Nonionic-anionic water-reducing agents, their preparation and use

Abstract

The application discloses a non-ion-anion water-reducing agent and preparation and application thereof. The water-reducing agent is shown as formula (1).

Description

Technical Field

[0001] This invention relates to a nonionic-anionic water purification agent and its preparation and application. Background Technology

[0002] Oily wastewater from oilfields is a major source of environmental pollution. Many oilfields in my country have entered the mid-to-late stages of extraction, with extracted crude oil containing 80%–90% water. Polymer flooding is increasingly widely used, leading to a significant increase in oily wastewater. This wastewater originates from crude oil dehydration stations. Because the wastewater comes from different formations and is generated during various processes, its composition is highly complex, including oil, suspended solids, chemicals, and polymers used for oil displacement. The primary treatment method for oilfield wastewater is reinjection. If untreated wastewater is directly injected into the formation, incompatibility between the wastewater and the injection layer will lead to more sedimentation, clogging formation fractures, reducing the efficiency of water injection underground, and shortening the service life of injection wells.

[0003] Although many domestic oilfields have continuously improved their extraction processes and developed new wastewater treatment technologies in recent years, the ever-increasing wastewater production cannot wait for the development of new processes and technologies. Currently, many domestic oilfields still treat wastewater using chemical and physical methods. In actual production, these two methods are often used in combination. Physical methods do not cause secondary pollution to the environment, but treating wastewater using only physical methods is time-consuming, requires a large space, and is difficult to achieve wastewater treatment standards within a limited time. Chemical methods mainly involve injecting chemical agents into wastewater pipes or wastewater treatment equipment. Because the water quality and treatment equipment vary from oilfield to oilfield, the added water-cleaning agents and other chemical agents differ. By adding water-cleaning agents, reverse demulsification and flocculation are achieved, resulting in water purification. Chemical methods for wastewater treatment are more flexible; the formulation and dosage of the agents can be adjusted according to the volume of wastewater and the complexity of the water quality. Generally, oilfields use a combination of physical and chemical methods to treat wastewater. By combining these two methods, large quantities of oilfield wastewater can be treated quickly.

[0004] Due to the long history of crude oil extraction in my country, the development technology of oilfield injection agents is quite mature. However, the problem of treating oily wastewater, which is difficult to handle due to constantly changing water quality, has not been well resolved. Currently, cationic water treatment agents are the main type used in oilfields, but nonionic water treatment agents are gradually being applied, especially in offshore oilfield wastewater treatment. Cationic water treatment agents have certain limitations, so the synthesis of nonionic-anionic water treatment agents is of great significance for oilfield wastewater treatment. Summary of the Invention

[0005] This invention was developed to improve water treatment. The nonionic-anionic water purification agent provided in this invention has the characteristics of strong adaptability, good stability, significant treatment effect, and high efficiency. It can greatly improve the wastewater treatment efficiency of oil fields, especially offshore oil fields. It is safe and environmentally friendly, simple to prepare, easy to configure, fast and efficient, and low in cost.

[0006] As one aspect of the present invention, a nonionic-anionic water purification agent is provided, as shown in formula (1).

[0007]

[0008] in:

[0009]

[0010] As another aspect of the present invention, a method for preparing the above-mentioned nonionic-anionic water purification agent is provided, comprising:

[0011] (1) Formaldehyde solution and xylene were added dropwise to a mixed solution of p-tert-butylphenol and polyethylene polyamine, the solution was refluxed to remove water, and the xylene was evaporated at about 150°C to obtain the initiator.

[0012] (2) The initiator and catalyst are put into a sealed reactor and ethylene oxide is introduced to react and obtain intermediate product 1.

[0013] (3) The intermediate product 1 and the catalyst are put into a reaction vessel and sealed. Propylene oxide is introduced to obtain intermediate product 2.

[0014] (4) The intermediate product 2 and the catalyst are put into a sealed reactor, and ethylene oxide is introduced to react and obtain polyether A.

[0015] (5) The polyether A is dissolved in 70% methanol solution, potassium hydroxide solution is added, sodium chloroacetate solution is added dropwise, and the reaction is carried out to obtain the polyether water-removing agent.

[0016] In at least one specific embodiment, in step (1), the polyethylene polyamine is a co-product of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

[0017] In at least one specific embodiment, in step (1), the mass ratio of p-tert-butylphenol, the polyethylene polyamine, and the formaldehyde is 1:2.52:0.4.

