An ionic iron salt desulfurizing agent and its preparation method

Abstract

This invention discloses an ionic iron salt desulfurizer and its preparation method, belonging to the field of desulfurization technology. It mainly consists of soluble iron salt, a catalyst, a high-temperature resistant acid pickling corrosion inhibitor, and a pH adjuster. The catalyst is a soluble palladium salt, the corrosion inhibitor is a high-temperature resistant acid pickling corrosion inhibitor, the pH adjuster is a nitrogen-containing acidic compound, and the soluble iron salt is a divalent or trivalent soluble iron salt with an iron ion concentration of 0.1–1.5 mol / L. The desulfurizer provided by this invention has the advantages of high iron ion concentration, large sulfur capacity, high desulfurization efficiency, fast absorption and regeneration reaction rates, no by-product salt formation, and no desulfurizer consumption.

Description

Technical Field

[0001] This invention belongs to the field of desulfurization technology and relates to an ionic iron salt desulfurizing agent and its preparation method. Background Technology

[0002] In the desulfurization process for odorous exhaust gases from natural gas, biogas, coal gas, and biochemical wastewater, desulfurization methods are divided into two types: dry desulfurization and wet desulfurization. The most commonly used wet desulfurization processes are amine absorption and complexed iron oxidation-reduction. Dry desulfurization is simple but requires regular replacement of the desulfurizing agent and is only economical for locations with potential sulfur levels less than 200 kgS / d. Amine absorption desulfurization uses amine to absorb hydrogen sulfide from the gas, and then regenerates the amine to achieve cyclic desulfurization. Its characteristics are relatively complex processes and it is economical for locations with potential sulfur levels greater than 5000 kgS / d. Complexed iron oxidation-reduction desulfurization uses complexed high-valence iron to react with hydrogen sulfide in an alkaline environment to generate low-valence complexed iron and sulfur. Then, the low-valence complexed iron reacts with air (oxygen) to oxidize the low-valence complexed iron back to high-valence complexed iron, achieving the recycling of the desulfurizing agent. Its characteristics are high desulfurization efficiency, relatively complex processes, and large consumption of complexes. It is economical for locations with potential sulfur levels of 200–20000 kgS / d.

[0003] In her paper "Comparison of Natural Gas Desulfurization Processes in the Daniudi Gas Field," published in the first issue of the 2019 journal *Inner Mongolia Petroleum and Chemical Industry*, Yang Min compared the desulfurization processes for natural gas from the Daniudi Gas Field with those for processing 22,500 Nm³ of gas with a potential sulfur content of 200 kgS / d. 3 The economics of desulfurization of sulfur-containing natural gas per day are as follows: the total equipment and construction costs for dry method, amine absorption method and complexed iron oxidation-reduction method are RMB 51.49 million, RMB 61.3 million and RMB 55.8 million respectively. The comprehensive cost per cubic meter of natural gas treated is RMB 53.42, RMB 7.58 and RMB 8.90 respectively. The investment is large and the cost is high. It is imperative to find a desulfurization method with low cost and good effect.

[0004] Chinese patent CN1546209A discloses a method for efficiently treating H2S-containing waste gas. The desulfurizing agent is a solution with a pH of 0.05–7.0, composed of 10-300 g / L of variable valence metal salts (alum, copper, manganese, or cobalt) and 0.5-150 g / L of iron-containing compounds. The desulfurization process can be carried out in the range of 5-90℃, with a pH of 0.05–7.0, and can be performed under normal or pressurized conditions using a bubble absorber, plate tower, or spray tower. However, this technology has the following drawbacks: 1) When the pH value is greater than 3, the iron ions in the desulfurizing agent will form a large amount of Fe(OH)3 flocculents, and when the pH value is greater than 5.5, the iron ions in the desulfurizing agent will precipitate, which will reduce the desulfurization efficiency or even cause failure; 2) Regeneration is difficult, and there are no examples of industrial application.

[0005] In conclusion, there is an urgent need to develop a new desulfurization technology that is both highly efficient and cost-effective. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art, such as low desulfurization efficiency and high production cost of desulfurizing agents, and to provide an ionic iron salt desulfurizing agent and its preparation method.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] An ionic iron salt desulfurizing agent includes a soluble iron salt, a catalyst, a corrosion inhibitor, a pH adjuster, and deionized water;

[0009] Soluble iron salts are either divalent or trivalent soluble iron salts;

[0010] In ionic iron salt desulfurizers, the total concentration of ferrous ions (Fe2+ and ferric ions) is 0.1–1.5 mol / L.

