Horizontal coalescence phase splitter suitable for phase-change absorbent lean-rich liquid phase splitting

Abstract

The invention provides a horizontal coalescence phase splitter suitable for phase-change absorbent lean and rich liquid phase splitting. The horizontal coalescence phase splitter sequentially comprises a section I phase splitting buffer area, a section II coalescence phase splitting area and a section III gravity phase splitting area in the fluid flowing direction. The I-section split-phase buffer area is provided with a tangential feeding hole and a flow guide baffle plate; the section II coalescence split-phase area is filled with stainless steel mesh coalescence filler subjected to composite modification of AP adhesive and nano Al2O3; and a heavy phase outlet and a light phase outlet are formed in the section III gravity phase-splitting area. According to the horizontal phase splitter, the gas-liquid interface area is large, the gas-liquid movement directions are perpendicular to each other, gas-liquid phase balance is facilitated, and the separation effect is better; in addition, the liquid level is stable, when the incoming liquid flow changes, the liquid level change of the horizontal separator is small, the buffering capacity is high, and stable flow can be provided for downstream equipment; in addition, by adding the composite modified stainless steel mesh coalescence filler into the phase splitter, tiny liquid drops can be effectively captured and coalesced, the separation effect is further improved, and comprehensive liquid-liquid separation is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical separation devices, in particular to a horizontal coalescing phase separator suitable for phase-change absorbent lean and rich liquid phase separation. Background Art

[0002] Amine-based solvents are gaining increasing recognition for their ability to capture CO₂ emissions from fossil fuel combustion in industrial chemical absorption processes. To further reduce regeneration energy consumption, liquid-liquid biphasic absorbents have become a hot topic of research. By reducing the volume of the rich liquid after phase separation, they significantly improve the energy efficiency of CO₂ capture. Several phase-change absorbents have demonstrated excellent CO₂ capture performance, particularly with regeneration heat loads ranging from 2.0 to 2.4 GJ / t CO₂. Despite this, achieving effective dynamic phase separation in practical industrial applications remains challenging.

[0003] In actual industrial applications, it is usually necessary to ensure that the lean and rich liquids are effectively separated under continuous operation. At present, the mainstream separation methods mostly rely on traditional vertical phase separation equipment. When the evenly mixed phase change absorbent is pumped into the phase separator, it will temporarily reside in it. During this period, the lean phase and rich phase in the mixed liquid will naturally stratify, and then the rich phase (rich in CO2) will flow to the downstream process device (desorption tower), and the lean phase will be refluxed to the upstream process device (absorption tower). However, with the widespread application of traditional vertical phase separators in production practice, its structural limitations have gradually emerged, mainly reflected in the following aspects: when the feed port of the equipment is faced with high-speed liquid flow, a strong convection effect will be generated, resulting in frequent fluctuations in the phase separation interface, which seriously hinders the gravity-dominated natural stratification process of the liquid, thereby prolonging the time of the absorbent in the phase separation equipment, reducing the separation efficiency, and ultimately affecting the overall work performance.

[0004] Patent CN118698303A discloses a phase separation system that couples a coalescing device with a centrifugal phase separator, achieving efficient phase separation. However, this system has the following inherent drawbacks: the centrifugal phase separator must maintain a rotational speed of 1000-8000 r / min, resulting in high energy consumption; high-speed centrifugation can easily lead to secondary emulsification of the phase-change absorbent, posing a risk of emulsification; the system is complex, requiring additional centrifugal equipment and resulting in high maintenance costs. Patent CN204745744U discloses a phase separation structure that utilizes a coarse / fine two-stage coalescing packing within a horizontal container to achieve liquid-liquid separation. However, this system has limited phase separation efficiency, with a sudden change in flow rate between the coarse and fine packings, leading to secondary droplet breakage; a lack of interface control and a flow-guiding buffer structure results in poor phase separation stability; the packing material is unmodified (only stainless steel / polytetrafluoroethylene fiber is disclosed), and no testing has been conducted on phase-change absorbents, requiring further investigation for its suitability.

