Acid liquid hydrogen sulfide absorbent and application thereof

Abstract

The invention relates to an acid liquid hydrogen sulfide absorbent. The absorbent comprises a heterocyclic amine derivative with a steric hindrance effect and a catalyst, the water-based paint further comprises a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component and an eighth component, wherein the first component accounts for 1-5% by mass; the proportion of the second component is 4%-6%; the proportion of the third component is 2%-5%; the proportion of the fourth component is 3%-5%; the proportion of the fifth component is 5%-7%; the proportion of the sixth component is 5%-6%; the proportion of the seventh component is 2%-7%; the proportion of the eighth component is 5%; the proportion of the heterocyclic amine derivative with the steric hindrance effect is 10%-25%; 1% to 2% of a catalyst; and the balance of water. A heterocyclic amine derivative with a steric hindrance effect is adopted, and a catalyst is added to accelerate the absorption efficiency of hydrogen sulfide.

Description

Technical Field

[0001] The invention belongs to the technical field of downhole operation of oil and gas wells, and in particular relates to an acid liquid hydrogen sulfide absorbent and application thereof. Background Art

[0002] Oilfield water injection wells and water source wells contain a certain amount of sulfate-reducing bacteria (SRB). Under the action of SRB bacteria, ferrous sulfide scale deposits are easily generated in surface process pipelines and underground, affecting the normal production of processes and water wells. Acidification is a common descaling measure. During acidification, one or more acidic solutions or acidic mixtures are injected into the formation to make the chemical reaction FeS+2H + →Fe 2+ +H2S↑The reaction rate increases, and the amount of hydrogen sulfide generated increases. Among them, sulfur elements mainly come from ferrous sulfide scale sediments, and ferrous sulfide scale mainly comes from SRB bacterial corrosion. In addition, the formation contains a large amount of pyrite, which will produce a large amount of hydrogen sulfide gas when it encounters acid. The ground hydrogen sulfide absorbent solution (alkali solution, triazine absorbent or complex iron absorbent) will produce precipitation or incomplete absorption, affecting the acidification operation.

[0003] Therefore, in response to these problems, the present application can provide an absorbent that can effectively absorb hydrogen sulfide in acidification operations, thereby ensuring that the hydrogen sulfide content is greatly reduced during flowback. Summary of the invention

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] An acid liquid hydrogen sulfide absorbent, the absorbent comprising a heterocyclic amine derivative having a steric hindrance effect and a catalyst;

[0006] Among them, the heterocyclic amine derivative with steric hindrance effect is one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylamino diethyl ether;

[0007] The absorbent also includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, and an eighth component, and the mass percentage of each component is: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

[0008] Furthermore, the first component is a nitrogen-containing heterocyclic compound, and the preparation method of the first component is:

[0009] Put cyanuric chloride, m-dichlorobenzene and acetone into a reaction kettle, gradually add ammonium chloride, propionic acid, glycerol, polyol and polyamine mixed solvent, select the ratio of main reactants, under alkaline conditions, the reaction temperature is 50-70°C, the reaction time is 2-4h, and the first component is obtained.

[0010] Furthermore, the second component is caprolactam-bromobutyltriethylenediamine ionic liquid; and the preparation method of the second component is:

[0011] Put n-butyl bromide, ethyl acetate and triethylenediamine in a molar ratio of 1:1:1 to 1:3:3 in a round-bottom flask, heat with a water bath, the reaction temperature is 80-100°C, reflux for 24 hours to obtain a white powder, then use a rotary evaporator to remove most of the solvent under reduced pressure, and then place it in an electric heating blast drying oven, dry it at 80°C for 48 hours to remove water and the remaining organic solvent, and then obtain n-butyl triethylenediamine bromide;

[0012] Among them, n-butyl bromide reacts with triethylenediamine to generate n-butyl triethylenediamine bromide salt, and the reaction equation is as follows:

[0013]

[0014] The obtained triethylenediamine salt and caprolactam are mixed in a molar ratio of 1:2 to 1:4, added into a round-bottom flask with a stirring rotor, and the round-bottom flask is placed in a heat-collecting constant-temperature heating magnetic stirrer for full stirring, the reaction temperature is 70-80°C, the reaction time is 90 minutes, and the stirring speed is 20 rpm; the stirring reactor is started to start the reaction; after the reaction is completed, caprolactam-bromo-n-butyltriethylenediamine ionic liquid is obtained.

[0015] Furthermore, the third component is butyl triethyl quaternary ammonium glycine ionic liquid, and the preparation method of the third component is:

[0016] (1) Obtaining butyl triethyl quaternary ammonium base:

[0017] Triethylamine was charged into a 1L reactor, 250mL of anhydrous ethanol was added, and n-butyl bromide was added under stirring, and the reaction was refluxed at 100°C for 12h, wherein the molar ratio of triethylamine to n-butyl bromide was 1:1-1:2; after the reaction was completed, the solvent was evaporated to precipitate white crystals, which were filtered and dried to obtain butyl triethyl ammonium bromide crystals with a yield of about 90%; butyl triethyl ammonium bromide and potassium hydroxide with a molar ratio of 1:1 were respectively dissolved in a certain volume of anhydrous ethanol, and the potassium hydroxide solution was slowly added to the butyl triethyl ammonium bromide solution under sufficient stirring, and the reaction was carried out at room temperature for 8h, and the potassium bromide precipitate was filtered to remove the potassium bromide precipitate, and a butyl triethyl ammonium quaternary ammonium base solution with a mass content of about 30% was obtained, and the yield (based on the content of butyl triethyl ammonium quaternary ammonium base) was about 90%; the synthesis equation of butyl triethyl ammonium bromide was:

[0018]

[0019] Wherein, R1 is butyl, and R2, R3 and R4 are all ethyl;

[0020] (2) Preparation of butyltriethyl quaternary ammonium glycine ionic liquid

[0021] Glycine was placed in a reaction kettle, 150 mL of distilled water was added, and butyl triethyl ammonium alkali solution was slowly added to the reaction kettle while stirring at room temperature, and the reaction was carried out for 3 hours. The solvent and water were removed by evaporation and concentration, and the insoluble matter was removed by filtration to obtain a crude product of butyl triethyl glycine ionic liquid; a mixed solvent of acetonitrile and chloroform in a molar ratio of 1:1 was added to the crude product to dissolve, the insoluble matter was removed by filtration, the solvent was recovered by evaporation, and butyl triethyl quaternary ammonium glycine ionic liquid was obtained. The final yield of the product (based on the molar number of the raw material tetraalkyl quaternary ammonium halide) was 85%; the synthesis equation of butyl triethyl quaternary ammonium glycine ionic liquid is:

[0022]

[0023] Among them, R1 is butyl, R2, R3 and R4 are all ethyl, and HY is glycine.

[0024] Furthermore, the fourth component is caprolactam-tetrabutylammonium halide ionic liquid and urea-choline chloride ionic liquid, and the preparation method of the fourth component is:

[0025] Caprolactam-tetrabutylammonium halide ionic liquid can be prepared by a one-step reaction of CPL (caprolactam) and TBAX (tetrabutylammonium halide); urea-choline chloride ionic liquid can be prepared by a one-step reaction of urea and choline chloride; the halogens are fluorine (F), chlorine (Cl), and bromine (Br);

[0026] (1) CPL and TBAB were mixed in a molar ratio of 1:1.2-1:1.5, and placed in a round-bottom flask. The round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer, and heated and stirred at a reaction temperature of 70-80° C. and a stirring speed of 80 rpm until a light yellow transparent viscous liquid was obtained. The reaction time was 90 min. After the reaction was completed, the mixture was placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0027] (2) Weigh urea and choline chloride in a 1:1 molar ratio, add them into a round-bottom flask, place them in a heat-collecting constant temperature heating magnetic stirrer and stir them thoroughly. The reaction temperature is 70° C. and the reaction time is 90 min. After the reaction is completed, urea choline chloride ionic liquid is obtained, which is placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0028] Furthermore, the fifth component is a mixture of one or more of 1,3,5-tris-(2-hydroxyethyl)-hexahydro-s-triazine, N-methyl-3,5-di-(2-hydroxyethyl)-hexahydro-s-triazine, N,N,N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine, and N,N,N-1.3.5 trimethyl-hexahydro-s-triazine.

[0029] Furthermore, the sixth component is ethylenediaminetetraacetic acid sodium iron salt EDTANa-Fe, and the preparation method of EDTANa-Fe is:

[0030] Dissolve 8.2 g of EDTANa2 in 100 mL of deionized water at 60℃~70℃. After complete dissolution, pour into a 250 mL round-bottom flask. Add 10 g of freshly prepared Fe(OH)3 under constant stirring. Adjust the pH to 8. React in a boiling water bath at a constant temperature for 2 h. Filter while hot and concentrate the filtrate under reduced pressure to a viscous state. After cooling, wash with anhydrous ethanol three times.

[0031] Furthermore, the seventh component is a compound of oxazolidine and glyoxal in a mass ratio of 1.5:1.0.

[0032] Furthermore, the eighth component is one or a mixture of several of N-methyldiethanolamine, diisopropanolamine, diethanolamine, ethanolamine and ethylene glycol.

[0033] Furthermore, the catalyst is one or a mixture of amine-borate, glycine or sodium tartrate.

[0034] Furthermore, the absorbent also includes an activator, a stabilizer, a scale inhibitor and dispersant, and an organic solvent; the activator is one or a mixture of phosphoric acid, dipotassium hydrogen phosphate, and sodium acid pyrophosphate.

[0035] Furthermore, the stabilizer is one or a mixture of phosphite, polyol, rosin acid and tall oil.

[0036] Furthermore, the organic solvent is one or a mixture of ethers such as methanol, isopropyl ether, petroleum ether, and alkanes.

[0037] Furthermore, the scale dispersant is a copolymer of carboxyl, hydroxyl, sulfuric acid, phosphonic acid and other groups. Since it contains phosphonic acid groups on its straight chain and some branches, the copolymer has excellent anti-scaling performance; commonly used ones are acrylic acid-acrylate-phosphoric acid-sulfonate copolymer or carboxylate-sulfonate-nonionic terpolymer.

[0038] The acid liquid hydrogen sulfide absorbent is used to absorb hydrogen sulfide in surface process pipelines and underground acidification operations at a mass percentage of 0.5-6%.

[0039] The advantages and positive effects of the present invention are:

[0040] Heterocyclic amine derivatives with steric hindrance effect are introduced, catalysts are added to accelerate the absorption efficiency of hydrogen sulfide, the contact area between crude oil and absorbent is increased, and scale inhibitors and dispersants are added to prevent the formation of sulfides or other scales. DETAILED DESCRIPTION

[0041] First, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned herein.