[0011] The catalyst is a soluble palladium salt;

[0012] The corrosion inhibitor is a high-temperature resistant acid pickling corrosion inhibitor;

[0013] pH adjusters are nitrogen-containing acidic compounds.

[0014] Preferably, the pH value of the ionic iron salt desulfurizer is 0.5 to 3.0.

[0015] Preferably, in the ionic iron salt desulfurizer, the catalyst concentration is 1-15 g / L and the corrosion inhibitor concentration is 5-25 g / L.

[0016] Preferably, the soluble iron salt is any one or more of ferric chloride, ferrous chloride, ferric nitrate, ferrous sulfate, and ferric sulfate.

[0017] Preferably, the pH adjuster is any one or more of nitric acid, ammonium nitrate, sulfamic acid, ammonium sulfate, ammonium bisulfate, and ammonium chloride.

[0018] Preferably, the soluble palladium salt is any one or more of palladium chloride, palladium nitrate, and palladium sulfate.

[0019] Preferably, the corrosion inhibitor is any one or more of imidazoline, organic aldehyde, urea, alkynol or organic amine.

[0020] A method for preparing the ionic iron salt desulfurizing agent includes the following steps:

[0021] Step 1) Dissolve the soluble iron salt, catalyst and corrosion inhibitor in deionized water and stir until completely dissolved to obtain a composite solution;

[0022] Step 2) Add the pH adjuster dropwise to the composite solution to adjust the pH of the composite solution to 0.5-3.0, and obtain the ionic iron salt desulfurizer.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention discloses an ionic iron salt desulfurizer, mainly composed of soluble iron salt, catalyst, high-temperature acid-resistant corrosion inhibitor, and pH adjuster. The catalyst is a soluble palladium salt, the corrosion inhibitor is a high-temperature acid-resistant corrosion inhibitor, the pH adjuster is a nitrogen-containing acidic compound, and the soluble iron salt is a divalent or trivalent soluble iron salt with an iron ion concentration of 0.1–1.5 mol / L. The desulfurizer provided by this invention has the advantages of high iron ion concentration, large sulfur capacity, high desulfurization efficiency, fast absorption and regeneration reaction speed, no by-product salt generation, and no desulfurizer consumption.

[0025] This invention discloses a method for preparing ionic iron salt desulfurizing agents. During operation, these agents consume no desulfurizing agents, significantly reducing reagent costs. They also feature increased valence iron ion concentration, high sulfur capacity, high desulfurization efficiency, fast reaction speed, no need for complexing agents, no byproduct salt formation, and stable desulfurization operation. The amount and circulation volume of desulfurizing agents are greatly reduced, decreasing the size, weight, and power consumption of desulfurization equipment, thus significantly lowering initial investment and operating costs. Furthermore, the preparation of the desulfurizing agent is simple, low-cost, and easy to scale up. This method offers advantages such as simple preparation, small desulfurizing agent usage and circulation volume, significantly reducing the volume of the desulfurization tower and the circulation volume and power consumption of the desulfurizing agent during operation, thereby lowering the overall cost of desulfurization. Attached Figure Description

[0026] Figure 1 Flowchart of the field test device for ionic iron salt desulfurizer;

[0027] The system includes: 1. Desulfurization tower, 1-1 sulfur-containing gas inlet, 1-2 purified gas outlet, 1-3 desulfurizing agent, 1-4 sulfur slurry discharge outlet, 1-5 regenerated desulfurizing agent inlet, 2. bag-type sulfur filter, 3. aerator, 4. chemical storage tank, and 5. metering pump. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings:

[0029] Example 1

[0030] Weigh out 150 kg of ferric sulfate, 12 kg of palladium nitrate, and 20 kg of PYL-102 type imidazoline acid pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add aminosulfonic acid and nitric acid as pH adjusters to prepare a desulfurizing agent with pH = 2.0 and an iron ion concentration of 0.75 mol / L. Label it as Desulfurizing Agent A.

