JP5611657B2 - Hydrogen sulfide gas removing agent, method for detecting hydrogen sulfide gas using the same, and hydrogen sulfide gas removing apparatus - Google Patents

Description

  The present invention relates to a hydrogen sulfide gas removing agent, a method for detecting hydrogen sulfide gas using the same, and a hydrogen sulfide gas removing apparatus.

  Hydrogen sulfide has a unique harmful odor and is legally treated as a malodorous substance. Since hydrogen sulfide corrodes and degrades metals and concrete, conventionally, treatment by an adsorption method using various adsorbents such as activated carbon (see, for example, Patent Documents 1-3), treatment by an oxidation method using ozone or oxygen, and biological Processing is performed. However, the treatment by the adsorption method has a small treatment capacity and is limited to a low concentration of several thousand ppm or less, and several ppm untreated due to the adsorption characteristics. In the treatment by the oxidation method and biological treatment, the treatment capacity is large but the treatment speed is slow, and the untreated gas flows out. Therefore, the venturi scrubber or the like is cleaned as a final treatment. For this reason, it is necessary to always grasp the treatment status and confirm the presence or absence of hydrogen sulfide. In addition, these conventional processes have not been able to realize an immediate and rapid process from a low concentration to a high concentration.

  By the way, what adsorbed alkali metal carbonate on activated carbon is known as an adsorbent by the above-mentioned adsorption method. Since this adsorbent has a large surface temperature increase due to spontaneous heat generation and may cause a fire or other disaster, an adsorbent with basic metal sulfate supported on activated carbon is proposed as an adsorbent that suppresses the increase in surface temperature. (For example, see Patent Document 4). However, since this is manufactured by immersing activated carbon in a metal sulfate solution and then immersing it in an alkali solution, in order to suppress the rise in the surface temperature of the activated carbon due to residual alkali, it is washed with water after immersing the alkali solution. It is necessary to apply. If the washing treatment is not sufficient, the surface temperature of the activated carbon may increase due to residual alkali.

JP 2004-43098 A JP-A-10-192703 JP-A 63-240866 JP 2005-52712 A

  The present invention has been made in view of the circumstances as described above, can be produced by a simple method, and removes and fixes hydrogen sulfide gas ranging from low concentration to high concentration as chemically stable sulfide in a short time. It is another object of the present invention to provide a hydrogen sulfide gas removing agent capable of confirming the presence or absence of hydrogen sulfide gas, a method for detecting hydrogen sulfide gas using the same, and a hydrogen sulfide gas removing apparatus.

  The present invention is characterized by the following in order to solve the above problems.

  First, the hydrogen sulfide gas removing agent of the present invention is characterized in that an iron salt (III) and an alkali are supported and coexisted on a carrier in a molar ratio of iron: alkali = 1: 10 to 1:20. To do.

  Second, in the first invention, the support is alumina, diatomaceous earth, molecular sieve, or zeolite.

  Third, in the first or second invention, the iron salt (III) is at least one selected from iron (III) sulfate, iron (III) nitrate and iron (III) chloride. And

  Fourth, in any one of the first to third inventions, the alkali is at least one selected from sodium or potassium hydroxide, carbonate, phosphate and aluminate. And

  Fifth, the method for producing the hydrogen sulfide gas removing agent of the present invention is such that after bringing an alkali solution into contact with a carrier, the amount of alkali supported is 10 to 20 times that of iron co-supported in a molar ratio. (III) The carrier is allowed to coexist with the iron salt (III) and the alkali by bringing the solution into contact with the carrier.

  Sixth, in the fifth invention, the carrier is alumina, diatomaceous earth, molecular sieve, or zeolite.

  Seventh, there is provided a method for detecting hydrogen sulfide gas using any one of the first to fourth hydrogen sulfide gas removing agents, wherein the iron salt (III) and alkali supported on the hydrogen sulfide gas removing agent The presence or absence of hydrogen sulfide gas is detected by the discoloration of the hydrogen sulfide gas removing agent accompanying the generation of sulfide by a chemical reaction with hydrogen sulfide gas.

  Eighth, a column part filled with any one of the first to fourth hydrogen sulfide gas removing agents, an inlet for introducing air containing hydrogen sulfide gas into the column part, and sulfidation by the column part An exhaust port for exhausting air from which hydrogen gas has been removed and suction means for introducing the air containing hydrogen sulfide into the column portion from the introduction port and exhausting the air from the exhaust port are provided.