[0042] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0043] Example 1

[0044] The acid liquid hydrogen sulfide absorbent provided in this embodiment comprises a heterocyclic amine derivative having a steric hindrance effect and a catalyst;

[0045] Among them, the heterocyclic amine derivative with steric hindrance effect is one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylamino diethyl ether;

[0046] The absorbent also includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, and an eighth component, and the mass percentages of the components are: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

[0047] Specific:

[0048] The absorbent further comprises a first component, the first component is a nitrogen-containing heterocyclic compound, and the preparation method of the first component is:

[0049] Put cyanuric chloride, m-dichlorobenzene and acetone into a reaction kettle, gradually add ammonium chloride, propionic acid, glycerol, polyol and polyamine mixed solvent, select the ratio of main reactants, under alkaline conditions, the reaction temperature is 50-70°C, the reaction time is 2-4h, and the first component is obtained.

[0050] The absorbent further comprises a second component, wherein the second component is a caprolactam-bromobutyltriethylenediamine ionic liquid; and the preparation method of the second component is:

[0051] Put n-butyl bromide, ethyl acetate and triethylenediamine in a molar ratio of 1:1:1 to 1:3:3 in a round-bottom flask, heat with a water bath, the reaction temperature is 80-100°C, after reflux reaction for 24 hours, the liquid in the round-bottom flask turns milky white, filter to obtain white powder, then use a rotary evaporator to distill under reduced pressure to remove most of the solvent, then place in an electric heating blast drying oven, dry at 80°C for 48 hours to remove water and remaining organic solvent, and obtain n-butyl triethylenediamine bromide;

[0052] Among them, n-butyl bromide reacts with triethylenediamine to generate n-butyl triethylenediamine bromide salt, and the reaction equation is as follows:

[0053]

[0054] The obtained triethylenediamine salt and caprolactam are mixed in a molar ratio of 1:2 to 1:4, added into a round-bottom flask with a stirring rotor, and the round-bottom flask is placed in a heat-collecting constant-temperature heating magnetic stirrer for full stirring, the reaction temperature is 70-80°C, the reaction time is 90 minutes, and the stirring speed is 20 rpm; the stirring reactor is started to start the reaction; after the reaction is completed, caprolactam-bromo-n-butyltriethylenediamine ionic liquid is obtained.

[0055] The absorbent further comprises a third component, wherein the third component is butyl triethyl quaternary ammonium glycine ionic liquid, and the preparation method of the third component is:

[0056] (1) Obtaining butyl triethyl quaternary ammonium base:

[0057] Triethylamine was charged into a 1L reactor, 250mL of anhydrous ethanol was added, and n-butyl bromide was added under stirring, and the reaction was refluxed at 100°C for 12h, wherein the molar ratio of triethylamine to n-butyl bromide was 1:1-1:2; after the reaction was completed, the solvent was evaporated to precipitate white crystals, which were filtered and dried to obtain butyl triethyl ammonium bromide crystals with a yield of about 90%; butyl triethyl ammonium bromide and potassium hydroxide with a molar ratio of 1:1 were respectively dissolved in a certain volume of anhydrous ethanol, and the potassium hydroxide solution was slowly added to the butyl triethyl ammonium bromide solution under sufficient stirring, and the reaction was carried out at room temperature for 8h, and the potassium bromide precipitate was filtered to remove the potassium bromide precipitate, and a butyl triethyl ammonium quaternary ammonium base solution with a mass content of about 30% was obtained, and the yield (based on the content of butyl triethyl ammonium quaternary ammonium base) was about 90%; the synthesis equation of butyl triethyl ammonium bromide was:

[0058]

[0059] Wherein, R1 is butyl, and R2, R3 and R4 are all ethyl;

[0060] (2) Preparation of butyltriethyl quaternary ammonium glycine ionic liquid

[0061] Glycine was placed in a reaction kettle, and 150 mL of distilled water was added. At room temperature, butyl triethyl ammonium alkali solution was slowly added to the reaction kettle while stirring. The reaction was continued for 3 hours. The solvent and water were removed by evaporation and concentration. Insoluble matter was removed by filtration to obtain a crude product of butyl triethyl glycine ionic liquid. A mixed solvent of acetonitrile and chloroform in a molar ratio of 1:1 was added to the crude product to dissolve it. Insoluble matter was removed by filtration. The solvent was recovered by evaporation and vacuum drying was performed to obtain a refined butyl triethyl ammonium glycine ionic liquid. The final yield of the product (based on the molar number of the raw material tetraalkyl quaternary ammonium halide) was 85%. The synthesis equation of butyl triethyl ammonium glycine ionic liquid is:

[0062]

[0063] Among them, R1 is butyl, R2, R3 and R4 are all ethyl, and HY is glycine.

[0064] The absorbent further comprises a fourth component, which is caprolactam-tetrabutylammonium halide ionic liquid and urea-choline chloride ionic liquid. The preparation method of the fourth component is:

[0065] Caprolactam-tetrabutylammonium halide ionic liquid can be prepared by a one-step reaction of CPL and TBAX; urea-choline chloride ionic liquid can be prepared by a one-step reaction of urea and choline chloride; the halogens are fluorine (F), chlorine (Cl), and bromine (Br);

[0066] (1) CPL and TBAB were mixed in a molar ratio of 1:1.2-1:1.5, and placed in a round-bottom flask. The round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer, and heated and stirred at a reaction temperature of 70-80° C. and a stirring speed of 80 rpm until a light yellow transparent viscous liquid was obtained. The reaction time was 90 min. After the reaction was completed, the mixture was placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0067] (2) Weigh urea and choline chloride in a 1:1 molar ratio, add them into a round-bottom flask, place them in a heat-collecting constant temperature heating magnetic stirrer and stir them thoroughly. The reaction temperature is 70° C. and the reaction time is 90 min. After the reaction is completed, urea choline chloride ionic liquid is obtained, which is placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0068] The absorbent also includes a fifth component, which is one or a mixture of 1,3,5-tris-(2-hydroxyethyl)-hexahydro-s-triazine, N-methyl-3,5-di-(2-hydroxyethyl)-hexahydro-s-triazine, N,N,N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine, and N,N,N-1.3.5 trimethyl hexahydro-s-triazine.

