Organic sulfur removal agent and method for removing organic sulfur in gas

Abstract

The invention provides an organic sulfur removal agent and a method for removing organic sulfur in gas, the organic sulfur removal agent comprises the following raw materials by mass: 20-40% of organic amine, 5-20% of an ionic liquid, and 4-30% of an additive; wherein the additive is prepared from one or a combination of more than two of 1-cyclohexyl-3-aza-pyridinol, 1, 3-bis (tert-butylamino)-2-propyl alcohol, tert-butyl alcohol, anhydrous piperazine, N-methyl piperazine and N-ethyl piperazine. According to the organic sulfur removal agent disclosed by the invention, the removal capability of the organic sulfur removal agent on hydroxyl sulfur and mercaptan is improved by respectively adding A-type additives such as 1, 3-bis (tert-butylamino)-2-propanol, 1-cyclohexyl-3-aza-pyridinol and tert-butyl alcohol and B-type additives such as anhydrous piperazine, N-methyl piperazine and N-ethyl piperazine; therefore, the desulfurization efficiency of the organic sulfur removal agent is integrally improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas desulfurizing agents, and in particular to an organic sulfur removing agent and a method for removing organic sulfur from gas. Background Art

[0002] In the field of natural gas purification, the alcohol amine method and sulfone amine method with methyldiethanolamine (MDEA) as the core solvent are mainly used, but these purification processes have certain limitations, such as the limited removal capacity of organic sulfur, and the alcohol amine compound solution with full removal capacity will remove all CO2 in the raw gas while removing organic sulfur, resulting in a decrease in the commodity rate of product gas. Therefore, under the dual requirements of the standard pressure and product gas commodity rate under the new national standard for natural gas, the development of a new desulfurization system is of great significance in terms of gas purification and economic benefits.

[0003] Ionic liquids are a type of ionic compounds composed of organic cations and inorganic anions. Their physical and chemical properties are quite different from those of traditional solvents. They have the characteristics of extremely low vapor pressure, good thermal stability, and strong solubility. Therefore, based on their extremely low vapor pressure, ionic liquids will not pollute the gas to be purified and the environment during the removal of acidic gases, and will not cause solvent loss due to solvent volatilization during use.

[0004] At present, technicians have conducted relevant research and exploration on the absorption of acidic gases by ionic liquids. Representative work is as follows: Sharma et al. (Chemical Engineering Journal, 2012, 193-194: 267-275) tested the absorption capacity of different ionic liquids containing amino-functionalized imidazole groups as cations [2-aemim] for CO2, and found that the absorption capacity of these functionalized ionic liquids for CO2 at normal pressure was greatly enhanced, up to 0.49 mol CO2 / mol IL, and the capture capacity of anions for CO2 was [BF4]<[DCA]<[PF6]<[TfO]<[Tf2N]. Kuan Huang et al. (AIChE Journal, 2014, 60(12): 4232-4240) synthesized four protic ionic liquids (methyldiethanolammonium acetate [MDEAH][Ac], methyldiethanolammonium formate [MDEAH][For], dimethylethanolammonium acetate [DMEAH][Ac], and dimethylammonium glycolate [DMEAH][For]) and measured the solubility of H2S and CO2 in the four ionic liquids. At 303.2K, the Henry constants of H2S in the four ionic liquids ranged from 3.5 to 11.5×105Pa, with the lowest in [DMEAH][Ac] and the highest in [MDEAH][For]. The four ionic liquids studied have great advantages in absorption capacity and selectivity, especially the ionic liquid based on [DMEAH].

[0005] Jalili et al. (Fluid Phase Equilibria, 2017, 453: 1-12) studied the solubility of H2S in different types of imidazole ionic liquids and found that the solubility of H2S in 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([C4mim][OTf]) was higher than that in 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid ([C2mim][OTf]) with a homologous cation of C2. In addition, [C4mim][OTf] showed better selectivity for H2S. Under the same conditions, the amount of H2S dissolved in [C4mim][OTf] was 4 times that of CO2. Therefore, [C4mim][OTf] is an ideal solvent for separating acid gases such as H2S and CO2 contained in natural gas.

