Sulfur dissolving agent and application thereof

Abstract

The invention relates to the technical field of corrosion and protection of chemical agents and metal materials for oil and gas fields, and discloses a sulfur dissolving agent and application thereof. The sulfur dissolving agent comprises C2-C10 alcohol amine, a catalyst and a dispersing agent; wherein the catalyst is quaternary ammonium salt and / or crown ether, and the dispersing agent is an anionic dispersing agent and / or a water-soluble high-molecular compound. The sulfur dissolving agent is free of pungent smell and stink, and the sulfur removal process does not corrode and damage the device. The sulfur dissolving agent disclosed by the invention is used for sulfur dissolving reaction in the sulfur dissolving system disclosed by the invention, and is high in sulfur removal efficiency, short in time, simple, convenient and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of corrosion and protection of chemical agents and metal materials for oil and gas fields, and particularly relates to a sulfur dissolving agent and application thereof. BACKGROUND

[0002] With the progress of oil and gas field development technology, domestic and foreign sulfur-containing gas fields are being explored and developed. In the development process of the sulfur-containing gas field, high concentration of hydrogen sulfide is often associated with natural gas, and hydrogen sulfide is a highly toxic gas with strong harmfulness. Once the sulfur-containing natural gas leaks, it will pose a threat to the safety and life of the on-site personnel and surrounding residents. Therefore, corresponding capture and elimination processes are matched in the development process, and the main principle is to oxidize the sulfur element of hydrogen sulfide into elemental sulfur for desulfurization treatment. For low-concentration hydrogen sulfide gas fields, the hydrogen sulfide is mainly removed by using wet oxidation-reduction complex iron in the desulfurization station. The complex iron solution can oxidize the sulfur element in the hydrogen sulfide into elemental sulfur, but the hydrophobic fine sulfur particles generated in the chemical process are easily adhered to the inner wall of the device, pipeline, valve and wall, causing the blockage of the equipment and pipeline and affecting the operation of the overall process and device, causing potential risks and leading to shutdown. If the sulfur plugging in the desulfurization device is serious, sulfur may be brought to the subsequent purification separator, and deposited in the purification separator. In severe cases, the outlet wire mesh demister of the purification separator is blocked, which restricts the desulfurization treatment capacity of the device. By adding a sulfur dissolving agent, the sulfur is dissolved and dispersed in the sulfur dissolving agent, and then discharged with the sulfur dissolving agent, which can achieve good sulfur plugging treatment effect, reduce the frequency of on-site maintenance, and improve production efficiency.

[0003] At present, the main solution to elemental sulfur deposition is to add a sulfur dissolving agent, which is generally CS2, dimethyl disulfide (DMDS) and diaryl disulfide (DADS), etc. The common shortcomings of these sulfur dissolving agents are strong odor, foul odor and high toxicity, which are not green and environmentally friendly products.

[0004] Patent application No. 201610830605.2 discloses a cleaning agent suitable for viscous sulfur-containing scale in high-sulfur gas field gathering and transportation system, which can efficiently dissolve and clean the viscous sulfur-containing blockage in the high-sulfur gas field gathering and transportation system at a relatively low temperature. The pipeline or equipment is soaked in a 10-20wt% aqueous solution for 6-8 hours, the cleaning solution is circulated for 4-6 hours, and the cleaning endpoint is determined by sampling and testing every 1 hour. This method needs to stop production, isolate and purge the construction object, which affects production, and the cleaning time is relatively long. Moreover, the cleaned solution is not recycled, which will affect the production of subsequent purification or water treatment systems.

[0005] Invention patent application No. 201811044463.2 discloses a cleaning agent for sulfur-containing scale in high-sulfur gas field sour gas gathering pipeline and a use method. By adding the cleaning agent to the high-sulfur gas field sour gas gathering pipeline, the deposited sulfur-containing scale in the sour gas gathering pipeline can be cleaned out of the pipeline through soaking and circulation for a certain period of time, thereby solving the problems of scale blockage and corrosion of the sour gas gathering pipeline. The main agent is sodium sulfide or sodium hydrosulfide, which reacts with elemental sulfur, the main substance in the sulfur-containing scale, to generate sodium polysulfide, which then dissolves and removes the elemental sulfur. The soaking time is 10-12 h, the circulation time is 4-6 h, and the single operation time is 30 h. The generated sodium polysulfide is harmful to the environment and corrosive to the equipment. The cleaning process requires production to be stopped, the construction object to be isolated and purged, which affects production, and the cleaning time is long. Moreover, the cleaned solution is not recycled, which affects the production of subsequent purification or water treatment systems.

[0006] Utility model patent application No. 201621055845.1 discloses a device for separating sulfur from a desulfurization solution, which comprises a cyclone separator, a ceramic plate filter, a conveying device, and a flushing device. The liquid inlet angle of the cyclone separator is 30-80 degrees, and the lower end is conical. The number of ceramic plate filters is 2-5, and the lower end of the cyclone separator is connected to the ceramic plate filter. The cyclone separator, the ceramic plate filter, the pump, and the flushing device are used to separate sulfur from the wet oxidation desulfurization solution. This method has poor separation effect on desulfurization solutions with fine sulfur particles.

[0007] Therefore, it is necessary to develop a sulfur-dissolving agent with no irritating odor, no foul odor, and both sulfur-dissolving and dispersing functions, which can be added without affecting the production of the purification separator, and can dissolve and disperse sulfur within 30-60 min. The solution after dissolving sulfur has good flowability and can be easily removed from the device. SUMMARY

[0008] The purpose of the present application is to overcome the problems of existing technology, such as strong odor, foul odor, high toxicity, complex sulfur removal process, and impact on production. The present application provides a sulfur-dissolving agent and its application, which has no irritating odor and no foul odor, and the sulfur removal process does not cause corrosion and damage to the device. Moreover, the sulfur-dissolving system in the present application does not need to stop production during the sulfur-dissolving process, and the sulfur-dissolving agent, sulfur, and recovery agent are recycled and utilized. The amount of deposited sulfur in the device can be calculated according to the amount of recovered sulfur, which is simple and efficient.

[0009] To achieve the above-mentioned purpose, the present application provides a sulfur-dissolving agent, which comprises C2-C10 alcohol amine, a catalyst, and a dispersing agent.

[0010] The catalyst is a quaternary ammonium salt and / or a crown ether, and the dispersant is an anionic dispersant and / or a water-soluble high-molecular compound.

[0011] Preferably, the weight ratio of the C2-C10 alcohol amine, the catalyst and the dispersant is 1:0.05-0.1:0.1-0.2.

[0012] Preferably, the weight ratio of the C2-C10 alcohol amine, the catalyst and the dispersant is 1:0.07-0.08:0.12-0.16.