[0005] In summary, the existing technology obviously has inconveniences and defects in practical use, and it is urgent to develop a green and efficient separation technology suitable for phase change absorbents.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a horizontal coalescing phase separator suitable for phase separation of rich and lean liquids of phase change absorbents, which can overcome the shortcomings of phase separation of traditional phase separators, effectively improve the phase separation effect, accelerate the coalescence speed of the two phases, and significantly improve the phase separation efficiency.

[0008] The present invention provides a horizontal coalescing phase separator suitable for phase separation of rich and lean liquids of a phase change absorbent. The horizontal coalescing phase separator comprises, in sequence along the direction of fluid flow: a phase separation buffer zone of section I, a coalescing phase separation zone of section II, and a gravity phase separation zone of section III; the phase separation buffer zone of section I is provided with a tangential feed port and a flow guide baffle; the coalescing phase separation zone of section II is filled with a stainless steel mesh coalescing filler modified by an AP adhesive-nano-Al2O3 composite; the gravity phase separation zone of section III is provided with a heavy phase outlet and a light phase outlet.

[0009] Preferably, the length of the phase separation buffer zone in section I accounts for 20-25% of the total length of the phase separator. A buffer zone that is too long will result in a large demand for solution in the phase separator, while a buffer zone that is too short will not play a buffering role in reducing the flow rate of the absorbent. It has been verified that a buffer zone length of 20-25% is the most suitable.

[0010] Preferably, the feed port is connected to the absorption tower via a liquid pump.

[0011] Preferably, the heavy phase outlet and the light phase outlet are connected to the desorption tower and the absorption tower respectively through liquid pumps.

[0012] Preferably, the phase separator is made of quartz glass with a visible light transmittance of ≥90%, and the phase separation buffer zone I, the coalescence phase separation zone II and the gravity phase separation zone III can observe the state of the liquid flow process.

[0013] Preferably, the preparation method of the agglomerated filler comprises the following steps:

[0014] S1. Prepare aluminum phosphate binder: dilute orthophosphoric acid with deionized water, add Al(OH)3 at a molar ratio of P / Al = 3:1, and stir at 100°C-120°C for a period of time;

[0015] S2. Preparing a composite coating: dissolving the aluminum phosphate binder obtained in step S1 in deionized water, adding Al2O3 nanoparticles dispersed in anhydrous ethanol, and ultrasonically treating for a period of time to obtain an AP binder-nano-Al2O3 composite coating;

[0016] S3. Base treatment: ultrasonically clean the stainless steel mesh in deionized water and anhydrous ethanol several times, then soak it in hydrochloric acid for a period of time, and then ultrasonically clean it again after soaking to prepare a substrate;

[0017] S4, composite modification: dip-coating the composite coating obtained in step S2 on the substrate treated in step S3, and preparing AP adhesive-nano-Al2O3 composite modified stainless steel mesh agglomerated filler through step heat treatment.

[0018] Preferably, the AP adhesive-nano-Al2O3 composite coating used for phase-change absorber separation exhibits a contact angle difference of ≥104° with organic amines, with the lean phase exhibiting 142°±3° and the rich phase exhibiting 38°±2°. The contact angle reflects hydrophilicity and hydrophobicity, with larger contact angles indicating strong hydrophilicity and smaller contact angles indicating strong hydrophobicity. The present invention utilizes the AP adhesive-nano-Al2O3 composite coating for phase-change absorber separation, and the large difference in contact angles between the lean and rich phases indicates a significant difference in hydrophilicity, facilitating phase separation.

[0019] Preferably, the phase-change absorbent is an organic amine-based ternary composite system comprising the following components: 20-40 wt% organic amine, 40-60 wt% physical solvent, and 15-25 wt% water; more preferably, 30 wt% organic amine, 50 wt% physical solvent, and 20 wt% water. In the present invention, the use of an organic amine-based ternary composite system facilitates phase separation while maintaining a high CO₂ loading capacity.

