A method for removing micro-water from polar lubricating oil based on coordination of electric field polarization and lattice field

Abstract

This invention discloses a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and crystal field. The method includes: first, filtering the polar lubricating oil containing trace amounts of water to remove mechanical impurities, then heating it to 25℃~35℃; then introducing it into an electric field polarization unit, where it is polarized using an electric field until the dielectric constant of the lubricating oil increases by 3%~8% relative to its initial value; next, introducing it into a crystal field unit, where it is stirred and mixed to fully contact an inorganic crystalline particle adsorbent with a superhydrophilic surface, using the adsorbent to remove water from the oil; finally, passing it through a fine filtration unit to remove the water-swollen inorganic crystalline particle adsorbent, thus completing the micro-water removal of the polar lubricating oil. This invention achieves efficient and deep dehydration of polar lubricating oil at room temperature, with advantages such as low energy consumption, low cost, no additive loss, and no impact on oil performance.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil technology, specifically relating to a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field. Background Technology

[0002] Ester oils and other polar lubricants are widely used in high-end equipment fields such as aerospace due to their excellent lubrication performance. Unlike ordinary mineral lubricants, polar lubricants contain polar groups such as ester groups in their molecules, which can form hydrogen bonds with water molecules, enhancing the interaction between oil and water and forming a highly stable oil-water emulsion system. This significantly increases the difficulty of oil-water separation, which is currently the key factor restricting the deep dehydration of polar lubricants.

[0003] In existing technologies, vacuum heating is often used for deep dehydration of oils. However, this method is slow, inefficient, and energy-intensive. Furthermore, vacuum heating can cause additives in the oil to volatilize, damaging oil performance and failing to meet the deep dehydration requirements of polar lubricants. Meanwhile, coalescence separation processes are limited by the separation capacity of coalescing filter elements, typically reducing water content to only 0.01%–0.02%, which cannot meet the more stringent deep dehydration requirements of polar lubricants. In addition, some existing technologies use nanoscale inorganic sulfate crystals for micro-water removal from mineral lubricants. However, for polar lubricants with strong hydrogen bond interactions, relying solely on the hydrophilic coalescence effect of the nanoscale inorganic sulfate crystal surface to break hydrogen bond connections is limited in effectiveness and slow. On the other hand, residual nanoscale adsorbents are difficult to completely remove. If nanoscale ultrafiltration is used for separation, effective additives in the oil will also be removed, affecting oil performance.

[0004] In summary, how to efficiently remove micro-water from polar lubricating oils without damaging oil additives or affecting oil performance is a pressing technical challenge in the field of lubricating oil purification for high-end equipment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field, so as to solve the problems of difficult deep dehydration, low efficiency and easy loss of additives caused by the strong interaction of oil and water hydrogen bonds in polar lubricating oil.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field, characterized by comprising the following steps: Polar lubricating oil containing trace amounts of water is filtered to remove mechanical impurities before entering an oil heater and being heated to 25℃~35℃. The heated lubricating oil enters the electric field polarization unit and is polarized by an applied electric field until the dielectric constant of the lubricating oil increases by 3% to 8% relative to its initial value. The polarized lubricating oil enters the crystal field unit and is fully contacted with the inorganic crystal particle adsorbent with a superhydrophilic surface by stirring and mixing in the crystal field unit, thereby removing water from the oil using the inorganic crystal particle adsorbent. After the moisture is removed, the lubricating oil passes through a fine filtration unit to remove the inorganic crystal particles adsorbent that have absorbed water and swelled, thus completing the micro-water removal of the polar lubricating oil.

[0007] Furthermore, the polar lubricating oil containing trace amounts of water has a water content of 0.03% to 0.1% by mass.

[0008] Furthermore, the inorganic crystalline particle adsorbent with a superhydrophilic surface is anhydrous sodium sulfate particle adsorbent with a particle size of 10 μm to 30 μm.

[0009] Furthermore, the inorganic crystal particle adsorbent with a superhydrophilic surface is added to the lattice field unit under control via a feed valve.

[0010] Furthermore, the process of achieving sufficient contact in the lattice field unit through stirring and mixing is carried out at a stirring speed of 100 r / min to 150 r / min.

[0011] Furthermore, the filtration accuracy of the fine filtration unit is 5μm to 10μm.