[0013] Preferably, the C2-C10 alcohol amine is selected from one or more of ethanolamine, diethanolamine, triethanolamine and diethyl ethanolamine.

[0014] Preferably, the quaternary ammonium salt is selected from one or more of tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate and tetradecyl trimethylammonium chloride.

[0015] Preferably, the crown ether is 18-crown-6 and / or 15-crown-5.

[0016] Preferably, the dispersant is selected from one or more of sodium lauryl sulfate, sodium alcohol ether carboxylate and sodium polyacrylate.

[0017] Preferably, the sulfur dissolving agent further comprises a surfactant, and the weight ratio of the C2-C10 alcohol amine and the surfactant is 1:0.05-1.

[0018] Preferably, the weight ratio of the C2-C10 alcohol amine and the surfactant is 1:0.06-0.09.

[0019] Preferably, the surfactant is selected from one or more of an amphoteric surfactant, a non-ionic surfactant and an anionic surfactant.

[0020] The second aspect of the present application provides the use of the above-mentioned sulfur dissolving agent in the exploitation of a sulfur-containing gas field.

[0021] The third aspect of the present application provides a method for dissolving sulfur, which comprises: delivering the above-mentioned sulfur dissolving agent to a sulfur removal device in the exploitation of a sulfur-containing gas field, and allowing the sulfur dissolving agent to contact with elemental sulfur in the sulfur removal device to dissolve the sulfur, and then mixing the solution after the sulfur is dissolved with a recovery agent to recover.

[0022] Preferably, the recovery agent is a mixture of alcohol and water.

[0023] Preferably, the weight ratio of the sulfur dissolving agent and the elemental sulfur is 5-6:10.

[0024] Preferably, the weight ratio of the sulfur dissolving agent and the recovery agent is 1-5:1.

[0025] Preferably, the time of the sulfur dissolution reaction is 20-180 min.

[0026] Preferably, the content of the alcohol in the recovery agent is 5-20 wt%.

[0027] Preferably, the sulfur dissolution method is performed in a sulfur dissolution system;

[0028] The sulfur dissolution system comprises a purification separation unit.

[0029] The purification separation unit comprises an ejector and a sulfur removal device.

[0030] The ejector has a sulfur dissolution agent inlet and an atomization chamber.

[0031] The sulfur dissolution agent outlet of the ejector is connected to the sulfur dissolution agent inlet of the sulfur removal device.

[0032] Preferably, the sulfur removal device also has a solution observation port.

[0033] The sulfur dissolution system further comprises a recovery unit connected to the purification separation unit.

[0034] Preferably, the recovery unit comprises a recovery tank, and the recovery tank has a recovery agent inlet.

[0035] The solution outlet of the sulfur removal device is connected to the solution inlet of the recovery tank.

[0036] Preferably, the sulfur dissolution system further comprises a filtration unit connected to the recovery unit.

[0037] Preferably, the filtration unit comprises a filtration tank, and the solid-liquid outlet of the recovery tank is connected to the solid-liquid inlet of the filtration tank.

[0038] Preferably, the sulfur dissolution system further comprises a vacuum distillation unit connected to the filtration unit.

[0039] Preferably, the vacuum distillation unit comprises a self-heating storage tank, a condenser tube, a recovery agent recovery tank, and a vacuum pump.

[0040] The recovery agent outlet of the storage tank is connected to the recovery agent inlet of the condenser tube, the recovery agent outlet of the condenser tube is connected to the recovery agent inlet of the recovery agent recovery tank, and the recovery agent recovery tank is connected to the vacuum pump.

[0041] The mixed solution outlet of the filtration tank is connected to the input end of the vacuum distillation unit.

[0042] Preferably, the sulfur dissolution system further comprises a sulfur dissolution agent storage unit connected to the purification separation unit.

[0043] Preferably, the sulfur solvent storage unit comprises a sulfur solvent storage tank and a power pump connected in sequence;

[0044] The power pump is connected with the sulfur solvent inlet of the injector.

[0045] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0046] (1) The sulfur solvent of the present application has no irritating odor and no foul odor, and has no corrosive and destructive effect on metals and rubber materials, and at the same time has the functions of dissolving sulfur and dispersing, and has a wide range of use and is convenient to use;

[0047] (2) The sulfur dissolving method of the present application can continuously fill the required sulfur removal device, without stopping production, and the sulfur dissolving method is simple and efficient;

[0048] (3) The sulfur dissolving method of the present application can realize the recovery of sulfur, sulfur solvent and recovery agent, and according to the amount of recovered sulfur, the amount of sulfur deposition in the device can be calculated, so as to facilitate the grasping of the total amount of sulfur deposition in the device. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a sulfur dissolving system schematic diagram of a specific embodiment of the present application;

[0050] Figure 2 is a schematic diagram of an injector of a sulfur dissolving system of a specific embodiment of the present application;

[0051] Figure 3 is a schematic diagram of a sulfur removal device of a sulfur dissolving system of a specific embodiment of the present application;

[0052] Figure 4 is a schematic diagram of a vacuum distillation unit of a sulfur dissolving system of a specific embodiment of the present application.

[0053] REFERENCE SIGNS

[0054] 5 vacuum distillation unit

[0055] 11 sulfur solvent storage tank 12 power pump

[0056] 21 injector 22 sulfur removal device

[0057] 31 recovery tank 41 filter tank

[0058] 51 self-heating storage tank 52 condenser pipe

[0059] 53 recovery agent recovery tank 54 vacuum pump

[0060] 111 fifth valve 112 fourth check valve

[0061] 211 sulfur solvent inlet 212 atomizing chamber

[0062] 221 solution outlet 222 solution observation port

[0063] 223 first valve 224 second valve

[0064] 311 recovery agent inlet 312 third valve

[0065] 313 first check valve 411 second check valve

[0066] 531 third check valve 532 fourth valve DETAILED DESCRIPTION

[0067] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the present application.

[0068] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are provided as approximate descriptions of the ranges and are understood to be open-ended. Each range disclosed herein is to be understood to include individual values, and sub-ranges, falling within the stated range. In other words, any value or sub-range within the range is specifically disclosed. The stated ranges and values are understood to be approximate and are provided for explanation and non-limiting description of the scope of the disclosure.

[0069] In one aspect, the present application provides a sulfur dissolving agent, which comprises a C2-C10 alcohol amine, a catalyst and a dispersant.

[0070] In one aspect, the present application provides a sulfur dissolving agent, which comprises a C2-C10 alcohol amine, a catalyst and a dispersant.

[0071] In a preferred embodiment, in order to further improve the sulfur dissolving effect and dispersibility of the sulfur dissolving agent, the weight ratio of the C2-C10 alcohol amine, the catalyst and the dispersant is 1:0.05-0.1:0.1-0.2, more preferably 1:0.07-0.08:0.12-0.16; specifically, the weight ratio of the C2-C10 alcohol amine, the catalyst and the dispersant can be 1:0.07:0.12, 1:0.07:0.13, 1:0.07:0.14, 1:0.07:0.15, 1:0.07:0.16, 1:0.08:0.12, 1:0.08:0.13, 1:0.08:0.14, 1:0.08:0.15 or 1:0.08:0.16.

