JPS6348546B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an indoor sterilization method and an indoor sterilization apparatus used for carrying out the method.

[Conventional technology]

Conventional indoor sterilization methods include, for example, sterilization by circulating formaldehyde gas indoors (Masayoshi Furuhashi, "Practical Sterilization and Disinfection Methods", 1st edition, 4th printing, 1981, Nippon Iji Shinposha), etc. It is being done.

[Problem that the invention seeks to solve]

However, this conventional method using formaldehyde gas has drawbacks in terms of the method of vaporizing formalin and the method of neutralizing formaldehyde gas.

In other words, formaldehyde gas can be obtained by heating and vaporizing a commercially available formalin solution (containing 35-38% formaldehyde and 10-15% methanol), or by directly spraying it, or by impregnating a filter paper with formalin solution and blowing with hot air. This is carried out by methods such as vaporization, but these methods have problems such as concentrating the formalin solution and producing paraform in the liquid phase, and low vaporization efficiency, such that vaporization takes a long time.

Regarding neutralization and removal of formaldehyde gas, it is generally done to generate less toxic hexamethylenetetramine by spraying or vaporizing ammonia water and reacting with formaldehyde in the air, but this method is simply Since this is a neutralization reaction and the product is not removed from the system, there is a drawback that the produced hexamethylenetetramine adheres to walls, equipment, glass, etc. Furthermore, the following reaction formula 4NH ₃₊
As seen in 6HCHO→C ₆ H ₁₂ N ₄ +6H ₂ O,
The theoretical amount required for neutralization is 68 g of ammonia per 30 g of formaldehyde, but formaldehyde forms relatively stable crystals as paraformaldehyde in the air, or is absorbed by water droplets, etc., and adheres to walls and floors. Therefore, the absolute amount in the air is less than the actual amount of vaporization, and the concentration decreases over time, making it extremely difficult to determine the optimal amount of ammonia for neutralization, and with conventional equipment of this type. After the operation was completed, it was often difficult to continue working indoors due to large amounts of formaldehyde remaining or, conversely, the smell of ammonia.

[Means for solving problems]

The present invention was made as a result of various studies in order to improve the drawbacks of the conventional sterilization method, and includes a blower that circulates indoor air, a heater that heats the indoor air to a constant temperature, A vaporizer equipped with an ultrasonic generator and connected to a water supply device and a formalin supply device to vaporize water and formalin supplied from the water supply device and formalin supply device; and a formaldehyde adsorption device containing a formaldehyde adsorption agent. Using an indoor sterilizer equipped with a switching valve that supplies or shuts off water and formalin vaporized by a vaporizer to a formaldehyde absorber equipped with a formaldehyde absorbent, indoor air is supplied to a heater using a blower. Then, the heated air circulating in the room is sent to a vaporizer equipped with an ultrasonic generator, and water and formalin are supplied into the vaporizer to vaporize it. This vaporized water and formalin are refluxed and circulated indoors, and after repeating this circulation to sterilize the room, the sterilized indoor air is sent to a formaldehyde absorber containing a formaldehyde absorbent using a blower. By circulating the formaldehyde remaining in the room and adsorbing it on the formaldehyde adsorbent, the room is sterilized and at the same time the formaldehyde remaining in the room is removed.Therefore, less paraform is produced, and formalin is efficiently vaporized and stored indoors. In addition to being well sterilized,
This method improves the drawbacks of the conventional sterilization method by removing residual formaldehyde from the room without neutralizing it with ammonia or the like.

Hereinafter, an explanation will be given with reference to the indoor sterilizer of the present invention and the drawings.

As shown in FIG. 1, the indoor sterilizer according to the present invention has a blower 2 attached to the lower end of a duct 1 standing upright in the center, a heater 3 attached to the upper part of the duct 1, and an inlet 4 of the blower 2. The indoor air taken in from the heater 3 is sent into the duct 1, and
It is heated by the duct 1 and blown into the room from the outlet 5 of the duct 1. Reference numeral 6 denotes a vaporizer disposed adjacent to the blower 2, and a duct 7 is installed above the vaporizer 6 to guide water and formalin vaporized by an ultrasonic generator built into the vaporizer 6. Connected to duct 1. A formalin supply device 8 is also connected to the vaporizer 6 via a metering tank 9 via a supply pipe 10, and at the same time a water supply device 11 is connected via a supply pipe 12. Reference numeral 13 denotes a fan for blowing air into the vaporizer 6 attached to the vaporizer 6. The heated air in the room is taken into the vaporizer 6 from the fan 13 for blowing air into the vaporizer, and is supplied from the water supply device 11 and the formalin feed device 8. The water and formalin are sequentially vaporized by an ultrasonic generator in the vaporizer 6, and are sent to the duct 1 via the duct 7.

