it is preferable to make the inside of the product transportation line and the inside of the packaging bag slightly higher than the atmospheric pressure.

The zeolite adsorbent packed in the method of the present invention is not particularly limited, but the zeolite framework has a relatively small SiO ₂ / Al ₂ O ₃ molar ratio and has a high affinity for water. Adsorbents such as X-type zeolite adsorbents of low silica ratio used for separating and adsorbing gas by pressure vibration adsorption method, X-type zeolite adsorbents, A-type zeolite adsorbents, Y-type zeolite adsorbents, etc. On the other hand, the effect is large, and particularly the effect is large for the X-type zeolite adsorbent having a low silica ratio.

The zeolite adsorbent packaged in the method of the present invention can be used for moisture permeation through the flexible container inner bag during storage, transportation, and filling for a long period of time, or for moisture from the sealed portion of the flexible container inner bag. Since the invasion is suppressed, the adsorptive separation performance is extremely low.

[0031]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited thereto. The water content of the zeolite adsorbent is measured by JIS
Reference was made to K0068 (method for measuring water content of chemical products). Specifically, it was carried out by the following method.

About 0.3 to 0.5 g of the zeolite adsorbent was weighed and placed in a dry nitrogen stream (300 ml / min) for 4 times.
Moisture was vaporized in an electric furnace set at 00 ° C., and the vaporized moisture was collected in an electrolytic solution and subjected to Karl Fischer titration (coulometric titration) to measure the water content. Coulometric titrator is Mitsubishi Chemical CA-06 type, moisture vaporizer is Mitsubishi Chemical VA-
Model 21 was used.

As the zeolite adsorbent, a faujasite type (LSX type) zeolite compact (diameter: 1.2) having a Li 2 ion exchanged SiO ₂ / Al ₂ O ₃ molar ratio of 2.0 is used.
˜2.0 mm bead shape) was used. This adsorbent was prepared as follows.

The LSX zeolite was synthesized by a conventionally known method. An aqueous sodium aluminate solution (N
a ₂ O = 20.0% by weight, Al ₂ O ₃ = 22.5% by weight)
3888 g, 7923 g water, sodium hydroxide (purity 9
9%) and reagent grade potassium hydroxide (purity 85%) 1
845 g was added and cooled with stirring at 60 rpm (liquid a: up to 5 ° C). In a polyethylene container having an internal volume of 10 liters, 7150 g of an aqueous sodium silicate solution (Na ₂ O = 3.8% by weight, SiO ₂ = 12.6% by weight) and water 1
176 g was put and it cooled (liquid b: -10 degreeC). While stirring liquid a, liquid b was added over about 5 minutes. The solution after charging was transparent. After stirring was continued for about 20 minutes after completion of the addition, the temperature of the water bath was raised to 36 ° C. At the same time as the solution became cloudy, stirring was stopped and the stirring blade was taken out.
Aging was performed at 6 ° C. for 48 hours.

Then, the temperature of the water bath was raised to 70 ° C. and crystallization was carried out for 20 hours. The obtained crystals were filtered, washed thoroughly with pure water, and then dried overnight at 80 ° C.
The structure of the obtained crystal powder was a faujasite single phase as a result of X-ray diffraction, and the composition analysis by ICP emission analysis showed that 0.72Na ₂ O.0.28K ₂ O.Al ₂ O ₃
It was 2.0 SiO ₂ and was confirmed to be LSX zeolite.

To 100 parts by weight of this LSX zeolite powder, 20 parts by weight of attapulgite type clay was mixed and kneaded with a mix muller mixer (manufactured by Shinto Kogyo Co., Ltd., model MSG-05S), and finally LSX was added while appropriately adding water. After adjusting by adding 65 parts by weight of water to 100 parts by weight of the zeolite powder, the mixture was sufficiently kneaded.

This kneaded product was agitated and granulated into beads having a diameter of 1.2 to 2.0 mm with a blade stirring granulator Henschel mixer (manufactured by Mitsui Mining Co., Ltd., model: FM / I-750).
Marumerizer molding machine (manufactured by Fuji Paudal, model: Q-
1000) for about 5 minutes and then at 100 ° C for 1
Dried overnight. Then, the attapulgite-type clay was sintered by calcination at 650 ° C. for 2 hours under air circulation using a tubular path (manufactured by Advantech), and then cooled in the atmosphere so that the water content was about 25%. Humidified.

This molded body was packed in a 70 mmφ × 700 mm (length) column, and an aqueous solution prepared by adjusting lithium chloride to a concentration of 1 mol / liter was passed at 80 ° C. for lithium ion exchange. Then, after the column is fully washed with pure water while being filled, it is taken out from the column and the temperature is 40 ° C.
And dried for 16 hours.

