JPS6287798A - Filler for packed column - Google Patents

Abstract

PURPOSE:To provide filler for a packed column, in which a liquid film is formed on substantially the whole surface of the filler and efficient heat transfer and/or substance transfer is effected, by a method wherein a lyophilic film, containing a high liquid absorbing resin, is formed on the surface of a metallic base material. CONSTITUTION:Lyophilic coating is coated or lyophilic sheet is adhered to form a lyophilic film on the surface of a metallic base material such as stainless steel, aluminum, copper or the like. The coating, used for this purpose, is constituted fundamentally of high liquid absorbing resin, carrier for the coating and organic solvent. High water absorbing resin is preferable to have the water absorption of 20g/g or more from the view point of hydrophilic performance while the average grain size of the same resin is smaller the better and is preferable to be 100mum or less. Upon manufacturing the coating, it is necessary to disperse the high lyophilic resin into the coating. The thickness of the coating film is necessary to be 15mum or larger with respect to the grain size of about 10mum, for example.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a cooling tower, an evaporation tower, an absorption tower, a reaction tower, etc., which are used for packing that performs heat transfer and/or mass transfer between a liquid and a gas. This relates to a metal-based filler to be filled in a column.

[Prior art]

As this type of filler, fillers based on metals such as stainless steel are widely used when heat resistance and chemical stability are required, for example as fillers for cooling towers that cool liquids with air. has been done.

[Problem that the invention seeks to solve]

However, since metals in -FG are not hydrophilic, the surface of metal-based fillers tends to repel water, and it may not be possible to form a sufficient liquid film over the entire surface. There was a problem in that a dry surface appeared, causing unevenness in the heat transfer surface, and that the heat exchange performance was sometimes insufficient.

For example, in the case of a cooling tower, the packing material is formed by a large number of base materials 1 arranged vertically and parallel to each other at intervals, as shown in FIG. The airflow contacts the liquid 4 flowing down the surface of the base material 1, causing evaporation, and at that time, the latent heat of vaporization is taken away and the liquid 4 is cooled and flows out from below. It has become.

When the base material l is made of metal, its surface may easily repel water, and some parts 5 may be dry without getting wet, and a liquid film may not be formed evenly over the entire surface. This has the problem that unevenness occurs, and therefore, sufficient evaporation action is not performed and the cooling effect is impaired.

The present invention solves the above-mentioned problems of the conventional packing material, and provides a packing material for a packed column in which a liquid film is formed on almost the entire surface of the packing material, and efficient heat transfer and/or mass transfer is performed. The purpose is to

[Means for solving problems]

The inventors conducted repeated experiments and research in order to solve the above-mentioned problems, and based on the knowledge obtained at that time, the present invention was made.

As a means to solve the above-mentioned problems of the conventional ones, the present invention provides a filling material that is packed in a packed column and participates in heat transfer and/or mass transfer between a liquid and a gas, and a metal base material. It is an object of the present invention to provide a packing material for a packed tower, characterized in that a m-liquid film containing a highly liquid-absorbent resin is formed on the surface of the packing material.

In the present invention, by having the above configuration, the liquid is retained by the m-liquid film, and the total surface force of the filler is <? At night, it becomes wet, and gas-liquid contact occurs over a wide area over a relatively long period of time, allowing for highly efficient heat transfer and/or rostrum transfer.

In the present invention, metals with high heat resistance and corrosion resistance, such as stainless steel, aluminum, and copper, are used as the metal for forming the filler.

To form a lyophilic film on the surface of a metal substrate, apply a lyophilic paint or paste a lyophilic sheet.
Formed by means such as.

Regarding the m-liquid paint, the paint used in the present invention is basically composed of a highly liquid-absorbent resin, a paint vehicle, and an organic solvent, but if necessary, a reactive diluent, Inorganic fillers, binders, adhesives, various stabilizers, colorants, etc. may be blended.

Here, the highly absorbent temporary resin is not particularly limited, and various conventionally known ones can be used. Specifically, for example, the super absorbent resin is saponified vinyl acetate-acrylic acid ester copolymer. Examples include crosslinked products of modified isobutylene-maleic anhydride copolymers, polyacrylic acid (salts) having a crosslinked structure, and starch-acrylic acid (salt) graft polymers. Polymer compounds containing carboxylic acid salts (e.g., saponified vinyl acetate-methyl acrylate copolymer, cross-linked modified isobutylene-maleic anhydride copolymer) are particularly preferably used because of their excellent durability. Ru.

Only one type of super absorbent resin may be used, and 2+ff
i or more may be used together.

In terms of water absorption performance, these super absorbent resins have a water absorption capacity of 20g.
/g or more, particularly IQOa/g or more, and the smaller the average particle size of the superabsorbent resin is, the more preferable it is, and it is generally more preferable that the average particle size is 100 μm or less, particularly 30 μm or less.

When the average particle size exceeds 100 μm, the superabsorbent resin tends to fall off from the formed coating film.

The liquid in the water song is I8J, which uses water as the main solvent;
Oils, alcohols, etc. are used as liquid absorbents, and for 78 liquids whose main solvent is water, super absorbent resins,
For oils, we use Attacktic polypropylene, for alcohols, we use methanol, super absorbent resins for low molecular weight substances such as ethanol, and for high molecular weight substances, we use Attacktic polypropylene. It will be done.

Furthermore, as the vehicle component of the paint, any material that is compatible or soluble in organic solvents may be used without any particular restriction, such as acrylic resin, polyvinyl chloride, polystyrene, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene- Acrylic acid copolymer, chlorinated polypropylene, chlorinated polyethylene, Evokin resin, urethane resin, Noricon resin,
Examples include unsaturated polyester resin and melamine resin.

