Device for recycling silicone oil from alkali residue

Abstract

This invention provides a device for recycling silicone oil from alkali residue, comprising a dissolving kettle, a three-phase separator, an emulsion buffer tank, a centrifugal demulsifier, a brine preparation tank, a sodium salt storage tank, a potassium salt storage tank, and a magnesium salt storage tank. The alkali residue is introduced into the material inlet of the dissolving kettle, and the outlet of the dissolving kettle is connected to the material inlet of the three-phase separator. The alkali outlet at the bottom of the three-phase separator is used to output alkali solution, and the oil phase outlet at the top of the three-phase separator is used to output the oil phase. The emulsion outlet in the middle of the three-phase separator is connected to the inlet of the emulsion buffer tank, and the outlet of the emulsion buffer tank is connected to the material inlet of the centrifugal demulsifier. The outlets of the sodium salt, potassium salt, and magnesium salt storage tanks are respectively connected to the inlet of the brine preparation tank, and the outlet of the brine preparation tank is connected to the brine inlet of the centrifugal demulsifier. The silicone oil outlet of the centrifugal demulsifier is connected to the reflux port of the three-phase separator, and the wastewater outlet of the centrifugal demulsifier is used for drainage. This significantly improves the silicone oil recovery rate and the alkali reuse rate.

Description

Technical Field

[0001] This utility model belongs to the field of organosilicon technology, specifically relating to a device for recycling silicone oil from alkali residue. Background Technology

[0002] In the production of organosilicon, the alkaline residue produced after neutralizing silicone oil with solid alkali contains 3% to 10% unrecovered silicone oil and residual alkali solution. Currently, this alkaline residue is usually directly treated in an environmentally friendly manner, resulting in the waste of high-value components and posing environmental hazards. Because the silicone oil and alkali solution in the alkaline residue form a stable emulsion and are mixed with solid impurities, traditional separation technologies are difficult to efficiently recover silicone oil and alkali solution.

[0003] Therefore, there is an urgent need to develop a separation and reuse process for organosilicon alkali slag in order to achieve resource utilization, improve economic benefits and meet environmental protection requirements. Utility Model Content

[0004] This invention provides a device for recycling silicone oil from alkali residue, which solves the problem that the effective components in alkali residue cannot be efficiently recycled and utilized in the prior art.

[0005] This utility model provides a device for recycling silicone oil from alkaline residue, including a dissolving kettle, a three-phase separator, an emulsion buffer tank, a centrifugal demulsifier, a brine preparation tank, a sodium salt storage tank, a potassium salt storage tank, and a magnesium salt storage tank.

[0006] Among them, the alkali residue is fed into the material inlet of the dissolving kettle, the outlet of the dissolving kettle is connected to the material inlet of the three-phase separator, the alkali liquid outlet at the bottom of the three-phase separator is used to output alkali liquid, the oil phase outlet at the top of the three-phase separator is used to output oil phase, the emulsion outlet in the middle of the three-phase separator is connected to the inlet of the emulsion buffer tank, and the outlet of the emulsion buffer tank is connected to the material inlet of the centrifugal demulsifier.

[0007] The outlets of the sodium salt storage tank, potassium salt storage tank, and magnesium salt storage tank are connected to the inlet of the brine preparation tank, the outlet of the brine preparation tank is connected to the brine inlet of the centrifugal demulsifier, the silicone oil outlet of the centrifugal demulsifier is connected to the reflux port of the three-phase separator, and the wastewater outlet of the centrifugal demulsifier is used for drainage.

[0008] Compared with the prior art, the advantages of this utility model are as follows: after the alkaline residue is pretreated in the dissolving kettle, it enters the three-phase separator to output alkaline solution, oil phase and emulsion in layers. The emulsion enters the centrifugal demulsifier through the buffer tank. At the same time, the centrifugal demulsifier is injected with a composite brine of sodium salt, potassium salt and magnesium salt to enhance demulsification, which significantly improves the recovery rate of silicone oil and the reuse rate of alkaline solution. The stability of the emulsion is efficiently destroyed by the synergistic effect of multivalent ions. The separated silicone oil is returned to the three-phase separator for secondary purification, the alkaline solution is directly reused, and the wastewater is discharged in compliance with standards, realizing the recycling of resources.

