JP5385101B2 - Deodorization device - Google Patents

Description

  The present invention relates to a formaldehyde remover and a deodorizing apparatus that removes formaldehyde by the formaldehyde remover.

  In general, formaldehyde emitted from a contributor in an anatomy training room and formaldehyde used for formaldehyde fumigation in a sterile room such as a pharmaceutical factory are harmful to the human body and are also subject to the regulation of specific chemical substance prevention regulations. For this reason, it is necessary to reduce the concentration of formaldehyde in the room to a level that is harmless to the human body, and formaldehyde removers and deodorizers are used.

  As this conventional formaldehyde removing agent and deodorizing device, for example, a citrus plant extract deodorizer mainly composed of glutamic acid as an amino acid composition component contained in an extract extracted from a citrus peel or a plant (see Patent Document 1) , A composition having stabilized redox characteristics by addition of an amino acid having an uncharged polar substituent or a peptide containing the amino acid (see Patent Document 2), and formaldehyde contained in contaminated air sucked by an air blower An autopsy table (see Patent Document 3) equipped with a dissolution and collection type air purifier that dissolves and collects other harmful gases in water, hypohalite such as sodium hypochlorite, caustic potash or caustic soda Electrolysis produced by electrolyzing an aqueous solution of alkaline electrolyte such as salt, potassium chloride, sodium bromide, potassium bromide, etc. Deodorizers (see Patent Document 4) that remove malodors, smoke, and harmful substances from exhaust or smoke by bringing them into contact with exhaust or smoke, and alkaline electrolytes such as caustic soda and sodium chloride, potassium chloride, sodium bromide, etc. Electrolysis of salt electrolyte aqueous solution with an electrolyzer without diaphragm, and contact with the generated alkaline electrolyzed sterilized water and air sucked from indoor units such as air conditioners, making it difficult to decompose carbon monoxide, nicotine, etc. in the air Air purification equipment (see Patent Document 5) that oxidizes, decomposes and removes harmful substances, and kills harmful microorganisms such as bacteria, fungi, and viruses, and an enzyme containing formaldehyde-degrading enzyme is immobilized on a carrier whose surface is modified with amino groups Known formaldehyde removing agents (see Patent Document 6) and the like are known.

JP 2001-87366 A JP-T-2006-507378 JP 2007-244762 A JP 2004-290713 A Japanese Patent Laid-Open No. 2003-250876 JP 2005-131567 A

  However, the inventions described in Patent Document 1 and Patent Document 2 described above have a problem that it is difficult to improve the removal performance of formaldehyde because an aqueous solution mainly composed of amino acids is used.

  Further, in the invention described in Patent Document 3, since formaldehyde is collected by simply dissolving it in water, there is a problem that the efficiency of capturing formaldehyde is low, and a desired amount of formaldehyde is captured unless the apparatus is enlarged. There were problems such as being unable to gather.

  Furthermore, in the inventions described in Patent Document 4 and Patent Document 5 described above, electrolyzed water generated by electrolyzing an aqueous solution of an alkaline electrolyte and a salt electrolyte is used. There was a problem that it was almost as low as. Furthermore, since this electrolyzed water contains or produces chemical substances harmful to the human body such as chloride ions (chlorine ions) and chlorine gas for sterilization, it is difficult to use in living spaces for safety reasons. There was also.

  Furthermore, the above-described invention described in Patent Document 6 has a problem in that the performance of removing formaldehyde decreases with the passage of time of use.

  Moreover, in the conventional deodorizing apparatus, the chemical tank for storing or circulating the formaldehyde removal agent and the metal part of the piping system are corroded by the Maillard reaction, or the active ingredient of the formaldehyde removal agent is lost due to the scattering of the formaldehyde removal agent. There is also a problem that the reaction product may enter the room.

  The present invention has been made to solve the above-described problems, and has high formaldehyde removal performance, can maintain stable removal performance over a long period of time, is highly safe, and can be used in a living space. Furthermore, it is intended to provide a formaldehyde removing agent and a deodorizing apparatus that can prevent corrosion of metal parts of chemical baths and piping systems and invasion of reaction products into the room. is there.

