Method for harmlessly treating waste acid residues of petroleum sulfonate device

Abstract

The invention discloses a harmless treatment method for waste acid residues of a mahogany petroleum sulfonate device. The method comprises the following steps: S1, conveying a dissolving solution into a primary dissolving tank; s2, an acid sludge containing tank is placed close to the feeding port side of the first-stage dissolving tank, and a sprayer is fixed to the upper portion of the acid sludge containing tank; the dissolving solution circulating line is connected with an outlet of the secondary dissolving tank; s3, enabling the dissolving solution in the first-stage dissolving tank to automatically flow into a second-stage dissolving tank; circulating the dissolving solution in the first-stage dissolving tank and the second-stage dissolving tank; s4, after the circulation is stable, enabling the dissolving solution to flow out through a spraying pipe to scour the acid sludge in the acid sludge containing tank, and slowly adding the dissolved soft acid sludge into the first-stage dissolving tank to complete the sludge adding; after the acid sludge is fully dissolved, a mixed solution for dissolving the acid sludge is obtained; s5, separating the mixed solution in which the acid sludge is dissolved; and the separated liquid phase part enters a dissolving solution intermediate tank to be collected. According to the method, effective components can be rapidly and efficiently recycled, harmlessness of the acid sludge is achieved, and the risk of environmental pollution is reduced.

Description

Technical field:

[0001] The invention relates to the technical field of hazardous waste treatment, and in particular to a method for harmlessly treating waste acid residue from a petroleum sulfonate device. Background technology:

[0002] During the production process of the membrane sulfonation continuous production of petroleum sulfonate for oil recovery, acid slag, waste acid and other by-products will be produced in the gas-liquid separator and acid mist sedimentation separator. The acid slag will affect the interfacial activity of the petroleum sulfonate product and cause the inorganic salt content in the product to exceed the standard. In addition, due to the high viscosity of the acid slag, it is easy to block the material pipeline in the subsequent production process, adhere to the pump cavity to affect the pump efficiency, and adhere to the inner wall of the heat exchanger to reduce the heat exchange efficiency. The existing treatment method is to manually clean it up and treat it as industrial hazardous waste, increasing the risk of environmental pollution. Summary of the invention:

[0003] The present invention aims to solve the problem that the existing manual cleaning increases the risk of environmental pollution as industrial hazardous waste, and provides a method for harmless treatment of waste acid residue from a petroleum sulfonate device. The method for harmless treatment of waste acid residue from a petroleum sulfonate device can quickly and efficiently recover effective components, and the separated insoluble components can be treated as general solid waste, thereby achieving harmless treatment of acid residue and reducing the risk of environmental pollution.

[0004] The present invention solves the problem through the following technical solution: The method for harmless treatment of waste acid residue from a petroleum sulfonate device comprises the following steps:

[0005] S1. After the preparation work is completed, prepare the dissolving solution; transport the prepared dissolving solution to the primary dissolving tank through the dissolving solution delivery pump; maintain the temperature at 60-70°C; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the outlet of the secondary dissolving tank is connected to the dissolving solution circulation line;

[0006] S2. Place the acid slag holding tank near the feeding port of the primary dissolving tank, and fix a sprayer above the acid slag holding tank; connect the sprayer to the dissolving liquid circulation line through a hose;

[0007] S3, open the bottom valve of the primary dissolving tank, so that the solution in the primary dissolving tank flows into the secondary dissolving tank through the intermediate pipeline by gravity. When the liquid level in the secondary dissolving tank reaches a certain level, start the solution circulation pump to circulate the solution in the primary dissolving tank and the secondary dissolving tank;

[0008] S4. After the dissolving liquid circulates stably in the primary dissolving tank and the secondary dissolving tank, the feeding port of the primary dissolving tank is opened, the acid slag holding tank is tilted, and the valve of the dissolving liquid circulation line leading to the spray pipe is opened at the same time, so that the dissolving liquid flows out through the spray pipe to flush the acid slag in the acid slag holding tank, and the inclination angle of the acid slag holding tank is gradually increased to slowly add the dissolved soft acid slag to the primary dissolving tank. After the slag is added, the spray pipe valve and the feeding port are closed; the agitator in the primary dissolving tank is turned on to stir, and after ensuring that the acid slag is fully dissolved, a mixed solution of dissolved acid slag is obtained;