[0009] Furthermore, it also includes a hot water tank; the outlet of the hot water tank is connected to the inlet of the dissolving vessel and the inlet of the brine preparation tank, respectively.

[0010] Furthermore, it also includes a brine metering tank, the outlet of which is connected to the brine inlet of the centrifugal demulsifier via the brine metering tank.

[0011] Furthermore, the dissolving vessel is positioned above the three-phase separator, the outlet of the dissolving vessel is located at the bottom of the dissolving vessel, and the material inlet of the three-phase separator is located at the top of the three-phase separator.

[0012] Furthermore, the brine preparation tank is equipped with a nitrogen bubbling device.

[0013] Furthermore, a detachable filter plate is installed in the upper middle part of the dissolving vessel.

[0014] Furthermore, it also includes an alkali tank for the silicone oil system, with the alkali outlet at the bottom of the three-phase separator connected to the inlet of the alkali tank for the silicone oil system.

[0015] Furthermore, it also includes a silicone oil recovery tank, with the oil phase outlet at the top of the three-phase separator connected to the inlet of the silicone oil recovery tank. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an alkaline residue recycling and silicone oil recovery device in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of a dissolving vessel in one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Dissolving kettle; 2. Three-phase separator; 3. Emulsion buffer tank; 4. Centrifugal demulsifier; 5. Brine preparation tank; 6. Hot water tank; 7. Silicone oil recovery tank; 8. Recovery oil pump; 9. Brine metering tank; 10. Silicone oil system alkali tank; 51. Sodium salt storage tank; 52. Potassium salt storage tank; 53. Magnesium salt storage tank; 101. Demountable filter plate. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Please see Figure 1This utility model provides a device for recycling silicone oil from alkali residue, including a dissolving kettle 1, a three-phase separator 2, an emulsion buffer tank 3, a centrifugal demulsifier 4, a brine preparation tank 5, a sodium salt storage tank 51, a potassium salt storage tank 52, and a magnesium salt storage tank 53; wherein, the alkali residue is introduced into the material inlet of the dissolving kettle 1, the outlet of the dissolving kettle 1 is connected to the material inlet of the three-phase separator 2, the alkali solution outlet at the bottom of the three-phase separator 2 is used to output alkali solution, the oil phase outlet at the top of the three-phase separator 2 is used to output oil phase, the emulsion outlet in the middle of the three-phase separator 2 is connected to the inlet of the emulsion buffer tank 3, and the outlet of the emulsion buffer tank 3 is connected to the material inlet of the centrifugal demulsifier 4;

[0022] The outlets of sodium salt storage tank 51, potassium salt storage tank 52 and magnesium salt storage tank 53 are respectively connected to the inlet of brine preparation tank 5. The outlet of brine preparation tank 5 is connected to the brine inlet of centrifugal demulsifier 4. The outlet of brine preparation tank 5 is connected to the brine inlet of centrifugal demulsifier 4. The silicone oil outlet of centrifugal demulsifier 4 is connected to the reflux port of three-phase separator 2. The wastewater outlet of centrifugal demulsifier 4 is used for drainage.

[0023] The alkaline residue of this invention originates from the waste residue generated during the production of organosilicon, after the silicone oil is neutralized with solid alkalis (such as sodium hydroxide, sodium carbonate, etc.). Specifically, it is a byproduct formed during the neutralization, washing, or pH adjustment of acidic components using alkaline substances in processes such as organosilicon monomer synthesis, silicone oil refining, or post-treatment. This alkaline residue typically contains 85-95% sodium carbonate, 3-10% incompletely separated silicone oil, and 2-5% emulsion; among which, the silicone oil is a hydrolysis product of a high-boiling-point substance with a boiling point of 110-130℃, and its main component is a mixture of polymethylsiloxanes, with a structure mainly composed of silicon-oxygen bonds, silicon-carbon bonds, and silicon-silicon bonds, and with some branches; the main component of the emulsion is siloxane.

[0024] The stable oil-water-solid emulsion system of alkali residue leads to resource waste and environmental pressure if directly discarded. This invention provides a silicone oil recovery device that effectively separates and recycles the silicone oil and alkali solution from the alkali residue.