[0006] Wang Jianhong et al. (Natural Gas Industry-C1 Chemistry and Chemical Engineering, 2018, 38(7):100-107) combined alkaline 1-butyl-3-methylimidazolium hydroxide ([Bmim]OH) ionic liquid with acidic trioctylmethylammonium tetrachloroferrate ([A 336][FeCl4]) ionic liquids were mixed in different proportions to oxidize and absorb H2S. The results show that if [A 336 ][FeCl4] ionic liquid can reduce the cost of the catalytic oxidation system. In addition, the acidity of the mixed ionic liquid is weaker than [A 336 ][FeCl4] is beneficial to the absorption of H2S, and its viscosity decreases sharply with rising temperature, which is beneficial to medium and high temperature desulfurization.

[0007] Akhmetshina et al. (The Journal of Chemical Thermodynamics, 2019, 130: 173-182) studied the absorption performance of 1-methylimidazolium bis(2-ethylhexyl) sulfosuccinate ([mim][doc]) and 1-butyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate ([Bmim][doc]) for H2S and CO2. The solubility values ​​of the synthesized ionic liquids for H2S and CO2 exceeded those of conventional ionic liquids. For example, the solubility of H2S in [Bmim][doc] and [mim][doc] is about 6 times and 2.2-2.5 times that of conventional ionic liquids, respectively. In addition, the solubility value of acidic gases in [mim][doc] is much smaller than that in [bmim][doc], indicating that the easier it is for cations to dissociate protons, the lower the gas solubility will be.

[0008] It can be seen from the above literature reports that the ionic liquids currently used for acid gas removal mainly include alcohol amine acid salt type proton ionic liquids, methyl imidazolium hexafluorophosphate ionic liquids, methyl imidazolium trifluoromethylsulfonate ionic liquids, methyl imidazolium disulfosuccinate ionic liquids, etc. It can be seen that although ionic liquids have the advantages of low vapor pressure, good thermal stability, and strong solubility, they also have the problems of high cost, high viscosity and low efficiency. Therefore, based on the advantages of ionic liquids, it is of great significance to develop cheap and efficient ionic liquids for acid gas removal in the field of natural gas purification.

[0009] The currently widely used organic sulfur removal solvents are difficult to achieve deep removal of organic sulfur in natural gas purification plants, and their organic sulfur removal performance is even worse when the sulfide concentration is low and the gas-liquid ratio is high. They are difficult to adapt to fluctuations in the quality of the raw gas, resulting in risks in the product gas meeting the standards. Although some full-removal solvents can ensure that the product gas meets the standards smoothly, they will remove excessive or even complete CO2 while removing carbonyl sulfide in organic sulfur, resulting in increased energy consumption in the entire purification process, complex acid gas composition, and low product gas commercialization rate. Summary of the invention

[0010] In order to solve the above technical problems, the object of the present invention is to provide an organic sulfur removal agent and a method for removing organic sulfur from gas, so as to obtain an organic sulfur removal agent capable of highly efficient desulfurization.

[0011] To achieve the above object, the present invention provides an organic sulfur removal agent, the raw materials of which include, by mass percentage: 20-40% organic amine, 5-20% ionic liquid, and 4-30% additive;

[0012] The additive includes one or a combination of two or more of 1-cyclohexyl-3-azapiperidinol, 1,3-bis(tert-butylamino)-2-propanol, tert-butyl alcohol, anhydrous piperazine, N-methylpiperazine, and N-ethylpiperazine.

[0013] In the above organic sulfur removal agent, preferably, the additive includes one or a combination of two or more of 1-cyclohexyl-3-azapiridinol, 1,3-bis(tert-butylamino)-2-propanol, and tert-butyl alcohol. These additives are referred to as Class A additives in the present invention.

[0014] In the present invention, the Class A additive is mainly based on promoting the hydrolysis of carbonyl sulfide to improve the removal rate. The removal rates of the above-mentioned Class A additives for carbonyl sulfide are 1,3-bis(tert-butylamino)-2-propanol, 1-cyclohexyl-3-azapiridinol, and tert-butyl alcohol from low to high.

[0015] In the above organic sulfur removal agent, preferably, the additive includes one or a combination of two or more of anhydrous piperazine, N-methyl piperazine, and N-ethyl piperazine. In the present invention, these additives are recorded as Class B additives.

[0016] In the present invention, the function of the B-type additive is to remove mercaptan, mainly based on the acidity and nucleophilicity of the additive, and to form salt with mercaptan, thereby improving the removal rate of mercaptan. The removal rates of mercaptan of the above-mentioned B-type additives are N-methylpiperazine, anhydrous piperazine, and N-ethylpiperazine from low to high.