[0009] S5. The secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; the dissolving liquid circulation line is opened to the centrifuge inlet valve, and the mixed liquid of the dissolved acid slag circulating in the dissolving tank is transported to the centrifuge for separation; the insoluble matter is packed in barrels at the slag outlet of the centrifuge, and the liquid phase is collected in the dissolving liquid intermediate tank after separation by the centrifuge.

[0010] Further, the preparation work of step S1 includes: connecting the harmless treatment system of waste acid slag of the petroleum sulfonate device, the system includes a dissolving liquid preparation tank, the dissolving liquid preparation tank is connected to the dissolving agent, water and alkali feeding lines; the outlet of the dissolving liquid preparation tank is connected to the primary dissolving tank through a dissolving liquid delivery pump; the primary dissolving tank is equipped with an agitator; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the intermediate pipeline is connected to a filter; the outlet of the secondary dissolving tank is respectively connected to a sprayer, a primary dissolving tank and a centrifuge through a dissolving liquid circulation line; the dissolving liquid circulation line is connected to a dissolving liquid circulation pump; an acid slag holding tank is placed at the feeding port of the primary dissolving tank, and a sprayer is fixed above the acid slag holding tank; the sprayer is connected to the dissolving liquid circulation line by a hose; the secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; valves are respectively installed at the dissolving liquid circulation line to the sprayer and at the centrifuge inlet;

[0011] The acid slag holding tank containing sulfonate acid slag is delivered to the acid slag holding tank platform, the acid slag holding tank is hoisted by a manual hoist close to the side guard of the dissolving liquid stirring tank, and the sprayer is fixed on the outer edge of the acid slag holding tank.

[0012] Furthermore, the filter is a basket filter.

[0013] Furthermore, the dissolving solution prepared in step S2 is composed of water, alkali and a dissolving agent;

[0014] The composition and mass percentage of the dissolving agent are: 15-20% water-soluble dispersant, 5-10% water-soluble antioxidant, 5-10% water-soluble imidazoline, 20-30% polyol, 30-55% deionized water, and 5-15% sodium carbonate.

[0015] Furthermore, the water-soluble dispersant is sodium hexametaphosphate; the water-soluble antioxidant is sodium bisulfite; and the polyol is glycerol.

[0016] Furthermore, the acid slag holding tank in step S2 is made of 304 material, with an overall rectangular structure. The long side cross-section is a trapezoid that is wide at the top and narrow at the bottom, with a taper of 15°. One side of the short side is completely welded, and the other side is opened to make a movable opening. A matching movable baffle is made, and the upper edge of the movable baffle is fixed to the acid slag holding tank with an axis so that it can be opened when dumping, and is tightened with quick-opening bolts when holding to ensure that there is no leakage. A 40mm wide outer edge is made on the long side of the holding tank to fix the spray cleaning pipe rack.

[0017] Furthermore, the step S2 sprayer includes a plurality of spray pipes and a pipe rack, the lower part of the pipe rack is connected to the spray pipes arranged in parallel; three rows of φ5mm holes are opened at the bottom of each spray pipe, the liquid sprayed from the holes is spaced at an angle of 15° and evenly distributed, and the blind end is plugged with a wire.

[0018] Furthermore, when the liquid level of the secondary dissolving tank reaches 20% in step S3, the dissolving liquid circulation pump is turned on to circulate the dissolving liquid in the primary dissolving tank and the secondary dissolving tank.

[0019] Furthermore, in step S4, the agitator in the first dissolving tank is turned on to stir for 1.5 to 2 hours to ensure that the acid residue is fully dissolved, and then the mixture of the dissolved acid residue is obtained by stirring.