[0025] Specifically, the alkali residue enters the dissolving vessel 1 through the material inlet for stirring and dissolving. The dissolved material exits through the outlet of the dissolving vessel 1 and then enters the three-phase separator 2 through the material inlet for three-phase separation. The lower layer of the three-phase separator 2 yields an alkali solution for alkali washing and recycling. The upper layer of the three-phase separator 2 yields an oil phase for silicone oil product recycling. The middle layer yields an emulsion, which exits through the emulsion outlet in the middle of the three-phase separator 2 and is fed into an emulsion buffer tank 3, where it is then quantitatively processed. The sodium salt from sodium salt storage tank 51, the potassium salt from potassium salt storage tank 52, and the magnesium salt from magnesium salt storage tank 53 are fed into the brine preparation tank to prepare a composite brine. The composite brine is fed into the centrifugal demulsifier 4 through the brine inlet of the centrifugal demulsifier 4 and centrifuged to demulsify with the emulsion from the emulsion buffer tank 3. The recovered silicone oil obtained after demulsification is fed back into the three-phase separator 2 through the reflux port to participate in the three-phase separation process, further recovering the silicone oil in the alkali residue.

[0026] The device for recycling silicone oil from alkali residue provided by this utility model pre-treats the alkali residue in a dissolving kettle, and then it enters a three-phase separator to output alkali solution, oil phase and emulsion in layers. The emulsion enters a centrifugal demulsifier through a buffer tank. At the same time, a composite brine of sodium salt, potassium salt and magnesium salt is injected into the centrifugal demulsifier to enhance demulsification, which significantly improves the silicone oil recovery rate and alkali solution reuse rate. The stability of the emulsion is efficiently destroyed through the synergistic effect of multivalent ions. The separated silicone oil is returned to the three-phase separator for secondary purification, the alkali solution is directly reused, and the wastewater is discharged in compliance with standards, realizing the recycling of resources.

[0027] Furthermore, it also includes a hot water tank 6 and a brine metering tank 9; the outlet of the hot water tank 6 is connected to the inlet of the dissolving kettle 1 and the inlet of the brine preparation tank 5, respectively, and the outlet of the brine preparation tank 5 is connected to the brine inlet of the centrifugal demulsifier 4 through the brine metering tank 9.

[0028] In one specific embodiment, the dissolving vessel 1 is positioned above the three-phase separator 2, the outlet of the dissolving vessel 1 is located at the bottom of the dissolving vessel 1, and the material inlet of the three-phase separator 2 is located at the top of the three-phase separator 2. The dissolving material is transported to the three-phase separator 2 using the principle of hydrostatic equilibrium, further saving the power consumption for transporting the dissolving material.

[0029] Furthermore, the brine preparation tank 5 is equipped with a nitrogen bubbling device, which further saves energy consumption.

[0030] Further, please refer to Figure 2 The upper and middle parts of the dissolving vessel 1 are equipped with a detachable filter plate 101, which is used to filter mechanical impurities and cross-linked substances in the alkali residue.

[0031] Optionally, the oil phase obtained from the oil phase outlet at the top of the three-phase separator 2 can be sent to the silicone oil system via the silicone oil recovery tank 7 and the recovery oil pump 8, and the alkali solution obtained from the alkali solution outlet at the bottom of the three-phase separator 2 can be sent to the alkali tank 10 of the silicone oil system.

[0032] It is worth noting that the specific structure of the pipes connecting the various components is a conventional design in this field and will not be described in detail here, as long as the process flow is unobstructed. This invention does not limit the specific form of each component; all are existing devices in this field, and any device capable of performing its function is acceptable.

[0033] The method for recycling silicone oil from alkali residue using the device of this invention includes the following steps:

[0034] The alkali residue is stirred and dissolved to obtain the dissolved material;

[0035] The dissolved material is subjected to three-phase separation to obtain a lower layer of alkaline solution, an upper layer of oil phase, and an intermediate layer of emulsion; the alkaline solution is used for alkaline washing and recycling, and the oil phase is used for silicone oil recycling.