[0031] Example 2

[0032] Weigh out 80 kg of ferrous sulfate, 8 kg of palladium nitrate, and 10 kg of organic amine pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add ammonium nitrate as a pH adjuster to prepare a desulfurizing agent with pH = 1.5 and an iron ion concentration of 0.5 mol / L. Label it as Desulfurizing Agent B.

[0033] Example 3

[0034] Weigh out 60 kg of ferric nitrate, 1 kg of palladium chloride, and 5 kg of alkynyl alcohol acid pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add aminosulfonic acid as a pH adjuster to prepare a desulfurizing agent with pH = 3.0 and an iron ion concentration of 0.25 mol / L. Label it as desulfurizing agent C.

[0035] Example 4

[0036] Weigh out 150 kg of ferrous chloride, 15 kg of palladium nitrate, and 25 kg of urea-based pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add ammonium sulfate as a pH adjuster to prepare a desulfurizing agent with pH = 0.5 and an iron ion concentration of 0.75 mol / L. Label it as Desulfurizing Agent D.

[0037] Example 5

[0038] Weigh out 150 kg of ferric chloride, 5 kg of palladium sulfate and 15 kg of organic aldehyde acid pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add ammonium chloride as a pH adjuster to prepare a desulfurizing agent with pH = 2.5 and an iron ion concentration of 0.75 mol / L. Label it as Desulfurizing Agent E.

[0039] Example 6

[0040] Weigh out 150 kg of ferric sulfate, 10 kg of palladium nitrate, and 18 kg of PYL-102 type imidazoline acid pickling corrosion inhibitor. The order of addition is not important. Add water and stir until completely dissolved to prepare a 1000 L composite solution. Then add ammonium bisulfate as a pH adjuster to prepare a desulfurizing agent with pH=1 and an iron ion concentration of 1.0 mol / L, labeled as F desulfurizing agent.

[0041] Comparative Example 1

[0042] Weigh 150 kg of ferric sulfate and 80 kg of copper sulfate, add water and stir to dissolve and prepare 1000 L of liquid. Then add sodium hydroxide to the composite solution to adjust its pH value to 4. The desulfurizing agent has a lot of flocculent precipitate and cannot be completely dissolved. It is labeled as desulfurizing agent G.

[0043] Comparative Example 2

[0044] Weigh 16.2 kg of tetrasodium iminodisuccinate, 25.1 kg of sodium citrate, and 20 kg of ferric sulfate. Add water and stir to dissolve and prepare a 1000 L composite solution. Then add 0.88 kg of copper sulfate pentahydrate, 1.1 kg of sodium antimonate, and 0.4 kg of polyethylene glycol ether to the composite solution and stir until completely dissolved. Add sodium hydroxide to adjust the pH of the solution to 8.5. Label this solution as H desulfurizer.

[0045] 1. Comparative test of sulfur capacity of desulfurizing agents

[0046] In an acrylic tube with an inner diameter of 50 mm, add 1000 ml each of desulfurizing agents A, B, F, and G (500 mm high), resulting in a hydrogen sulfide content of 5000 g / m³. 3 Nitrogen gas is supplied via a gas nozzle installed at the bottom of an acrylic tube through a sand core cloth in the aquarium. Sulfur-containing nitrogen gas is injected at a rate of 100 ml / min. After purification with a desulfurizing agent, the hydrogen sulfide content in the nitrogen gas is measured using a Shenzhen Tean MG1000 pump-type hydrogen sulfide detector until the sulfur content at the outlet reaches 20 mg / m³. 3 The experiment was terminated, and the sulfur capacity of the desulfurizing agent is shown in Table 1.

[0047] Table 1. Sulfur capacity values ​​of desulfurizing agents prepared in each example and comparative example

[0048] Desulfurizer number A B C D E F G H Desulfurizing agent sulfur capacity (g / L) 23.6 15.6 7.6 22.8 20.1 23.5 8.4 3.8