[0017] The above-mentioned Class A additives and Class B additives have specific removal capabilities for carbonyl sulfide and mercaptan, respectively. Class A additives are alcohol compounds, which can improve the solubility of carbonyl sulfide through the action of hydroxyl groups, thereby increasing its hydrolysis reaction rate, and play a synergistic role with the hydroxyl groups in alcohol amines. Class B additives are piperazine compounds, which can use the -NH- group in the molecule to improve the physical absorption capacity of mercaptan through hydrogen bonding effect, thereby improving the removal of mercaptan.

[0018] In the above-mentioned organic sulfur removing agent, preferably, the organic amine includes one or a combination of two or more of methyldiethanolamine (MDEA), monoethanolamine (MEA), diethanolamine (DEA), and diisopropanolamine (DIPA).

[0019] In the above-mentioned organic sulfur removing agent, preferably, the ionic liquid includes one or a combination of two or more of 1-ethyl-3-methylimidazolium hydroxyl, 1-butyl-3-methylimidazolium hydroxyl, 1-hexyl-3-methylimidazolium hydroxyl, and 1-octyl-3-methylimidazolium hydroxyl.

[0020] The present invention adopts 1-ethyl-3-methylimidazole hydroxyl ionic liquid and MDEA and other organic compounds as the main formula of the desulfurization solvent. Both compounds contain N atom electron-rich center and hydroxyl group, a hydrophilic functional group. The two compounds promote the solvation effect of the compound solution through the hydrogen bonding effect between molecules. The specific removal ability of the additives for organic sulfur can achieve the effect of deep removal of the corresponding organic sulfur.

[0021] The present invention also provides a method for removing organic sulfur from gas, which uses the above-mentioned organic sulfur removing agent for removal;

[0022] According to a specific embodiment of the present invention, preferably, the gas is natural gas. The organic sulfur removal agent of the present invention can remove acid gas from natural gas, and the acid gas includes hydrogen sulfide, organic sulfur and carbon dioxide.

[0023] According to a specific embodiment of the present invention, preferably, the organic sulfur comprises carbonyl sulfide and / or mercaptan.

[0024] According to a specific embodiment of the present invention, preferably, the mercaptan comprises methyl mercaptan and / or ethyl mercaptan.

[0025] According to a specific embodiment of the present invention, preferably, when the gas contains carbonyl sulfide, the additive of the organic sulfur removal agent includes at least one of 1-cyclohexyl-3-azapiridinol, 1,3-bis(tert-butylamino)-2-propanol and tert-butyl alcohol.

[0026] According to a specific embodiment of the present invention, preferably, the content of carbonyl sulfide in the gas is ≤500 mg / m 3 .

[0027] According to a specific embodiment of the present invention, preferably, when the gas contains mercaptan, the additive of the organic sulfur removal agent includes at least one of anhydrous piperazine, N-methyl piperazine and N-ethyl piperazine.

[0028] According to a specific embodiment of the present invention, preferably, the content of the mercaptan in the gas is ≤400 mg / m 3 .

[0029] According to a specific embodiment of the present invention, preferably, when the gas contains both carbonyl sulfide and mercaptan, the additive of the organic sulfur removal agent includes at least one of 1-cyclohexyl-3-azapiperidinol, 1,3-bis(tert-butylamino)-2-propanol, tert-butyl alcohol, and at least one of anhydrous piperazine, N-methylpiperazine, and N-ethylpiperazine.

[0030] According to a specific embodiment of the present invention, preferably, the content of carbonyl sulfide in the gas is ≤400 mg / m 3 The content of type A additive in the organic sulfur removal agent is 4-15%; more preferably, the content of carbonyl sulfide in the gas is ≤200 mg / m 3 The content of type A additive in the organic sulfur removal agent is 4-10%; more preferably, the content of carbonyl sulfide in the gas is ≤100 mg / m 3 The content of type A additive in the organic sulfur removal agent is 4-8%; more preferably, the content of carbonyl sulfide in the gas is ≤50mg / m 3 , the content of type A additive in the organic sulfur remover is 4%.