[0069] The absorbent further comprises a sixth component, wherein the sixth component is ethylenediaminetetraacetic acid sodium iron salt EDTANa-Fe, and the preparation method of the EDTANa-Fe is as follows:

[0070] Dissolve 8.2 g of EDTANa2 in 100 mL of deionized water at 60℃~70℃. After complete dissolution, pour into a 250 mL round-bottom flask. Add 10 g of freshly prepared Fe(OH)3 under constant stirring. Adjust the pH to 8. React in a boiling water bath at a constant temperature for 2 h. Filter while hot and concentrate the filtrate under reduced pressure to a viscous state. After cooling, wash with anhydrous ethanol three times.

[0071] The absorbent further comprises a seventh component, which is a compound of oxazolidine and glyoxal in a mass ratio of 1.5:1.0.

[0072] The absorbent also includes an eighth component, which is one or a mixture of several of N-methyldiethanolamine, diisopropanolamine, diethanolamine, ethanolamine, and ethylene glycol.

[0073] The catalyst is one or a mixture of amine-borate, glycine or sodium tartrate.

[0074] The amine-borate is a salt produced by the reaction of an amine and boric acid, such as NN-dimethylaniline tetrakis(pentafluorobenzene)borate or N-sulfonamide borate.

[0075] The absorbent also includes an activator, a stabilizer, a scale inhibitor and dispersant, and an organic solvent; the activator is a mixture of one or more of phosphoric acid, dipotassium hydrogen phosphate, and sodium acid pyrophosphate; the stabilizer is a mixture of one or more of phosphite, polyol, rosin acid, and tall oil; the solvent is a mixture of one or more of ethers and alkanes such as methanol, isopropyl ether, and petroleum ether; the scale dispersant is a copolymer of carboxyl, hydroxyl, sulfuric acid, phosphonic acid, and other groups. Since its linear chain and some branches contain phosphonic acid groups, the copolymer has excellent anti-scaling performance. Commonly used copolymers include acrylic acid-acrylate-phosphoric acid-sulfonate copolymers or carboxylate-sulfonate-nonionic terpolymers.

[0076] The acid liquid hydrogen sulfide absorbent is used to absorb hydrogen sulfide in surface process pipelines and underground acidification operations at a mass percentage of 0.5-6%.

[0077] It should be noted that in order to achieve better desulfurization effect, it can be considered that: when the hydrogen sulfide content in the liquid is less than 1000ppm, the desulfurizer is added at 1%; when the hydrogen sulfide content is 2000ppm, the desulfurizer is added at 2%; when the hydrogen sulfide content is 3000ppm, the desulfurizer is added at 3%; when the hydrogen sulfide content is above 4000ppm, the desulfurizer is added at 4%; if the content is above 5000ppm, the desulfurizer is added at more than 6%.

[0078] Example 2

[0079] The absorbent of this embodiment includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, an eighth component, a heterocyclic amine derivative with a steric hindrance effect and a catalyst; and the mass percentages of the components are: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with a steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

[0080] Preparation of the first component: Put 0.1 mol of cyanuric chloride, 0.3 mol of m-dichlorobenzene and 0.2 mol of acetone as main reactants into a reaction kettle, and gradually add 0.05 mol of ammonium chloride, 0.1 mol of propionic acid, 0.1 mol of glycerol, 0.2 mol of polyol and 0.1 mol of polyamine, under alkaline conditions of pH 8, reaction temperature 60°C and reaction time 4 hours.

[0081] Preparation of the second component: caprolactam-bromobutyltriethylenediamine ionic liquid

[0082] (1) 0.1 mol of n-butyl bromide, 0.2 mol of ethyl acetate and 0.1 mol of triethylenediamine are placed in a round-bottom flask, heated in a water bath, the reaction temperature is 90° C., after reflux reaction for 24 hours, the liquid in the round-bottom flask turns milky white, filtered to obtain a white powder, and then most of the solvent is removed by vacuum distillation using a rotary evaporator, and then placed in an electric heating blast drying oven, dried at 80° C. for 48 hours to remove water and the remaining organic solvent, to obtain n-butyl triethylenediamine bromide;

[0083] (2) The obtained triethylenediamine salt is mixed with 0.2 mol of caprolactam in different proportions, and added into a round-bottom flask with a stirring rotor. The round-bottom flask is placed in a heat-collecting constant temperature heating magnetic stirrer and stirred thoroughly. The reaction temperature is 70° C., the reaction time is 90 min, and the stirring speed is 80 rpm. The stirred reactor is started to start the reaction. After the reaction is completed, caprolactam-bromobutyltriethylenediamine ionic liquid is obtained.

[0084] Preparation of the third component: 1.0 mol of triethylamine is loaded into a 1L reactor, 250 mL of anhydrous ethanol is added, 1.0 mol of n-butyl bromide is added under stirring, and the reaction is refluxed at 100°C for 12 hours; after the reaction is completed, the solvent is evaporated to precipitate white crystals, which are filtered and dried to obtain butyl triethyl ammonium bromide crystals with a yield of about 85%; 0.9 mol of butyl triethyl ammonium bromide and 0.9 mol of potassium hydroxide are respectively dissolved in a certain volume of anhydrous ethanol, and the potassium hydroxide solution is slowly added to the butyl triethyl ammonium bromide solution until the pH is 8 under sufficient stirring, and the reaction is carried out at room temperature for 8 hours, and the potassium bromide precipitate is filtered to obtain the desired solution;

[0085] 1.1 mol of glycine was placed in a reactor, and 150 mL of distilled water was added. At room temperature, butyl triethyl ammonium base solution was slowly added to the reactor while stirring. The reaction was carried out for 3 hours. The solvent and water were removed by evaporation and concentration. The insoluble matter was removed by filtration to obtain a crude product of butyl triethyl glycine ionic liquid. 100 mL of a 1:1 mixed solvent of acetonitrile and chloroform was added to the crude product to dissolve it, the insoluble matter was removed by filtration, the solvent was recovered by evaporation, and the desired ionic liquid was obtained by vacuum drying.