[0036] A composite brine solution is added to the emulsion for centrifugal demulsification to obtain recovered silicone oil and wastewater; the recovered silicone oil is then reused in the three-phase separation process; the composite brine solution includes sodium salt, potassium salt and magnesium salt.

[0037] The alkaline residue of this invention originates from the waste residue generated during the production of organosilicon, after the silicone oil is neutralized with solid alkalis (such as sodium hydroxide, sodium carbonate, etc.). Specifically, it is a byproduct formed during the neutralization, washing, or pH adjustment of acidic components using alkaline substances in processes such as organosilicon monomer synthesis, silicone oil refining, or post-treatment. This alkaline residue typically contains 85-95% sodium carbonate, 3-10% incompletely separated silicone oil, and 2-5% emulsion; among which, the silicone oil is a hydrolysis product of a high-boiling-point substance with a boiling point of 110-130℃, and its main component is a mixture of polymethylsiloxanes, with a structure mainly composed of silicon-oxygen bonds, silicon-carbon bonds, and silicon-silicon bonds, and with some branches; the main component of the emulsion is siloxane.

[0038] The stable oil-water-solid emulsion system of alkali residue makes direct disposal wasteful of resources and environmentally problematic. This invention's recycling process effectively separates and recycles the silicone oil and alkali solution from the alkali residue.

[0039] The method for recycling silicone oil from alkali residue provided by this utility model achieves efficient recovery and recycling of silicone oil and alkali solution from alkali residue through a synergistic process of stirring and dissolving, three-phase separation, and demulsification with composite brine. The synergistic effect of sodium, potassium, and magnesium salts in the composite brine significantly improves the demulsification efficiency, enabling efficient recovery of silicone oil. At the same time, the separated alkali solution can be directly reused in the production process. This not only solves the problems of silicone oil waste and environmental pollution in traditional alkali residue treatment, but also the entire process is simple, efficient, and low-cost. It uses conventional equipment, requires no complex additives, and has low energy consumption, providing an innovative and practical solution for the resource-based treatment of alkali residue in the organosilicon industry.

[0040] Furthermore, the stirring and dissolving process takes 1–3 hours, with a stirring speed of 30–50 rpm and a temperature of 55–75°C. This range of process parameters ensures that the alkali residue is fully dissolved and forms a homogeneous material system, further reducing energy waste.

[0041] Furthermore, the preparation temperature of the compound brine is 40–85℃. This temperature range is conducive to the full dissolution of each salt and the formation of a stable compound brine system, further improving the demulsification effect.

[0042] In one specific embodiment, during the preparation of the compound saline solution, nitrogen gas is introduced for bubbling treatment, and the nitrogen introduction rate is 5-30 m / s. 3 / h. Nitrogen bubbling can further promote the uniform dissolution of salts and further improve the demulsification effect.

[0043] Specifically, the mass ratio of sodium salt, potassium salt, and magnesium salt is 1:(0.2-0.7):(10-20). In the centrifugal demulsification process, the mass ratio of emulsion to compound brine is 10:(1-3). Sodium salt includes at least one of sodium chloride, sodium carbonate, sodium fatty alcohol alkyl sulfonate, sodium sulfate, and sodium nitrate; potassium salt includes at least one of potassium chloride, potassium carbonate, potassium sulfate, or potassium nitrate; magnesium salt includes at least one of magnesium chloride, magnesium nitrate, or magnesium sulfate.

[0044] The composite brine with the parameters specified above can produce a better synergistic demulsification effect, provide the best ionic environment, and significantly improve the silicone oil recovery rate.

[0045] Optionally, the centrifugal demulsification process is carried out at a speed of 3000–5000 r / min for 4–7 h.

[0046] The following is a detailed description of the alkaline residue recycling and silicone oil recovery device provided by this utility model through specific embodiments.

[0047] Example 1

[0048] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for stirring and dissolving for 1 hour to obtain the dissolved material.

[0049] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0050] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.2:10, and the temperature of the brine preparation tank is 40℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 10% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 3000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0051] Example 2

[0052] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle. The mixture was stirred and dissolved for 3 hours to obtain the dissolved material.