[0031] According to a specific embodiment of the present invention, preferably, the content of mercaptan in the gas is ≤150 mg / m 3 The content of the type B additive in the organic sulfur removal agent is 3-10%; more preferably, the content of mercaptan in the gas is ≤100 mg / m 3 The content of the type B additive in the organic sulfur removal agent is 3-8%; more preferably, the content of mercaptan in the gas is ≤80mg / m 3 The content of type B additive in the organic sulfur removal agent is 3-5%; more preferably, the content of mercaptan in the gas is ≤50mg / m 3 , the content of type B additive in the organic sulfur remover is 3%.

[0032] According to a specific embodiment of the present invention, preferably, when purifying gases of different compositions, the formula of the organic sulfur removal agent is as shown in Table 1:

[0033] Table 1 Solvent formula under different raw gas quality conditions

[0034]

[0035] According to a specific embodiment of the present invention, preferably, the gas further contains carbon dioxide; the volume content of carbon dioxide in the gas is ≤15%.

[0036] In the method for removing organic sulfur from gas of the present invention, by formulating the additives in the organic sulfur remover, the solution of ionic liquid and organic amine can have better desulfurization selectivity, and the organic sulfur components that are difficult to remove in the raw gas can be removed efficiently and targetedly. Moreover, by formulating the additives, a certain content of carbon dioxide can be selectively retained, thereby improving the commercial rate of the product gas.

[0037] The technical solution provided by the present invention has the following beneficial effects:

[0038] (1) The organic sulfur remover of the present invention improves the removal ability of the organic sulfur remover for hydroxyl sulfur and mercaptans by adding Class A additives such as 1,3-bis(tert-butylamino)-2-propanol, 1-cyclohexyl-3-azapiperidinol, tert-butyl alcohol, and Class B additives such as anhydrous piperazine, N-methylpiperazine, and N-ethylpiperazine, thereby improving the overall desulfurization efficiency of the organic sulfur remover.

[0039] (2) The organic sulfur removal agent of the present invention exhibits good selectivity in the reaction of absorbing acid gas, and can selectively remove sulfur-containing gas in the mixed gas, especially has a good effect on the absorption of organic sulfur, and can retain a certain amount of CO2, providing a potential possibility for improving the commercial rate of product gas in the natural gas purification process.

[0040] (3) The organic sulfur removal agent provided by the present invention has a good regeneration effect, and can be regenerated by heating, and the function of absorbing acid gas can be restored for recycling. After 50 cycles, it still maintains good organic sulfur absorption performance. The organic sulfur removal agent of the present invention has the advantages of low cost, convenient use method, and process suitable for large-scale production. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0042] In a specific embodiment of the present invention, the calculation formula for the selectivity of H2S removal is as follows:

[0043]

[0044] in, ——the amount of hydrogen sulfide in the liquid phase, mol;

[0045] ——the amount of carbon dioxide in the liquid phase, mol;

[0046] ——molar fraction of hydrogen sulfide in the feed gas;

[0047] ——the mole fraction of carbon dioxide in the feed gas;

[0048] Example 1

[0049] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0050] Preparation of organic sulfur removal agent:

[0051] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1-cyclohexyl-3-azapiperidinol, 5% N-methylpiperazine, and 25% water.

[0052] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, N-methylpiperazine and water to the reactor in sequence, and stir and mix thoroughly at a speed of 800 r / min. During stirring, the inside of the reactor must be connected to the atmosphere to avoid danger caused by increased pressure due to heat release from the reaction.

[0053] Removal of organic sulfur from gas:

[0054] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 200 ppm of carbonyl sulfide, 80 ppm of methyl mercaptan, 20 ppm of ethyl mercaptan and the like.

[0055] In terms of volume percentage, the purified raw gas contains: H2S 8ppm, CO2 2.1% (in the field of natural gas purification, the content of CO2 in the purified gas is less than 3% to meet the standard), and organic sulfide 12ppm. According to calculations, the selectivity of H2S removal is 1.54, and the removal rate of organic sulfide is 96%.

[0056] Regeneration of organic sulfur removal agent:

[0057] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0058] Example 2

[0059] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0060] Preparation of organic sulfur removal agent:

[0061] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 5% 1-cyclohexyl-3-azapiperidinol, 10% N-methylpiperazine, and 25% water.