[0072] In the present application, there is no special requirement for the C2-C10 alcohol amine, and the commonly used ones in the art can be used. In the preferred embodiment, in order to further improve the sulfur dissolving effect of the sulfur dissolving agent, the C2-C10 alcohol amine is selected from one or more of ethanolamine, diethanolamine, triethanolamine and diethyl ethanolamine.

[0073] In the present application, there is no special requirement for the quaternary ammonium salt, and the commonly used ones in the art can be used. In the preferred embodiment, in order to further improve the sulfur dissolving effect of the sulfur dissolving agent, the quaternary ammonium salt is selected from one or more of tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate and tetradecyl trimethyl ammonium chloride.

[0074] In the present application, there is no special requirement for the crown ether, and the commonly used ones in the art can be used. In the preferred embodiment, in order to further improve the sulfur dissolving effect of the sulfur dissolving agent, the crown ether is 18-crown-6 and / or 15-crown-5.

[0075] In the preferred embodiment, in order to further improve the dispersibility of the sulfur dissolving agent, the dispersant is selected from one or more of dodecanol sodium sulfate, alcohol ether carboxylic acid sodium and polyacrylic acid sodium; wherein the relative molecular weight of the polyacrylic acid sodium is 1000-5000.

[0076] In the preferred embodiment, in order to reduce the surface tension of the sulfur dissolving agent, the sulfur dissolving agent further comprises a surfactant, and the weight ratio of the use amount of the C2-C10 alcohol amine to the surfactant is 1:0.05-1, more preferably 1:0.06-0.09; specifically, the weight ratio of the use amount of the C2-C10 alcohol amine to the surfactant can be 1:0.06, 1:0.07, 1:0.08 or 1:0.09.

[0077] In the preferred embodiment, in order to further reduce the surface tension of the sulfur dissolving agent, the surfactant is selected from one or more of amphoteric surfactants, non-ionic surfactants and anionic surfactants.

[0078] In the preferred embodiment, the amphoteric surfactant is selected from one or more of dodecyl sulfopropyl betaine, alkyl dimethyl hydroxy propyl phospholipid betaine and alkyl disaccharide.

[0079] In the specific embodiment, the non-ionic surfactant is alcohol ether trisaccharide.

[0080] In the specific embodiment, the anionic surfactant is monoalkyl phosphate.

[0081] The second aspect of the present application provides the use of the above-mentioned sulfur dissolving agent in the exploitation of sulfur-containing gas fields.

[0082] The third aspect of the present application provides a method for dissolving sulfur, which comprises: delivering the above-mentioned sulfur dissolving agent to a sulfur removing device in the exploitation of a sulfur-containing gas field, and allowing the sulfur dissolving agent to contact with elemental sulfur in the sulfur removing device to dissolve the sulfur, and then mixing the solution after the sulfur dissolving with a recovery agent to recover the sulfur;

[0083] The recovery agent is a mixture of alcohol and water.

[0084] In the present application, there is no special requirement for the alcohol, and the alcohol commonly used in the art can be used, for example, the alcohol can be ethanol.

[0085] In the preferred embodiment, in order to improve the sulfur dissolving efficiency of the sulfur dissolving reaction, the weight ratio of the sulfur dissolving agent to the elemental sulfur is 5-6:10; specifically, the weight ratio of the sulfur dissolving agent to the elemental sulfur can be 5:10, 5.5:10 or 6:10.

[0086] In the preferred embodiment, in order to improve the recovery rate of the elemental sulfur, the weight ratio of the amount of the sulfur dissolving agent to the amount of the recovery agent is 1-5:1; specifically, the weight ratio of the amount of the sulfur dissolving agent to the amount of the recovery agent can be 1:1, 2:1, 3:1, 4:1 or 5:1.

[0087] In the preferred embodiment, in order to ensure that the sulfur dissolving reaction is sufficient and improve the sulfur removing efficiency, the time of the sulfur dissolving reaction is 20-180 min; specifically, the time of the sulfur dissolving reaction can be 20 min, 30 min, 40 min, 45 min, 60 min, 120 min, 150 min or 180 min.

[0088] In the preferred embodiment, in order to improve the recovery efficiency of the recovery agent, the content of the alcohol in the recovery agent is 5-20 wt%; specifically, the content of the alcohol in the recovery agent can be 5 wt%, 10 wt%, 15 wt% or 20 wt%.

[0089] In the present application, the recovery rate of the recovery agent for recovering sulfur is 80-90%, the elemental sulfur on the upper part of the filter screen in the filter tank 41 is taken out after the sulfur dissolving reaction is completed, weighed, and the sulfur dissolving amount s is inversely calculated by the obtained weight m of the elemental sulfur, the sulfur dissolving amount s=(2.0-2.2)*m, which is caused by the comprehensive reasons of the recovery rate of the recovery agent, the process loss and the unsaturated amount of sulfur.

[0090] In the present application, there is no special requirement for the alcohol and water in the recovery agent, and the alcohol and water commonly used in the art can be used, for example, the alcohol can be industrial ethanol and the water can be formation water.

[0091] In the preferred embodiment, the method for dissolving sulfur is carried out in a sulfur dissolving system.

[0092] The sulfur dissolving system comprises a purification and separation unit.

[0093] The purification separation unit comprises an injector 21 and a sulfur removal device 22.

[0094] The injector 21 has a sulfur solvent inlet 211 and an atomization chamber 212.

[0095] The sulfur solvent outlet of the injector 21 is connected to the sulfur solvent inlet of the sulfur removal device 22.

[0096] In the present application, the purification separation unit is used for carrying out a sulfur dissolution reaction, the injector 21 atomizes the sulfur solvent, which enters the sulfur removal device 22 in an atomized form, so as to fully contact with the elemental sulfur in the sulfur removal device 22, the sulfur dissolution reaction is more sufficient, the sulfur removal efficiency is high, and the sulfur removal device 22 does not need to be closed for production, which is convenient and efficient.

[0097] In the preferred embodiment, the sulfur solvent is delivered to the injector 21 through the sulfur solvent inlet 211 of the injector 21, the atomization chamber 212 of the injector 21 atomizes the sulfur solvent, and the atomized sulfur solvent enters the sulfur removal device 22 to carry out a sulfur dissolution reaction with the elemental sulfur in the sulfur removal device 22, so as to remove the residual elemental sulfur in the sulfur removal device 22.

[0098] In the present application, the sulfur removal device 22 is a device for removing residual elemental sulfur in the process of exploiting a sulfur-containing gas field.