[0018] In at least one specific embodiment, in step (1), the amount of xylene used is the sum of the masses of p-tert-butylphenol, polyethylene polyamine, and formaldehyde solution.

[0019] In at least one specific embodiment, in step (1), the temperature of the reflux dehydration is 110°C and the time is 2 hours.

[0020] In at least one specific embodiment, the mass ratio of the initiator added in step (2), the ethylene oxide added in step (2), the propylene oxide added in step (3), and the ethylene oxide added in step (4) is 1:(69-359):(138-718):(46-239).

[0021] In at least one specific embodiment, the mass ratio of ethylene oxide added in step (2) to propylene oxide added in step (3) is 1:2, and the mass ratio of propylene oxide added in step (3) to ethylene oxide added in step (4) is 3:1.

[0022] In at least one specific embodiment, in steps (2), (3), and (4), the reaction temperature of the initiator with the ethylene oxide added in step (2) is 110–125°C; the reaction temperature of the intermediate product 1 with the propylene oxide added in step (3) is 135–145°C; and the reaction temperature of the intermediate product 2 with the ethylene oxide added in step (4) is 110–125°C.

[0023] In at least one specific embodiment, in steps (2), (3), and (4), the catalyst is potassium hydroxide.

[0024] In at least one specific embodiment, the catalyst used in step (2) is 0.3% to 0.7% of the total mass of the initiator and the ethylene oxide; the catalysts used in step (3) and step (4) are both 0.15% to 0.35% of the total mass of the initiator, the ethylene oxide and the propylene oxide.

[0025] In at least one specific embodiment, the catalyst used in step (2) is 0.4% of the total mass of the initiator and the ethylene oxide; the catalyst used in step (3) and step (4) is 0.2% of the total mass of the initiator, the ethylene oxide and the propylene oxide.

[0026] In at least one specific embodiment, in steps (2), (3), and (4), nitrogen is required to replace the gas inside the reactor.

[0027] In at least one specific embodiment, in step (5), the mass of potassium hydroxide added is 2% of the mass of the polyether A.

[0028] In at least one specific embodiment, in step (5), the amount of sodium chloroacetate used is 1.5% to 2.5% of the polyether A.

[0029] Specifically, the methods for preparing the above-mentioned nonionic-anionic water purification agents include:

[0030] (1) Stir p-tert-butylphenol and polyethylene polyamine and heat to 35°C. Slowly add 40% formaldehyde solution and keep warm for 35-45 minutes. Add xylene and heat to 100°C to start reflux dehydration. Keep the temperature at 100-110°C. After 2 hours, when the water is completely removed, gradually raise the temperature to 150°C. At this time, the transparency of the solution gradually increases. Xylene begins to evaporate at 150°C. Keep the temperature at 150-195°C. After 1 hour, the xylene is completely removed. Continue to keep the temperature at 150°C for 1 hour. After the reaction is completed, cool down to 120°C and discharge the material to obtain the initiator.

[0031] (2) The initiator and catalyst are put into the reactor and sealed. The air in the reactor is replaced by nitrogen purging and the reactor is evacuated to a vacuum. The feed valve is opened and the designed amount of ethylene oxide (EO) is slowly introduced. The pressure gauge reading is controlled between 0.19 and 0.21 MPa. After the ethylene oxide is added, the feed valve is closed. When the pressure gauge reading of the reactor decreases to negative pressure, the reaction ends. The reactor is cooled down and discharged to obtain intermediate product 1.

[0032] (3) Add intermediate product 1 and catalyst into the reactor and seal it. Use nitrogen to purge the air in the reactor and draw it to a vacuum. Open the feed valve and slowly introduce the designed amount of propylene oxide (PO). Control the pressure gauge reading between 0.19 and 0.21 MPa. After the propylene oxide is added, close the feed valve. When the pressure gauge reading in the reactor decreases to negative pressure, the reaction ends and intermediate product 2 is obtained.

[0033] (4) Add intermediate product 2 and catalyst into the reactor and seal it. Use nitrogen to purge the air in the reactor and draw it to a vacuum. Open the feed valve and slowly introduce the designed amount of ethylene oxide. Control the pressure gauge reading between 0.19 and 0.21 MPa. After the ethylene oxide is added, close the feed valve. When the pressure gauge reading in the reactor decreases to negative pressure, the reaction ends and polyether A is obtained.