In the paint used in the present invention, the blending ratio of each component varies depending on conditions such as the type, shape, and usage method of the filling used, and is not particularly limited. As such, it should be blended at least to the extent that the formed coating 11 has lyophilic properties over a long period of time.

To manufacture such paints, it is necessary to sufficiently disperse the highly liquid-absorbent resin in the paint. If necessary, after mixing the paint components, use a mixing roll, ball mill, homogenizer, paint shaker, etc. to uniformly disperse the resin. distributed.

Any method such as dipping, spraying, roller coating, curtain flow coating, brush coating, roller coating, or electrostatic coating may be selected as a method for applying such paint to the surface of the filler. The choice is made taking into account the type of filler, shape, thickness of the coating, etc.

The thickness of the coating film is determined by the type, shape, usage conditions, etc. of the filler, but in order to prevent the resin particles from falling off, it is not preferable to make the coating film too thin relative to the particle size. For objects, the thickness of the coating is 15 μm.
The thickness is preferably 30 μm.

After coating the coating material, it is preferable to dry the coated surface by conventional drying means such as infrared drying, heated hot air drying, heated roll drying, air drying, and ultraviolet drying.

The above example shows the formation of a film on the surface of a metal base material by coating the surface of the metal base material, but it is also possible to form a lyophilic film by pasting a sheet containing a liquid-absorbing resin on the surface of the base material. Good too.

The present invention provides a lyophilic coating on the surface of a metal base material to retain and form a liquid film over a wide area over the entire surface of the base material, thereby achieving effective gas-liquid contact and heat transfer and/or mass transfer. In addition to being applicable to cooling towers, this technology can be applied to condensation 1i!, which cools and condenses gas using a retained liquid film. Equipment, adsorption equipment that adsorbs solids or liquids onto liquid films, other gas absorption equipment, distillation equipment, evaporation equipment, vacuum stemming equipment, drying equipment, extraction l! a
It can be used in a packed column that performs a diffusion process such as a decomposition device, or a packed column that performs a chemical reaction, to ensure sufficient heat transfer and/or mass transfer.

Heat transfer is not limited to direct heat exchange, but also between primary and secondary fluids.
Indirect heat exchange may be performed without direct contact with the next fluid.

In addition to the above-mentioned water, any other liquid can be used as the substance for the liquid phase, but it is particularly effective for liquids with low surface tension.

In addition to the above-mentioned air, any other gas can be used as the substance in the gas phase.

The shape of the base material may be a flat plate or a corrugated plate, as well as various shapes such as a honeycomb shape, a pipe shape, a rod shape, a metal wool shape, or a Raschig ring shape.

[Example] As an example of the present invention, a cooling tower application will be described with reference to the drawings.

The shape of the base material of the filler is not particularly limited, and may be of various known shapes conventionally used in cooling towers. For example, a base material 1 with a corrugated cross section as shown in FIG. 1 is used. In this case, a lyophilic coating may be formed by coating the entire front and back surfaces of the base material 1 with a paint containing a highly liquid-absorbing resin or by pasting a lyophilic sheet.

In addition, as shown in FIGS. 1 and 2, a lyophilic film 7 is formed in a belt shape on the downward facing part 6 facing downward, and is not formed on the upward facing part 8 facing upward. You may also do so. Although it is easy to form a liquid film of the eL flow 2 of liquid 8 on the upward facing part 8, it is extremely difficult for the liquid to adhere to the downward facing part 6, so a liquid coating 7 is formed with 1 on this part. , to maintain a liquid film on the surface of the filler base material 1, and to facilitate the formation of a flowing liquid film thereon.

In this way, the filling material is uniformly distributed over the entire surface of the base material 1 (
・It makes it possible to come into contact with the upwardly moving air 3 over a wide area for a relatively long time, producing a sufficient evaporation effect and producing an extremely large cooling effect.

FIG. 3 shows another example, in which a lyophilic coating film is formed on the surface of the base material 1 using a paint containing a highly liquid-absorbing resin with many spots 9.
It may also be formed as Even if the surface of the metal base material 1 is exposed during such partial application, when a cooling tower is used, a liquid film will form on areas other than the lyophilic spots due to the surface tension of the liquid. is formed continuously, and a liquid film can be formed on almost the entire surface of the base material 1, and a highly efficient cooling effect can be brought about.

(Effects of the Invention) According to the present invention, even though a metal base material with insufficient hydrophilicity is used, it is possible to form a uniform and continuous liquid film over the entire surface of the base material of the filler, resulting in high performance. It is possible to provide a packing material for a packed column that can perform heat transfer and/or mass transfer of 200 to 3000 yen, which has extremely great practical effects.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a partial cross-sectional view taken along a vertical plane, Fig. 3 is a perspective view of another embodiment, and Fig. 4 is a perspective view of a conventional example. . 1... Base material, 2... Liquid flow, 3... Air flow, 4...
Liquid, 5... Dry part, 6... Downward part, 7
...Lyophilic film, 8...Upward part, 9...Spots. Patent applicant: Ebara Research Institute, Inc.
Sumitomo Chemical Co., Ltd. Shinwa Sangyo Co., Ltd. Figure 4

Claims (1)

[Claims] 1. In a packing material packed in a packed tower and participating in heat transfer and/or mass transfer between a liquid and a gas, a highly liquid-absorbing resin is coated on the surface of a metal base material. A packing material for a packed tower, characterized by forming a lyophilic film containing the lyophilic coating.