[0012] Furthermore, the amount of anhydrous sodium sulfate particulate adsorbent added is a percentage of the mass of the polar lubricating oil. r %, the percentage by mass of water content in the polar lubricating oil w %, and the percentage increase in the dielectric constant of the lubricating oil relative to its initial value after polarization of the electric field polarization unit. p %, which satisfies the following relationship: r =1.1436×( p / 100) -0.1074 × w .

[0013] Furthermore, the mixing time for stirring and mixing in the lattice field unit is... t (min), and the particle size of the anhydrous sodium sulfate granular adsorbent. d (μm), and the stirring speed of the mixing process. v (r / min), satisfying the following relationship: t =0.769× d 1.8155 ×v -0.5 .

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention combines electric field polarization with lattice field adsorption, resulting in a significant synergistic effect and high dehydration efficiency. First, electric field polarization induces the directional alignment of polar molecules and water molecules in the oil-water system, weakening hydrogen bonding between oil and water molecules, disrupting the highly stable oil-water system, and increasing the migration rate and activity of water molecules. Subsequently, inorganic crystal particles with superhydrophilic surfaces efficiently capture water molecules in the lattice field. The synergistic effect between electric field pretreatment and subsequent adsorption significantly enhances the kinetics and final effect of deep dehydration. The entire process is carried out at room temperature, making it energy-efficient and environmentally friendly, avoiding the high energy consumption and high-temperature damage to oil additives and base oils caused by traditional vacuum heating methods, demonstrating significant technical and economic advantages.

[0015] This invention uses micron-sized anhydrous sodium sulfate particles as an adsorbent. These particles have a suitable size, allowing for complete removal through subsequent fine filtration units without leaving residue in the oil. Furthermore, since high-temperature vacuum operation is not required, and the adsorbent itself does not adsorb effective additives in the lubricating oil, the original performance of the oil remains unaffected. Additionally, the anhydrous sodium sulfate particles form sodium sulfate decahydrate after absorbing water, which can be regenerated through simple heating and dehydration for reuse, further reducing operating costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process for a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field, as described in this invention.

[0017] 1-Oil pump, 2-Filter, 3-Oil heater, 4-Dielectric constant measuring instrument, 5-Electric field polarization unit, 6-Applied electric field, 7-Control valve, 8-Feed valve, 9-Lattice field unit Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] A schematic flowchart of a method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field, as described in this invention, is shown below. Figure 1As shown. The polar lubricating oil containing trace amounts of water is pumped by oil pump (1) and filtered by filter (2) to remove mechanical impurities. Then it enters oil heater (3) and is heated to 25℃~35℃. The heated lubricating oil enters electric field polarization unit (5) and is polarized by external electric field (6). The dielectric constant is observed by dielectric constant measuring instrument (4) until the dielectric constant of the lubricating oil increases by 3%~8% relative to the initial value. The polarized lubricating oil enters lattice field unit (9) through control valve (7) and is fully contacted with inorganic crystal particle adsorbent with superhydrophilic surface added through feed valve (8) by stirring and mixing in lattice field unit. The inorganic crystal particle adsorbent is used to remove water from the oil. The lubricating oil after water removal is filtered by fine filtration unit (10) to remove the inorganic crystal particle adsorbent after water absorption and expansion, thus completing the removal of trace amounts of water from the polar lubricating oil.

[0020] Example 1 This embodiment is used to treat a certain type of ester-based aviation lubricating oil with an initial water content of 0.05% (by mass). The specific steps are as follows:

[0021] The polar lubricating oil containing trace amounts of moisture is pumped into a filter to remove mechanical impurities with a particle size greater than 10μm.

[0022] (2) Heat the filtered lubricating oil to 30°C using an oil heater.

[0023] (3) The heated lubricating oil enters the electric field polarization unit, and an electric field is applied to polarize it. The dielectric constant of the lubricating oil is monitored in real time until its dielectric constant increases by 5% relative to the initial value.

[0024] (4) The polarized lubricating oil enters the crystal lattice unit. Simultaneously, anhydrous sodium sulfate particulate adsorbent (particle size 20 μm, calculated according to formula) at a mass percentage of 0.057% of the lubricating oil is added through the feed valve. r =1.1436×( 5 / 100) -0.1074 (Calculated as 0.05 ≈ 0.057%). Turn on the stirrer and set the speed to 120 r / min. According to the formula... t =0.769×20 1.8155 ×120 -0.5 The mixing time is calculated to be approximately 15 minutes. During this period, the anhydrous sodium sulfate particles fully absorb the moisture from the oil.