[0020] Furthermore, the liquid phase after centrifuge separation collected in the intermediate tank of step S5 is back-blended into the petroleum sulfonate product at 3% to 5% (wt) to form a back-blended petroleum sulfonate final product;

[0021] The centrifuge is a horizontal screw centrifuge, which can process and separate the dissolved liquid of acid slag with particles smaller than φ10mm.

[0022] Compared with the above background technology, the present invention has the following beneficial effects:

[0023] 1. This method has the characteristics of simple production process and stable product quality control.

[0024] 2. This method can recover the effective components in the acid slag, reduce the production cost of petroleum sulfonate, and realize the clean production of the petroleum sulfonate device.

[0025] 3. After the acid residue is dissolved by this method, the mixed liquid can be separated by a centrifuge. The solid obtained after the separated solid phase is dried has no odor, and the acid residue dissolution recovery amount is ≥85% (g / g)

[0026] 4. After the mixed solution is fully dissolved, it is centrifuged to remove the insoluble matter in the dissolved solution to obtain the final product. The product can be mixed back into the petroleum sulfonate product produced by the company at a ratio of 3% to 5% (wt). The various indicators of the petroleum sulfonate product after mixing meet the standard indicator requirements, and the oil recovery efficiency is greater than 26%.

[0027] 5. The product quality indicators after back-blending of acid slag dissolution liquid and petroleum sulfonate meet the standard of "QSY QL0145-2020 Petroleum Sulfonate, an Oil Displacement Agent for Enhanced Oil Recovery".

[0028] 6. Analysis shows that the soluble matter in the acid slag is as high as 89%. Therefore, the effective components can be quickly and efficiently recovered by the method of the present invention after being dissolved by a high-efficiency solvent. The separated insoluble components can be treated as general solid waste to achieve harmlessness of the acid slag. Description of the drawings:

[0029] Attached Figure 1 The present invention is a flow chart of a method for harmless treatment of waste acid residue from a petroleum sulfonate device. Specific implementation method:

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0031] like Figure 1 As shown, the method for harmless treatment of waste acid residue from a petroleum sulfonate device of the present invention comprises the following steps:

[0032] S1. After the preparation work is completed, prepare the dissolving solution; transport the prepared dissolving solution to the primary dissolving tank through the dissolving solution delivery pump; maintain the temperature at 60-70°C; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the intermediate pipeline is connected with a filter; the filter is a basket filter.

[0033] The preparation work includes: connecting the harmless treatment system of waste acid slag of the petroleum sulfonate device, the system includes a dissolving liquid preparation tank, the dissolving liquid preparation tank is connected to the dissolving agent, water and alkali feeding lines; the outlet of the dissolving liquid preparation tank is connected to the primary dissolving tank through a dissolving liquid delivery pump; the primary dissolving tank is equipped with an agitator; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the intermediate pipeline is connected to a filter; the outlet of the secondary dissolving tank is respectively connected to the sprayer, the primary dissolving tank and the centrifuge through a dissolving liquid circulation line; the dissolving liquid circulation line is connected to a dissolving liquid circulation pump; an acid slag holding tank is placed at the feeding port of the primary dissolving tank, and a sprayer is fixed above the acid slag holding tank; the sprayer is connected to the dissolving liquid circulation line by a hose; the secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; valves are respectively installed at the dissolving liquid circulation line to the sprayer and at the centrifuge inlet.

[0034] The acid slag holding tank containing sulfonate acid slag is delivered to the acid slag holding tank platform, the acid slag holding tank is hoisted by a manual hoist close to the side guard of the dissolving liquid stirring tank, and the sprayer is fixed on the outer edge of the acid slag holding tank.

[0035] S2. Place the acid slag holding tank near the feeding port of the primary dissolving tank, and fix a sprayer above the acid slag holding tank; connect the sprayer to the dissolving liquid circulation line through a hose;

[0036] The prepared dissolving solution consists of water, alkali and a dissolving agent;

[0037] The composition and mass percentage of the dissolving agent are: 15-20% water-soluble dispersant, 5-10% water-soluble antioxidant, 5-10% water-soluble imidazoline, 20-30% polyol, 30-55% deionized water, 5-15% sodium carbonate. The water-soluble dispersant is sodium hexametaphosphate; the water-soluble antioxidant is sodium bisulfite; and the polyol is glycerol.