[0020] Preferably, the organic amine is selected from at least one of monoethanolamine (MEA), tetraethylenepentamine (TEPA), and triethylenetetramine (TETA); and the physical solvent is selected from at least one of polyethylene glycol dimethyl ether (NHD), triethylene glycol dimethyl ether (TGDE), sulfolane (TMS), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), and n-propanol.

[0021] In the present invention, the monoethanolamine in the organic amine has a fast absorption rate and a high loading capacity; the triethylene glycol dimethyl ether and cyclopentane in the physical solvent have good thermal stability and a good phase separation effect.

[0022] Preferably, the organic amine-based ternary composite system is selected from any one of the following groups:

[0023] (Ⅰ) monoethanolamine, triethylene glycol dimethyl ether and water;

[0024] (II) Monoethanolamine, sulfolane and water.

[0025] The present invention has at least the following beneficial effects:

[0026] (1) The gas-liquid interface area in the horizontal phase separator of the present invention is large, and the gas-liquid movement directions are perpendicular to each other, which is conducive to the gas-liquid reaching phase equilibrium and better separation effect;

[0027] (2) The liquid level in the horizontal phase separator of the present invention is stable. When the incoming liquid flow rate changes, the liquid level of the horizontal separator changes little, and the buffering capacity is strong, which can provide a stable flow rate for downstream equipment;

[0028] (3) Coalescing separation technology is a form of liquid-liquid separation technology that utilizes the properties of materials (surface characteristics, fiber structure) to enlarge small droplets of the dispersed phase. Under the action of gravity and other driving forces, the dispersed phase is removed from the continuous phase. The present invention effectively captures and coalesces tiny droplets by adding a stainless steel mesh coalescing filler modified with AP adhesive and nano-Al2O3 composite to the coalescing phase separator, further improving the separation effect and achieving comprehensive liquid-liquid separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of the coalescing phase separator provided by the present invention.

[0031] Figure 2 Schematic diagram of the phase separation of rich and lean liquids in the coalescing phase separator provided by the present invention.

[0032] Figure 3 This is a graph showing the CO2 load and rich phase ratio of absorbents with different components provided by the present invention.

[0033] Figure 4 This is a graph showing the effect of different CO2 loads on absorbent viscosity of MEA / TGDE / H2O provided by the present invention.

[0034] Figure 5 This is a comparison chart of the affinity of MSSM and SSM provided by the present invention to absorbent lean and rich liquids.

[0035] Explanation of the accompanying symbols: 1. Feed inlet; 2. Coagulation filler; 3. Heavy phase outlet; 4. Light phase outlet; 5. Section I phase separation buffer zone; 6. Section II coalescence phase separation zone; 7. Section III gravity phase separation zone. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] Example

[0040] like Figure 1 As shown, this embodiment is a horizontal coalescing phase separator suitable for phase change absorbent rich and lean liquid phase separation, which includes: a phase separation buffer zone 5, a coalescing phase separation zone 6 and a gravity phase separation zone 7 in the direction of fluid flow; the phase separation buffer zone 5 is provided with a tangential feed port 1 and a guide baffle; the coalescing phase separation zone 6 is filled with a stainless steel mesh coalescing filler 2 modified with an AP binder-nano-Al2O3 composite; the gravity phase separation zone 7 is provided with a heavy phase outlet 3 and a light phase outlet 4. The schematic diagram of the rich and lean liquid phase separation in the coalescing phase separator is shown in FIG. Figure 2 shown.

[0041] In this embodiment, the length of the phase splitting buffer zone I accounts for 20-25% of the total length of the phase splitter.

[0042] In this embodiment, the feed port 1 is connected to the absorption tower via a liquid pump.

[0043] In this embodiment, the heavy phase outlet 3 and the light phase outlet 4 are connected to the desorption tower and the absorption tower respectively through liquid pumps.