[0025] (5) Pump the lubricating oil that has completed water adsorption into the fine filter unit. The fine filter element has a filtration accuracy of 8μm to remove anhydrous sodium sulfate particles that have absorbed water and expanded.

[0026] (6) The lubricating oil after treatment was collected and tested. Its water content was reduced to below 0.01%, and the key performance indicators of the oil did not change significantly before and after treatment.

[0027] Example 2 This embodiment is used to treat a certain type of phosphate ester fire-resistant hydraulic oil with an initial water content of 0.08% (by mass).

[0028] The specific steps are basically the same as in Example 1, with the following differences: The heating temperature is 25℃; the electric field polarization unit increases the dielectric constant of the lubricating oil by 8% relative to its initial value; the added anhydrous sodium sulfate granular adsorbent has a particle size of 30μm, and the amount added is calculated according to the formula. r =1.1436×(8 / 100) -0.1074 ×0.08≈0.0829%; the stirring speed is 150 r / min, and the stirring time is calculated according to the formula. t =0.769×30 1.8155 ×150 -0.5 ≈20 minutes; the fine filtration unit has a filtration accuracy of 10μm.

[0029] After treatment, the water content of the oil was reduced to below 0.01%, while the key performance indicators of the oil did not change significantly before and after treatment.

[0030] Example 3 This embodiment is used to treat a certain type of synthetic ester lubricating oil with an initial water content of 0.03% (by mass).

[0031] The specific steps are basically the same as in Example 1, with the following differences: The heating temperature is 35℃; the electric field polarization unit increases the dielectric constant of the lubricating oil by 3% relative to its initial value; the added anhydrous sodium sulfate granular adsorbent has a particle size of 10μm, and the amount added is calculated according to the formula. r =1.1436×(3 / 100) -0.1074 ×0.03≈0.0311%; the stirring speed is 100 r / min, and the stirring time is calculated according to the formula as t=0.769×10 1.8155 ×100 -0.5 ≈11 minutes; the fine filtration unit has a filtration accuracy of 5μm.

[0032] After treatment, the water content of the oil was reduced to below 0.01%, while the key performance indicators of the oil did not change significantly before and after treatment.

[0033] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for removing water from a polar lubricating oil based on the synergy of electric field polarization and lattice field, characterized in that, Includes the following steps: Polar lubricating oil containing trace amounts of water is filtered to remove mechanical impurities before entering an oil heater and being heated to 25℃~35℃. The heated lubricating oil enters the electric field polarization unit and is polarized by the electric field until the dielectric constant of the lubricating oil increases by 3% to 8% relative to its initial value; The polarized lubricating oil enters the crystal field unit and comes into full contact with the inorganic crystal particle adsorbent with a superhydrophilic surface through stirring and mixing in the crystal field unit. The stirring speed of the stirring and mixing is 100 r / min to 150 r / min, and the inorganic crystal particle adsorbent removes water from the oil. After the moisture is removed, the lubricating oil passes through a fine filtration unit to remove the inorganic crystal particles adsorbent that have absorbed water and swelled, thus completing the micro-water removal of the polar lubricating oil.

2. The method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field as described in claim 1, characterized in that, The polar lubricating oil containing trace amounts of water has a water content of 0.03% to 0.1% by mass.

3. The method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field as described in claim 1, characterized in that, The inorganic crystalline particle adsorbent with a superhydrophilic surface is anhydrous sodium sulfate particle adsorbent with a particle size of 10 μm to 30 μm.

4. The method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field as described in claim 1, characterized in that, The filtration accuracy of the fine filtration unit is 5μm to 10μm.

5. The method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field as described in claim 3, characterized in that, The amount of anhydrous sodium sulfate granular adsorbent added is a percentage of the mass of the polar lubricating oil. r %, the percentage by mass of water content in the polar lubricating oil w %, and the percentage increase in the dielectric constant of the lubricating oil relative to its initial value after polarization of the electric field polarization unit. p %, which satisfies the following relationship: r =1.1436×（ p / 100） -0.1074 × w 。 6. A method for removing micro-water from polar lubricating oil based on the synergy of electric field polarization and lattice field as described in claim 3 or 5, characterized in that, The mixing time for stirring and mixing in the lattice field unit is... t (min), and the particle size of the anhydrous sodium sulfate granular adsorbent. d (μm), and the stirring speed of the mixing process. v (r / min), satisfying the following relationship: t =0.769× d 1.8155 × v -0.5 .

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