[0034] (5) Dissolve polyether A in 70% methanol solution, stir and heat to 50-60°C, add potassium hydroxide solution, stir for 20 min, then heat to 60-80°C, slowly add 30% sodium chloroacetate solution, control the addition time to about 2-3 h, until the 30% sodium chloroacetate solution is completely added, keep the temperature at 60-80°C, react for 8 h, and obtain polyether water-soluble agent.

[0035] As another aspect of the present invention, it relates to the application of the above-mentioned nonionic-anionic water purification agent in water treatment.

[0036] As another aspect of the present invention, a water treatment method is provided, using the aforementioned nonionic-anionic water purification agent. Detailed Implementation

[0037] The purpose of this invention is to provide a nonionic-anionic water purification agent, which has the characteristics of strong adaptability, good stability, obvious treatment effect and high efficiency, and can greatly improve the wastewater treatment efficiency of oil fields, especially offshore oil fields.

[0038] The preparation method of the nonionic-anionic water purification agent of the present invention generally includes the following steps:

[0039] (1) The initiator was synthesized by p-tert-butylphenol + polyethylene polyamine + formaldehyde;

[0040]

[0041] (2) The initiator was reacted with ethylene oxide, propylene oxide, and ethylene oxide to synthesize polyether A.

[0042]

[0043] in:

[0044]

[0045] (3) Polyether A reacts with sodium chloroacetate to synthesize a nonionic-anionic water purification agent.

[0046]

[0047] in:

[0048]

[0049] The nonionic-anionic water treatment agent described in this invention has the following advantages compared with conventional surfactants or other polyether water treatment agents in the prior art: It features strong adaptability, good stability, significant treatment effect, and high efficiency, which can greatly improve the wastewater treatment efficiency of oil fields, especially offshore oil fields. It is safe and environmentally friendly, with a simple preparation method, convenient formulation, rapid and efficient operation, and low cost. Furthermore, this nonionic-anionic water treatment agent belongs to a multi-branched polyether, possessing high stability and high surface activity, making it a promising candidate for research in the field of oilfield wastewater treatment.

[0050] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Where specific conditions are not specified in the examples, they are performed under conventional conditions or conditions recommended by the manufacturer. Reagents, instruments, or methods used in the embodiments of the present invention whose source is not specified are all conventional products that can be obtained commercially or from the applicant.

[0051] In this invention, when the solution is added in units of mass, the mass refers to the total mass of the solution.

[0052] In this invention, unless otherwise specified, the parts of the added reactants are parts by mass.

[0053] Reagents used in this invention:

[0054] Polyethylene polyamine, purchased from Aladdin Chemical Reagents website, has the molecular formula C2nH5nNn, a molecular weight of Typical 275, and CAS number 68131-73-7. It is a co-product of ethylenediamine, diethylenetriamine, triethylenetetramine, and tetraethylenepentamine.

[0055] tert-Butylphenol: Brand name Aladdin, molecular formula C 10 H 14 O, with a molecular weight of 150.22 and a purity of 99%.

[0056] Formaldehyde aqueous solution: brand is Hushi, molecular formula CH2O, purity 37.0-40.0%.

[0057] Sodium chloroacetate: Brand: Aladdin, Specification or Purity: AR, 98.0%.

[0058] Xylene: Brand: Aladdin, Specification or Purity: AR, 99%.

[0059] Example 1

[0060] Take 20 parts of p-tert-butylphenol and 50.4 parts of polyethylene polyamine and add them to a four-necked flask. Stir and heat to 35°C in a water bath for 15 minutes. Then slowly add 20 parts of 40% formaldehyde solution. After the addition is complete, keep the reaction temperature for 35 minutes. Add 45.2 parts of xylene and heat to 100°C to start reflux dehydration. Maintain the temperature at 100-110°C. After 2 hours, when the water has been completely removed, gradually raise the temperature to 150°C. At this time, the transparency of the solution gradually increases. Xylene begins to evaporate at 150°C. Maintain the temperature at 150-195°C. After 1 hour, the xylene is completely removed. Continue to maintain the temperature at 150°C for 1 hour. After the reaction is completed, cool down to 120°C and discharge the product to obtain initiator I (I represents the first letter of the English word for initiator).