[0062] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, N-methylpiperazine and water to the reactor in sequence, and stir and mix thoroughly at a speed of 800 r / min. During stirring, the inside of the reactor must be connected to the atmosphere to avoid danger caused by increased pressure due to heat release from the reaction.

[0063] Removal of organic sulfur from gas:

[0064] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 100 ppm of carbonyl sulfide, 140 ppm of methyl mercaptan, 40 ppm of ethyl mercaptan and the like.

[0065] In terms of volume percentage, the purified raw gas contains: H2S is 10ppm, CO2 is 2.2%, and organic sulfide is 10ppm. According to calculations, the selectivity of H2S removal is 1.58, and the organic sulfide removal rate is 96.4%.

[0066] Regeneration of organic sulfur removal agent:

[0067] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 115°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0068] Example 3

[0069] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0070] Preparation of organic sulfur removal agent:

[0071] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1-cyclohexyl-3-azapiperidinol, 10% N-methylpiperazine, and 20% water.

[0072] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exothermicity.

[0073] Removal of organic sulfur from gas:

[0074] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 200 ppm of carbonyl sulfide, 200 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0075] In terms of volume percentage, the purified raw gas contains: H2S is 6ppm, CO2 is 1.8%, and organic sulfide is 7ppm. According to calculations, the selectivity of H2S removal is 1.43, and the organic sulfide removal rate is 98.4%.

[0076] Regenerated organic sulfur remover:

[0077] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 130°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0078] Example 4

[0079] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0080] Preparation of organic sulfur removal agent:

[0081] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1-cyclohexyl-3-azapiperidinol, 5% piperazine, and 25% water.

[0082] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, piperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exothermicity.

[0083] Removal of organic sulfur from gas:

[0084] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 220 ppm of carbonyl sulfide, 70 ppm of methyl mercaptan, 20 ppm of ethyl mercaptan and the like.

[0085] In terms of volume percentage, the purified raw gas contains 6ppm H2S and 1.92% CO2. According to calculations, the selectivity of H2S removal is 1.47, the organic sulfide is 11ppm, and the organic sulfide removal rate is 96.5%.

[0086] Regenerated organic sulfur remover:

[0087] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 135°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0088] Example 5

[0089] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0090] Preparation of organic sulfur removal agent:

[0091] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 5% 1-cyclohexyl-3-azapiperidinol, 10% piperazine, and 25% water.

[0092] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, piperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exothermicity.

[0093] Removal of organic sulfur from gas:

[0094] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 220 ppm of carbonyl sulfide, 70 ppm of methyl mercaptan, 20 ppm of ethyl mercaptan and the like.

[0095] In terms of volume percentage, the purified raw gas contains: H2S is 8ppm, CO2 is 2%, and organic sulfide is 12ppm. According to calculations, the selectivity of H2S removal is 1.5, and the organic sulfide removal rate is 96.5%.

[0096] Regeneration of organic sulfur removal agent:

[0097] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 135°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0098] Example 6

[0099] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0100] Preparation of organic sulfur removal agent:

[0101] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1-cyclohexyl-3-azapiperidinol, 10% piperazine, and 20% water.

[0102] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1-cyclohexyl-3-azapiperidinol, piperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exothermicity.

[0103] Removal of organic sulfur from gas:

[0104] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 200 ppm of carbonyl sulfide, 200 ppm of methyl mercaptan, 60 ppm of ethyl mercaptan and the like.

[0105] In terms of volume percentage, the purified raw gas contains: H2S is 5ppm, CO2 is 1.75%, and organic sulfide is 10ppm. According to calculations, the selectivity of H2S removal is 1.41, and the organic sulfide removal rate is 97.8%.

[0106] Regeneration of organic sulfur removal agent:

[0107] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 110°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0108] Example 7

[0109] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0110] Preparation of organic sulfur removal agent:

[0111] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1,3-bis(tert-butylamino)-2-propanol, 5% N-methylpiperazine, and 25% water.

[0112] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0113] Removal of organic sulfur from gas:

[0114] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 200 ppm of carbonyl sulfide, 100 ppm of methyl mercaptan, 40 ppm of ethyl mercaptan and the like.

[0115] In terms of volume percentage, the purified raw gas contains: H2S is 5ppm, CO2 is 1.9%, and organic sulfide is 8ppm. According to calculations, the selectivity of H2S removal is 1.46, and the organic sulfide removal rate is 97.6%.