  In order to achieve the above-described object, the formaldehyde removing agent according to the present invention is characterized by being composed of an alkaline aqueous solution having an amino acid as a main component and having a pH of 9 or more.

  The formaldehyde removing agent according to the present invention is glycine, alanine, arginine, asparagine, aspartic acid, glutamine, glutamic acid, histidine, isoleucine, leucine, lysine, methionine, serine, threonine, valine, or a mixture thereof. And an amino acid selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate, trisodium phosphate, or a substance selected from the group consisting of mixtures thereof, and water. All other constituents are preferably those used in food additives.

  In addition, the deodorizing apparatus according to the present invention includes a formaldehyde removing section that removes formaldehyde contained in the gas by bringing the formaldehyde removing agent into contact with the gas to be treated by an air washer method.

  In the deodorizing apparatus according to the present invention, the formaldehyde removal section includes a chemical bath for storing the formaldehyde remover, a liquid contact portion for bringing the formaldehyde remover into contact with the gas, the chemical bath and the contact portion. A circulation pump and a circulation pipe for circulating the formaldehyde removal agent between the liquid part, and the chemical tank, the liquid contact part, the circulation pump and the circulation pipe are made of stainless steel, galvalume steel, or cationic electrodeposition It is preferably formed of coated iron, aluminum or resin.

  Furthermore, in the deodorizing apparatus according to the present invention, it is preferable that a water washing section for preventing scattering of the formaldehyde removing agent from the formaldehyde removal section is provided on the downstream side of the formaldehyde removal section.

  According to the present invention, by using a formaldehyde remover mainly composed of an amino acid and having an alkaline pH of 9 or more as a main component, the reaction efficiency of the amino group of the amino acid and formaldehyde is improved. Formaldehyde removal performance can be enhanced. Moreover, since the removal efficiency of formaldehyde is improved by using a formaldehyde removing agent having high formaldehyde removal performance, the deodorization apparatus can be downsized.

  Furthermore, the amino acid which comprises a formaldehyde removal agent, and the substance added to this amino acid can be used also in a living space by making into a safe substance for the human body currently used for the food additive.

  Furthermore, since the formaldehyde removing agent is always replenished to the wetted part by circulating the formaldehyde remover between the chemical tank and the wetted part, the removal performance is stable over a long period of time. Can be maintained.

  Furthermore, by forming the chemical tank, liquid contact part, circulation pump and circulation pipe of the formaldehyde removal section with stainless steel or galvalume steel or iron, aluminum or resin with cationic electrodeposition coating, the chemical liquid tank, liquid contact part, It is possible to prevent the circulation pump and the circulation piping from being corroded by the Maillard reaction.

  Furthermore, by providing a water washing section on the downstream side of the formaldehyde removal section, the formaldehyde removal agent splash from the formaldehyde removal section can be received by the water washing section, thereby reducing the loss of formaldehyde removal agent and A reduction in the removal rate can be prevented, and the reaction product can be prevented from entering the room.

It is a schematic diagram which shows the deodorizing apparatus which concerns on embodiment of this invention. It is a figure which shows the relationship between the sodium carbonate input amount and pH, and the removal rate of formaldehyde when formaldehyde is removed with the formaldehyde remover which supplied sodium carbonate to the glycine solution. It is a figure which shows the relationship between the glycine input amount when a formaldehyde is removed with a glycine solution, and the removal rate of formaldehyde. It is a figure which shows the relationship between the experiment time when formaldehyde is removed using the deodorizing apparatus which concerns on embodiment of this invention, and the removal rate of formaldehyde. It is a schematic diagram which shows the conventional deodorizing apparatus. It is a figure which shows the relationship between the experiment time when formaldehyde is removed using the conventional deodorizing apparatus, and the removal rate of formaldehyde.

  Hereinafter, a deodorizing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a deodorizing apparatus according to an embodiment of the present invention. In this deodorizing apparatus 10, a dust filter is installed in the chamber 11 in order from the upstream side in the direction of the flow of air to be treated. 12, a formaldehyde removing section 13, a water washing section 14, and a blower 15 are disposed.