[0049] Table 1 leads to the following conclusions: ① Comparing desulfurizers A, B, and C of this invention with Comparative Example G, it can be seen that the sulfur capacity of all redox desulfurizers is only related to the iron ion concentration of soluble iron salts in the desulfurizer. However, in Comparative Example 1, desulfurizer G has a high pH, ​​resulting in a large amount of flocculent precipitation of iron ions, which affects the desulfurization capacity of iron ions. In Comparative Example 2, desulfurizer G has a low iron ion concentration, so its sulfur capacity is also low. ② Comparing desulfurizers A and D of this invention, it can be seen that the concentration of soluble palladium salt in the catalyst contributes very little to the sulfur capacity of the desulfurizer. ③ Comparing desulfurizers A and E of this invention, it can be seen that the nitrogen-containing acidic compound—sulfamic acid—and the non-nitrogen-containing acidic compound—sulfuric acid are used to adjust the pH in this invention, which has a certain impact on the sulfur capacity of the desulfurizer. The nitrogen-containing acidic compound is superior to the non-nitrogen-containing acidic substance because ferric ions cannot directly react with divalent sulfur to displace elemental sulfur. Ferric ions can only react with hydrothioate to displace elemental sulfur. After hydrolysis of nitrogen-containing acidic substances, the generated ammonia (amine) reacts with dissolved hydrogen sulfide to generate relatively stable hydrothioate. Hydrothioate can increase the concentration of hydrothioate in the low pH desulfurizer, thereby accelerating the desulfurization reaction. ④ Comparing desulfurizers A, F, and G of this invention, it can be seen that the pH of the desulfurizer in this invention has almost no effect on the sulfur capacity of the desulfurizer. However, when the pH exceeds 3, flocculent or crystalline precipitation will occur, which objectively reduces the iron ion concentration in the desulfurizer and affects the sulfur capacity.

[0050] 2. Comparison Test of Desulfurizing Agent Effects

[0051] Repeat the sulfur capacity comparison test, adjust the injection rate of sulfur-containing nitrogen gas to 2000 ml / min to make the sulfur-containing nitrogen gas excessive, and record the hydrogen sulfide content of the purified gas at the outlet at 5 min, 15 min and 30 min. Record the concentration value of hydrogen sulfide at the outlet. The lower the sulfur content at the outlet and the greater the change, the worse the persistence and desulfurization efficiency of the desulfurizing agent, and vice versa. The test results are shown in Table 2.

[0052] Table 2. Outlet hydrogen sulfide concentration of desulfurizing agents prepared in each embodiment and comparative example

[0053]

[0054] Table 2 leads to the following conclusions: The desulfurizers of this invention are superior to those in the comparative examples. The higher the concentration of soluble iron ions in the desulfurizer, the faster the reaction, while the reaction rate and persistence in the comparative examples are poor. In the desulfurizer of this invention, the higher the concentration of the soluble palladium salt catalyst, the faster the reaction rate and the better the effect, indicating that palladium ions have a strong catalytic effect on regeneration. The desulfurizer of this invention uses a nitrogen-containing acidic compound—aminosulfonic acid—to adjust the pH value, which is faster and more persistent than using a non-nitrogen-containing acidic compound—sulfuric acid, indicating that the hydrolyzed ammonium ions can also accelerate the regeneration reaction.

[0055] In this invention, the pH of the desulfurizing agent has a relatively small impact on the reaction rate and persistence of the desulfurizing agent.

[0056] 3. Desulfurizer regeneration rate

[0057] Fresh air was introduced into the desulfurizing agent in the sulfur capacity comparison test experiment for regeneration. The air flow rate was 100 ml / min until no more sulfur slurry particles were precipitated in the desulfurizing agent. The time taken for aeration and regeneration was recorded. The longer the time, the slower the regeneration speed, and vice versa. The test results are shown in Table 3.

[0058] Table 3. Regeneration time of desulfurizing agents prepared in each example and comparative example

[0059] Desulfurizer number A B C D E F G H Regeneration time (min) 26 23 19 43 52 29 27 21

[0060] Table 3 leads to the following conclusions: the higher the iron ion concentration in the desulfurizer, the greater the oxygen consumption and the longer the regeneration time; the higher the palladium ion concentration, the shorter the regeneration time; the pH adjuster of the desulfurizer is almost unrelated to the regeneration time; the sulfur capacity in the comparative example is very small, so it also has a short regeneration time, but when converted to the regeneration time per unit of potential sulfur, the regeneration time is much longer.

[0061] 4. Comparison Test of Corrosion Rate of Desulfurizing Agent

[0062] The corrosion rate of the desulfurizing agent was tested using the corrosion rate determination method, instruments, and materials specified in the "Standard and Test Method for Water Quality of Clastic Rock Injection (SY5329-94)" standard. The test comparison results are shown in Table 4.