Reference numeral 14 denotes a formaldehyde absorber attached to the left half of the upper end of the duct 1, which contains formaldehyde adsorbent, and the switch valve 1 is attached to the switch valve support 15 attached to the outer wall of the duct 1.
6 is supported, and the switching valve 16 is operated by the linear motor 17. If the formaldehyde adsorber 14 is not used to adsorb formaldehyde, slide the switching valve 16 to the left as shown in FIGS. Then,
The air inside the duct 1 is transferred to the formaldehyde absorber 14
If formaldehyde is to be adsorbed by the formaldehyde absorber 14 without passing through the inside, slide the switching valve 16 to the right as shown in FIGS. 3 and 5.
6 Place the cover 18 on the tip of the formaldehyde absorber 1
The air in the duct 1 is made to pass through the formaldehyde absorber 14 and circulate there. Reference numeral 19 denotes a guide plate for guiding the cover 18 at the tip when the switching valve 16 is slid.

Therefore, when sterilizing a room using this indoor sterilizer, first, indoor air is taken in from the suction port 4 of the blower 2 and sent into the duct 1. The air in the room is heated to a constant temperature of 20°C or higher by being recirculated into the room from the outlet 5 of the duct 1 and maintained there.
In this way, by heating and maintaining the indoor temperature at a constant temperature with the heater 3, the indoor sterilization effect is enhanced. Next, the air heated and held at a constant temperature in the room is taken into the vaporizer 6 by the vaporizer blowing fan 13, and at the same time, water is supplied from the water supply device 11 to the vaporizer 6 via the supply pipe 12, First, water is vaporized using an ultrasonic generator installed inside the vaporizer 6, and the humidity in the room is adjusted to 60 to 80%.
Furthermore, formalin is supplied from the formalin supply device 8 to the vaporizer 6 via the measuring tank 9 and the supply pipe 10, and the formalin is heated using an ultrasonic generator installed in the vaporizer 6, so that the amount of vaporized formalin is 37% of the indoor volume. Vaporize at a rate of 8 to 16 ml/m ³ . The water and formalin thus vaporized are transferred to the vaporizer 6.
Air is sent to the duct 1 through the duct 7 installed above, heated by the heater 3 together with indoor air sent by the blower 2, and circulated indoors. This circulation performs sterilization, and the circulation is repeated until the room is completely sterilized. After the room has been completely sterilized, the switching valve 16 supported by the switching valve support 15 attached to the outer wall of the duct 1
is slid to the right by the linear motor 17 as shown in FIGS. 3 and 5, and the switching valve 16
The tip cover 18 is attached to the formaldehyde absorber 14.
The air inside the duct 1 is made sure to pass through the formaldehyde adsorber 14 and circulated, and formaldehyde contained in the indoor air is adsorbed by the formaldehyde adsorber built in the formaldehyde adsorber 14. By repeating this circulation, unnecessary formaldehyde is completely adsorbed and removed from the air in the room after sterilization. Therefore, if the indoor sterilizer of the present invention is used to sterilize a room, it is possible to sterilize the room and at the same time remove formaldehyde remaining in the room, produce less paraform, and efficiently vaporize formalin. The room can be sterilized effectively. In addition, residual formaldehyde is removed from the room without being neutralized with ammonia, etc., so even if you have to work indoors for a long time, such as in an operating room, you can continue working indoors for a long time without any problems. It can be done continuously for hours.

Here, since the vaporization of water and formalin in the vaporizer 6 is performed by an ultrasonic generator built into the vaporizer 6, water and formalin can be vaporized quantitatively and in a short time, and the vaporization efficiency is is extremely good. The frequency of this ultrasonic generator is 20KHz~
A 2000KHz device can be used, but a speed of 200KHz or higher is preferable in consideration of vaporization efficiency.The order of vaporization using this ultrasonic generator is to first vaporize only water, provide a certain level of humidity, and then quantitatively vaporize formalin. The sterilizing effect can be improved by allowing air to circulate for a certain period of time.

Further, as the formaldehyde adsorbent to be installed in the adsorber 14, one in which 1 mole or more of an aromatic or aliphatic primary to secondary amine is impregnated per 1 kg of activated carbon is preferably used. For example, activated carbon is added to an aqueous aniline solution. Activated carbon impregnated with aniline is used after soaking, filtering, and drying.
In this case, the amount of aniline impregnated is preferably 10% or more by weight of activated carbon, and if the amount supported is less than this, it is difficult to completely remove formaldehyde. In addition to such aniline, aromatic or aliphatic 1-2 impregnated with activated carbon
The appropriate amount of the secondary amine is 1 to 3 moles per kg of activated carbon.

〔Example〕

Next, embodiments of the invention will be described.