[0086] Preparation of the fourth component: (1) CPL and TBAB were mixed in a molar ratio of 1:1.2, and placed in a round-bottom flask. The round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer, and heated and stirred at a reaction temperature of 80° C. and a stirring speed of 80 rpm until a light yellow transparent viscous liquid was obtained. The reaction time was 90 min. After the reaction was completed, the mixture was placed in a vacuum drying oven to dry, cooled, placed in a desiccator, and stored at room temperature.

[0087] (2) Weigh urea and choline chloride in a molar ratio of 1:1, add them into a round-bottom flask, place them in a heat-collecting constant temperature heating magnetic stirrer and stir them thoroughly, the reaction temperature is 80° C., and the reaction time is 90 min; after the reaction, urea choline chloride ionic liquid is obtained, placed in a vacuum drying oven to dry, placed in a desiccator after cooling, and stored at room temperature.

[0088] Preparation of the fifth component: a mixture of one or more of 1,3,5-tris-(2-hydroxyethyl)-hexahydro-s-triazine, N-methyl-3,5-di-(2-hydroxyethyl)-hexahydro-s-triazine, N,N,N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine, and N,N,N-1.3.5 trimethyl hexahydro-s-triazine.

[0089] Preparation of the sixth component: The sixth component is ethylenediaminetetraacetic acid sodium iron salt EDTANa-Fe. The preparation method of EDTANa-Fe is as follows: dissolve 8.2g of EDTANa2 in 100mL of 70°C deionized water, pour into a 250mL round-bottom flask after complete dissolution, add 10g of freshly prepared Fe(OH)3 under constant stirring, adjust the pH to 8, react at a constant temperature in a boiling water bath for 2h, filter while hot, reduce the pressure and concentrate the filtrate to a viscous state, cool and wash with anhydrous ethanol 3 times.

[0090] Preparation of the seventh component:

[0091] The absorbent was compounded according to m(oxazolidine, g):m(glyoxal, g)=1.5:1.0 before use;

[0092] Preparation of the eighth component:

[0093] One or a mixture of N-methyldiethanolamine, diisopropanolamine, diethanolamine, ethanolamine, and ethylene glycol.

[0094] It also includes heterocyclic amine derivatives, which are mainly composed of heterocyclic amine derivatives with steric hindrance effects; the heterocyclic amine derivatives are one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-1-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylaminodiethyl ether.

[0095] The catalyst is a mixture of one or more of amine-borate, glycine or sodium tartrate; wherein the amine-borate is a salt produced by the reaction of amine and boric acid, such as NN-dimethylaniline tetrakis(pentafluorobenzene)borate or N-sulfonamide borate.

[0096] The absorbent also includes an activator, a stabilizer, a scale inhibitor and dispersant, and an organic solvent; the activator is a mixture of one or more of phosphoric acid, dipotassium hydrogen phosphate, and sodium acid pyrophosphate; the stabilizer is a mixture of one or more of organic acids such as phosphite, polyol, rosin acid, and tall oil; the solvent is a mixture of one or more of ethers such as methanol, isopropyl ether, and petroleum ether, and alkanes.

[0097] When the above acid liquid hydrogen sulfide absorbent is used to absorb hydrogen sulfide, the steps are as follows:

[0098] Step 1: Mix 5% of the first component, 5% of the second component, 5% of the third component, 5% of the fourth component, 5% of the fifth component, 5% of the sixth component, 5% of the seventh component, 5% of the eighth component, and 10% of 1,3-di(dimethylamino)-2-propanol;

[0099] Step 2: Add 1% amine-borate, 1.0% glycine;

[0100] Step 3: Add 1% dipotassium hydrogen phosphate and 1% sodium acid pyrophosphate;

[0101] Step 4: Add 0.5% rosin acid and 0.5% tall oil;

[0102] Step 5: Add 3.0% of the carboxylate-sulfonate-nonionic terpolymer.

[0103] Step 6: 3.5% of the above mixture is added into the acid solution system: 15% HCl + 2% citric acid + 2% corrosion inhibitor + 1.5% organic quaternary ammonium salt clay stabilizer + 0.1% fluorocarbon surfactant. The test shows that the desulfurization rate of the mixed liquid is 95.1%.

[0104] Example 3

[0105] The absorbent of this embodiment includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, an eighth component, a heterocyclic amine derivative with a steric hindrance effect and a catalyst; and the mass percentages of the components are: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with a steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

[0106] Preparation of the first component: 0.1 mol of cyanuric chloride, 0.3 mol of m-dichlorobenzene and 0.2 mol of acetone as main reactants are placed in a reaction kettle, and 0.05 mol of ammonium chloride, 0.1 mol of propionic acid, 0.1 mol of glycerol, 0.2 mol of polyol and 0.1 mol of polyamine are gradually added dropwise under alkaline conditions of pH 8, reaction temperature 60°C and reaction time 4 hours;

[0107] Preparation of the second component: caprolactam-bromobutyltriethylenediamine ionic liquid

