JPS62132544A - Production of adsorbent - Google Patents

Abstract

PURPOSE:To obtain a uniform titled adsorbent having improved adsorption performance and strength by kneading cement powders with a powdery absorbent agent which is wetted suitably on the surface thereof followed by pouring it into an arbitrary forming mold, drying and solidifying it. CONSTITUTION:The titled adsorbent is formed by wetting suitably the surface of the powdery absorbent such as a synthetic zeolite, an active alumina and a silica gel, etc., and adding the cement powder followed by kneading, and by pouring the obtd. powdery adsorbent into the arbitrary forming mold followed by drying to solidify. To wet suitably the powdery adsorbent, said adsorbent is dipped in water, thereby centrifuging it to suitably wet the surface of the obtd. adsorbent. The compounding ratio of the cement powder to the powdery adsorbent agent is most preferably 10-30wt% the weight dry basis of the powdery adsorbent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an adsorbent for drying gas having an arbitrary shape and used in a dehumidifying device for removing moisture from compressed air.

[Conventional technology]

The conventional manufacturing method for this type of adsorbent is
There is one disclosed in Publication No. 7-38504. In this conventional technology, furfuryl alcohol and a small amount of inorganic acid are mixed and cooled while stirring, leaving some unreacted gas behind, and the mixture is poured into a binder made of arbitrary granular or powdered adsorbent. This is a production method in which the mixture is mixed, then thermally cured in a molded body, and then cooled to dryness. In addition, as other conventional techniques,
There is a zeolite filament shaped body described in Nippon Kinzoku Shimpo. This is a manufacturing method in which an adsorbent made of gel-like natural or synthetic zeolite is extruded into threads, layered, formed into a predetermined shape, and fixed by firing at a high temperature.

[Problem that the invention seeks to solve]

Among the above-mentioned conventional techniques, the former manufacturing method is a method of manufacturing using a resin produced by mixing and stirring furfuryl alcohol and an inorganic acid, but the temperature of the heat generated by the polymerization reaction during the resin production is Fine adjustment of the adsorption capacity is extremely important, and there are still unresolved issues in the cooling equipment technology for this purpose.Also, the disadvantage of the resin covering the surface of the particulate adsorbent and impairing the adsorption performance is that it can cause cracking and foaming. It is said that the improvement is achieved by making the resin porous, but it is unclear to what extent the resin becomes porous, and therefore, it is difficult to conclude that it is suitable for molding adsorbents in conjunction with the cooling equipment mentioned above. There is a problem.

Furthermore, the latter manufacturing method has a problem in that since the adsorbent is connected in the form of a thread, the surface area of the adsorbent for contact with the processing air is limited. In addition, the production cost is high because the manufacturing equipment for molding is large and technology related to manufacturing the adsorbent is also required.Furthermore, since the adsorbent is extruded and laminated, it is difficult to mold the adsorbent into an arbitrary shape. There is a problem in that it is difficult to mold and there are restrictions on the molding shape.

[Means for solving problems]

In view of the above-mentioned circumstances, the present invention has been made for the purpose of producing a strong adsorbent using commercially available particulate adsorbent with only simple equipment without impairing the adsorption performance, and to provide a means for achieving the same. This is because the surface of the particulate adsorbent is moderately moistened, cement powder is added and kneaded, and then the mixture is poured into an arbitrary mold, packed, and then dried and solidified.

〔Example〕

An embodiment of the invention will be described below with reference to FIG.

The method of this invention is to produce an adsorbent by properly moistening the particulate adsorbent, adding cement powder, kneading it, pouring it into an arbitrary mold, compacting it, and drying it to solidify it. be. This invention method will be explained in more detail.

As the particulate adsorbent, commercially available easily available particulates made of synthetic zeolite, activated alumina, silica gel, etc. can be used, but spherical adsorbents are particularly suitable.

In order to properly wet such a particulate adsorbent, the adsorbent is immersed in water, and then the surface is brought into a moderately wet state using a centrifugal separator.