  The formaldehyde removal section 13 includes a chemical tank 16 for storing a formaldehyde remover and a gas-liquid contact medium 17 for bringing the formaldehyde remover into contact with the air in a plurality of stages (two stages in the figure). A wetted part and a circulation pump 18 and a circulating pipe 19 for circulating the formaldehyde removing agent between the wetted part and the chemical tank 16 are removed, and formaldehyde contained in the air is removed by an air washer method. It is supposed to be.

  The chemical solution tank 16, the gas-liquid contact medium 17, the circulation pump 18 and the circulation pipe 19 of the formaldehyde removal section 13 are made of stainless steel, galvalume steel, iron, aluminum or resin coated with cationic electrodeposition. The chemical tank 16, the gas-liquid contact medium 17, the circulation pump 18 and the circulation pipe 19 can be prevented from being corroded by the Maillard reaction.

  The water washing section 14 includes a water washing medium 20, a water supply pipe 21 that supplies water to the water washing medium 20 from above, and a waste water from the water washing medium 20 that is returned to the chemical tank 16 and a valve (not shown). ) And a drain pipe 22 for discharging to the outside by switching, and the water washing medium 20 receives the scattering of the formaldehyde removing agent from the formaldehyde removing section 13.

  The formaldehyde removing agent is composed of an aqueous solution mainly composed of an alkaline amino acid having a pH of 9 or more, preferably glycine, alanine, arginine, asparagine, aspartic acid, glutamine, glutamic acid, histidine, isoleucine, leucine, An amino acid selected from the group consisting of any one of lysine, methionine, serine, threonine, and valine, or a mixture thereof, any one of sodium carbonate, sodium bicarbonate, potassium carbonate, trisodium phosphate, or these It is comprised by adding the substance selected from the group which consists of a mixture, and all these various amino acids and the substance added to this amino acid are substances safe to the human body currently used for the food additive.

  In the deodorizing apparatus 10 having such a configuration, the air to be treated introduced into the chamber 11 by driving the blower 15 is first removed from the dust by the dust removing filter 12 and then the formaldehyde removing section 13. Enter.

  In the formaldehyde removal section 13, the formaldehyde removal agent is pumped up from the chemical tank 16 by the circulation pump 18, dropped from above through the circulation pipe 19 to each gas-liquid contact medium 17, and the surface of each gas-liquid contact medium 17. A liquid film of the formaldehyde removing agent is formed. When the air passes through the gas-liquid contact medium 17 having a liquid film formed on the surface in this way, the air and the formaldehyde removing agent come into gas-liquid contact, and formaldehyde contained in the air is converted into the formaldehyde removing agent. Dissolved in and removed. Meanwhile, the formaldehyde removing agent in which formaldehyde is dissolved is dropped into the chemical tank 16 and returned.

  The air that has passed through the formaldehyde removal section 13 then enters the water wash section 14. In the water cleaning section 14, water is dropped from above onto the water cleaning medium 20 through the water supply pipe 21, and a water film is formed on the surface of the water cleaning medium 20. Then, when the air passes through the water cleaning medium 20, the air and the water come into gas-liquid contact, and the formaldehyde removing agent remaining or crystallized in the air is removed, and the cleaned air is put into the room. Is sent out. On the other hand, water containing a formaldehyde removing agent remaining or crystallized in the air is returned to the chemical solution tank 16 through the drain pipe 22.

  In this way, in the water washing section 14, the formaldehyde removal agent scattered from the formaldehyde removal section 13 is received by the water washing medium 20, and the recovered formaldehyde removal agent is returned to the chemical tank 16, thereby reducing the loss of the formaldehyde removal agent. As a result, the formaldehyde removal rate can be prevented from being lowered, and the reaction product can be prevented from entering the room.

FIG. 2 shows the amount of sodium carbonate input and the pH and formaldehyde removal rate when formaldehyde was removed with a formaldehyde remover in which sodium carbonate was added to a glycine solution in an experiment using the deodorizing apparatus 10 according to the embodiment of the present invention. It is a figure which shows the relationship. In this experiment, the formaldehyde concentration at the inlet of the deodorizing apparatus 10 is 0.25 ppm, the air treatment air volume is 810 m ³ / h, the capacity of the chemical tank 16 is 20 liters, the amount of glycine charged is 300 g, While the circulation flow rate was set to 1.0 liter / min and the input amount of sodium carbonate was changed to 0 g, 10 g, 100 g, and 300 g, the one-pass removal rate of formaldehyde after 1 hour operation of the deodorizer 10 was measured.