[0044] In this embodiment, the phase splitter is made of quartz glass with a visible light transmittance of ≥90%.

[0045] In this embodiment, the preparation method of the agglomerated filler 2 includes the following steps:

[0046] S1. Prepare aluminum phosphate binder: dilute 85 wt% orthophosphoric acid to 60 wt% by adding deionized water, then add Al(OH)3 at a molar ratio of P / Al=3:1, and stir at 100°C-120°C for 3-4 hours;

[0047] S2. Preparing a composite coating: mixing the aluminum phosphate binder obtained in step S1 with deionized water in a mass ratio of 2:5, adding Al2O3 nanoparticles dispersed in anhydrous ethanol (the mass ratio of nanoparticles to anhydrous ethanol is 1:12), and ultrasonically treating for 10-20 minutes to obtain an AP binder-nano-Al2O3 composite coating;

[0048] S3. Substrate treatment: ultrasonically clean the stainless steel mesh (SSM) in deionized water and anhydrous ethanol several times, then soak it in 2 mol / L hydrochloric acid for 20 ± 2 h. After soaking, ultrasonically clean it again to prepare the substrate.

[0049] S4, composite modification: The composite coating obtained in step S2 is dip-coated on the substrate treated in S3, and subjected to step heat treatment (120°C × 2h → 240°C × 1h) to prepare a modified stainless steel mesh (MSSM) with a coating thickness of 20±2μm.

[0050] In this embodiment, the AP adhesive-nano-Al2O3 composite coating is used for phase change absorber phase separation, and the contact angle difference between the AP adhesive and the organic amine is ≥104°, 142°±3° for the lean phase and 38°±2° for the rich phase.

[0051] In this embodiment, the phase-change absorbent is an organic amine-based ternary composite system, comprising the following components: 20-40 wt% organic amine, 40-60 wt% physical solvent, and 15-25 wt% water.

[0052] In this embodiment, the organic amine is selected from at least one of monoethanolamine, tetraethylene pentamine, and triethylene tetramine; the physical solvent is selected from at least one of polyethylene glycol dimethyl ether, triethylene glycol dimethyl ether, cyclopentane, dimethyl sulfoxide, N-methylpyrrolidone, and n-propanol.

[0053] In this embodiment, the organic amine-based ternary composite system is selected from any one of the following groups:

[0054] (Ⅰ) monoethanolamine, triethylene glycol dimethyl ether and water;

[0055] (II) Monoethanolamine, sulfolane and water.

[0056] Test Example 1: MEA / TGDE / H2O Coalescing and Phase Separation Test

[0057] (1) Preparation of phase-change absorbent: The absorbents in this test example are used to capture CO2. The components of each group of absorbents are MEA / TGDE / H2O. The total mass of each group of absorbents is 50g. They are prepared according to the following ratio: the mass ratio of monoamine / single physical solvent / water is 3:5:2, and a variety of absorbents with different components are obtained. Pure CO2 gas is used for absorption, and the CO2 flow rate is set at 60mL / min. Each absorbent absorbs at 40℃ for 2h. After the absorption is completed, the CO2 load of each absorbent is determined by the acid-base neutralization method. After comparison, MEA / TGDE / H2O is finally selected as the test absorbent. Subsequently, a large amount (1-2L) of test absorbent is reconfigured to absorb CO2 to 70%-90% of saturation for standby use.

[0058] (2) Modification of agglomerated fillers: First, a certain amount of orthophosphoric acid (85%) was diluted to 60% with deionized water, and then Al(OH)3 was added and stirred at 100℃ for 3h to prepare an AP adhesive. Then, 2g of the prepared AP adhesive was dissolved in 5mL of deionized water, referred to as solution A, and 1g of Al2O3 nanoparticles was dispersed in 15mL of anhydrous ethanol, referred to as solution B. Then, solutions A and B were mixed and ultrasonically treated for 10min to prepare a mixed solution C. At the same time, a stainless steel mesh (SSM) was ultrasonically cleaned several times in deionized water and anhydrous ethanol, then soaked in 2mol / L hydrochloric acid for 18-30h. After soaking, it was ultrasonically cleaned again and used as a substrate. Finally, the mixed solution C was dip-coated on the surface of a 316 stainless steel substrate. To achieve crosslinking and curing of the coating, the sample was continuously heat-treated at 120℃ for 2h and 240℃ for 1h to obtain a modified stainless steel mesh (MSSM), i.e., a substrate.