[0108] (1) 0.1 mol of n-butyl bromide, 0.3 mol of ethyl acetate and 0.2 mol of triethylenediamine are placed in a round-bottom flask, heated in a water bath at a reaction temperature of 80° C., and refluxed for 20 hours until the liquid in the round-bottom flask turns milky white. The powder is filtered to obtain a white powder, and then most of the solvent is removed by vacuum distillation using a rotary evaporator. The powder is then placed in an electric heated air drying oven and dried at 80° C. for 48 hours to remove moisture and the remaining organic solvent, thereby obtaining n-butyl triethylenediamine bromide;

[0109] (2) The obtained triethylenediamine salt was mixed with 0.4 mol of caprolactam in different proportions, added to a round-bottom flask with a stirring rotor, and the round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer for full stirring. The reaction temperature was 80°C, the reaction time was 80 min, and the stirring speed was 90 rpm. The stirred reactor was started to start the reaction. After the reaction was completed, caprolactam-bromobutyltriethylenediamine ionic liquid was obtained;

[0110] Preparation of the third component: 1.0 mol of triethylamine is placed in a 1L reactor, 250 mL of anhydrous ethanol is added, and 1.0 mol of n-butyl bromide is added under stirring, and the mixture is refluxed at 100°C for 12 hours. After the reaction is completed, the solvent is evaporated to precipitate white crystals, which are filtered and dried to obtain butyl triethyl ammonium bromide crystals with a yield of about 85%; 0.8 mol of butyl triethyl ammonium bromide and 0.8 mol of potassium hydroxide are respectively dissolved in a certain volume of anhydrous ethanol, and the potassium hydroxide solution is slowly added to the butyl triethyl ammonium bromide solution until the pH is 8 under sufficient stirring, and the mixture is reacted at room temperature for 8 hours, and the potassium bromide precipitate is filtered to obtain the desired solution;

[0111] 1.3 mol of glycine was placed in a reactor, and 150 mL of distilled water was added. At room temperature, butyl triethyl ammonium base solution was slowly added to the reactor while stirring. The reaction was carried out for 3 hours. The solvent and water were removed by evaporation and concentration. The insoluble matter was removed by filtration to obtain a crude product of butyl triethyl glycine ionic liquid. 100 mL of a 1:1 mixed solvent of acetonitrile and chloroform was added to the crude product to dissolve it, the insoluble matter was removed by filtration, the solvent was recovered by evaporation, and the desired ionic liquid was obtained by vacuum drying.

[0112] Preparation of the fourth component: (1) CPL and TBAB were mixed in a molar ratio of 1:1.4, and placed in a round-bottom flask. The round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer, and heated and stirred at a reaction temperature of 90° C. and a stirring speed of 80 rpm until a light yellow transparent viscous liquid was obtained. The reaction time was 90 min. After the reaction was completed, the mixture was placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0113] (2) Weigh urea and choline chloride in a 1:1 molar ratio, add them into a round-bottom flask, place them in a heat-collecting constant temperature heating magnetic stirrer and stir them thoroughly. The reaction temperature is 80° C. and the reaction time is 90 min. After the reaction is completed, urea choline chloride ionic liquid is obtained, which is placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0114] The fifth component: 1.2 mol N, N, N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine + 1.5 mol N, N, N-1.3.5 trimethylhexahydro-s-triazine.

[0115] The sixth component is EDTANa-Fe: dissolve 9.5 g of EDTANa2 in 100 mL of 70°C deionized water, pour into a 250 mL round-bottom flask after complete dissolution, add 10 g of freshly prepared Fe(OH)3 under constant stirring, adjust the pH to 8, react at a constant temperature in a boiling water bath for 2 hours, filter while hot, decompress the filtrate and concentrate it to a viscous state, cool it and wash it three times with anhydrous ethanol.

[0116] The seventh component: the absorbent is compounded according to m(oxazolidine, g):m(glyoxal, g)=1.4:1.0 and then used;

[0117] Eighth component: 0.2 mol diethanolamine + 0.5 mol ethylene glycol.

[0118] The heterocyclic amine derivatives are composed of heterocyclic amine derivatives with steric hindrance effect; the steric hindered amine is one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-1-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylamino diethyl ether.

[0119] When the above acid liquid hydrogen sulfide absorbent is used to absorb hydrogen sulfide, the steps are as follows:

[0120] Step 1: 3% of the first component, 4% of the second component, 2% of the third component, 3% of the fourth component, 5% of the fifth component, 6% of the sixth component, 2% of the seventh component, 5% of the eighth component, 10% of 1,3-di(dimethylamino)-2-propanol, and 15% of 1,3-di(tert-butylamino)-2-propanol are mixed;

[0121] Step 2: Add 1% sodium tartrate;

[0122] Step 3: Add 2% phosphoric acid and 1% dipotassium hydrogen phosphate;

[0123] Step 4: Add 0.5% phosphite;

[0124] Step 5: Add 2.0% acrylic acid-acrylate-phosphoric acid-sulfonate copolymer;

[0125] Step 6: Add 0.5% of the above mixture into an acid solution system: 15% HCl + 2% citric acid + 2% corrosion inhibitor + 1.5% organic quaternary ammonium salt clay stabilizer + 0.1% fluorocarbon surfactant. The test shows that the desulfurization rate of the mixed liquid is 95.7%.