As the cement powder, Portland cement powder, which is inexpensive and easily available, is sufficient, but the present invention is not limited to this, and other types of cement powder may be used. This cement powder is added to the particulate adsorbent while being scattered and kneaded. The surface of the particulate adsorbent is moderately moist, so when cement powder is added to it, the cement powder becomes sticky due to hydration and does not cover the entire particulate adsorbent. Bring about interconnectedness. If a mixture of cement powder and water is mixed with the particulate adsorbent or if the surface of the particulate adsorbent is too wet, the surface of the particulate adsorbent will be covered with cement powder and the adsorption performance will be impaired. Therefore, the order and wetting operations described above are important. It has been experimentally found that the optimum mixing ratio of this cement powder to the particulate adsorbent is 10 to 30% by weight of the dry particulate adsorbent; Even if there is, the adsorption effect will not be reduced, although the mutual connection of the particulate adsorbent will be weak, and if it exceeds this range, the cement powder will cover the surface of the particulate adsorbent too much and deteriorate the adsorption performance, but This is not limited to the above range, as it may be more suitable for use in places with strong vibrations since the mutual connection becomes stronger.

After adding and kneading cement powder in this way, it is poured into a mold and molded. The shape of this mold changes depending on the purpose of use of the adsorbent to be manufactured, so various shapes are used, but the most commonly used mold is a cylinder with a thick outer periphery as shown in Figure 2. In order to manufacture a type of adsorbent, a cylindrical core material is placed in the center of a cylinder with a bottom.

After pouring into such a mold, the mixture is allowed to air dry, then released from the mold, and further dried if necessary to obtain an adsorbent as shown in FIG. 2, for example.

In addition, in order to further strengthen the mutual bonding of the particulate adsorbent due to the coagulation power of cement powder, bentonite,
By adding starch, aluminum powder, surfactants, or fibers such as carbon fiber, glass fiber, or asbestos as strength-assisting materials, the strength of the completed adsorbent will be further improved.
It is desirable to add as much as possible. A desirable specific ratio of adding such a strength reinforcing member to cement powder is as follows.

(11 cement powder, weight ratio of cement powder: 0.1 to 2%)
Added aluminum powder.

(2) Cement powder to cement powder weight ratio of 5 to 40
% bentonite added.

(3) Add cement powder to cement powder weight ratio of 0.1 to
Contains 2% starch.

(4) Cement powder to cement pillow type 1 ratio 0.01
~0°2% surfactant added.

(5) Cement powder, cement powder ff1fi ratio 1
~5% fiber added.

A specific example of manufacturing an adsorbent by the manufacturing method described above is as follows.

16-2 consisting of synthetic zeolite as a particulate adsorbent
Approximately 20 kg of 0 mesh spherical product is used, and this is approximately i
n? 3,600 g (weight ratio of dry particulate adsorbent: 18%)
A mixture of cement powder and 36g of aluminum powder as a strength reinforcing material was sprinkled from above and stirred.
Pour the mixture into a mold containing a cylindrical core material (radius: 50 cm, height: 40 cm) in the center, and pack it in so that there are no gaps. With the amount used above, four pieces were poured into such molds. After leaving it to dry naturally for 24 hours, it was released from the mold and air-dried again for several days.Finally, forced drying was performed using ventilation to create a cylindrical shape with a thick outer periphery as shown in Figure 2. We were able to obtain an adsorbent.

This adsorbent removes moisture from the compressed air that enters from the outer periphery of the cylinder, as shown by the arrow in Figure 2, and sends it out as dry compressed air from the center hole, or conversely, removes moisture from the compressed air that enters from the center hole. It is designed to use air to remove moisture within the adsorbent and discharge it from the outer periphery.

〔Effect of the invention〕

According to the invention as described above, the particulate adsorbent that is the main raw material can be commercially available, so it is easy to obtain and inexpensive, and the special equipment for producing the adsorbent is not a centrifuge. It has the advantage of requiring only relatively simple manufacturing equipment such as a stirrer. In addition, if the particulate adsorbent is formed into a spherical shape, its surface area can be made extremely large.
There is an advantage that the adsorption performance, that is, the dehumidifying effect, increases accordingly. Furthermore, by thoroughly stirring the particulate adsorbent and cement powder and strongly compressing them during molding, a highly strong and uniform adsorbent can be obtained. Furthermore, in addition to this, since it is poured into a mold of any shape and molded, any shape can be obtained, and since both the cement powder and the strength reinforcing member are inorganic, they have the advantage of being resistant to heat.

[Brief explanation of drawings]

FIG. 1 is a flow chart showing an outline of the manufacturing method of the present invention, and FIG. 2 shows an example of an adsorbent manufactured by the manufacturing method of the present invention.

Claims (1)

[Claims] (1) An adsorbent characterized by adding cement powder to a particulate adsorbent whose surface is moderately moistened, kneading it, pouring it into an arbitrary mold, filling it, and drying it to solidify it. Production method.