  Ninthly, in the eighth invention, the column portion filled with the hydrogen sulfide gas removing agent is a transparent or translucent cylindrical body having an inlet and an exhaust at both ends, and hydrogen sulfide gas by hydrogen sulfide gas. The discoloration of the remover is visible.

  According to the present invention, a hydrogen sulfide gas removing agent can be efficiently produced by a simple method. Since this hydrogen sulfide gas removing agent is processed by chemisorbing hydrogen sulfide gas, hydrogen sulfide gas ranging from low to high concentration can be quickly adsorbed and removed by a simple method. Moreover, since the hydrogen sulfide gas removing agent of the present invention changes from brown to black due to a chemical reaction with hydrogen sulfide gas, the presence or absence of hydrogen sulfide gas can be detected. Moreover, the breakthrough state is clear. Further, the produced sulfide is chemically stable, and even if it is exposed to air, hydrogen sulfide gas is not regenerated.

It is the schematic of a hydrogen sulfide gas removal apparatus. It is the schematic of a removal agent performance evaluation test apparatus.

  The present invention has the features as described above, and an embodiment of the present invention will be described below.

  The hydrogen sulfide gas removing agent of the present invention (hereinafter also simply referred to as a removing agent) has iron salt (III) and alkali (OH) supported on a carrier at a predetermined ratio. Specifically, the iron salt (III) and the alkali are supported so that the molar ratio of iron (Fe): alkali (OH) = 1: 10 to 1:20. As a result, the stability as a removing agent is improved, the hydrogen sulfide gas can be quickly removed and fixed as a chemically stable sulfide, and the presence or absence of the hydrogen sulfide gas can be detected. For example, when the removal agent of the present invention is brought into contact with air containing hydrogen sulfide gas, the iron salt (III) and alkali on the carrier quickly capture the hydrogen sulfide gas through a chemical reaction, and form a chemically stable sulfide on the carrier. Adsorb and fix. The chemical reaction at this time is presumed to be the following reaction.

^{_{H 2 S + 2OH - → S}} 2- + 2H 2 O (1)
3H ₂ S + 2Fe ^{3+ _{(brown) + 6OH - → Fe 2 S}} 3 ( black) + 6H ₂ O ₍₂₎
The reaction formula (1) is a neutralization reaction between the alkali on the support and the hydrogen sulfide gas. In the present invention, this reaction is presumed to contribute as a main reaction for removing the hydrogen sulfide gas. . The reaction formula (2) is a chemical reaction between the iron salt (III) on the carrier and alkali and hydrogen sulfide gas, and it is assumed that the presence or absence of hydrogen sulfide gas is clarified. Further, since the generated sulfide is a chemically stable sulfide, the hydrogen sulfide gas is not regenerated from the removing agent even when exposed to air.

  As described above, since the removing agent of the present invention collects hydrogen sulfide by a chemical reaction, it can rapidly process hydrogen sulfide in a wide range of 1 ppm to several percent in the air, and the air concentration is reduced to zero ppm. be able to. In addition to hygroscopicity, the reaction amount increases and the reaction rate is high, so that a large amount of hydrogen sulfide can be treated quickly. For example, about 30 liters of 100% hydrogen sulfide per liter of removal agent can be processed. It is also possible to remove hydrogen sulfide by spraying the removing agent of the present invention into hydrogen sulfide-containing air.

  On the other hand, if the supported amount of iron salt (III) and alkali is out of the above range, the above effect cannot be obtained.

  The amount of alkali supported influences the throughput of hydrogen sulfide and the quality of the reaction boundary described later. When the amount of alkali supported is less than 10 times the molar ratio with respect to iron, the amount of hydrogen sulfide treated decreases and the reaction boundary becomes unclear. When the amount of alkali supported exceeds 20 times in terms of molar ratio with respect to iron, the adsorptive capacity deteriorates, the reaction rate becomes slow, and the amount of hydrogen sulfide treated decreases. Moreover, the stability as a removing agent is lacking.

