Fischer-Tropsch product separation equipment and method

Abstract

The invention discloses Fischer-Tropsch product separation equipment and method, the Fischer-Tropsch product separation equipment comprises: a separator, the separator comprises at least one feed inlet, and a gas phase outlet, an oil phase outlet and a water phase outlet which are sequentially arranged from top to bottom; a material distributor, a coalescence structure and an adsorption structure are arranged in the separator, and the material distributor is arranged between the oil phase outlet and the water phase outlet; the coalescence structure is arranged between the material distributor and the water phase outlet; the adsorption structure is arranged between the material distributor and the oil phase outlet. The invention discloses Fischer-Tropsch product separation equipment and a Fischer-Tropsch product separation method, which are used for solving the problem that the existing Fischer-Tropsch product water phase and oil phase separation effect is not ideal.

Description

Technical Field

[0001] The present application relates to the technical field of Fischer-Tropsch synthesis, and more specifically, to a Fischer-Tropsch product separation device and method. Background Art

[0002] The Fischer-Tropsch reaction product flows out of the reactor and is initially separated into a water phase and an oil phase, and carries a certain amount of gas. The water phase is water and a small amount of oxygen-containing compounds and other organic matter, and the oil phase is organic matter containing alkanes, olefins and higher carbon number oxygen-containing compounds; the gas is a small amount of permanent gas such as H2, CO, CO2, CH4, etc. Due to the limited separation effect in the existing technology, water and some low-boiling-point organic matter are easily entrained in the gas phase, and incomplete separation will have a significant adverse effect on subsequent processes.

[0003] Therefore, a Fischer-Tropsch product separation device and method are needed to solve the above problems. Summary of the invention

[0004] In view of this, the purpose of the present application is to propose a Fischer-Tropsch product separation device and method to solve the problem of unsatisfactory separation of water phase and oil phase of existing Fischer-Tropsch products.

[0005] Based on the above purpose, the present application provides a Fischer-Tropsch product separation device, comprising:

[0006] A separator, the separator comprising at least one feed inlet and a gas phase outlet, an oil phase outlet and a water phase outlet arranged in sequence from top to bottom; a material distributor, a coalescing structure and an adsorption structure are arranged in the separator, the material distributor is arranged between the oil phase outlet and the water phase outlet; the coalescing structure is arranged between the material distributor and the water phase outlet; the adsorption structure is arranged between the material distributor and the oil phase outlet.

[0007] Optionally, the material distributor includes at least one guide pipe and at least one distribution pipe, the guide pipe is used to connect the feed port and the distribution pipe, and at least one water phase port and at least one oil phase port are respectively provided on opposite sides of the distribution pipe.

[0008] Optionally, there are a plurality of distribution tubes, and the plurality of distribution tubes are arranged in sequence from the inside to the outside along the extension direction of the guide tube, and the opening positions of adjacent distribution tubes are staggered.

[0009] Optionally, the adsorption structure comprises an oil absorption membrane and a breathable cover plate, wherein the oil absorption membrane is arranged between the material distributor and the oil phase outlet, and the breathable cover plate is placed on the oil absorption membrane.

[0010] Optionally, the adsorption structure further includes: an oil suction pump, the oil suction pump includes an oil suction end, and the oil suction end penetrates the oil phase outlet and contacts the oil absorption membrane.

[0011] Optionally, a support net is provided in the separator, and the support net is used to support the adsorption structure.

[0012] Optionally, at least one oil-blocking structure is provided between the water phase outlet and the coalescing structure.

[0013] Optionally, a flow guiding structure is provided between the oil-blocking structure and the adsorption structure.

[0014] Optionally, an oil-gas filtering structure is provided in the separator, and the oil-gas filtering structure is provided between the gas phase outlet and the oil phase outlet.

[0015] The present application also provides a Fischer-Tropsch product separation method, comprising:

[0016] (1) providing a mixed phase Fischer-Tropsch reaction product to a Fischer-Tropsch product separation device as described above;

[0017] (2) The mixed phase Fischer-Tropsch reaction product enters the material distributor from the feed inlet of the Fischer-Tropsch product separation equipment and is separated into water phase product, oil phase product and gas phase product. The water phase product is discharged from the separator from the water phase outlet through the coalescence structure, the oil phase product is discharged from the separator from the oil phase outlet through the adsorption structure, and the gas phase product is discharged from the separator from the gas phase outlet through the adsorption structure.