[0099] In the preferred embodiment, the sulfur removal device 22 also has a solution observation port 222, which is used to periodically take out a small amount of reaction solution during the sulfur dissolution process. Since the sulfur solvent is a colorless and clear liquid, if the taken reaction solution is dark brown, it proves that the sulfur dissolution reaction is sufficient.

[0100] In the specific embodiment, the solution observation port 222 has a second valve 224, and the solution observation port 222 is located at the lower right of the sulfur removal device 22.

[0101] In the preferred embodiment, the sulfur removal device 22 also has a solution outlet 221 for discharging the solution after the sulfur dissolution reaction.

[0102] In the specific embodiment, the solution outlet 221 has a first valve 223, and the solution outlet 221 is located at the bottom of the sulfur removal device 22.

[0103] In the preferred embodiment, the sulfur dissolution system further comprises a recovery unit connected with the purification separation unit. The recovery unit is used for recovering the elemental sulfur, realizing the recycling of the elemental sulfur, and being environmentally friendly and economical.

[0104] In a preferred embodiment, the recovery unit comprises a recovery tank 31, the recovery tank 31 having a recovery agent inlet 311; the solution outlet 221 of the sulfur removal device 22 is connected to the solution inlet of the recovery tank 31. The solution after the sulfurization reaction in the sulfur removal device 22 enters the recovery tank 31, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 and reacts with the solution after the sulfurization reaction, and elemental sulfur is precipitated, thereby realizing the recovery of elemental sulfur.

[0105] In a specific embodiment, the recovery agent inlet 311 further has a third valve 312, and the recovery agent inlet 311 is located at the top of the recovery tank 31.

[0106] In a preferred embodiment, the recovery tank 31 further has a solid-liquid outlet, which is used to discharge elemental sulfur and the mixed solution (sulfurization agent and recovery agent) after the reaction.

[0107] In a specific embodiment, the solid-liquid outlet has a first check valve 313, and the solid-liquid outlet is located at the lower right of the recovery tank 31.

[0108] In a preferred embodiment, the sulfurization system further comprises a filtration unit connected to the recovery unit, and the filtration unit is used to separate elemental sulfur and the mixed solution (sulfurization agent and recovery agent) in the recovery tank 31.

[0109] In a preferred embodiment, the filtration unit comprises a filter tank 41, and the solid-liquid outlet of the recovery tank 31 is connected to the solid-liquid inlet of the filter tank 41, and the mixed solution outlet of the filter tank 41 is connected to the input end of the vacuum distillation unit 5. Elemental sulfur and the mixed solution (sulfurization agent and recovery agent) in the recovery tank 31 enter the filter tank 41 to realize the solid-liquid separation of elemental sulfur and the mixed solution (sulfurization agent and recovery agent).

[0110] In a specific embodiment, the filter tank 41 is provided with a filter screen inside, and after elemental sulfur and the mixed solution (sulfurization agent and recovery agent) enter the filter tank 41 through the filter screen, the elemental sulfur is located at the upper part of the filter screen. The mixed solution (sulfurization agent and recovery agent) passes through the filter screen and enters the vacuum distillation unit 5 through the mixed solution outlet.

[0111] In a specific embodiment, the mixed solution outlet of the filter tank 41 has a second check valve 411, and the mixed solution outlet of the filter tank 41 is located at the lower right of the filter tank 41.

[0112] In a preferred embodiment, the sulfurization system further comprises a vacuum distillation unit 5 connected to the filtration unit, and the vacuum distillation unit 5 is used to recycle the recovery agent and the sulfurization agent.

[0113] In the preferred embodiment, the mixed solution outlet of the filter tank 41 is connected to the input end of the reduced pressure distillation unit 5, and the mixed solution (sulfur solvent and recovery agent) enters the reduced pressure distillation unit 5 through the mixed solution outlet, so as to realize the recycling of the recovery agent and the sulfur solvent.

[0114] In the preferred embodiment, in combination with the description of Figure 4 , the reduced pressure distillation unit 5 comprises a self-heating storage tank 51, a condenser tube 52, a recovery agent recovery tank 53 and a vacuum pump 54; the recovery agent outlet of the self-heating storage tank 51 is connected to the recovery agent inlet of the condenser tube 52, the recovery agent outlet of the condenser tube 52 is connected to the recovery agent inlet of the recovery agent recovery tank 53, and the recovery agent recovery tank 53 is connected to the vacuum pump 54. The elemental sulfur and the reacted mixed solution (sulfur solvent and recovery agent) in the recovery tank 31 enter the self-heating storage tank 51 for heating. Since the boiling point of the recovery agent is lower than that of the sulfur solvent, the recovery agent is evaporated into a gaseous state after heating, and the gaseous recovery agent enters the condenser tube 52 to become liquid after condensation and enters the recovery agent recovery tank 53. The elemental sulfur and the sulfur solvent in the self-heating storage tank 51 are separated by solid-liquid separation and then recovered. The vacuum pump 54 is used for vacuumizing the reduced pressure distillation unit 5.

[0115] In the specific embodiment, a third check valve 531 is arranged on the pipeline connected between the recovery agent recovery tank 53 and the vacuum pump 54, so as to prevent the recovery agent from flowing back to the vacuum pump 54.

[0116] In the preferred embodiment, the recovery agent recovery tank 53 further has a recovery agent outlet for discharging the recovered recovery agent.

[0117] In the specific embodiment, the recovery agent outlet of the recovery agent recovery tank 53 is located at the lower right of the recovery agent recovery tank 53, and the recovery agent outlet of the recovery agent recovery tank 53 has a fourth valve 532.

[0118] In the preferred embodiment, the sulfur dissolving system further comprises a sulfur dissolving agent storage unit connected to the purification separation unit, which is used for storing the sulfur dissolving agent and adding the sulfur dissolving agent to the purification separation unit.

[0119] In the preferred embodiment, the sulfur dissolving agent storage unit comprises a sulfur dissolving agent storage tank 11 and a power pump 12 connected in sequence, and the power pump 12 is connected to the sulfur dissolving agent inlet 211 of the ejector 21, so as to add the sulfur dissolving agent in the sulfur dissolving agent storage tank 11 to the ejector 21.

[0120] In the specific embodiment, a fifth valve 111 is arranged on the pipeline connected between the sulfur dissolving agent outlet of the sulfur dissolving agent storage tank 11 and the power pump 12, and a fourth check valve 112 is arranged on the pipeline connected between the power pump 12 and the sulfur dissolving agent inlet 211 of the ejector 21.

[0121] The application is further illustrated by the following examples. The examples are implemented on the premise of the technical solutions of the application, and detailed implementation modes and specific operation processes are given, but the protection scope of the application is not limited to the following examples.

[0122] In the following examples, the experimental methods are conventional methods in the art unless otherwise specified. The experimental materials used in the following examples are commercially available unless otherwise specified.