  As a result, as shown in FIG. 2, when sodium carbonate was not added (in the case of 0 g), the pH was 7 and the one-pass removal rate of formaldehyde was 80%, whereas 10 g of sodium carbonate was added. When the pH is about 9, the one-pass removal rate of formaldehyde rises to about 88%. When 100 g and 300 g of sodium carbonate are added, the pH is 10 or more and the one-pass removal rate of formaldehyde is about 96. % Further increased.

On the other hand, FIG. 3 is a diagram showing the relationship between the amount of glycine input and the removal rate of formaldehyde when formaldehyde is removed with a glycine solution containing only glycine in the deodorizing apparatus 10. In this experiment, the formaldehyde concentration at the inlet portion of the deodorizing apparatus 10 is 0.25 ppm, the air treatment air volume is 810 m ³ / h, the capacity of the chemical tank 16 is 20 liters, and the circulation flow rate of the glycine solution is 1.0 liter / min. And the amount of glycine charged was changed to 0 g, 25 g, 100 g, 250 g, 300 g, and 500 g, and the one-pass removal rate of formaldehyde after 1 hour operation of the deodorizing apparatus 10 was measured.

  As a result, as shown in FIG. 3, the one-pass removal rate of formaldehyde was 30% when glycine was not added (in the case of 0 g), whereas it was about 60% when 20 g of glycine was added. Was increased to about 70% when 100 g of glycine was added. However, when 250 g, 300 g, and 500 g of glycine were added, all were about 80%. There was no change. In addition, when the amount of glycine input is 300 g, one-pass removal of formaldehyde is also performed when only the circulation flow rate of the glycine solution is changed to 0.5 liter / min and 5.0 liter / min under the same conditions as above. The rate was almost the same (80%).

  Thus, comparing the experimental results shown in FIG. 2 and the experimental results shown in FIG. 3, the one-pass removal rate of formaldehyde is higher than that in the case of using a glycine solution containing only glycine. It can be seen that the use of the added formaldehyde remover is higher, and the formaldehyde remover has a significantly higher one-pass removal rate when the pH of the formaldehyde remover is 9 or more.

This is because the carboxyl group (COOH) of glycine (molecular formula is C ₂ H ₅ NO ₂ , molecular weight is 75.07) is in a stable state as shown in the following general formula (1) under neutrality. Under alkalinity, the amino group remains in an ionized state as shown by the following general formula (2), and the efficiency of chemical bonding between the amino group and formaldehyde is improved.

図４は、本発明の実施の形態に係る脱臭装置を使用してホルムアルデヒドを除去した時の実験時間とホルムアルデヒドの除去率との関係を示す図である。この実験では、脱臭装置１０の入口部分でのホルムアルデヒド濃度を０．２５ｐｐｍ、空気の処理風量を３２４０ｍ^３／ｈ、気液接触メディア１７での面風速を２．５ｍ／ｓに設定し、脱臭装置１０を３００時間以上運転させて実験を行い、その間のホルムアルデヒドのワンパス除去率を測定した。

FIG. 4 is a diagram showing the relationship between the experiment time and the removal rate of formaldehyde when formaldehyde is removed using the deodorizing apparatus according to the embodiment of the present invention. In this experiment, the formaldehyde concentration at the inlet of the deodorizing apparatus 10 is set to 0.25 ppm, the air treatment air volume is set to 3240 m ³ / h, and the surface wind speed at the gas-liquid contact medium 17 is set to 2.5 m / s. 10 was operated for 300 hours or more, and the one-pass removal rate of formaldehyde was measured during that time.

  As a result, as shown in FIG. 4, during this experiment, the one-pass removal rate of formaldehyde always showed a value of 80% or more, and the one-pass removal rate of formaldehyde after the experiment time of 334 hours was 88%. there were.