[0038] The acid slag holding tank in step S2 is made of 304 material, with an overall rectangular structure. The long side section is a trapezoid that is wide at the top and narrow at the bottom, with a taper of 15°. One short side is completely welded, and the other side is open to form a movable opening. A matching movable baffle is made, and the upper edge of the movable baffle is fixed to the acid slag holding tank with an axis so that it can be opened when dumping and fastened with quick-opening bolts when holding to ensure that there is no leakage. A 40mm wide outer edge is made on the long side of the holding tank to fix the spray cleaning pipe rack.

[0039] The step S2 sprayer comprises a plurality of spray pipes and a pipe rack, the lower part of the pipe rack is connected to the spray pipes arranged in parallel; there are three spray pipes; three rows of φ5mm holes are opened at the bottom of each spray pipe, the liquid sprayed from the holes is spaced at an angle of 15° and evenly distributed, and the blind end is plugged with a wire.

[0040] S3, open the bottom valve of the primary dissolving tank, so that the solution in the primary dissolving tank flows into the secondary dissolving tank through the intermediate pipeline by gravity. When the liquid level in the secondary dissolving tank reaches 20%, start the solution circulation pump to circulate the solution in the primary dissolving tank and the secondary dissolving tank;

[0041] S4. After the dissolving liquid circulates stably in the primary dissolving tank and the secondary dissolving tank, the feeding port of the primary dissolving tank is opened, the acid slag holding tank is tilted, and the valve of the dissolving liquid circulation line leading to the spray pipe is opened at the same time, so that the dissolving liquid flows out through the spray pipe to flush the acid slag in the acid slag holding tank, and the inclination angle of the acid slag holding tank is gradually increased to slowly add the dissolved soft acid slag to the primary dissolving tank. After the slag is added, the spray pipe valve and the feeding port are closed; the agitator in the primary dissolving tank is turned on and stirred for 1.5 to 2 hours to ensure that the acid slag is fully dissolved, and a mixed solution of dissolved acid slag is obtained;

[0042] S5. The secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; the dissolving liquid circulation line is opened to the centrifuge inlet valve, and the mixed liquid of the dissolved acid slag circulating in the dissolving tank is transported to the centrifuge for separation; the insoluble matter is packed in barrels at the slag outlet of the centrifuge, and the liquid phase is collected in the dissolving liquid intermediate tank after separation by the centrifuge.

[0043] The liquid phase collected in the intermediate tank after centrifuge separation in step S5 is back-blended into the petroleum sulfonate product at 3% to 5% (wt) to form the back-blended petroleum sulfonate final product; the centrifuge is a horizontal screw centrifuge; it can process and separate the dissolved liquid of acid slag with particles smaller than φ10mm.

[0044] Embodiment 1:

[0045] 1. Add 1000kg of fresh water, 105kg of 36% sodium hydroxide and 11.3kg of proprietary solvent into the dissolving solution preparation tank. Keep the temperature of the preparation tank at 60-70℃. Stir and mix for 1.5-2 hours. Use the dissolving solution delivery pump to deliver all the dissolving solution to the primary dissolving tank. Keep the temperature at 60-70℃ for standby use.

[0046] 2. Use a forklift to deliver the acid slag holding tank filled with acid slag to the acid slag holding tank platform, use a manual hoist to lift the acid slag holding tank close to the side guardrail of the primary dissolving liquid feeding port, then fix the spray pipe above the tank, and connect the spray pipe to the dissolving liquid circulation line through a hose.