[0053] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0054] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.7:10, and the temperature of the brine preparation tank is 85℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier with a mass of 30% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 5000 r / min for 7 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0055] Example 3

[0056] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0057] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0058] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 40℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 10% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 3000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0059] Example 4

[0060] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0061] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0062] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 85℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 10% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 3000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0063] Example 5

[0064] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0065] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0066] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 65℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 10% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 3000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0067] Example 6

[0068] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0069] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0070] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 65℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier with a mass of 30% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 3000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0071] Example 7

[0072] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0073] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0074] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 65℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier with a mass of 30% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 5000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0075] Example 8

[0076] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0077] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0078] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 65℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 20% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 4000 r / min for 4 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0079] Example 9

[0080] The alkaline residue was passed into a dissolving kettle, and hot water was added to the dissolving kettle for 2 hours to stir and dissolve the residue, thus obtaining the dissolved material.

[0081] The dissolved material in the dissolving kettle is discharged into the three-phase separator for three-phase separation. The bottom alkaline solution is discharged into the alkaline tank of the silicone oil system for system alkaline washing. The top oil phase is sent to the silicone oil recovery tank. The material in the silicone oil recovery tank is sent to the silicone oil system for recovery via the recovery oil pump. The silicone oil recovery rate is 100%. The intermediate emulsion layer is sent to the emulsion buffer tank. The emulsion in the emulsion buffer tank is sent to the centrifugal demulsifier.

[0082] The brine preparation tank contains sodium chloride, potassium chloride, and magnesium chloride in a mass ratio of 1:0.5:15, and the temperature of the brine preparation tank is 65℃. After the brine is prepared, it is sent to the brine metering tank. The brine in the metering tank is then sent to a high-efficiency centrifugal demulsifier at a mass of 20% of the emulsion. The brine and emulsion are centrifuged and demulsified in the centrifugal demulsifier at a speed of 4000 r / min for 7 hours. The recovered silicone oil is colorless and transparent and is sent to a three-phase separator for further three-phase separation.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, they should be considered to be within the protection scope of this utility model.

Claims

1. A device for recycling silicone oil from alkaline residue, characterized in that, It includes a dissolving vessel, a three-phase separator, an emulsion buffer tank, a centrifugal demulsifier, a brine preparation tank, a sodium salt storage tank, a potassium salt storage tank, and a magnesium salt storage tank; Among them, the alkali residue is fed into the material inlet of the dissolving kettle, the outlet of the dissolving kettle is connected to the material inlet of the three-phase separator, the alkali liquid outlet at the bottom of the three-phase separator is used to output alkali liquid, the oil phase outlet at the top of the three-phase separator is used to output oil phase, the emulsion outlet in the middle of the three-phase separator is connected to the inlet of the emulsion buffer tank, and the outlet of the emulsion buffer tank is connected to the material inlet of the centrifugal demulsifier. The outlets of the sodium salt storage tank, potassium salt storage tank, and magnesium salt storage tank are connected to the inlet of the brine preparation tank, the outlet of the brine preparation tank is connected to the brine inlet of the centrifugal demulsifier, the silicone oil outlet of the centrifugal demulsifier is connected to the reflux port of the three-phase separator, and the wastewater outlet of the centrifugal demulsifier is used for drainage.

2. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, It also includes a hot water tank; the outlet of the hot water tank is connected to the inlet of the dissolving kettle and the inlet of the brine preparation tank, respectively.

3. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, It also includes a brine metering tank, the outlet of which is connected to the brine inlet of the centrifugal demulsifier via the brine metering tank.

4. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, The dissolving vessel is located above the three-phase separator, the outlet of the dissolving vessel is located at the bottom of the dissolving vessel, and the material inlet of the three-phase separator is located at the top of the three-phase separator.

5. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, The brine preparation tank is equipped with a nitrogen bubbling device.

6. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, The upper and middle parts of the dissolving vessel are equipped with detachable filter plates.

7. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, It also includes the alkali tank of the silicone oil system, with the alkali outlet at the bottom of the three-phase separator connected to the inlet of the alkali tank of the silicone oil system.

8. The device for recycling silicone oil from alkaline residue according to claim 1, characterized in that, It also includes a silicone oil recovery tank, with the oil phase outlet at the top of the three-phase separator connected to the inlet of the silicone oil recovery tank.

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