[0123] Example 1

[0124] Preparation of the sulfur-dissolving agent A1:

[0125] 1 part by weight of triethanolamine and 0.15 parts by weight of sodium dodecanol sulfate are mixed, then 0.07 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether triose is added to configure 1 t of the sulfur-dissolving agent A1;

[0126] A schematic diagram of the sulfur-dissolving system is shown in Figure 1 and includes, in sequence, a sulfur-dissolving agent storage unit, a purification and separation unit, a recovery unit, a filtration unit, and a vacuum distillation unit 5;

[0127] The sulfur-dissolving agent storage unit includes a sulfur-dissolving agent storage tank 11 and a power pump 12, the sulfur-dissolving agent outlet of the sulfur-dissolving agent storage tank 11 is connected to the sulfur-dissolving agent inlet 211 of the ejector 21, and the power pump 12 is arranged on the pipeline connecting the sulfur-dissolving agent outlet of the sulfur-dissolving agent storage tank 11 and the sulfur-dissolving agent inlet 211 of the ejector 21;

[0128] A fifth valve 111 is arranged on the pipeline connecting the sulfur-dissolving agent outlet of the sulfur-dissolving agent storage tank 11 and the power pump 12, and a fourth check valve 112 is arranged on the pipeline connecting the power pump 12 and the sulfur-dissolving agent inlet 211 of the ejector 21;

[0129] The purification and separation unit includes an ejector 21 and a sulfur-removing device 22, the sulfur-dissolving agent outlet of the ejector 21 is connected to the sulfur-dissolving agent inlet of the sulfur-removing device 22, and the sulfur-removing device 22 is a gas field purification and separation device;

[0130] Referring to Figure 2 , the ejector 21 has a sulfur-dissolving agent inlet 211 and an atomizing chamber 212;

[0131] Referring to Figure 3The sulfur-removing device 22 also has a solution outlet 221 with a first valve 223 and a solution observation port 222 with a second valve 224, the solution outlet 221 is located at the bottom of the sulfur-removing device 22, and the solution observation port 222 is located at the lower right of the sulfur-removing device 22;

[0132] The recovery unit includes a recovery tank 31, and the solution outlet 221 of the sulfur-removing device 22 is connected to the solution inlet of the recovery tank 31;

[0133] The recovery tank 31 has a solid-liquid outlet with a first check valve 313 and a recovery agent inlet 311 with a third valve 312, and the recovery agent inlet 311 is located at the top of the recovery tank 31;

[0134] The filtration unit includes a filter tank 41, and the solid-liquid outlet of the recovery tank 31 is connected to the solid-liquid inlet of the filter tank 41;

[0135] The filter tank 41 is provided with a filter screen inside, and a second check valve 411 is arranged on the connecting pipeline between the solid-liquid outlet of the recovery tank 31 and the solid-liquid inlet of the filter tank 41;

[0136] In combination with the drawings, Figure 4 The input end of the reduced-pressure distillation unit 5 is connected to the mixed solution outlet of the filter tank 41, and the reduced-pressure distillation unit 5 includes a self-heating storage tank 51, a condenser tube 52, a recovery agent recovery tank 53, and a vacuum pump 54;

[0137] The recovery agent outlet of the self-heating storage tank 51 is connected to the recovery agent inlet of the condenser tube 52, the recovery agent outlet of the condenser tube 52 is connected to the recovery agent inlet of the recovery agent recovery tank 53, and the recovery agent recovery tank 53 is connected to the vacuum pump 54;

[0138] A third check valve 531 is arranged on the connecting pipeline between the recovery agent recovery tank 53 and the vacuum pump 54, the recovery agent recovery tank 53 also has a recovery agent outlet located at the lower right of the recovery agent recovery tank 53, and the recovery agent outlet has a fourth valve 532.

[0139] The above-mentioned sulfur-dissolving system is used to perform a sulfur-dissolving reaction, and the specific process includes:

[0140] The fifth valve 111 is opened, and the sulfur-dissolving agent A1 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit by the power pump 12;

[0141] The sulfur-dissolving agent A1 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 2t, the sulfur-dissolving reaction time is 40min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0142] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 15min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 0.2t, wherein the content of the formation water is 80wt%, and the content of the industrial ethanol is 20wt%;

[0143] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized;

[0144] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, the recovery agent evaporates into a gaseous state after being heated, the gaseous recovery agent enters the condenser tube 52 to become a liquid state through condensation, enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced-pressure distillation unit 5.

[0145] Example 2

[0146] The sulfur-dissolving agent A2 is prepared as follows:

[0147] 1 part by weight of ethanolamine and 0.1 part by weight of alcohol ether carboxylate are mixed, then 0.06 parts by weight of tetrabutylammonium chloride is added, and finally 0.05 parts by weight of alkyl diglyceride is added to configure 1t of the sulfur-dissolving agent A2;

[0148] The sulfur-dissolving reaction is performed according to the sulfur-dissolving system in Example 1, and the specific process includes:

[0149] The fifth valve 111 is opened, the sulfur-dissolving agent A2 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit through the power pump 12;

[0150] The sulfur solvent A2 enters the injector 21, the sulfur solvent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur solvent enters the sulfur removal device 22 to react with the elemental sulfur in the sulfur removal device 22. The weight of the elemental sulfur in the sulfur removal device 22 is estimated to be 2t, the sulfur solvent reaction time is 60min, the second valve 224 is opened, a small amount of the sulfur solvent after the reaction is taken, and the color of the sulfur solvent is reddish brown, which proves that the sulfur solvent reaction is sufficient, and the elemental sulfur remaining in the sulfur removal device 22 is removed.

[0151] The first valve 223 is opened, the sulfur solvent after the reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to react with the sulfur solvent after the reaction to precipitate elemental sulfur, wherein the sulfur precipitation reaction time is 20min, the recovery agent is a mixture of formation water and industrial ethanol, and the weight of the mixture is 0.5t, wherein the content of the formation water is 90wt%, and the content of the industrial ethanol is 10wt%.

[0152] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur solvent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0153] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur solvent) enters the self-heating storage tank 51 for heating, because the boiling point of the recovery agent is lower than that of the sulfur solvent, the recovery agent evaporates into a gaseous state after heating, the gaseous recovery agent enters the condenser tube 52 to become a liquid state, enters the recovery agent recovery tank 53, the sulfur solvent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced-pressure distillation unit 5.

[0154] Example 3

[0155] The sulfur solvent A3 is prepared as follows:

[0156] 0.6 parts by weight of diethanolamine, 0.4 parts by weight of diethyl ethanolamine and 0.16 parts by weight of sodium polyacrylate are mixed, then 0.05 parts by weight of 18-crown-6 ether and 0.02 parts by weight of tetradecyl trimethyl ammonium chloride are added, finally 0.02 parts by weight of alcohol ether triose and 0.05 parts by weight of monoalkyl phosphate are added to prepare 1t of the sulfur solvent A3.