After that, activation treatment was carried out at 600 ° C. for 1 hour in a tubular furnace (manufactured by Advantech) under air circulation.
The sample that had been subjected to the activation treatment was placed in a can which was capable of being sealed without being cooled, and then sealed, and then cooled. The samples used in Examples 1 to 3 and Comparative Examples 1 and 2 were obtained by using the sealed and cooled samples.

Example 1 Four kinds of packaging bags having different materials or aluminum layers having different sizes were set to a size of 780 mm × 480 mm, and 1 kg (about 1.5 liters) of a zeolite adsorbent was packed therein. The packaging bag was heat-sealed on three sides of the rectangle. Then, the zeolite adsorbent inlet was sealed at position 1 shown in FIG. 1 using a plastic binding band so that voids were not formed inside. Then, about 10 g of a dehydrating agent was put in the upper part of the sealed part, and it was sealed at position 2 on the upper part with a plastic binding band. Further, the inner bag was once folded back on top of it and sealed at position 3 with a plastic binding band. Zeolite adsorbent is packed and sealed. Each sealed bag is kept at 50 ° C and 80% relative humidity in a constant temperature and humidity dryer (Tabay Espec Corp., model PL-2S).
It was stored in TH) for 1 month. The water content of the zeolite adsorbent was measured by the method described above, and the results are shown in Table 1.

[0041]

[Table 1]

The materials of the packaging bag used are shown in Table 2.

[0043]

[Table 2]

In Table 2, PET is polyethylene terephthalate, Al is aluminum, ONY is o-nylon, P
E represents polyethylene, LLPE represents linear low-density polyethylene, and the numerical values in the materials are the thickness of each material (unit: μ
represents m). The packaging bags (1) and (2) are manufactured by Oishi Sangyo Co., Ltd., and the packaging bags (3) and (4) are manufactured by Nippon Matai Co., Ltd.

As can be seen from the results in Table 1, there is almost no increase in the water content of the zeolite adsorbent after storage for one month, and the infiltration of water from the sealed portion is suppressed.

Example 2 The size of the inner bag, the amount of the packed zeolite adsorbent, the amount of the dehydrating agent, and the sealing method were the same as in Example 1. Save
It was conducted in a place without air conditioning so that the zeolite adsorbent would repeatedly adsorb and desorb due to the temperature difference between morning and night. The storage period is one month, the maximum room temperature is 34 ° C, and the minimum room temperature is 15
It was ℃. The maximum relative humidity was 85% and the minimum relative humidity was 32%. The water content of the zeolite adsorbent was measured by the method described above, and the results are shown in Table 3.

[0047]

[Table 3]

As can be seen from the results in Table 3, there is almost no increase in the water content of the zeolite adsorbent due to storage for one month, and even if the zeolite adsorbent repeats the adsorption / desorption phenomenon due to the temperature difference, Ingress of water is suppressed.

Example 3 A zeolite adsorbent was tested for storage using an actual flexible container. The zeolite adsorbent used was scaled up by a method essentially the same as in Example 1. The packaging was performed in an atmosphere having a dew point of -60 ° C. As the inner bag for packaging, the packaging bag (1) was used. The packed zeolite adsorbent weighs about 500 kg, and the dehydrating agent weighs about 2 kg.
It was enclosed in kg. The sealing method was the same as in Example 1. In other words, use a plastic zip tie for sealing,
The sealed part is between the zeolite adsorbent and the dehydrating agent of the product (Fig. 1
Position 1) and two places above the dehydrating agent (position 2 in FIG. 1)
And 3 and at position 3, the inner bag was folded back and sealed in a total of 3 places. Storage was carried out in a tent warehouse for about 2 months, during which the maximum temperature was 16 ° C and the minimum temperature was 4 ° C. The maximum relative humidity is 80% and the minimum relative humidity is 4
It was 1%. After about 2 months, the zeolite adsorbent and the dehydrating agent were sampled, and the water content thereof was measured by the method described above, and the results are shown in Table 4.

[0050]

[Table 4]

As can be seen from the results in Table 4, the zeolite adsorbent does not absorb moisture even after storage for about 2 months. Further, it is clear that the dehydrating agent is clearly absorbing moisture and adsorbs the moisture that enters through the gaps in the sealed portion.

Example 4 Packaging was carried out by the same packaging method as in Example 3, and storage was carried out for 8 months in a tent warehouse. Maximum temperature in the meantime is 3
The temperature was 6 ° C and the minimum temperature was -3 ° C. The maximum relative humidity was 85% and the minimum relative humidity was 41%. Table 5 shows the results of sampling the zeolite adsorbent and the dehydrating agent after about 8 months and measuring the water content.