[0063] Table 4. Corrosion rates of desulfurizing agents prepared in each example and comparative example

[0064]

[0065] Table 4 leads to the following conclusions: The desulfurizers in this invention and H desulfurizer in Comparative Example 2 both contain corrosion inhibitors, and their corrosion rates are both lower than the national standard of 0.076 mm / a. However, the corrosion rate of G desulfurizer in Comparative Example 1 exceeds the national standard allowable value by more than 4 times.

[0066] The technical principle of the ionic iron salt desulfurizer of this invention is as follows:

[0067] When hydrogen sulfide enters the liquid of the desulfurizing agent, it dissolves in the liquid phase. The pH adjuster in the liquid phase is a nitrogen-containing acidic compound. After hydrolysis, there is a certain concentration of ammonium (amine) ions or charged particles. Under the action of ammonium (amine) ions or charged particles, hydrogen sulfide in solution produces hydrosulfite that can react with high-valent iron ions, and further ionizes into divalent sulfur. Its chemical equation is shown in equation (1).

[0068]

[0069] The hydrosulfite ion reacts with the ferric ion in the desulfurizing agent to reduce the hydrosulfite ion to elemental sulfur, thereby removing hydrogen sulfide. The reaction equation is shown in equation (2).

[0070]

[0071] During the desulfurization process, the concentration of ferric ions is gradually reduced as ferric ions are consumed, while the concentration of ferrous ions is continuously increased. After the desulfurization capacity of the desulfurizing agent decreases, oxygen needs to be introduced for regeneration. After the air dissolves into the desulfurizing agent, it becomes dissolved oxygen. Under the action of palladium ions, the dissolved oxygen forms hydrogen peroxide. The hydrogen peroxide oxidizes ferrous ions into ferric ions, and the desulfurizing agent regains its activity. The reaction equations are shown in equations (3) and (4).

[0072]

[0073]

[0074] 5. On-site desulfurization comparison test

[0075] (1) Test desulfurizing agent

[0076] Due to limitations in on-site experimental conditions, only three desulfurizing agents were selected for on-site testing: Desulfurizing agent A in Example 1, Desulfurizing agent G in Comparative Example 1, and Desulfurizing agent H in Comparative Example 2. To facilitate testing of the original solutions using desulfurizing agents, the method of diluting the solutions 50 times as described in the literature was not followed. This was mainly due to the limited volume of the desulfurization tower in the on-site test.

[0077] (2) Test apparatus

[0078] A simplified flow chart of the experimental desulfurization unit is attached. Figure 1 The system includes a desulfurization tower 1, a bag-type sulfur filter 2, a chemical storage tank 4, and a metering pump 5 connected in sequence. The bottom of the desulfurization tower 1 is equipped with a sulfur-containing gas inlet 1-1, and the top of the desulfurization tower 1 is equipped with a purified gas outlet 1-2. The side wall of the desulfurization tower 1 is provided with a sulfur slurry outlet 1-4, which discharges the sulfur slurry into the bag-type sulfur filter 2. The upper part of the side wall of the desulfurization tower 1 is provided with a regeneration desulfurizing agent inlet 1-5. The desulfurization tower 1 is filled with desulfurizing agent 1-3. An aerator 3 is installed in the chemical storage tank 4. The outlet of the metering pump 5 is connected to the regeneration desulfurizing agent inlet 1-5 through a pipeline.

[0079] The specific parameters for the test desulfurization unit are as follows:

[0080] Desulfurization tower: 500mm in diameter and 1800mm in height;

[0081] Metering pump: displacement 5~50L / h, pressure 0.1~10Mpa;

[0082] Sulfur filter: 6 bags / 0.6Mpa;

[0083] Medicine storage tank: 1m 3 ;

[0084] Aerator: 1.5kw, 2kgO2 / h.

[0085] (3) Test site and conditions

[0086] Test site: TZ102-XH well in Tazhong, Tarim Oilfield

[0087] Test gas: Wellhead pressure 3.2 MPa, hydrogen sulfide content 4500 mg / m³ 3 It contains 5.7% carbon dioxide, 1.2% nitrogen, and the remainder is hydrocarbon gas.