[0126] Embodiment 4:

[0127] The absorbent of this embodiment includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, an eighth component, a heterocyclic amine derivative with a steric hindrance effect and a catalyst; and the mass percentages of the components are: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with a steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

[0128] Preparation of the first component: 0.1 mol of cyanuric chloride, 0.3 mol of m-dichlorobenzene and 0.1 mol of acetone as main reactants are placed in a reaction kettle, and 0.2 mol of ammonium chloride, 0.3 mol of propionic acid, 0.1 mol of glycerol, 0.1 mol of polyol and 0.1 mol of polyamine are gradually added dropwise, under alkaline conditions of pH 8, reaction temperature 80°C and reaction time 4 hours;

[0129] Preparation of the second component: caprolactam-bromobutyltriethylenediamine ionic liquid

[0130] (1) 0.1 mol of n-butyl bromide, 0.3 mol of ethyl acetate and 0.4 mol of triethylenediamine are placed in a round-bottom flask, heated in a water bath at a reaction temperature of 90° C., and refluxed for 20 hours until the liquid in the round-bottom flask turns milky white. The powder is filtered to obtain a white powder, and then most of the solvent is removed by vacuum distillation using a rotary evaporator. The powder is then placed in an electric heating blast drying oven and dried at 80° C. for 48 hours to remove water and the remaining organic solvent, thereby obtaining n-butyl triethylenediamine bromide;

[0131] (2) The obtained triethylenediamine salt is mixed with 0.3 mol of caprolactam, and the mixture is added to a round-bottom flask equipped with a stirring rotor. The round-bottom flask is placed in a heat-collecting constant temperature heating magnetic stirrer and stirred thoroughly. The reaction temperature is 80° C., the reaction time is 80 min, and the stirring speed is 90 rpm. The stirred reactor is started to initiate the reaction. After the reaction is completed, caprolactam-bromobutyltriethylenediamine ionic liquid is obtained.

[0132] Preparation of the third component: 1.0 mol of triethylamine is placed in a 1L reactor, 250 mL of anhydrous ethanol is added, and 2.0 mol of n-butyl bromide is added under stirring, and the mixture is refluxed at 100°C for 12 hours. After the reaction is completed, the solvent is evaporated to precipitate white crystals, which are filtered and dried to obtain butyl triethyl ammonium bromide crystals with a yield of about 85%; 0.8 mol of butyl triethyl ammonium bromide and 0.8 mol of potassium hydroxide are respectively dissolved in a certain volume of anhydrous ethanol, and the potassium hydroxide solution is slowly added to the butyl triethyl ammonium bromide solution until the pH is 9 under sufficient stirring, and the mixture is reacted at room temperature for 8 hours, and the potassium bromide precipitate is filtered to obtain the desired solution;

[0133] 1.5 mol of glycine was placed in a reactor, and 150 mL of distilled water was added. At room temperature, butyl triethyl ammonium base solution was slowly added to the reactor while stirring. The reaction was carried out for 3 hours. The solvent and water were removed by evaporation and concentration. The insoluble matter was removed by filtration to obtain a crude product of butyl triethyl glycine ionic liquid. 100 mL of a 1:3 mixed solvent of acetonitrile and chloroform was added to the crude product to dissolve it, the insoluble matter was removed by filtration, the solvent was recovered by evaporation, and the desired ionic liquid was obtained by vacuum drying.

[0134] Preparation of the fourth component: (1) CPL and TBAB were mixed in a molar ratio of 1:1.9, and placed in a round-bottom flask. The round-bottom flask was placed in a heat-collecting constant temperature heating magnetic stirrer, and heated and stirred at a reaction temperature of 90° C. and a stirring speed of 90 rpm until a light yellow transparent viscous liquid was obtained. The reaction time was 90 min. After the reaction was completed, the mixture was placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0135] (2) Weigh urea and choline chloride in a molar ratio of 1:1, add them into a round-bottom flask, place them in a heat-collecting constant temperature heating magnetic stirrer and stir them thoroughly. The reaction temperature is 80° C. and the reaction time is 90 min. After the reaction is completed, urea choline chloride ionic liquid is obtained, which is placed in a vacuum drying oven for drying, cooled, placed in a desiccator, and stored at room temperature;

[0136] The fifth component: 1.9 mol N, N, N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine + 1.2 mol N, N, N-1.3.5 trimethylhexahydro-s-triazine.

[0137] The sixth component is EDTANa-Fe, and its preparation method is as follows: dissolve 12.5g of EDTANa2 in 100mL of 70°C deionized water, pour into a 250mL round-bottom flask after complete dissolution, add 10g of freshly prepared Fe(OH)3 under constant stirring, adjust the pH to 8, react at a constant temperature in a boiling water bath for 2h, filter while hot, decompress and concentrate the filtrate to a viscous state, cool and wash with anhydrous ethanol 3 times.

[0138] The seventh component is: the absorbent is compounded according to m (oxazolidine, g): m (glyoxal, g) = 1.9:1.0 and then used.

[0139] The eighth component is 0.4 mol diethanolamine + 0.9 mol ethylene glycol.

[0140] The heterocyclic amine derivatives are mainly composed of heterocyclic amine derivatives with steric hindrance effects; one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-1-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylamino diethyl ether can be used.

[0141] When the above acid liquid hydrogen sulfide absorbent is used to absorb hydrogen sulfide, the steps are as follows:

[0142] Step 1: 1% of the first component, 6% of the second component, 3% of the third component, 4% of the fourth component, 7% of the fifth component, 5% of the sixth component, 2% of the seventh component, 5% of the eighth component, 10% of 1,3-di(dimethylamino)-2-propanol, and 15% of 1,3-di(tert-butylamino)-2-propanol are mixed;

[0143] Step 2: Add 1% sodium tartrate;

[0144] Step 3: Add 2% phosphoric acid and 1% dipotassium hydrogen phosphate;

[0145] Step 4: Add 1.5% phosphite;

[0146] Step 5: Add 1.0% acrylic acid-acrylate-phosphoric acid-sulfonate copolymer;

[0147] Step 6: Add 4.0% of the above mixture into an acid solution system: 15% HCl + 2% citric acid + 2% corrosion inhibitor + 1.5% organic quaternary ammonium salt clay stabilizer + 0.1% fluorocarbon surfactant. The test shows that the desulfurization rate of the mixed liquid is 96.1%.