[0059] (3) Application of coalescing phase separator: Before the coalescing phase separator is operated, the coalescing net is placed in the coalescing phase separator section II (coalescing phase separation zone). The coalescing nets in this experiment include: polytetrafluoroethylene (PTFE), stainless steel mesh (SSM), and modified stainless steel mesh (MSSM). A blank is used as the control group. During operation, the unseparated mixed test absorbent is pumped into the phase separator feed port 1 by a liquid pump. The absorbent enters the phase separation buffer zone 5 of section I and the rich and poor liquids begin to separate gradually. Then it enters the coalescing phase separation zone 6 of section II and is separated again through coalescence. Finally, it reaches the gravity phase separation zone 7 of section III and is further separated through gravity, buoyancy, etc. Finally, the light phase flows out through the light phase outlet 4, and the heavy phase is pumped out from the heavy phase outlet 3 by a liquid pump, completing the liquid-liquid separation of the phase change absorbent. The residence time of the absorbent in the phase separator can be adjusted by the liquid pump. In this experiment, two residence times of 2.5 min and 5 min were tested respectively. The rich and poor liquids of each group of experiments were sampled. Measure the CO2 load, calculate the separation rate and compare the results.

[0060] The calculation formula of separation rate is:

[0061]

[0062] Figure 3 is the CO2 load and rich phase ratio of different components of absorbent, from Figure 3 It can be seen that the two-phase absorbent composed of MEA absorbent has a relatively high loading capacity, and the loading capacity of MEA / NHD / H2O and MEA / TGDE / H2O absorbents are both close to 5 mol / L. In terms of phase separation ratio, the rich phase accounts for 50% of the tested absorbents in most cases, among which the rich phase ratio of TETA / DMSO / H2O absorbent is slightly higher, while the rich phase component of TETA / NMP / H2O is slightly lower.

[0063] Figure 4 The effect of different CO2 loads of MEA / TGDE / H2O on the absorbent viscosity (the lean phase CO2 load is almost 0 and can be ignored. Figure 4 It can be seen that the viscosity of the lean phase at low loading is low and the variation range is small, basically maintained within 5mP·s, while the viscosity of the rich liquid gradually increases with the increase of CO2 loading. When it is close to full load (5mol / L), the viscosity of the rich phase is about 25mP·s.

[0064] Figure 5 The comparison chart of affinity between MSSM and SSM for absorbent lean and rich liquid is shown in Figure 2. Figure 5 It can be seen that the material before modification (SSM) is hydrophilic to both oil and water, and its hydrophobicity to both lean and rich liquids is improved (the contact angles increase at the same time); while the material after modification (MSSM) has obvious differences in hydrophilicity and hydrophobicity to oil and water, and lean and rich liquids.

[0065] Test Example 2: MEA / TMS / H2O Coalescing and Phase Separation Test

[0066] (1) Preparation of phase-change absorbent: The absorbent in this test example is used to capture CO2. A large amount (1-2 L) of MEA / TMS / H2O (mass ratio of 3:5:2) is prepared to absorb CO2 to 70%-90% of saturation for standby use.

[0067] (2) Same as step (2) in Test Example 1;

[0068] (3) Same as step (3) in Test Example 1.

[0069] The results showed that the absorbent loading was comparable to that in Test Example 1, approximately 5 mol / L; the rich phase accounted for approximately 50%.