[0116] Regenerated organic sulfur remover:

[0117] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 115°C and the regeneration pressure is 0.18MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0118] Example 8

[0119] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0120] Preparation of organic sulfur removal agent:

[0121] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 5% 1,3-bis(tert-butylamino)-2-propanol, 10% N-methylpiperazine, and 25% water.

[0122] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0123] Removal of organic sulfur from gas:

[0124] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 70 ppm of carbonyl sulfide, 180 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0125] In terms of volume percentage, the purified raw gas contains: H2S is 7ppm, CO2 is 2.25%, and organic sulfide is 14ppm. According to calculations, the selectivity of H2S removal is 1.6, and the organic sulfide removal rate is 95.3%.

[0126] Regeneration of organic sulfur removal agent:

[0127] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0128] Example 9

[0129] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0130] Preparation of organic sulfur removal agent:

[0131] Calculated by mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1,3-bis(tert-butylamino)-2-propanol, 10% N-methylpiperazine, and 20% water.

[0132] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0133] Removal of organic sulfur from gas:

[0134] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 170 ppm of carbonyl sulfide, 180 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan, etc.

[0135] In terms of volume percentage, the purified raw gas contains: 4ppm H2S, 2.05% CO2, and 3ppm organic sulfide. According to calculations, the selectivity of H2S removal is 1.52, and the organic sulfide removal rate is 99%.

[0136] Regenerated organic sulfur remover:

[0137] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 130°C and the regeneration pressure is 0.22MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0138] Example 10

[0139] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0140] Preparation of organic sulfur removal agent:

[0141] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1,3-bis(tert-butylamino)-2-propanol, 5% piperazine, and 25% water.

[0142] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, piperazine and water into the reaction kettle in sequence, and stir them thoroughly at a speed of 800 r / min. During stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0143] Removal of organic sulfur from gas:

[0144] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 200 ppm of carbonyl sulfide, 90 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0145] In terms of volume percentage, the purified raw gas contains: H2S is 10ppm, CO2 is 1.68%, and organic sulfide is 13ppm. According to calculations, the selectivity of H2S removal is 1.39, and the organic sulfide removal rate is 96.2%.

[0146] Regenerated organic sulfur remover:

[0147] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 110°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0148] Embodiment 11

[0149] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0150] Preparation of organic sulfur removal agent:

[0151] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 5% 1,3-bis(tert-butylamino)-2-propanol, 10% N-methylpiperazine, and 25% water.

[0152] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0153] Removal of organic sulfur from gas:

[0154] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 80 ppm of carbonyl sulfide, 200 ppm of methyl mercaptan, 60 ppm of ethyl mercaptan and the like.

[0155] In terms of volume percentage, the purified raw gas contains: H2S is 9ppm, CO2 is 1.88%, and organic sulfide is 14ppm. According to calculations, the selectivity of H2S removal is 1.46, and the organic sulfide removal rate is 95.9%.

[0156] Regeneration of organic sulfur removal agent:

[0157] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 125°C and the regeneration pressure is 0.21MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0158] Example 12

[0159] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0160] Preparation of organic sulfur removal agent:

[0161] In terms of mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 40% N-methyldiethanolamine, 20% 1-butyl-3-methylimidazole hydroxyl, 10% 1,3-bis(tert-butylamino)-2-propanol, 10% piperazine, and 20% water.

[0162] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, piperazine and water into the reaction kettle in sequence, and stir them thoroughly at a speed of 800 r / min. During stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0163] Removal of organic sulfur from gas:

[0164] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 6 mole% of CO2, 180 ppm of carbonyl sulfide, 180 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0165] In terms of volume percentage, the purified raw gas contains: H2S is 6ppm, CO2 is 1.98%, and organic sulfide is 8ppm. According to calculations, the selectivity of H2S removal is 1.49, and the organic sulfide removal rate is 98%.

[0166] Regeneration of organic sulfur removal agent:

[0167] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0168] Embodiment 13

[0169] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0170] Preparation of organic sulfur removal agent:

[0171] Calculated by mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 38% N-methyldiethanolamine, 22% 1-butyl-3-methylimidazole hydroxyl, 5% 1,3-bis(tert-butylamino)-2-propanol, 10% N-methylpiperazine, and 25% water.