[0148] The acid liquid hydrogen sulfide absorbents in the above Examples 2, 3, and 4 were subjected to desulfurization tests, and BAKE (liquid), SL-2 (liquid), and sponge iron were used as comparative absorbents to carry out desulfurization tests. The results are shown in Table 1:

[0149] Table 1 Comparison of hydrogen sulfide removal rates

[0150] Desulfurizer Addition amount / % Sodium sulfide dosage / ml HCl dosage / % Hydrogen sulfide removal rate / % Example 2 1.5 20 20 95.6 Example 2 6.0 80 20 95.2 Example 3 3.0 40 20 96.3 Example 3 5.0 70 20 95.8 Example 4 4.5 60 20 95.3 Example 4 5.0 80 20 95.6 BAKE(liquid) 2.0 20 20 90.6 SL-2(Liquid) 2.0 20 20 92.5 Sponge Iron 1.5 20 20 89.6

[0151] It can be seen from Table 1 that when the usage amount is the same, or the usage amount of the acid liquid hydrogen sulfide of the present invention is less, the acid liquid hydrogen sulfide absorbent of the present invention has a hydrogen sulfide removal rate of more than 95%, while the other three existing absorbents have a hydrogen sulfide removal rate of about 90%, which greatly improves the desulfurization effect.

[0152] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. Acid liquid hydrogen sulfide absorbent, characterized in that: The absorbent includes a heterocyclic amine derivative having a steric hindrance effect and a catalyst; Among them, the heterocyclic amine derivative with steric hindrance effect is one or more of 1,3-di(dimethylamine)-2-propanol, 1,3-di(diethylamine)-2-propanol, 1,3-di(tert-butylamino)-2-propanol, tert-butylaminoethoxyethanol, and di-tert-butylamino diethyl ether; The absorbent also includes a first component, a second component, a third component, a fourth component, a fifth component, a sixth component, a seventh component, and an eighth component, and the mass percentage of each component is: the first component accounts for 1% to 5%; the second component accounts for 4% to 6%; the third component accounts for 2% to 5%; the fourth component accounts for 3% to 5%; the fifth component accounts for 5% to 7%; the sixth component accounts for 5% to 6%; the seventh component accounts for 2% to 7%; the eighth component accounts for 5%; the heterocyclic amine derivative with steric hindrance effect accounts for 10% to 25%; the catalyst: 1% to 2%; and the remaining components are water.

2. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The first component is a nitrogen-containing heterocyclic compound, and the preparation method of the first component is: Put cyanuric chloride, m-dichlorobenzene and acetone into a reaction kettle, gradually add ammonium chloride, propionic acid, glycerol, polyol and polyamine mixed solvent, select the ratio of main reactants, and react under alkaline conditions to obtain the first component.

3. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The second component is caprolactam-bromobutyltriethylenediamine ionic liquid; the preparation method of the second component is: Heating n-butyl bromide, ethyl acetate and triethylenediamine in a molar ratio of 1:1:1 to 1:3:3 to react and obtain n-butyl triethylenediamine bromide; The obtained triethylenediamine salt is mixed with caprolactam in a molar ratio of 1:2 to 1:4, and heated for reaction to obtain caprolactam-bromo-n-butyltriethylenediamine ionic liquid.

4. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The third component is butyl triethyl quaternary ammonium glycine ionic liquid, and the preparation method of the third component is: (1) Obtaining butyl triethyl quaternary ammonium base: (2) Obtaining butyl triethyl ammonium glycine ionic liquid: reacting glycine with a butyl triethyl ammonium alkali solution to obtain a crude product of butyl triethyl glycine ionic liquid, and purifying the crude product of butyl triethyl glycine ionic liquid to obtain butyl triethyl ammonium glycine ionic liquid.

5. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The fourth component is caprolactam-tetrabutylammonium halide ionic liquid and urea-choline chloride ionic liquid, and the preparation method of the fourth component is: Caprolactam-tetrabutylammonium halide ionic liquid can be prepared by a one-step reaction of CPL and TBAX; urea-choline chloride ionic liquid can be prepared by a one-step reaction of urea and choline chloride.

6. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The fifth component is one or a mixture of 1,3,5-tris-(2-hydroxyethyl)-hexahydro-s-triazine, N-methyl-3,5-di-(2-hydroxyethyl)-hexahydro-s-triazine, N,N,N-1.3-dimethyl-5-(2-hydroxyethyl)-hexahydro-s-triazine, and N,N,N-1.3.5 trimethyl-hexahydro-s-triazine.

7. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The sixth component is ethylenediaminetetraacetic acid sodium iron salt EDTANa-Fe.

8. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The seventh component is a compound of oxazolidine and glyoxal in a mass ratio of 1.5:1.0; the eighth component is a mixture of one or more of N-methyldiethanolamine, diisopropanolamine, diethanolamine, ethanolamine, and ethylene glycol.

9. The acid liquid hydrogen sulfide absorbent according to claim 1, characterized in that: The catalyst is one or a mixture of amine-borate, glycine or sodium tartrate.

10. The use of the acid liquid hydrogen sulfide absorbent according to any one of claims 1 to 9, characterized in that: The acid liquid hydrogen sulfide absorbent is used at a mass percentage of 0.5-6% to absorb hydrogen sulfide during surface process pipelines and downhole acidification operations.

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