[0070] In summary, the gas-liquid interface area in the horizontal phase separator of the present invention is large, and the gas-liquid movement directions are perpendicular to each other, which is conducive to the gas-liquid reaching phase equilibrium and better separation effect; the liquid level in the horizontal phase separator of the present invention is stable, and when the incoming liquid flow rate changes, the liquid level of the horizontal separator changes less, the buffering capacity is strong, and a stable flow rate can be provided for downstream equipment; coalescence separation technology is a method of liquid-liquid separation technology, which utilizes the properties of the material (surface characteristics, fiber structure) to enlarge small droplets of the dispersed phase, and under the action of gravity and other driving forces, the dispersed phase is removed from the continuous phase. A technology; the present invention adds AP adhesive-nano Al2O3 composite modified stainless steel mesh coalescing filler in the coalescing phase separator, which can effectively capture and coalesce tiny droplets, further improve the separation effect, and achieve comprehensive liquid-liquid separation.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A horizontal coalescing phase separator suitable for phase separation of rich and lean liquids of phase change absorbents, characterized in that: The invention comprises, in order along the direction of fluid flow, a phase separation buffer zone of section I, a coalescence phase separation zone of section II and a gravity phase separation zone of section III; the phase separation buffer zone of section I is provided with a tangential feed port (1) and a flow guide baffle; the coalescence phase separation zone of section II is filled with a stainless steel mesh coalescence filler (2) modified by AP adhesive-nano-Al2O3 composite; the gravity phase separation zone of section III is provided with a heavy phase outlet (3) and a light phase outlet (4).

2. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The length of the phase-splitting buffer zone of section I accounts for 20-25% of the total length of the phase splitter.

3. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The feed port (1) is connected to the absorption tower via a liquid pump.

4. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The heavy phase outlet (3) and the light phase outlet (4) are connected to the desorption tower and the absorption tower respectively through liquid pumps.

5. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The phase splitter is made of quartz glass, and its visible light transmittance is ≥90%.

6. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The preparation method of the agglomerated filler (2) comprises the following steps: S1. Prepare aluminum phosphate binder: dilute orthophosphoric acid with deionized water, add Al(OH)3 at a molar ratio of P / Al = 3:1, and stir at 100°C-120°C for a period of time; S2. Preparing a composite coating: dissolving the aluminum phosphate binder obtained in step S1 in deionized water, adding Al2O3 nanoparticles dispersed in anhydrous ethanol, and ultrasonically treating for a period of time to obtain an AP binder-nano-Al2O3 composite coating; S3. Base treatment: ultrasonically clean the stainless steel mesh in deionized water and anhydrous ethanol several times, then soak it in hydrochloric acid for a period of time, and then ultrasonically clean it again after soaking to prepare a substrate; S4, composite modification: dip-coating the composite coating obtained in step S2 on the substrate treated in step S3, and preparing AP adhesive-nano-Al2O3 composite modified stainless steel mesh agglomerated filler through step heat treatment.

7. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 6, characterized in that: The AP adhesive-nano-Al2O3 composite coating is used for phase separation of a phase-change absorber, and the difference in contact angle with organic amine is ≥104°, with the lean phase being 142°±3° and the rich phase being 38°±2°.

8. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 1, characterized in that: The phase-change absorbent is an organic amine-based ternary composite system, comprising the following components: 20-40 wt% of organic amine, 40-60 wt% of physical solvent and 15-25 wt% of water.

9. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 8, characterized in that: The organic amine is selected from at least one of monoethanolamine, tetraethylene pentamine, and triethylene tetramine; and the physical solvent is selected from at least one of polyethylene glycol dimethyl ether, triethylene glycol dimethyl ether, sulfolane, dimethyl sulfoxide, N-methyl pyrrolidone, and n-propanol.

10. The horizontal coalescing phase separator suitable for phase separation of rich and lean liquid of phase change absorbent according to claim 9, characterized in that: The organic amine-based ternary composite system is selected from any one of the following groups: (Ⅰ) monoethanolamine, triethylene glycol dimethyl ether and water; (II) Monoethanolamine, sulfolane and water.

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