[0061] Add 1 part of initiator I and 0.28 parts (the mass of the catalyst is 0.4% of the mixed mass of initiator I and ethylene oxide) of potassium hydroxide to the reactor and seal the reactor. Purge the reactor with nitrogen to replace the air, then evacuate it with a vacuum pump. After 5 minutes, start heating. When the temperature reaches 110°C, stop heating, open the feed valve, and introduce 69 parts of ethylene oxide. Control the pressure gauge reading within 0.2 ± 0.01 MPa, and keep the temperature constant. After the feed is completed, continue the reaction for 40 minutes. When the pressure in the reactor drops to a negative pressure, the reaction is considered complete. Finally, cool down the reactor, open it, and discharge the intermediate product IE. 69 -1. (E represents grafted ethylene oxide (EO))

[0062] Take 1 part of the intermediate product IE synthesized from the initiator 69 All of the above-mentioned amounts of potassium hydroxide and 0.416 parts (the mass of the catalyst is the mass of the initiator I taken in the previous step, and 0.2% of the mixed mass of the ethylene oxide and the designed propylene oxide added in the above step) were added to the reactor, and the reactor was sealed. The air was purged with nitrogen, and then a vacuum pump was used to evacuate the system. Heating was started after 5 minutes, and when the temperature reached 135°C, heating was stopped. The feed valve was opened, and 138 parts of propylene oxide were introduced. The pressure gauge reading was controlled within 0.2 ± 0.01 MPa, and the temperature remained constant. After the feed was completed, the reaction continued for 40 minutes. When the pressure in the reactor dropped to a negative pressure, the reaction was considered complete. Finally, the reactor was cooled and opened, and the intermediate product IE was discharged. 69 P 138 -1. (P represents grafted propylene oxide (PO))

[0063] Take the intermediate product IE after the reaction 69 P 138 -1 and 0.508 parts (the mass of the catalyst is 0.2% of the mass of the initiator I taken in the above steps, the ethylene oxide, propylene oxide and the designed ethylene oxide mixture added in the above steps) of potassium hydroxide were added to the reactor, and the reactor was sealed. The air was purged with nitrogen, and then a vacuum pump was used to evacuate the system. Heating was started after 5 minutes, and when the temperature reached 110°C, heating was stopped. The feed valve was opened, and 46 parts of ethylene oxide were introduced. The pressure gauge reading was controlled within 0.2±0.01 MPa, and the temperature remained constant. After the feed was completed, the reaction continued for 40 minutes. When the pressure in the reactor dropped to negative pressure, the reaction was considered complete. Finally, the reactor was cooled and opened, and the polyether IE was discharged. 69 P 138 E 46 -1.

[0064] Take 100 parts of polyether IE 69 P 138 E 46-1 was added to a four-necked flask, using 70% methanol solution as solvent. The mixture was stirred and heated in a water bath to 55°C. Ten parts of 20% potassium hydroxide solution (2% of the mass of IEPE-1 catalyst) were added and stirred for 20 minutes. The temperature was raised to 70°C, and 66.67 parts of 30% sodium chloroacetate solution (2% of the mass of polyether IEPE-1) were slowly added dropwise over approximately 2.5 hours. After the addition was complete, the temperature was maintained at 70°C for 8 hours. The reaction was then stopped, cooled, and the product was discharged to obtain modified nonionic-anionic water-purifying agent sample 1 (IEPE-1). 69 P 138 E 46 -M1).

[0065] Example 2

[0066] Take 20 parts of p-tert-butylphenol and 50.4 parts of polyethylene polyamine and add them to a four-necked flask. Stir and heat to 35°C in a water bath for 15 minutes. Then slowly add 20 parts of 40% formaldehyde solution. After the addition is complete, keep the reaction temperature for 35 minutes. Add 45.2 parts of xylene and heat to 100°C to start reflux dehydration. Maintain the temperature at 100-110°C. After 2 hours, when the water has been completely removed, gradually raise the temperature to 150°C. At this time, the transparency of the solution gradually increases. Xylene begins to evaporate at 150°C. Maintain the temperature at 150-195°C. After 1 hour, the xylene is completely removed. Continue to maintain the temperature at 150°C for 1 hour. After the reaction is completed, cool down to 120°C and discharge the product to obtain initiator I.