[0157] The sulfur solvent is prepared according to the sulfur solvent system of Example 1, and the specific process includes:

[0158] The fifth valve 111 is opened, the sulfur solvent A3 stored in the sulfur solvent storage tank 11 is added to the purification and separation unit by the power pump 12.

[0159] The sulfur-dissolving agent A3 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 2t, the sulfur-dissolving reaction time is 45min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0160] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 18min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 0.6t, wherein the content of the formation water is 85wt%, and the content of the industrial ethanol is 15wt%;

[0161] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized;

[0162] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, the recovery agent evaporates into a gaseous state after being heated, the gaseous recovery agent enters the condenser tube 52 to become a liquid state through condensation, enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced-pressure distillation unit 5.

[0163] Example 4

[0164] The sulfur-dissolving agent A4 is prepared:

[0165] 1 part by weight of diethanolamine and 0.12 parts by weight of dodecanol sodium sulfate are mixed, then 0.09 parts by weight of 18-crown-6 is added, and finally 0.09 parts by weight of monoalkyl phosphate is added to prepare 1t of the sulfur-dissolving agent A4;

[0166] The sulfur-dissolving reaction is performed according to the sulfur-dissolving system of Example 1, and the specific process includes:

[0167] The fifth valve 111 is opened, the sulfur-dissolving agent A4 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit through the power pump 12;

[0168] The sulfur-dissolving agent A4 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 2t, the sulfur-dissolving reaction time is 35min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0169] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 18min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 0.6t, wherein the content of the formation water is 85wt%, and the content of the industrial ethanol is 15wt%;

[0170] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized;

[0171] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, after heating, the recovery agent is evaporated into a gaseous state first, the gaseous recovery agent enters the condenser tube 52 to be condensed into a liquid state and enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced-pressure distillation unit 5.

[0172] Example 5

[0173] The sulfur-dissolving agent A5 is prepared:

[0174] 1 part by weight of triethanolamine and 0.15 parts by weight of sodium dodecanol sulfate are mixed, then 0.07 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether trisyl is added to configure 4t of the sulfur-dissolving agent A5;

[0175] The sulfur-dissolving system in Example 1 is used to perform a sulfur-dissolving reaction, and the specific process includes:

[0176] The fifth valve 111 is opened, the sulfur-dissolving agent A5 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit by the power pump 12;

[0177] The sulfur-dissolving agent A5 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 8 t, the sulfur-dissolving reaction time is 150 min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0178] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 30 min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 2 t, wherein the content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%;

[0179] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0180] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, the recovery agent evaporates into a gaseous state after being heated, the gaseous recovery agent enters the condenser tube 52 to become a liquid state through condensation, enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used to perform vacuumizing treatment on the reduced-pressure distillation unit 5.

[0181] Example 6

[0182] The sulfur-dissolving agent A6 is prepared:

[0183] 1 part by weight of triethanolamine and 0.15 parts by weight of sodium dodecanol sulfate are mixed, then 0.07 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether trisyl is added to configure 9 t of the sulfur-dissolving agent A6;

[0184] The sulfur-dissolving reaction is performed according to the sulfur-dissolving system in Example 1, and the specific process includes:

[0185] The fifth valve 111 is opened, the sulfur-dissolving agent A6 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit by the power pump 12;

[0186] The sulfur solvent A6 enters the injector 21, the sulfur solvent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur solvent enters the sulfur removal device 22 to perform a sulfur dissolving reaction with the elemental sulfur in the sulfur removal device 22, the weight of the elemental sulfur in the sulfur removal device 22 is estimated to be 16 t, the sulfur dissolving reaction time is 180 min, the second valve 224 is opened, a small amount of the sulfur dissolving reaction solution is taken, the color of the solution is reddish brown, which proves that the sulfur dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur removal device 22 is removed;

[0187] The first valve 223 is opened, the sulfur dissolving reaction solution enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur precipitation reaction with the sulfur dissolving reaction solution, and the elemental sulfur is precipitated, wherein the sulfur precipitation reaction time is 30 min, the recovery agent is a mixture of formation water and industrial ethanol, and the weight of the recovery agent is 3 t, wherein the content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%;

[0188] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized;

[0189] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur dissolving agent) enters the self-heating storage tank 51 for heating, because the boiling point of the recovery agent is lower than that of the sulfur dissolving agent, after heating, the recovery agent is evaporated into a gaseous state first, the gaseous recovery agent enters the condenser tube 52 to become a liquid state through condensation, enters the recovery agent recovery tank 53, the sulfur dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced pressure distillation unit 5.

[0190] Example 7

[0191] The sulfur dissolving agent A7 is prepared:

[0192] 1 part by weight of triethanolamine and 0.15 parts by weight of sodium dodecanol sulfate are mixed, then 0.07 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether trisyl is added to configure 10 t of the sulfur dissolving agent A7;

[0193] According to the sulfur dissolving system of example 1, the sulfur dissolving reaction is performed, and the difference is that the sulfur removal device 22 is a gas field gathering and transportation pipeline, and the specific process includes:

[0194] The fifth valve 111 is opened, the sulfur dissolving agent A7 stored in the sulfur dissolving agent storage tank 11 is added to the purification and separation unit by the power pump 12;

[0195] The sulfur-dissolving agent A7 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 20-25 t, the sulfur-dissolving reaction time is 180 min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0196] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 30 min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 3 t, wherein the content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%;

[0197] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized;

[0198] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, the recovery agent is evaporated into a gaseous state after heating, the gaseous recovery agent enters the condenser tube 52 to be condensed into a liquid state and enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used to perform vacuumizing treatment on the reduced-pressure distillation unit 5.

[0199] Example 8

[0200] The implementation is performed in the manner of example 7, and the difference is that the recovered sulfur-dissolving agent is refilled into the sulfur-dissolving system to repeat the above operation.

[0201] Example 9

[0202] The sulfur-dissolving agent A9 is prepared as follows:

[0203] 1 part by weight of triethanolamine and 0.15 parts by weight of sodium dodecanol sulfate are mixed, then 0.07 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether trisyl is added to configure 1.5 t of the sulfur-dissolving agent A9;

[0204] The sulfur-dissolving reaction is performed in the sulfur-dissolving system of example 1, and the difference is that the sulfur-removing device 22 is a wellhead pipeline-purification separator, and the specific process includes:

[0205] The fifth valve 111 is opened, and the sulfur solvent A9 stored in the sulfur solvent storage tank 11 is added to the purification separation unit by the power pump 12;

[0206] The sulfur solvent A9 enters the ejector 21, is atomized by the atomizing chamber 212 of the ejector 21, and enters the sulfur removal device 22 to perform a sulfur dissolution reaction with the elemental sulfur in the sulfur removal device 22. The weight of the elemental sulfur in the sulfur removal device 22 is estimated to be 2.5 t, and the sulfur dissolution reaction time is 40 min. A small amount of the solution after the sulfur dissolution reaction is taken out by opening the second valve 224, and the color of the solution is reddish brown, which proves that the sulfur dissolution reaction is sufficient, and the elemental sulfur remaining in the sulfur removal device 22 is removed.