[0172] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0173] Removal of organic sulfur from gas:

[0174] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 5 mole% of CO2, 80 ppm of carbonyl sulfide, 120 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0175] In terms of volume percentage, the purified raw gas contains: H2S is 5ppm, CO2 is 2.87%, and organic sulfide is 12ppm. According to calculations, the selectivity of H2S removal is 2.35, and the organic sulfide removal rate is 95.2%.

[0176] Regenerated organic sulfur remover:

[0177] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0178] Embodiment 14

[0179] This embodiment provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, as follows:

[0180] Preparation of organic sulfur removal agent:

[0181] Calculated by mass percentage, the raw materials of the organic sulfur removal agent of this embodiment are: 38% N-methyldiethanolamine, 22% 1-butyl-3-methylimidazole hydroxyl, 5% 1,3-bis(tert-butylamino)-2-propanol, 10% N-methylpiperazine, and 25% water.

[0182] Add 1-butyl-3-methylimidazole hydroxyl, N-methyldiethanolamine, 1,3-bis(tert-butylamino)-2-propanol, N-methylpiperazine and water into the reaction kettle in sequence, and stir thoroughly at a speed of 800 r / min to mix; during stirring, the inside of the reaction kettle needs to be connected to the atmosphere to avoid danger caused by increased pressure due to reaction exotherm.

[0183] Removal of organic sulfur from gas:

[0184] The organic sulfur removal agent is used for purifying raw gas, the composition of which includes 90 mole% of methane, 4 mole% of H2S, 4 mole% of CO2, 80 ppm of carbonyl sulfide, 120 ppm of methyl mercaptan, 50 ppm of ethyl mercaptan and the like.

[0185] In terms of volume percentage, the purified raw gas contains: H2S is 4ppm, CO2 is 2.4%, and organic sulfide is 14ppm. According to calculations, the selectivity of H2S removal is 2.5, and the organic sulfide removal rate is 94.4%.

[0186] Regeneration of organic sulfur removal agent:

[0187] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0188] Comparative Example 1

[0189] This comparative example provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, which is the same as Example 1, except that the raw material of the organic sulfur removal agent in this comparative example does not contain the Class A additive 1-cyclohexyl-3-azapiperidinol, and the resulting percentage surplus is supplemented by water.

[0190] In this comparative example, the purified raw gas contains 12 ppm H2S, 1.89% CO2, and 59 ppm organic sulfide by volume. The selectivity of H2S removal is calculated to be 1.46, and the removal rate of organic sulfide is 80.3%.

[0191] Regeneration of organic sulfur removal agent:

[0192] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 120°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0193] Comparative Example 2

[0194] This comparative example provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, which is the same as Example 2, except that the raw material of the organic sulfur removal agent in this comparative example does not contain the Class B additive N-methylpiperazine, and the resulting percentage surplus is supplemented by water.

[0195] In this comparative example, the purified raw gas contains 18 ppm H2S, 2.6% CO2, and 117 ppm organic sulfide by volume percentage. The selectivity of H2S removal is calculated to be 1.76, and the removal rate of organic sulfide is 58.2%.

[0196] Regeneration of organic sulfur removal agent:

[0197] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 110°C and the regeneration pressure is 0.15MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0198] Comparative Example 3

[0199] This comparative example provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, which is the same as Example 8, except that the raw material of the organic sulfur removal agent in this comparative example does not contain Class B additive N-methylpiperazine, and the resulting percentage surplus is supplemented by water.

[0200] In this comparative example, the purified raw gas contains 21 ppm H2S, 2.4% CO2, and 155 ppm organic sulfide by volume percentage. According to calculation, the selectivity of H2S removal is 1.67, and the removal rate of organic sulfide is 48.3%.

[0201] Regenerated organic sulfur remover:

[0202] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 135°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0203] Comparative Example 4

[0204] This comparative example provides an organic sulfur removal agent and a method for removing organic sulfur from gas using the same, which is the same as Example 12, except that the raw materials of the organic sulfur removal agent in this comparative example do not contain Class A additive 1,3-bis(tert-butylamino)-2-propanol and Class B additive piperazine, and the resulting percentage surplus is supplemented by water.

[0205] In this comparative example, the purified raw gas contains 21 ppm H2S, 3.8% CO2, and 230 ppm organic sulfide by volume percentage. The selectivity of H2S removal is calculated to be 2.72, and the removal rate of organic sulfide is 43.9%.