[0067] Add 1 part of initiator I and 0.4 parts of potassium hydroxide (the mass of the catalyst is 0.4% of the mixed mass of initiator I and ethylene oxide) to the reactor and seal the reactor. Purge the reactor with nitrogen to replace the air, then evacuate it with a vacuum pump. After 5 minutes, start heating. When the temperature reaches 110°C, stop heating, open the feed valve, and introduce 99 parts of ethylene oxide. Control the pressure gauge reading within 0.2 ± 0.01 MPa, and keep the temperature constant. After the feed is completed, continue the reaction for 40 minutes. When the pressure in the reactor drops to a negative pressure, the reaction is considered complete. Finally, cool down the reactor, open it, and discharge the product to obtain IE. 99 -2.

[0068] Take the intermediate product IE after the reaction 99-2 and 0.596 parts of potassium hydroxide (the mass of the catalyst is the mass of the initiator I taken in the previous step, and 0.2% of the mixed mass of the ethylene oxide and the designed propylene oxide added in the above step) were added to the reactor, and the reactor was sealed. The air was purged with nitrogen, and then a vacuum pump was used to evacuate the system. Heating was started after 5 minutes, and when the temperature reached 135°C, heating was stopped. The feed valve was opened, and 198 parts of propylene oxide were introduced. The pressure gauge reading was controlled within 0.2 ± 0.01 MPa, and the temperature remained constant. After the feed was completed, the reaction continued for 40 minutes. When the pressure in the reactor dropped to a negative pressure, the reaction was considered complete. Finally, the reactor was cooled and opened, and the intermediate product IE was discharged. 99 P 198 -2.

[0069] Take the intermediate product IE after the reaction 99 P 198 -2 and 0.728 parts of potassium hydroxide (the mass of the catalyst is 0.2% of the mass of initiator I in the above steps, the mass of the ethylene oxide, propylene oxide and designed ethylene oxide mixture added in the above steps) were added to the reactor, and the reactor was sealed. The air was purged with nitrogen, and then a vacuum pump was used to evacuate the system. Heating was started after 5 minutes, and heating was stopped when the temperature reached 110°C. The feed valve was opened, and 66 parts of ethylene oxide were introduced. The pressure gauge reading was controlled within 0.2±0.01MPa, and the temperature remained constant. After the feed was completed, the reaction continued for 40 minutes. The reaction was considered complete when the pressure in the reactor dropped to negative pressure. Finally, the reactor was cooled and opened, and the polyether IE was discharged. 99 P 189 E 66 -2.

[0070] Take 100 parts of polyether IE 99 P 189 E 66 -2 was added to a four-necked flask, using 70% methanol solution as the solvent, stirred, and heated in a water bath to 55°C. Then, 10 parts of 20% potassium hydroxide solution were added (the mass of the catalyst was IE). 99 P 189 E 66 -2% by mass) and stir for 20 minutes, raise the temperature to 70°C and slowly add 66 parts of 30% sodium chloroacetate solution (sodium chloroacetate mass is IE). 99 P 189 E 66 -2% by mass), added dropwise over approximately 2.5 hours, followed by heat preservation for 8 hours, to obtain modified nonionic-anionic water purification agent sample 1 (IE). 99 P 189 E 66 -M2).

[0071] Example 3

[0072] 1. The synthesis steps of the initiator are completely consistent with those described in Example 1.

[0073] 2. Different proportions of water-refining agent samples were obtained by grafting different ethylene oxides in step 2. Once the mass of the grafted ethylene oxide in step 2 was determined, the masses of the first grafted PO and the second grafted EO were fixed according to the fixed ratio conditions in steps 3 and 4 (first grafted EO: first grafted PO = 1:2; first grafted PO: second grafted EO = 3:1). (Except for the IE described in Examples 1 and 2 above...) 69 P 138 E 46 -M1 and IE 99 P 189 E 66 In addition to M2, the mass of the first grafted EO was set to 159, 199, 259, and 359 units respectively to obtain IE. 159 P 318 E 106 -M3, IE 199 P 398 E 132 - M4, IE 259 P 518 E 172 -M5, IE 359 P 718 E 239 -M6. The default value for the initiator in all the above samples is 1 part. See Table 1 for details.

[0074] Table 1

[0075]

[0076] Note: M in the table above I :M EO-1 M is the mass ratio of the initiator to the first grafted ethylene oxide; EO-1 :M PO M represents the mass ratio of the first grafted ethylene oxide to the first grafted propylene oxide; PO :M EO-2 The mass ratio of the first grafted ethylene oxide to the second grafted propylene oxide.