The carrier used in the present invention is not particularly limited as long as it does not inhibit the chemical reaction with hydrogen sulfide and can confirm the color (black) of sulfide (Fe ₂ S ₃ ) generated by the reaction with hydrogen sulfide. It is not something. Inorganic porous carriers are preferably used. Specific examples include activated alumina, molten alumina, diatomaceous earth and the like which are basic (solid base) (hereinafter referred to as basic carriers), molecular sieves, and acidic zeolites. In addition, there can be mentioned those known as general-purpose adsorbents, such as those in which the carrier itself such as acidic clay is acidic (solid acid) (hereinafter referred to as acidic carrier). In addition to the above, as the basic carrier or acidic carrier, those subjected to acid or base treatment during the production of the carrier can be used.

  In the present invention, either a basic carrier or an acidic carrier can be used. In the case of an acidic carrier, a neutralized carrier may be used in advance. The neutralization treatment of the acidic carrier is generally performed in the following steps. First, the acidic carrier is immersed in an alkaline aqueous solution such as 1 to 5% KOH aqueous solution. Next, it is heated to about 80 ° C. and left for 24 hours with occasional stirring. Thereafter, the fine particles are removed by coarse filtration, and the carrier is washed with purified water or the like. This removes excess alkali and neutralized product salts from the support. This washing of the carrier with purified water or the like is performed until it can be confirmed that the washing filtrate is neutralized by pH measurement. Next, after drying is performed at a temperature of about 100 ° C. to remove moisture from the carrier, baking is performed at a temperature range of 200 ° C. to 400 ° C. to convert the hydroxide into an oxide, thereby increasing the adsorption capacity.

The shape of the carrier is not particularly limited, and may be any shape such as a pulverized shape, a spherical shape, a fibrous shape, or a cylindrical shape. As the surface area is larger, a larger amount of iron salt (III) and alkali can be supported, and the treatment amount (removal amount) of hydrogen sulfide can be increased. It is preferable to use a white or light-colored support so that the color (black) of the sulfide (Fe ₂ S ₃ ) generated by the reaction with hydrogen sulfide can be confirmed. From this viewpoint, activated alumina, diatomaceous earth, and zeolite are preferable. In particular, activated alumina is preferable because it is easy to adjust the amount of addition regardless of the type of iron salt (III) or alkali. In addition, this product has a large adsorption capacity and, as will be described later, it is possible to add an iron salt (III) solution without drying after adding an alkali, so that a remover is easily and efficiently produced. be able to. Diatomaceous earth has a small apparent specific gravity and is suitable when a remover is sprayed in the air. Diatomaceous earth can be obtained at low cost. On the other hand, when activated carbon is used as a carrier, the color of the sulfide (black) generated by the reaction with hydrogen sulfide cannot be confirmed, and there is a risk of spontaneous heat generation (surface temperature rise). Activated carbon is not applied as a carrier.

  The iron salt (III) used in the present invention is a water-soluble iron salt (III), and examples thereof include iron (III) sulfate, iron (III) nitrate, and iron (III) chloride. Among these, iron (III) sulfate is preferably used because it is a stable substance that does not undergo hydrolysis and does not undergo thermal decomposition by drying or heating.

The alkali used in the present invention is a hydroxide (Fe (OH) ₃ ) produced by coexistence with the iron salt (III), and a sulfide (Fe ₂ S ₃ ) produced by the alkali retained on the support. And a role of fixing it to the carrier, and examples thereof include sodium and potassium hydroxides such as NaOH and KOH. Sodium or potassium carbonate, phosphate or aluminate may be used. Among these, NaOH and KOH are reaction boundaries (a cylindrical body having an inlet and an exhaust port at both ends is filled with the removing agent of the present invention, and hydrogen sulfide-containing air is passed through the cylindrical body from the inlet to the exhaust port. In this case, a colored removal agent (hereinafter also referred to as a reaction layer) generated by a reaction with hydrogen sulfide and an unreacted removal agent (hereinafter also referred to as an unreacted layer) are very clear, which is preferable.

  Next, the manufacturing method of the removal agent of this invention is demonstrated.

  What is important in the production method of the present invention is to contact the carrier with an alkali, and then contact the iron salt (III) solution. Conventionally, general-purpose catalysts (metal oxide-added catalysts) have been produced through the following steps (1) to (4), and a metal salt solution is brought into contact with a carrier and then an alkali solution is brought into contact therewith.

    (1) Addition of metal salt: A metal salt solution is added to a carrier and mixed, immersed, and allowed to stand.