[0047] 3. Open the bottom valve of the first-level dissolving tank, so that the solution of the acid residue in the first-level dissolving tank flows by gravity through the basket filter into the second-level dissolving tank. When the liquid level of the second-level dissolving tank reaches 20%, open the solution circulation pump to establish a circulation of the solvent in the first-level dissolving tank and the second-level dissolving tank. After the circulation is stable, open the feeding port of the first-level dissolving tank, tilt the acid residue holding tank with a manual hoist, and open the valve of the solution circulation line leading to the spray pipe at the same time, so that the solution flows out through the spray pipe to flush the acid residue. Gradually increase the tilt angle of the acid residue holding tank to slowly add the dissolved soft acid residue to the first-level dissolving tank. After the slag is added, close the spray pipe valve and the feeding port. Turn on the agitator of the first-level dissolving tank and stir for 1.5 to 2 hours to ensure that the acid residue is fully dissolved.

[0048] 4. Slowly open the circulating liquid line to the centrifuge inlet valve, adjust the valve opening to ensure that the dissolved liquid part circulates in the dissolving tank and enters the centrifuge for separation. After passing through the centrifuge, the solid insoluble matter is separated and packed in barrels at the centrifuge outlet. The liquid phase after removing the insoluble matter enters the collection tank through the centrifuge outlet for collection, and is back-mixed into the petroleum sulfonate product at 5% (wt) to form the final product.

[0049] The testing indicators of petroleum sulfonate products are as follows in Table 1:

[0050] Table 1

[0051]

[0052] The product obtained in Example 1 was tested and evaluated by the following parameters and methods:

[0053] 1. Interfacial tension: The spinning drop method in the enterprise standard Q / SY QL0145-2020 is used. The test temperature is 45°C, the rotation speed is 3000r / min~5000r / min, and the interfacial tension between the surfactant system and the target block crude oil is detected. Record once every 10 minutes, the entire measurement time is 120 minutes, and record the data.

[0054] 2. Determination of active matter: Based on the different solubility of active matter and unsulfonated oil in petroleum sulfonate products in isopropanol and n-pentane, the active matter and unsulfonated oil in the petroleum sulfonate products are separated by extraction and dried in an oven to measure the content of active matter in the petroleum sulfonate.

[0055] 3. Core flooding test plan: 0.3PV ternary composite flooding (1.2% weak base sodium carbonate + polymer 1440mg / L + 0.3% petroleum sulfonate final product, 40mPa·s) + 0.2PV polymer flooding (40mPa·s) + subsequent water flooding. The test results of the petroleum sulfonate product after back mixing are shown in Table 2.

[0056] Table 2

[0057]

[0058]

Claims

1. A method for harmless treatment of waste acid residue from a petroleum sulfonate device, characterized in that: The following steps are involved: S1. After the preparation work is completed, prepare the dissolving solution; transport the prepared dissolving solution to the primary dissolving tank through the dissolving solution delivery pump; maintain the temperature at 60-70°C; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the outlet of the secondary dissolving tank is connected to the dissolving solution circulation line; S2. Place the acid slag holding tank near the feeding port of the primary dissolving tank, and fix a sprayer above the acid slag holding tank; connect the sprayer to the dissolving liquid circulation line through a hose; S3, open the bottom valve of the primary dissolving tank, so that the solution in the primary dissolving tank flows into the secondary dissolving tank through the intermediate pipeline by gravity. When the liquid level in the secondary dissolving tank reaches a certain level, start the solution circulation pump to circulate the solution in the primary dissolving tank and the secondary dissolving tank; S4. After the dissolving liquid circulates stably in the primary dissolving tank and the secondary dissolving tank, the feeding port of the primary dissolving tank is opened, the acid slag holding tank is tilted, and the valve of the dissolving liquid circulation line leading to the spray pipe is opened at the same time, so that the dissolving liquid flows out through the spray pipe to flush the acid slag in the acid slag holding tank, and the inclination angle of the acid slag holding tank is gradually increased to slowly add the dissolved soft acid slag to the primary dissolving tank. After the slag is added, the spray pipe valve and the feeding port are closed; the agitator in the primary dissolving tank is turned on to stir, and after ensuring that the acid slag is fully dissolved, a mixed solution of dissolved acid slag is obtained; S5. The secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; the dissolving liquid circulation line is opened to the centrifuge inlet valve, and the mixed liquid of the dissolved acid slag circulating in the dissolving tank is transported to the centrifuge for separation; the insoluble matter is packed in barrels at the slag outlet of the centrifuge, and the liquid phase is collected in the dissolving liquid intermediate tank after separation by the centrifuge.

2. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 1, characterized in that: The preparation work of step S1 includes: connecting the harmless treatment system of waste acid slag of the petroleum sulfonate device, the system includes a dissolving liquid preparation tank, the dissolving liquid preparation tank is connected to the dissolving agent, water and alkali feeding lines; the outlet of the dissolving liquid preparation tank is connected to the primary dissolving tank through a dissolving liquid delivery pump; the primary dissolving tank is equipped with an agitator; the primary dissolving tank is connected to the secondary dissolving tank through an intermediate pipeline; the intermediate pipeline is connected to a filter; the outlet of the secondary dissolving tank is respectively connected to a sprayer, a primary dissolving tank and a centrifuge through a dissolving liquid circulation line; the dissolving liquid circulation line is connected to a dissolving liquid circulation pump; an acid slag holding tank is placed at the feeding port of the primary dissolving tank, and a sprayer is fixed above the acid slag holding tank; the sprayer is connected to the dissolving liquid circulation line by a hose; the secondary dissolving tank is connected to the centrifuge through the dissolving liquid circulation line; valves are respectively installed at the dissolving liquid circulation line to the sprayer and at the centrifuge inlet; The acid slag holding tank containing sulfonate acid slag is delivered to the acid slag holding tank platform, the acid slag holding tank is hoisted by a manual hoist close to the side guard of the dissolving liquid stirring tank, and the sprayer is fixed on the outer edge of the acid slag holding tank.

3. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 2, characterized in that: The filter is a basket filter.

4. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 2 or 3, characterized in that: The dissolving solution prepared in step S2 is composed of water, alkali and a dissolving agent; The composition and mass percentage of the dissolving agent are: 15-20% water-soluble dispersant, 5-10% water-soluble antioxidant, 5-10% water-soluble imidazoline, 20-30% polyol, 30-55% deionized water, and 5-15% sodium carbonate.

5. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 4, characterized in that: The water-soluble dispersant is sodium hexametaphosphate; the water-soluble antioxidant is sodium bisulfite; and the polyol is glycerol.

6. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 5, characterized in that: The acid slag holding tank in step S2 is made of 304 material, with an overall rectangular structure. The long side section is a trapezoid that is wide at the top and narrow at the bottom, with a taper of 15°. One short side is completely welded, and the other side is open to form a movable opening. A matching movable baffle is made, and the upper edge of the movable baffle is fixed to the acid slag holding tank with an axis so that it can be opened when dumping and fastened with quick-opening bolts when holding to ensure that there is no leakage. A 40mm wide outer edge is made on the long side of the holding tank to fix the spray cleaning pipe rack.

7. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 6, characterized in that: The S2 sprayer includes a plurality of spray pipes and a pipe rack, the lower part of the pipe rack is connected to the spray pipes arranged in parallel; three rows of φ5mm holes are opened at the bottom of each spray pipe, the spray liquid from the holes is spaced at an angle of 15° and evenly distributed, and the blind end is plugged with a wire.

8. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 1, characterized in that: When the liquid level of the secondary dissolving tank reaches 20% in step S3, the dissolving liquid circulation pump is turned on to circulate the dissolving liquid in the primary dissolving tank and the secondary dissolving tank.

9. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 1, characterized in that: In step S4, the stirrer in the first dissolving tank is turned on to stir for 1.5 to 2 hours to ensure that the acid residue is fully dissolved, and then the mixture is stirred to obtain the dissolved acid residue.

10. The method for harmless treatment of waste acid residue from a petroleum sulfonate device according to claim 1, characterized in that: The liquid phase after centrifuge separation collected in the intermediate tank in step S5 is back-blended into the petroleum sulfonate product at 3% to 5% wt to form the back-blended petroleum sulfonate final product; the centrifuge is a horizontal screw centrifuge; The dissolved liquid of the acid slag with particles smaller than φ10mm is processed and separated.

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