Example 1 Using the indoor sterilizer shown in Figure 1, indoor air was blown into the duct 1 by the blower 2 with a blowing capacity of 6N-m ³ × 2mH ₂ O, and heated by the heater 3 above the duct 1. The heating was adjusted so that the room temperature was 20 to 25°C. Next, indoor air heated to 20 to 25°C is sent to a vaporizer 6 equipped with an ultrasonic generator with a vaporization capacity of 800 mlH ₂ O/hr, and water is supplied from a water supply device 11 to generate ultrasonic waves. Frequency used by sound wave generator
Vaporizes water at 1700KHz, indoor humidity is 70-75%RH
At the same time, add a commercially available formalin solution (formaldehyde) from the formalin supply device 8.
(containing 37%) was supplied at a constant rate of 10 ml/m ³ and vaporized at a frequency of 1700 KHz used by an ultrasonic generator, air was sent into duct 1 through duct 7, and circulated indoors. Next, by operating the switching valve 16, the room air sterilized in the above operation is mixed with 20% aniline (by weight) of granular activated carbon with a particle size of 1 to 3 mm.
The air is circulated through a formaldehyde adsorbent 14 equipped with a formaldehyde adsorbent 2 impregnated with
Formaldehyde remaining in the room was adsorbed.
This operation was repeated for 5 hours or more to sterilize the room and remove residual formaldehyde.

When the room was sterilized and the remaining formaldehyde was removed in this way, the relationship between the circulation time and the concentration of formaldehyde remaining in the room was investigated. FIG. 6 shows this relationship in a graph. Graph A shows the case where the room is sterilized and residual formaldehyde is removed.
Graph B shows the case where indoor sterilization was performed without using a formaldehyde absorber. Note that the concentration of formaldehyde remaining in the room was measured using FID gas chromatography.

〔Effect of the invention〕

As is clear from the graph in FIG. 6, the method of the present invention using the indoor sterilizer of the present invention (graph A)
Then, after 6 hours of circulation time, the formaldehyde concentration will be
The amount of formaldehyde remaining in the room decreased to 1.5 ppm, and aniline was also measured and was below the detection limit, compared to when indoor sterilization was performed without using a formaldehyde absorber (Graph B). Therefore, according to the method of the present invention using the indoor sterilizer of the present invention, the room can be sterilized well without leaving formaldehyde, and long-term indoor work can be performed in a sanitary and good manner. It can be done under the environment.

Furthermore, in the method of the present invention, no foreign matter adheres to the walls or glass of the room after all operations are completed, and it is found that the method is an exceptionally clean and reliable indoor sterilization method compared to the conventional ammonia neutralization method.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of the indoor sterilizer of the present invention, Figs. 2 and 3 are enlarged vertical sectional views of the main parts of the same indoor sterilizer, and Figs. 4 and 5 are enlarged partial cutaways of the same main parts. The cross-sectional view, Figure 6, shows the case when indoor sterilization and residual formaldehyde are removed.
It is a relationship diagram showing the relationship between circulation time and the concentration of formaldehyde remaining indoors. 1, 7...Duct, 2...Blower, 3...Heater, 6
... Vaporizer, 8... Formalin supply device, 11... Water supply device, 14... Formaldehyde adsorption device, 16...
switching valve.

Claims (1)

[Claims] 1. Indoor air is sent to a heater using a blower, and then returned to the room for circulation.Then, the heated air circulating in the room is sent to a vaporizer equipped with an ultrasonic generator. Along with supplying air, water and formalin are supplied into the vaporizer and vaporized, and the vaporized water and formalin are returned and circulated indoors. After repeating this circulation and sterilizing the room, the sterilized indoor Using a blower, the air is circulated through a formaldehyde adsorbent equipped with a formaldehyde adsorbent, and the formaldehyde remaining in the room is adsorbed by the formaldehyde adsorbent, thereby sterilizing the room and simultaneously removing the formaldehyde remaining in the room. An indoor sterilization method characterized by: 2. A blower that circulates indoor air, a heater that heats indoor air to a certain temperature, and an ultrasonic generator, and is connected to a water supply device and a formalin supply device, and is connected to the water supply device and formalin supply device. A vaporizer that vaporizes water and formalin supplied from the vaporizer, a formaldehyde adsorber that contains a formaldehyde adsorbent, and a formaldehyde adsorbent that supplies or shuts off the water and formalin vaporized by the vaporizer to the formaldehyde adsorbent that contains a formaldehyde adsorbent. When sterilizing a room, the switch valve is used to sterilize the room by sending the water and formalin vaporized by the vaporizer together with the heated indoor air sent from the blower to the heater. This indoor sterilizer is characterized in that after indoor sterilization, the sterilized air is circulated by a blower to a heater and a formaldehyde adsorbent equipped with a formaldehyde adsorbent.