[0077] 3. Since the mass of the added catalyst varies with the mass of grafted ethylene oxide and propylene oxide, the amount of catalyst added during the synthesis process of each sample was obtained according to the proportion of grafted alkylene oxide in each sample in Table 1, as shown in Table 2.

[0078] Table 2

[0079]

[0080] Note: The catalyst is potassium hydroxide; the amount of catalyst added is based on 1 part of the initiator; the amount of catalyst used for the first EO grafting is 0.3% to 0.7% of the total mass of the initiator and ethylene oxide, specifically 0.4%. The amount of catalyst used for the first PO grafting and the second EO grafting is 0.15% to 0.35% of the total mass of the initiator, ethylene oxide, and propylene oxide, specifically 0.2%.

[0081] Example 4: Evaluation of the modified water purification agent

[0082] The wastewater treatment effects of different modified water purification agents were evaluated, with wastewater from Liaohe Oilfield as the treatment target. The experimental results are shown in Table 3 below.

[0083] Table 3

[0084]

[0085] It can be observed that the synthesized modified water purifier has excellent effects, and the water color gradually becomes clearer with increasing treatment time. At 5 minutes, the water color is turbid in all samples, with suspended solids in samples 1, 2, 4, and 5 floating to the surface, while suspended solids in samples 3 and 6 are freely dispersed in the wastewater. At 15 minutes, the water color of samples 4 and 5 begins to clear, with suspended solids at the bottom of the test tubes reaching a settling height of 1 cm and 0.8 cm, respectively. Other samples are relatively turbid, but suspended solids of varying heights also appear at the bottom of the test tubes. At 30 minutes, the sedimentation effect of each sample reaches its optimal level, and the water color becomes slightly clearer, with suspended solids at the bottom of the test tubes all above 1.2 cm, and the settling height of samples 1, 3, 5, and 6 all reaching 1.5 cm. In summary, sample 1 (IE 69 P 138 E 46 -M1) Sample 3 (IE 159 P 318 E 106 -M3), Sample 5 (IE) 259 P 518 E 172 -M5) and sample 6 (IE 359 P 718 E 239 -M6) performed better. The order from best to worst is: Sample 5, Sample 6, Sample 1, Sample 3, Sample 4, Sample 2.

[0086] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A nonionic-anionic water purification agent, characterized in that, As shown in equation (1), （1）， in: ； x, y, m, n, and p represent the number of repeating units.

2. A method for preparing the nonionic-anionic water purification agent according to claim 1, characterized in that, include: (1) Formaldehyde solution and xylene were added dropwise to a mixed solution of p-tert-butylphenol and polyethylene polyamine, the mixture was refluxed to remove water, and the xylene was evaporated at 150℃~195℃ to obtain the initiator, which is shown below: ； (2) The initiator and catalyst are put into a sealed reactor and ethylene oxide is introduced to react and obtain intermediate product 1; (3) The intermediate product 1 and the catalyst are put into a reaction vessel and sealed. Propylene oxide is then introduced to obtain intermediate product 2. (4) The intermediate product 2 and the catalyst are put into a sealed reactor, and ethylene oxide is introduced to react and obtain polyether A, which is shown below: ； in: ； (5) The polyether A is dissolved in 70% methanol solution, potassium hydroxide solution is added, sodium chloroacetate solution is added dropwise, and the reaction is carried out to obtain the polyether water-removing agent.

3. The method according to claim 2, characterized in that: In step (1), the polyethylene polyamine is a co-product of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

4. The method according to claim 2, characterized in that: In step (1), the mass ratio of p-tert-butylphenol, polyethylene polyamine, and formaldehyde is 1:2.52:0.

4.

5. The method according to claim 2, characterized in that: In step (1), the amount of xylene used is the sum of the masses of p-tert-butylphenol, polyethylene polyamine, and formaldehyde solution.

6. The method according to claim 2, characterized in that: In step (1), the temperature of reflux dehydration is 100~110℃ and the time is 2h.

7. The method according to claim 2, characterized in that: The mass ratio of the initiator added in step (2), the ethylene oxide added in step (2), the propylene oxide added in step (3), and the ethylene oxide added in step (4) is 1:(69~359):(138~718):(46~239).

8. The method according to claim 7, characterized in that: The mass ratio of ethylene oxide added in step (2) to propylene oxide added in step (3) is 1:2, and the mass ratio of propylene oxide added in step (3) to ethylene oxide added in step (4) is 3:

1.