    (2) Addition of alkali: Further, the alkali solution is added with a slight excess while stirring, and then allowed to stand. Here, the metal salt becomes hydroxide and is adsorbed on the carrier, and the supernatant coexists.

    (3) Filtration / washing: After filtering the supernatant liquid, washing with water is performed to remove soluble components to obtain a metal hydroxide adsorption carrier.

    (4) Drying / firing: After drying the metal hydroxide adsorbing carrier to remove moisture, it is calcined by heating at a high temperature to change the hydroxide into an oxide and to increase the adsorption activity of the carrier.

  In the conventional method for producing a general-purpose catalyst, the metal oxide is generally insoluble and cannot be impregnated or adsorbed directly on the support. In addition, since this manufacturing method has four steps, it takes a long time for manufacturing, and a large amount of energy is required.

  As another manufacturing method, the manufacturing method of the removal agent by patent document 4 uses activated carbon for a support | carrier, performs the process (1) -process (3) of the manufacturing method of the said reaction catalyst, and is 80 degreeC length in process (4). Time drying is given. This is for fixing in the state of hydroxide, but the basis of this production is the catalyst production method, which is different from the production method of the present invention relating to the removing agent for removing and fixing hydrogen sulfide gas.

  The reason why the production method of the present invention is in contact with the iron salt (III) solution after contacting the alkali with the support is as follows.

  Since the removal performance depends on alkali, it is necessary to ensure that the pores of the support are alkaline. In particular, when activated alumina having a large surface area is used, in order to obtain an effective removing agent, it is required to make the pores of the support more alkaline. When adding an iron salt (III) in advance and then adding an alkali, the generated hydroxide interferes with the entry of the alkali into the support pores, so that the alkali does not reach the support pores and the removal ability decreases. To do. Further, the alkali does not reach the iron salt (III) in the pores of the carrier, and an unreacted layer is formed, which leads to unclear reaction boundaries.

  In the present invention, the filtration and washing in the above step (3) are not performed. This is because the strong alkalinity is supported and the neutralized salt does not interfere with the removal ability. Furthermore, when a carrier having a large surface area such as activated alumina is used, an iron salt (III) solution can be added without drying after adding and mixing the alkali solution. This is because the carrier has a high water carrying capacity. Thus, in this invention, processes, such as not performing filtration, washing with water, drying, etc., can be simplified and a removal agent can be manufactured cheaply.

  Hereinafter, one embodiment of the method for producing the removing agent of the present invention will be described in more detail.

  First, an alkali solution is added to the carrier and mixed to support the alkali, and then the iron salt (III) solution is added to the alkali-supported carrier and mixed to thereby add the iron salt (III) to the carrier. Also carry. Here, when each of the alkali solution and the iron salt (III) solution is added to the carrier, the carrier is added and mixed so that the carrier remains in a wet state (moist sandy state). I do not. When immersed, filtration is required and drying takes time. If the wet state is maintained, the drying process can be started immediately, and the time can be shortened. In addition, since a strong base is supported, washing with water is not performed, and thereby neutralized product salts coexist on the carrier. Unlike the general-purpose catalyst and the activated carbon remover described above, the remover according to the present invention has a medium. The presence of hydrated salts does not affect the ability to remove hydrogen sulfide.

  The carrier may be a basic carrier or an acidic carrier. In the case of an acidic carrier, one that has been previously neutralized may be used, or neutralization may not be performed. The neutralization treatment of the acidic carrier is as described above, and a description thereof is omitted.

  After adding the iron salt (III) solution, the removal agent is obtained by drying. This drying ends when the wet state changes to a rustle (dry sand). Here, it does not dry completely like the general-purpose catalyst and the activated carbon remover. The water content of the removal agent in the present embodiment is, for example, about 25% for activated alumina and about 1% for diatomaceous earth, and the reaction between the removal agent and hydrogen sulfide gas is a solid phase / liquid phase (water content + reaction). Product water) and gas phase (hydrogen sulfide gas). On the other hand, the activated carbon removing agent seems to be a two-phase reaction of solid phase / gas phase.