[0206] The absorbent rich liquid obtained after absorption is heated by the lean-rich liquid heat exchanger and then enters the regeneration tower for regeneration. The regeneration temperature is 125°C and the regeneration pressure is 0.2MPa. The regenerated acid gas absorbent enters the lean-rich liquid heat exchanger and the lean liquid booster pump, and is pumped into the lean liquid air cooler and the lean liquid aftercooler by the lean liquid booster pump. After cooling and filtering through the lean liquid filter, the recovered absorbent basically does not contain acid gas.

[0207] The desulfurization effects of the organic sulfur removal agent of the present invention and the existing commonly used desulfurization solvents were compared, and the results are shown in Table 2 below.

[0208] Table 2 Comparison of organic sulfur and CO2 removal rates in different solvent treatments

[0209]

[0210] It can be seen from Table 2 above that the upper limits of the carbonyl sulfide removal rate and mercaptan removal rate achieved by the organic sulfur removal agent of the present invention are much higher than those of the existing removal agents, and deep desulfurization can be achieved.

[0211] The formula of the organic sulfur removal agent of the present invention can be adjusted according to the gas quality conditions. Under the premise of ensuring that the product gas quality meets the requirements of the organic sulfur removal rate, the CO2 removal rate can be reduced as much as possible. In comparison, although the organic sulfur removal rate of sulfinol-D is also relatively high, the CO2 absorption rate is too high, cannot be adjusted, and has no selectivity. The CO2 removal rate of the present invention can be adjusted between 40-98%.

Claims

1. An organic sulfur removal agent, the raw materials of which include, by mass percentage: Organic amine 20-40%, ionic liquid 5-20%, additive 4-30%; The additive includes one or a combination of two or more of 1-cyclohexyl-3-azapiperidinol, 1,3-bis(tert-butylamino)-2-propanol, tert-butyl alcohol, anhydrous piperazine, N-methylpiperazine, and N-ethylpiperazine.

2. The organic sulfur removing agent according to claim 1, wherein The additive includes one or a combination of two or more of 1-cyclohexyl-3-azapiridinol, 1,3-bis(tert-butylamino)-2-propanol, and tert-butyl alcohol.

3. The organic sulfur removing agent according to claim 1, wherein The additive includes one or a combination of two or more of anhydrous piperazine, N-methyl piperazine, and N-ethyl piperazine.

4. The organic sulfur removing agent according to claim 1, wherein The organic amine includes one or a combination of two or more of methyldiethanolamine, monoethanolamine, diethanolamine and diisopropanolamine.

5. The organic sulfur removing agent according to claim 1, wherein The ionic liquid includes one or a combination of two or more of 1-ethyl-3-methylimidazolium hydroxyl, 1-butyl-3-methylimidazolium hydroxyl, 1-hexyl-3-methylimidazolium hydroxyl, and 1-octyl-3-methylimidazolium hydroxyl.

6. A method for removing organic sulfur from gas, which uses the organic sulfur removing agent according to any one of claims 1 to 5 for removal; Preferably, the gas is natural gas.

7. The method for removing organic sulfur from gas according to claim 6, wherein: The organic sulfur includes carbonyl sulfide and / or mercaptan.

8. The method for removing organic sulfur from gas according to claim 7, wherein: The mercaptan includes methyl mercaptan and / or ethyl mercaptan.

9. The method for removing organic sulfur from gas according to claim 7, wherein: When the gas contains carbonyl sulfide, the additive of the organic sulfur removal agent includes at least one of 1-cyclohexyl-3-azapiridinol, 1,3-bis(tert-butylamino)-2-propanol and tert-butyl alcohol.

10. The method for removing organic sulfur from gas according to claim 9, wherein: The content of carbonyl sulfide in the gas is ≤500mg / m 3 .

11. The method for removing organic sulfur from gas according to claim 7, wherein: When the gas contains mercaptan, the additive of the organic sulfur removal agent includes at least one of anhydrous piperazine, N-methyl piperazine and N-ethyl piperazine.

12. The method for removing organic sulfur from gas according to claim 11, wherein: The content of mercaptan in the gas is ≤400 mg / m 3 .

13. The method for removing organic sulfur from gas according to claim 6, wherein: The gas also contains carbon dioxide; the volume content of carbon dioxide in the gas is ≤15%.

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