[0207] The first valve 223 is opened, the solution after the sulfur dissolution reaction enters the recovery tank 31, and the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur precipitation reaction with the solution after the sulfur dissolution reaction. The sulfur precipitation reaction time is 15 min, and the recovery agent is a mixture of formation water and industrial ethanol, and the weight of the mixture is 0.2 t. The content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%.

[0208] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur solvent) after the reaction enter the filter tank 41 to realize solid-liquid separation by the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0209] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur solvent) enters the self-heating storage tank 51 for heating. Since the boiling point of the recovery agent is lower than that of the sulfur solvent, the recovery agent evaporates into a gaseous state after heating. The gaseous recovery agent enters the condenser tube 52, is condensed into a liquid state, enters the recovery agent recovery tank 53, and the sulfur solvent in the self-heating storage tank 51 is recovered. The vacuum pump 54 is used to perform vacuumizing treatment on the reduced pressure distillation unit 5.

[0210] Example 10

[0211] The sulfur dissolution reaction is performed according to the sulfur dissolution system of Example 1, and the difference is that the sulfur solvent A10 used is the sulfur solvent recovered in Example 1, and the weight of the sulfur solvent is 1.6 t. The specific process includes:

[0212] The fifth valve 111 is opened, and the sulfur solvent A10 stored in the sulfur solvent storage tank 11 is added to the purification separation unit by the power pump 12;

[0213] The sulfur-dissolving agent A10 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 2.3 t, the sulfur-dissolving reaction time is 60 min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0214] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 20 min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 0.2 t, wherein the content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%;

[0215] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0216] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur-dissolving agent, the recovery agent evaporates into a gaseous state after being heated, the gaseous recovery agent enters the condenser tube 52 to become a liquid state through condensation, enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used to perform vacuumizing treatment on the reduced-pressure distillation unit 5.

[0217] Example 11

[0218] The sulfur-dissolving reaction is performed according to the sulfur-dissolving system of Example 1, which is different from that, the sulfur-dissolving agent A11 used is the sulfur-dissolving agent (40 wt%) recovered in Example 1 and the sulfur-dissolving agent A1 (60 wt%) configured in Example 1, and the weight is 1.5 t, and the specific process includes:

[0219] The fifth valve 111 is opened, the sulfur-dissolving agent A11 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit by the power pump 12;

[0220] The sulfur-dissolving agent A11 enters the injector 21, the sulfur-dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur-dissolving agent enters the sulfur-removing device 22 to perform a sulfur-dissolving reaction with the elemental sulfur in the sulfur-removing device 22, the weight of the elemental sulfur in the sulfur-removing device 22 is estimated to be 3.5 t, the sulfur-dissolving reaction time is 40 min, the second valve 224 is opened, a small amount of the solution after the sulfur-dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur-dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur-removing device 22 is removed;

[0221] The first valve 223 is opened, the solution after the sulfur-dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur-precipitating reaction with the solution after the sulfur-dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur-precipitating reaction time is 20 min, the recovery agent is a mixture of the formation water and the industrial ethanol, and the weight of the recovery agent is 0.2 t, wherein the content of the formation water is 80 wt%, and the content of the industrial ethanol is 20 wt%;

[0222] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur-dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0223] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur-dissolving agent) enters the self-heating storage tank 51 to be heated, the recovery agent is evaporated into a gaseous state after heating due to the lower boiling point of the recovery agent than that of the sulfur-dissolving agent, the gaseous recovery agent enters the condenser tube 52 to be condensed into a liquid state and enters the recovery agent recovery tank 53, the sulfur-dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used for vacuumizing the reduced-pressure distillation unit 5.

[0224] Example 12

[0225] The example is implemented in the manner of example 1, and the difference is that the sulfur-dissolving reaction time is 5 min.

[0226] Example 13

[0227] The sulfur-dissolving agent A13 is prepared as follows:

[0228] 1 part by weight of triethanolamine and 0.8 parts by weight of sodium dodecanol sulfate are mixed, then 0.04 parts by weight of 15-crown-5 is added, and finally 0.08 parts by weight of alcohol ether trisyl is added to prepare 1 t of the sulfur-dissolving agent A13;

[0229] The sulfur-dissolving reaction is performed on the sulfur-dissolving system of example 1, and the specific process includes:

[0230] The fifth valve 111 is opened, the sulfur-dissolving agent A13 stored in the sulfur-dissolving agent storage tank 11 is added to the purification and separation unit through the power pump 12.

[0231] The sulfur dissolving agent A13 enters the injector 21, the sulfur dissolving agent is atomized by the atomizing chamber 212 of the injector 21, and the atomized sulfur dissolving agent enters the sulfur removing device 22 to perform a sulfur dissolving reaction with the elemental sulfur in the sulfur removing device 22, the weight of the elemental sulfur in the sulfur removing device 22 is estimated to be 2t, the sulfur dissolving reaction time is 40min, the second valve 224 is opened, a small amount of the solution after the sulfur dissolving reaction is taken, the color of the solution is reddish brown, which proves that the sulfur dissolving reaction is sufficient, and the residual elemental sulfur in the sulfur removing device 22 is removed;

[0232] The first valve 223 is opened, the solution after the sulfur dissolving reaction enters the recovery tank 31, the third valve 312 is opened, the recovery agent enters the recovery tank 31 through the recovery agent inlet 311 to perform a sulfur precipitation reaction with the solution after the sulfur dissolving reaction, and the elemental sulfur is precipitated, wherein the sulfur precipitation reaction time is 20min, the recovery agent is a mixture of formation water and industrial ethanol, and the weight of the recovery agent is 0.2t, wherein the content of the formation water is 80wt%, and the content of the industrial ethanol is 20wt%.

[0233] The first check valve 313 is opened, the elemental sulfur and the mixed solution (the recovery agent and the sulfur dissolving agent) after the reaction enter the filter tank 41 to realize solid-liquid separation through the filter screen, the elemental sulfur is stored on the filter screen, and the elemental sulfur recovery is realized.