[0088] (4) Test methods

[0089] First, add 200L of the desulfurizing agent used in the test to the desulfurization tank. Then, adjust the pressure of the natural gas separated from the wellhead from 3.2MPa to 2.8MPa through the pressure regulating valve, and control the natural gas flow rate to 50Nm³. 3 / h, sulfur-containing natural gas enters from the bottom of the desulfurization tower, undergoes absorption reaction, and is discharged from the top of the desulfurization tower. After 2 hours of operation, the desulfurizing agent slurry containing sulfur in the desulfurization tower is continuously discharged under its own pressure. The discharged desulfurizing agent sulfur slurry passes through a bag filter to remove sulfur and then enters a storage tank. The desulfurizing agent in the storage tank is aerated and regenerated by an aerator and then pumped back to the desulfurization tower by a metering pump. The metering pump's discharge rate is adjusted to 20L / h to achieve continuous and stable circulation of the desulfurizing agent. During the test operation of the desulfurizing agent of this invention and the desulfurizing agent G of Comparative Example 1, no desulfurizing agent was added. However, to ensure the purification effect of the desulfurizing agent H of Comparative Example 2, 1000g of complexing agent and other supporting agents were added daily to compensate for the consumption of complexing agent due to oxidative degradation during operation.

[0090] During the test, the hydrogen sulfide content at the desulfurization tower outlet was measured every hour, and the arithmetic mean of the hydrogen sulfide content over a day was taken as the average value of the outlet hydrogen sulfide content for that day.

[0091] (5) The experimental results are shown in Table 5.

[0092] Table 5. Hydrogen sulfide concentration at the purified outlet of the desulfurizing agents prepared in Example 1 and the comparative example.

[0093]

[0094] (6) Results Analysis

[0095] As can be seen from Table 5, the desulfurization efficiency of the desulfurizing agent of the present invention is as high as 99.70%, which is comparable to the desulfurization effect of H desulfurizing agent in Comparative Example 2. Moreover, there is no desulfurizing agent consumption, which greatly reduces the operating reagent costs and saves costs. The actual application effect of G desulfurizing agent in Comparative Example 1 is better than the experimental effect, but it is the worst among the three desulfurizing agents tested.

[0096] In summary, the desulfurizer of the present invention is an ionic iron salt desulfurizer with good desulfurization effect, stable regeneration, low investment and low operating cost, no desulfurizer consumption during operation.

[0097] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An ionic iron salt desulfurizer characterized by, The soluble iron salt, the catalyst, the corrosion inhibitor, the pH regulator and deionized water are included. The soluble iron salt is a divalent soluble iron salt or a trivalent soluble iron salt. In the ionic iron salt desulfurizer, the iron ion concentration of the soluble iron salt is 0.1-1.5 mol / L. The catalyst is a soluble palladium salt. The corrosion inhibitor is a high-temperature resistant acid pickling corrosion inhibitor. The pH regulator is a nitrogen-containing acidic compound. The pH value of the ionic iron salt desulfurizer is 0.5-3.

0. The preparation method of the ionic iron salt desulfurizer comprises the following steps: Step 1) dissolving the soluble iron salt, the catalyst and the corrosion inhibitor into deionized water, stirring until completely dissolved to obtain a composite solution; Step 2) adding the pH regulator into the composite solution dropwise, adjusting the pH of the composite solution to 0.5-3.0 to obtain the ionic iron salt desulfurizer; The pH regulator is any one or more of ammonium nitrate, sulfamic acid, ammonium sulfate, ammonium bisulfate and ammonium chloride. The soluble palladium salt is any one or more of palladium chloride, palladium nitrate and palladium sulfate.

2. The ionic iron salt desulfurizer of claim 1, wherein, In the ionic iron salt desulfurizer, the catalyst concentration is 1-15 g / L, and the corrosion inhibitor concentration is 5-25 g / L.

3. The ionic iron salt desulfurizer of claim 1, wherein, The soluble iron salt is any one of ferric chloride, ferrous chloride, ferric nitrate, ferrous sulfate and ferric sulfate.

4. The ionic iron salt desulfurizer of claim 1, wherein, The corrosion inhibitor is any one or more of imidazoline, organic aldehyde, acetylenic alcohol and organic amine. The corrosion inhibitor is any one or more of imidazoline, organic aldehyde, acetylenic alcohol and organic amine.

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