9. The method according to any one of claims 2 to 8, characterized in that: In steps (2), (3), and (4), the reaction temperature between the initiator and the ethylene oxide added in step (2) is 110~125℃; the reaction temperature between intermediate product 1 and the propylene oxide added in step (3) is 135~145℃; and the reaction temperature between intermediate product 2 and the ethylene oxide added in step (4) is 110~125℃.

10. The method according to any one of claims 2 to 8, characterized in that: In steps (2), (3), and (4), the catalyst is potassium hydroxide.

11. The method according to claim 10, characterized in that: The catalyst used in step (2) is 0.3% to 0.7% of the total mass of the initiator and the ethylene oxide; the catalyst used in step (3) is 0.15% to 0.35% of the total mass of the initiator, the ethylene oxide and the propylene oxide; the catalyst used in step (4) is 0.15% to 0.35% of the total mass of the initiator, the ethylene oxide and the propylene oxide.

12. The method according to claim 11, characterized in that: The catalyst used in step (2) is 0.4% of the total mass of the initiator and the ethylene oxide; the catalyst used in step (3) is 0.2% of the total mass of the initiator, the ethylene oxide and the propylene oxide; the catalyst used in step (4) is 0.2% of the total mass of the initiator, the ethylene oxide and the propylene oxide.

13. The method according to claim 2, characterized in that: In steps (2), (3), and (4), nitrogen is required to replace the gas inside the reactor.

14. The method according to claim 2, characterized in that: In step (5), the mass of potassium hydroxide added is 2% of the mass of polyether A.

15. The method according to claim 2, characterized in that: In step (5), the amount of sodium chloroacetate used is 1.5% to 2.5% of the polyether A.

16. The method according to any one of claims 2-8 and 11-15, characterized in that: include: (1) Stir p-tert-butylphenol and polyethylene polyamine and heat to 35°C. Slowly add 40% formaldehyde solution and keep warm for 35-45 minutes. Add xylene and heat to 100°C to start reflux dehydration. Keep the temperature at 100-110°C. After 2 hours, when the water is completely removed, gradually raise the temperature to 150°C. At this time, the transparency of the solution gradually increases. Xylene begins to evaporate at 150°C. Keep the temperature at 150-195°C. After 1 hour, the xylene is completely removed. Continue to keep the temperature at 150°C for 1 hour. After the reaction is completed, cool down to 120°C and discharge the material to obtain the initiator. (2) The initiator and catalyst are put into the reactor and sealed. The air in the reactor is replaced by nitrogen purging and the reactor is evacuated to a vacuum. The feed valve is opened and the designed amount of ethylene oxide (EO) is slowly introduced. The pressure gauge reading is controlled between 0.19 and 0.21 MPa. After the ethylene oxide is added, the feed valve is closed. When the pressure gauge reading of the reactor decreases to negative pressure, the reaction ends. The reactor is cooled down and discharged to obtain intermediate product 1. (3) Add intermediate product 1 and catalyst into the reactor and seal it. Use nitrogen to purge the air in the reactor and draw it to a vacuum. Open the feed valve and slowly introduce the designed amount of propylene oxide (PO). Control the pressure gauge reading between 0.19 and 0.21 MPa. After the propylene oxide is added, close the feed valve. When the pressure gauge reading of the reactor decreases to negative pressure, the reaction ends and intermediate product 2 is obtained. (4) Add intermediate product 2 and catalyst into the reactor and seal it. Use nitrogen to purge the air in the reactor and draw it to a vacuum. Open the feed valve and slowly introduce the designed amount of ethylene oxide. Control the pressure gauge reading between 0.19 and 0.21 MPa. After the ethylene oxide is added, close the feed valve. When the pressure gauge reading in the reactor decreases to negative pressure, the reaction ends and polyether A is obtained. (5) Dissolve polyether A in 70% methanol solution, stir and heat to 50~60℃, add potassium hydroxide solution, stir for 20min, then heat to 60~80℃, slowly add 30% sodium chloroacetate solution, control the addition time to 2~3h, until the 30% sodium chloroacetate solution is completely added, keep the temperature at 60~80℃, react for 8h, and obtain polyether water-soluble agent.

17. The application of the nonionic-anionic water purification agent according to claim 1 in water treatment.

18. A water treatment method, characterized in that, Use the nonionic-anionic water purification agent as described in claim 1.

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