  The amount of iron salt (III) such as iron (III) sulfate added to the carrier is appropriately determined according to the type of carrier (adsorption capacity). For example, iron salt (III) is preferably added in the range of 0.1 to 0.2 mol (0.2 to 0.4 mol in terms of Fe) per liter of activated alumina. If the amount added is less than this range, the coloration becomes light, and it may be difficult to confirm the color change due to the reaction with hydrogen sulfide. On the contrary, if the amount added is larger than this range, an excessive alkali is required, which may lead to a decrease in the amount of treatment due to a decrease in the adsorption capacity of the carrier, which is not preferable. When diatomaceous earth is used as the carrier, the iron salt (III) is preferably added in a range of 0.01 to 0.1 mol per liter of diatomaceous earth, for example.

  The amount of alkali added affects the throughput of hydrogen sulfide and the quality of the reaction boundary. For example, when the addition amount is small, the reaction boundary becomes unclear and the processing amount tends to decrease. If the amount added is large, the adsorptive capacity deteriorates, the reaction rate becomes slow, and the processing amount tends to decrease. Therefore, in the present invention, the iron salt (III) solution is brought into contact with the support so that the amount of alkali supported on the support is 10 to 20 times that of iron (Fe) in terms of molar ratio. It is supported. More specifically, for example, the amount of alkali added varies depending on the type and surface area of the carrier. For example, when the carrier is activated alumina, the amount of alkali added should be in the range of 2.0 to 4.0 mol per liter of activated alumina. Is considered. When diatomaceous earth is used as the carrier, it is considered that the amount of alkali added is, for example, in the range of 0.1 to 2.0 mol per liter of diatomaceous earth. Of course, it is essential that the amount of alkali supported on the basic carrier is in the range of 10 to 20 times in molar ratio to iron.

  When activated alumina (white) is used as a carrier, an iron (III) sulfate solution is brought into contact with the iron salt (III) as an iron salt (III) after the addition of alkali, and the iron (III) sulfate is supported and dried to give a brown color. The brown level changes from light brown to dark brown with increasing iron (III) sulfate loading. The supported iron (III) sulfate changes from brown to black by reaction with hydrogen sulfide, but the darker the degree of blackness after the reaction with hydrogen sulfide, the higher the degree of brown.

  The present invention also provides a hydrogen sulfide gas removing device. FIG. 1 shows a schematic view of a hydrogen sulfide gas removing apparatus according to an embodiment of the present invention. The apparatus of FIG. 1 is an example of a practical removal apparatus, which corresponds to 1000 times = 1 liter of the test evaluation removal agent of FIG. 2 described later.

  This apparatus includes a cylindrical column portion 2 filled with the above-described removing agent 1, an inlet 3 for introducing air containing hydrogen sulfide gas into the column portion 2, and hydrogen sulfide gas from the column portion 2. An exhaust port 4 for exhausting the removed air, and suction means 5 for introducing the air containing hydrogen sulfide into the column portion 2 from the introduction port 3 and exhausting from the exhaust port 4 are provided. The column part 2 filled with the removal agent 1 has the introduction port 3 and the exhaust port 4 described above at both ends, and is made of, for example, a transparent or translucent cylindrical body having an inner diameter of 120 mm made of glass or plastic. The removal agent 1 filled in the inside can be visually recognized from the outside. Therefore, the discoloration of the removing agent 1 due to the reaction with the hydrogen sulfide gas can be confirmed from the outside, and the breakthrough state is also clear. The suction means 5 is composed of, for example, a centrifugal exhaust fan 51 and is connected to the downstream side of the exhaust port 4. When the centrifugal exhaust fan 51 is driven, suction of air containing hydrogen sulfide gas is started, and the air containing hydrogen sulfide gas passes through the column portion 2. The hydrogen sulfide gas in the air that flows through the column part 2 is removed by the reaction with the removing agent 1 filled in the column part 2. The remover 1 that has reacted with the hydrogen sulfide gas exhibits black to deep green black, and this color extends from the inlet 3 side toward the exhaust port 4 side as the reaction with the hydrogen sulfide gas proceeds. On the other hand, since the unreacted removal agent 1 is brown, a clear boundary is formed between the reaction layer 10 of the reacted removal agent 1 and the unreacted layer 20 of the unreacted removal agent 1. In FIG. 1, the location indicated by the arrow A is the boundary. This boundary represents the treatment status and treatment limit of hydrogen sulfide gas, and can be visually confirmed. When all the removing agent in the column part 2 turns black, the driving of the centrifugal exhaust fan 51 is stopped and replaced with a new column part 2 filled with the unreacted removing agent 1.