On the other hand, in FIG. 6, as shown in FIG. 5, a dust removal filter 3, a two-stage chemical impregnated activated carbon 4, and a blower 5 are arranged in the chamber 2 in order from the upstream side along the direction of the air to be treated. It is a figure which shows the relationship between the experimental time when formaldehyde is removed using the conventional deodorizing apparatus 1, and the removal rate of formaldehyde. In this experiment, the formaldehyde concentration at the inlet of the deodorizing apparatus 10 is 0.25 ppm, the air treatment air volume is 40.5 m ³ / h, the surface wind speed with the chemical impregnated activated carbon 4 is 0.5 m / s, and the SV value (Space Velocity (space velocity) was set to 60000 / h, and this deodorizing apparatus 1 was operated for 100 hours or more to conduct an experiment, and the one-pass removal rate of formaldehyde during that time was measured.

  As a result, as shown in FIG. 6, the one-pass removal rate of formaldehyde starts to decrease after the experiment time exceeds 80 hours, and the one-pass removal rate of formaldehyde is 70% when the experiment time has passed 106 hours. It decreased to the following (68%).

  Thus, comparing the experimental results shown in FIG. 4 and the experimental results shown in FIG. 6, the one-pass removal rate of formaldehyde when the deodorizing apparatus 10 according to the embodiment of the present invention is used is the passage of experimental time. In spite of the fact that the value is high, the one-pass removal rate of formaldehyde when the conventional deodorizing apparatus 1 is used gradually decreases with the passage of the experiment time. Moreover, the one-pass removal rate of formaldehyde by the deodorizing apparatus 10 according to the embodiment of the present invention is the chemical impregnated activated carbon 4 in the case where the surface wind speed (2.5 m / s) at the gas-liquid contact medium 17 is the conventional deodorizing apparatus 1. In spite of being set to 5 times the surface wind speed (0.5 m / s), the one-pass removal rate before the one-pass removal rate of formaldehyde in the conventional deodorizer 1 starts to decrease is almost the same. I understand.

  As described above, according to the formaldehyde removing agent and the deodorizing apparatus 10 according to the above-described embodiment, by using the formaldehyde removing agent mainly composed of an alkaline amino acid having a pH of 9 or more, the amino group of the amino acid and the formaldehyde are removed. Since the reaction efficiency is improved, the removal performance of formaldehyde can be enhanced. Moreover, since the removal efficiency of formaldehyde is improved by using a formaldehyde removal agent having high formaldehyde removal performance, the deodorization apparatus 10 can be downsized.

  Furthermore, since the amino acid which comprises the said formaldehyde removal agent, and the substance added to this amino acid are all safe substances for the human body used for the food additive, the use in living space is also possible.

  Furthermore, since the formaldehyde removing agent is constantly supplied to the gas-liquid contact medium 17, stable removal performance can be maintained over a long period of time.

DESCRIPTION OF SYMBOLS 10 Deodorizing device 13 Formaldehyde removal section 14 Water washing section 16 Chemical solution tank 17 Gas-liquid contact medium (wetted part)
18 Circulation pump 19 Circulation piping

Claims (3)

Consists of an alkaline aqueous solution having an amino acid as a main component and having a pH of 9 or higher. In a glycine solution containing only glycine and having a concentration of 167 mmol / liter or more, the sodium carbonate concentration is 4.7 mmol / liter or more. the so as formaldehyde removing agent that consists by addition of sodium carbonate comprises formaldehyde removal section for removing formaldehyde contained in contact with the gas to be processed in an air washer system in the gas, the formaldehyde scavenging agent deodorizing device the mass ratio between the flow rate of the circulation flow rate and the gas of the processing target is characterized der Rukoto 0.03 or more. The formaldehyde removal section includes a chemical bath for storing the formaldehyde remover, a liquid contact portion for bringing the formaldehyde remover into contact with the gas, and the formaldehyde remover between the chemical bath and the liquid contact portion. A circulation pump and a circulation pipe for circulating the liquid, and the chemical bath, the liquid contact part, the circulation pump and the circulation pipe are formed of stainless steel, galvalume steel, iron, aluminum or resin coated with cationic electrodeposition. The deodorizing apparatus according to claim 1 . Wherein downstream of formaldehyde removal section, deodorizing apparatus according to claim 1 or 2 water wash section is found provided for preventing scattering of the formaldehyde removing agent from the formaldehyde removal section.

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