[0053]

[Table 5]

As can be seen from the results in Table 5, a study was conducted using a zeolite adsorbent having a water content smaller than that in Example 3, but the zeolite adsorbent did not absorb moisture even after storage for about 8 months. Further, it is clear that the dehydrating agent is clearly absorbing moisture and adsorbs the moisture that enters through the gaps in the sealed portion.

Example 5 Packaging was carried out by the same packaging method as in Example 3, and the storage period was 13 months. The storage was done in the tent warehouse. During that time, the maximum temperature was 36 ° C and the minimum temperature was -3 ° C. The maximum relative humidity was 85% and the minimum relative humidity was 41%. The results of measuring the water content by sampling the zeolite adsorbent and the dehydrating agent after about 13 months are shown in Table 6.
Shown in.

[0056]

[Table 6]

As can be seen from the results in Table 6, the zeolite adsorbent does not absorb moisture even after storage for about 13 months.
Further, it is clear that the dehydrating agent is clearly absorbing moisture and adsorbs the moisture that enters through the gaps in the sealed portion.

Comparative Example 1 The same procedure as in Example 1 was carried out except that no dehydrating agent was used and the sealing was performed at two positions, position 1 and position 3. A schematic diagram of this sealing method is shown in FIG. The water content of the zeolite adsorbent was measured by the method described above, and the results are shown in Table 7.

[0059]

[Table 7]

As can be seen from the results in Table 7, when the dehydrating agent was not filled, the zeolite adsorbent obviously absorbed moisture, and the water penetrated from the sealed portion.

Comparative Example 2 The procedure of Example 1 was repeated, except that (5) LLPE 100 μm (manufactured by Oishi Sangyo Co., Ltd.) was used as the packaging bag. The water content of the zeolite adsorbent was measured by the method described above, and the results are shown in Table 8.

[0062]

[Table 8]

As can be seen from the results in Table 8, in comparison with the examples, when the polyethylene packaging bag was used, the water content permeated the material of the inner bag even when the dehydrating agent was used.
The zeolite adsorbent absorbs moisture.

[0064]

According to the present invention, the following effects can be obtained.

(1) Packing a large amount of the zeolite adsorbent in a packing bag is only sealed at two or more places as compared with the packing process in a drum can, and in terms of packing process and time,
It will be simpler and easier to mechanize.

(2) Just by installing a dehydrating agent in the sealing portion, it is possible to prevent the moisture in the gas from entering through the gaps in the sealing portion and to be packaged during packing, storage and transportation. The deterioration of the adsorbent can be suppressed.

(3) Adsorption and desorption of gas peculiar to the zeolite adsorbent can be dealt with, and the internal pressure of the packaging bag is not excessively raised, so that the bag is not damaged.

(4) Even in a large-volume packaged product such as a flexible container, it can be filled in an adsorption tower or the like simply by opening the lower part of the bag, so that it can be processed in a short time or simply.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a sealing method performed in Examples 1 to 3 and Comparative Example 2.

FIG. 2 is a schematic diagram of a sealing method performed in Comparative Example 1.

[Explanation of symbols]

1: Inner bag for packaging 2: Zeolite adsorbent (product agent) 3: Plastic binding band used for sealing at position 1 4: Dehydrating agent 5: Plastic binding band used for sealing at position 2 6: The plastic tying band used for sealing at position 3 7: sealing position at position 1 8: sealing position at position 2 9: sealing position at position 3

Claims (8)

(57) [Claims] 1. A zeolite adsorbent is put into a packaging bag having an opening and two or more layers including a metal layer through the opening, and the upper portion of the put zeolite adsorbent is sealed and then A method for packaging a zeolite adsorbent, which comprises adding a dehydrating agent from above and sealing the upper side of the introduced dehydrating agent. 2. The method for packaging a zeolite adsorbent according to claim 1, wherein the packaging bag is folded back and sealed at two or more positions when sealing is performed above the put dehydrating agent. 3. The method for packaging a zeolite adsorbent according to claim 1, wherein the packaging is performed in an atmosphere of dehumidified air having a dew point of −30 ° C. or lower. 4. The method for packaging a zeolite adsorbent according to claim 1, wherein the metal layer is an aluminum layer. 5. The method for packaging a zeolite adsorbent according to claim 1, wherein the dehydrating agent is a zeolite adsorbent. 6. The method for packaging a zeolite adsorbent according to claim 5, wherein the dehydrating agent is the same zeolite adsorbent as the zeolite adsorbent to be packaged. 7. The packing method for a zeolite adsorbent according to claim 5, wherein the dehydrating agent is a molded article of the zeolite adsorbent. 8. A zeolite packaged in the adsorption tower after moving the package packed by the method according to any one of claims 1 to 7 above the adsorption tower. A method for filling a zeolite adsorbent, which comprises dropping the adsorbent.