  This device also functions as a detection device that detects the presence or absence of hydrogen sulfide gas because the removal agent 1 changes color due to reaction with the hydrogen sulfide gas.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Examples of the present invention will be specifically described below.

Adjustment of hydrogen sulfide standard gas 1) Reagent: Calcium polysulfide (sulfur mixture 27.5% solution), sodium sulfide, 10% sulfuric acid 2) Generation method: Add appropriate amount of CaSx solution or Na ₂ S into the generation vessel, and sulfuric acid solution In addition to this, air is sent by a diaphragm pump and collected in a gas bag.

Air → Diaphragm pump → Generation container (500ml plastic container) → Tetra-back (10L aluminum foil)
3) Concentration adjustment method: After reducing the volume of the gas in the bag through the remover and exhausting the volume, add clean air to dilute it.

  4) Concentration measuring method: The concentration in the bag is measured using a detector tube.

Detector tube: Gastec hydrogen sulfide detector tube 4HH (0.1-2.0%), 4H (100-2000 ppm), 4LL (2.5-60 ppm)
Remover performance test method The remover performance test apparatus shown in FIG. 2 was used for the remover performance test. The remover performance evaluation test apparatus of FIG. 2 has the same configuration as the apparatus of FIG. 1, and the same parts as those shown in FIG.

  In the apparatus of FIG. 2, a glass thin tube 21 is used as the column section 2, and a constant volume vacuum suction pump 52 having a stroke of 100 ml or 50 ml is used as the suction means 5. The removal agent 1 produced in the examples described later is filled into the glass thin tube 21 with a length of about 100 mm, and the test air (hydrogen sulfide standard gas adjusted to a predetermined concentration) is sucked using a suction pump 52 (100 ml × n ) To confirm the coloring state (color tone, coloring length (length B of the removing agent 1 in the axial direction of the removing agent 1 in the glass capillary 21 colored by reaction with hydrogen sulfide)). . The shorter the coloring length, the higher the removal efficiency. The filling length per 1.00 ml of the removing agent is 100 mm. It can be converted into weight by using the bulk specific gravity of the remover. In order to pass the test gas, an appropriate particle size of the removing agent is required, and a particle size of about 0.4 mm (40 to 80 #) is appropriate. About 1 stroke (100 ml) / 30 sec is preferable.

  The criteria for determining the coloring state of the remover is divided into the following three stages depending on the state of the coloring region.

  1) The color (black to deep green black) with a clear tip and boundary and easy measurement of the color length is evaluated as “◯”.

  2) Although the tip and boundary of coloring (black to deep green black) are somewhat unclear, when the coloring length can be measured, it is evaluated as “Δ”.

3) Although it is colored, the coloring is shaded, and when the coloring area and coloring length cannot be clearly read, it is evaluated as “x”.
<Example 1>
Coloring State of Remover by Alkaline Variable Under the conditions shown in Table 1, an alkali was added to the support, mixed well, and dried, and then Fe (III) was added and dried to obtain a hydrogen sulfide gas remover. The used carrier, alkali, and Fe (III) are as follows.
Carrier: activated alumina (NKH-D, surface area 340 m ³ / g, particle size 42-60 # (≈0.5 mm), specific gravity 0.652 g / ml, Sumitomo Chemical), each sample No. Sampling amount of 10ml = 6.52g
Alkali: 1.0 mol / LKOH solution Fe (III): 0.50 mol / LFe (NO ₃ ) ₃ solution, 0.1 mol Fe / carrier 1 L
A removal agent performance test was performed using the obtained hydrogen sulfide gas removal agent, and the coloring state such as the coloring length of the removal agent was evaluated. The results are shown in Table 1.

<Example 2>
Coloring condition of the removal agent when Fe (III) and alkali are varied Under the conditions shown in Table 2, after adding alkali to the support, mixing well and drying, further adding Fe (III) and drying, hydrogen sulfide gas A remover was obtained. The used carrier, alkali, and Fe (III) are as follows.
Carrier: activated alumina (NKH-D, surface area 340 m ³ / g, particle size 42-60 # (≈0.5 mm), specific gravity 0.652 g / ml, Sumitomo Chemical), each sample No. Sampling amount of 10ml = 6.52g
Alkali: 4.0 mol / LKOH solution Fe (III): 0.10 and 0.20 mol / LFe ₂ (SO ₄ ) ₃ solution (0.20 and 0.40 mol / L in terms of Fe)
A removal agent performance test was performed using the obtained hydrogen sulfide gas removal agent, and the coloring state such as the coloring length of the removal agent was evaluated. The results are shown in Table 2.