[0234] The second check valve 411 is opened, the mixed solution (the recovery agent and the sulfur dissolving agent) enters the self-heating storage tank 51 to be heated, because the boiling point of the recovery agent is lower than that of the sulfur dissolving agent, after heating, the recovery agent is evaporated into a gaseous state first, the gaseous recovery agent enters the condenser tube 52 to be condensed into a liquid state and enters the recovery agent recovery tank 53, the sulfur dissolving agent in the self-heating storage tank 51 is recovered, and the vacuum pump 54 is used to perform vacuumizing treatment on the reduced pressure distillation unit 5.

[0235] Comparative Example 1

[0236] The artificial sulfur removal method is used in the comparative example:

[0237] The connection between the purification separator and the front and rear devices is disconnected, the gas is replaced, the workers enter the purification separator to perform artificial mechanical sulfur removal, the sulfur is removed by using a shovel, and the sulfur is transported out.

[0238] Comparative Example 2

[0239] The implementation is performed in the manner of the example 1, and the difference is that the filling amount of the recovery agent is 2t, and the sulfur precipitation reaction time is 3min.

[0240] Test Example

[0241] The recovered sulfur of the above examples and comparative examples was weighed, and the time of the whole sulfur dissolving process was calculated, the sulfur blocking amount was calculated by the recovery rate of the recovery agent, and the calculation results are shown in Table 1.

[0242] Table 1

[0243]

[0244]

[0245] It can be seen from the results in Table 1 that the sulfur dissolving agent and the sulfur dissolving system of the present application are used for the sulfur dissolving reaction of the sulfur removal device in the sulfur-containing gas field exploitation, the sulfur removal efficiency is high, the time is short, and the sulfur removal device does not need to be stopped for production, which is simple, convenient and efficient.

[0246] The preferred embodiments of the present application are described in detail above, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as the disclosed content of the present application, and all belong to the protection scope of the present application.

Claims

1. A sulfur dissolving agent, characterized in that: The sulfur dissolving agent comprises a C2-C10 alcohol amine, a catalyst, and a dispersant; Wherein, the catalyst is a quaternary ammonium salt and / or a crown ether, and the dispersant is an anionic dispersant and / or a water-soluble polymer compound.

2. The sulfur dissolving agent according to claim 1, characterized in that The weight ratio of the C2-C10 alcohol amine, catalyst and dispersant is 1:0.05-0.1:0.1-0.2; Preferably, the weight ratio of the C2-C10 alcohol amine, catalyst and dispersant is 1:0.07-0.08:0.12-0.

16.

3. The sulfur dissolving agent according to claim 1 or 2, characterized in that The C2-C10 alcohol amine is selected from one or more of ethanolamine, diethanolamine, triethanolamine and diethylethanolamine.

4. The sulfur dissolving agent according to claim 1, characterized in that The quaternary ammonium salt is selected from one or more of tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate and tetradecyltrimethylammonium chloride; Preferably, the crown ether is 18-crown-6 and / or 15-crown-5.

5. The sulfur dissolving agent according to claim 1, characterized in that The dispersant is selected from one or more of sodium lauryl sulfate, sodium alcohol ether carboxylate and sodium polyacrylate.

6. The sulfur dissolving agent according to claim 1, characterized in that The sulfur dissolving agent further comprises a surfactant, and the weight ratio of the C2-C10 alcohol amine to the surfactant is 1:0.05-1; Preferably, the weight ratio of the C2-C10 alcohol amine to the surfactant is 1:0.06-0.

09.

7. The sulfur dissolving agent according to claim 6, characterized in that The surfactant is selected from one or more of amphoteric surfactants, nonionic surfactants and anionic surfactants.

8. Use of the sulfur dissolving agent according to any one of claims 1 to 7 in the exploitation of sulfur-containing gas fields.

9. A method for dissolving sulfur, characterized in that: The method comprises: transporting the sulfur dissolving agent according to any one of claims 1 to 7 to a desulfurizer to be used in the exploitation of a sulfur-containing gas field, contacting the sulfur dissolving agent with sulfur in the desulfurizer to carry out a sulfur dissolving reaction, and then mixing the sulfur-dissolved solution with a recovery agent for recovery; Wherein, the recovery agent is a mixture of alcohol and water.

10. The method according to claim 9, characterized in that The ratio of the weight of the sulfur dissolving agent to the weight of elemental sulfur is 5-6:

10.

11. The method according to claim 9, characterized in that The weight ratio of the sulfur dissolving agent to the recovery agent is 1-5:1; Preferably, the sulfur dissolution reaction time is 20-180 minutes.

12. The method according to claim 9, characterized in that The content of alcohol in the recovery agent is 5-20wt%.

13. The method according to any one of claims 9 to 12, characterized in that: The sulfur dissolving method according to claim 9 is carried out in a sulfur dissolving system; Wherein, the sulfur dissolving system includes a purification and separation unit; The purification and separation unit includes an ejector (21) and a desulfurizer (22); The injector (21) has a sulfur dissolving agent inlet (211) and an atomization chamber (212); The sulfur-dissolving agent outlet of the ejector (21) is connected to the sulfur-dissolving agent inlet of the desulfurizer (22).

14. The method according to claim 13, characterized in that The desulfurizer (22) further has a solution observation port (222).

15. The method according to claim 13, characterized in that The sulfur dissolving system further comprises a recovery unit connected to the purification and separation unit.

16. The method according to claim 15, characterized in that The recovery unit comprises a recovery tank (31), wherein the recovery tank (31) has a recovery agent inlet (311); The solution outlet (221) of the desulfurizer (22) is connected to the solution inlet of the recovery tank (31).

17. The method according to claim 15, characterized in that The sulfur dissolving system further comprises a filtering unit connected to the recovery unit.

18. The method according to claim 17, characterized in that The filtration unit comprises a filtration tank (41), and the solid-liquid outlet of the recovery tank (31) is connected to the solid-liquid inlet of the filtration tank (41).

19. The method according to claim 17, wherein The sulfur dissolving system further comprises a vacuum distillation unit (5) connected to the filtration unit.

20. The method according to claim 19, wherein The vacuum distillation unit (5) includes a self-heating storage tank (51), a condenser (52), a recovery agent recovery tank (53) and a vacuum pump (54); The recovery agent outlet of the storage tank (51) is connected to the recovery agent inlet of the condenser (52), the recovery agent outlet of the condenser (52) is connected to the recovery agent inlet of the recovery agent recovery tank (53), and the recovery agent recovery tank (53) is connected to the vacuum pump (54); The mixed solution outlet of the filter tank (41) is connected to the input end of the vacuum distillation unit (5).

21. The method according to claim 20, characterized in that The sulfur dissolving system further comprises a sulfur dissolving agent storage unit connected to the purification and separation unit.

22. The method according to claim 21, characterized in that The sulfur dissolving agent storage unit comprises a sulfur dissolving agent storage tank (11) and a power pump (12) connected in sequence; The power pump (12) is connected to the sulfur dissolving agent inlet (211) of the ejector (21).

Images