<Example 3>
Coloring condition of remover by various Fe (III) and various alkalis After adding alkali to the carrier and mixing and drying under the conditions shown in Table 3-5, further adding Fe (III) and drying, hydrogen sulfide gas A remover was obtained. The used carrier, alkali, and Fe (III) are as follows.
(1) Support: activated alumina (NKH-D, surface area 340 m ³ / g, particle size 42-60 # (≈0.5 mm), specific gravity 0.652 g / ml, Sumitomo Chemical), each sample No. Sampling amount of 10ml = 6.52g
Alkali: Fe (III) shown in Table 3: 0.10 mol / LFe ₂ (SO ₄ ) ₃ · nH ₂ O (content 80%, Fe conversion 0.20 mol / L)
A removal agent performance test was performed using the obtained hydrogen sulfide gas removal agent, and the coloring state such as the coloring length of the removal agent was evaluated. The results are shown in Table 3.

(2) Carrier: activated alumina (NKH-D, surface area 340 m ³ / g, particle size 42-60 # (≈0.5 mm), specific gravity 0.652 g / ml, Sumitomo Chemical), each sample No. Sampling amount of 10ml = 6.52g
Alkali: Fe (III) shown in Table 4: 0.20 mol / LFeCl ₃
The results of the remover performance test are shown in Table 4.

(3) Carrier: activated alumina (AC12, surface area 120 m ³ / g, particle size 80-100 #, specific gravity 0.977 g / ml, Sumitomo Chemical), each sample No. Sampling amount of 9.77 g
Alkali: Fe (III) shown in Table 5: 0.20 mol / LFe (NO ₃ ) ₃
The results of the remover performance test are shown in Table 5.

<Example 4>
Coloring state of remover using diatomaceous earth as a carrier Under the conditions shown in Table 6-8, an alkali was added to the carrier, mixed well, dried, and further added with Fe (III) and dried to obtain a hydrogen sulfide gas remover. It was. The used carrier, alkali, and Fe (III) are as follows.
(1) Carrier: Diatomaceous earth (for detecting agent, surface area of 1-2 m ³ / g, particle size of 40-60 #, specific gravity of 0.427 g / ml, Nishio Kogyo), each sample No. Sampling amount of 4.27 g
Alkali: Fe (III) shown in Table 6: 0.10 mol / LFe ₂ (SO ₄ ) ₃
A removal agent performance test was performed using the obtained hydrogen sulfide gas removal agent, and the coloring state such as the coloring length of the removal agent was evaluated. The results are shown in Table 6.

(2) Carrier: Diatomaceous earth (for detecting agent, surface area of 1-2 m ³ / g, particle size of 40-60 #, specific gravity of 0.427 g / ml, Nishio Kogyo), each sample No. Sampling amount of 4.27 g
Alkali: Fe (III) shown in Table 7: FeCl ₃ 0.10 mol / LFe (FeCl ₃ is thermally decomposed and changed to iron oxide when dried)
The results of the remover performance test are shown in Table 7.

(3) Carrier: Diatomaceous earth (for detecting agent, surface area of 1-2 m ³ / g, particle size 40-60 #, specific gravity 0.427 g / ml, Nishio Kogyo), each sample No. Sampling amount of 4.27 g
Alkali: Fe (III) shown in Table 8: Fe (NO ₃ ) ₃ , 0.10 mol / LFe (Fe (NO ₃ ) ₃ is thermally decomposed and changes to iron oxide during drying)
The results of the remover performance test are shown in Table 8.

<Example 5>
Coloring state of remover using other carrier Under the conditions shown in Table 9-11, after adding alkali to the carrier, mixing well and drying, further adding Fe (III) and drying to remove hydrogen sulfide gas remover Obtained. The used carrier, alkali, and Fe (III) are as follows.
(1) Carrier: molecular sieve 13X (synthetic zeolite, particle size 60-80 #, specific gravity 0.721 g / ml)
Alkali: 4.0 mol / LKOH solution 5.0 ml / 7.21 g 13X → 2.0 mol KOH / carrier 1 L
Fe (III): 0.10 mol / LFe ₂ (SO ₄ ) ₃ solution 5.0 ml / 7.21 g 13X → 0.10 mol Fe / carrier 1 L
A removal agent performance test was performed using the obtained hydrogen sulfide gas removal agent, and the coloring state such as the coloring length of the removal agent was evaluated. The results are shown in Table 9.

(2) Carrier: molecular sieve 13X (synthetic zeolite, particle size 60-80 #, specific gravity 0.721 g / ml)
Alkali: 2.0 mol / LK ₂ CO ₃ solution 5.0 ml / 7.21 g 13X → 1.0 mol K ₂ CO ₃ / carrier 1 L
Fe (III): 0.10 mol / LFe ₂ (SO ₄ ) ₃ solution 5.0 ml / 7.21 g 13X → 0.10 mol Fe / carrier 1 L
The results of the remover performance test are shown in Table 10.

(3) Carrier: Zeolite (commercially available agricultural powder / zeolite system, particle size 70 # sieving, specific gravity 0.677 g / ml)
Alkali: 4.0 mol / LKOH solution 10 ml / 6.77 g zeolite → 4.0 mol KOH / carrier 1 L
Fe (III): 0.10 mol / LFe ₂ (SO ₄ ) ₃ solution 2.5 ml / 6.77 g zeolite → 0.05 mol Fe / carrier 1 L
The results of the remover performance test are shown in Table 11.

DESCRIPTION OF SYMBOLS 1 Remover 2 Column part 21 Glass capillary 3 Inlet 4 Exhaust 5 Intake means 51 Centrifugal fan 52 Constant volume vacuum suction pump 10 Reaction layer 20 Unreacted layer

Claims (8)

A hydrogen sulfide gas removing agent in which an iron salt (III) and an alkali are supported on a carrier in a molar ratio of iron: alkali = 1: 10 to 1:20 , wherein the alkali is sodium or potassium water. A hydrogen sulfide gas removing agent, which is at least one selected from oxides, carbonates, phosphates, and aluminates . The hydrogen sulfide gas removing agent according to claim 1, wherein the carrier is alumina, diatomaceous earth, molecular sieve, or zeolite. The hydrogen sulfide gas removal according to claim 1 or 2, wherein the iron salt (III) is at least one selected from iron (III) sulfate, iron (III) nitrate and iron (III) chloride. Agent. After bringing the alkali solution into contact with the carrier, the iron salt (III) solution is brought into contact with the carrier so that the supported amount of alkali is 10 to 20 times that of the iron to be co-supported in a molar ratio. (III) and a method for producing a hydrogen sulfide gas removing agent that supports and coexists with an alkali, wherein the alkali is at least one selected from a hydroxide of sodium or potassium, carbonate, phosphate and aluminate A method for producing a hydrogen sulfide gas removing agent, wherein: The method for producing a hydrogen sulfide gas removing agent according to claim 4, wherein the carrier is alumina, diatomaceous earth, molecular sieve, or zeolite . A method for detecting hydrogen sulfide gas using the hydrogen sulfide gas removing agent according to any one of claims 1 to 3, comprising iron salt (III) and alkali supported on the hydrogen sulfide gas removing agent, hydrogen sulfide gas, A method for detecting hydrogen sulfide gas, wherein the presence or absence of hydrogen sulfide gas is detected by discoloration of the hydrogen sulfide gas removing agent associated with the generation of sulfide by the chemical reaction of. A column part filled with the hydrogen sulfide gas removing agent according to any one of claims 1 to 3 , an inlet for introducing air containing hydrogen sulfide gas into the column part, and the hydrogen sulfide gas is removed by the column part. An apparatus for removing hydrogen sulfide gas, comprising: an exhaust port for exhausting the air; and suction means for introducing the air containing hydrogen sulfide from the introduction port into the column portion and exhausting the air from the exhaust port. The column portion filled with the hydrogen sulfide gas removing agent is a transparent or translucent cylindrical body having an inlet and an exhaust port at both ends, and the discoloration of the hydrogen sulfide gas removing agent due to the hydrogen sulfide gas is visible. The hydrogen sulfide gas removing device according to claim 7 .