[0018] From the above, it can be seen that the Fischer-Tropsch product separation equipment and method provided in the present application have the following advantages compared with the prior art: by using the above-mentioned Fischer-Tropsch product separation equipment, the Fischer-Tropsch reaction products are separated into water phase products and oil phase products under the action of the separator, and the gas phase products entrained in the two phases are separated out at the same time, reducing the turbulence of the oil phase and the water phase, promoting gas-liquid separation, reducing mist entrainment, shortening the separation time of the oil phase and the water phase, effectively improving the purity of the three phases, improving the purity of the products in the subsequent processes, and improving the separation efficiency of each phase. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above-mentioned features and technical advantages of the present application will become clearer and easier to understand through the following description of its embodiments in conjunction with the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the Fischer-Tropsch product separation equipment used in the specific embodiments of the present application.

[0021] Figure 2 for Figure 1 A schematic diagram of a material distributor of a Fischer-Tropsch product separation device is shown.

[0022] The reference numerals are:

[0023] 1. Separator; 11. Feed inlet; 12. Gas phase outlet; 13. Oil phase outlet; 14. Water phase outlet; 2. Material distributor; 21. Guide pipe; 22. Distribution pipe; 3. Agglomeration structure; 4. Oil-blocking structure; 5. Support net; 6. Oil absorption membrane; 61. First oil absorption membrane; 62. Second oil absorption membrane; 7. Breathable cover plate; 71. First breathable cover plate; 72. Second breathable cover plate; 8. Oil and gas filtration structure; 9. Guide structure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. The same parts are represented by the same figure numerals. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings. The words "inside" and "outside" used refer to the direction toward or away from the geometric center of a specific component, respectively.

[0025] Figure 1 This is a schematic diagram of the Fischer-Tropsch product separation equipment used in the specific embodiments of the present application. Figure 2 for Figure 1 Schematic diagram of the material distributor of the Fischer-Tropsch product separation device shown. Figure 1 and Figure 2 As shown, the Fischer-Tropsch product separation device includes a separator 1.

[0026] The separator 1 includes at least one feed inlet 11 and a gas phase outlet 12, an oil phase outlet 13 and a water phase outlet 14 arranged in sequence from top to bottom; a material distributor 2, a coalescing structure 3 and an adsorption structure are arranged in the separator 1, the material distributor 2 is arranged between the oil phase outlet 13 and the water phase outlet 14; the coalescing structure 3 is arranged between the material distributor 2 and the water phase outlet 14; the adsorption structure is arranged between the material distributor 2 and the oil phase outlet 13.

[0027] The material distributor 2 can separate the mixed Fischer-Tropsch reaction products into gas phase products, water phase products and oil phase products. The coalescence structure 3 can gather the dispersed water phase products together, for example, gather the dispersed water droplets to form larger water droplets, and the water droplets sink under the action of gravity. The adsorption structure can gather the dispersed oil phase products together, for example, gather the dispersed oil droplets to form enlarged oil droplets, and the oil droplets float up under the action of buoyancy.

[0028] The Fischer-Tropsch reaction product flows out of the reactor in a mixed phase, and is initially separated into a gas phase and a wax phase before flowing into the Fischer-Tropsch product separation device, where water phase, oil phase, and gas phase separation are performed in the separator 1; specifically, the Fischer-Tropsch reaction product enters the material distributor 2 from the feed port 11, and the material distributor 2 is used to separate the gas phase product, the water phase product, and the oil phase product, especially to separate the water phase product and the oil phase product entrained by the gas phase product. The water phase product is heavier than the oil phase product, and the gas phase product is the lightest, that is, the water phase product sinks, and the oil phase product floats, floating on the water phase product, and the gas phase product moves up. Under the action of gravity, the water phase product moves down and is discharged from the separator 1 through the water phase outlet 14 through the coalescing structure 3; the water phase product can also be discharged from the water phase outlet 14 by a water pump. The oil phase product floats up and is discharged from the separator 1 through the adsorption structure through the oil phase outlet 13; the oil phase product can also be discharged from the oil phase outlet 13 by an oil suction pump. The gas phase product moves upward, continues to move toward the top through the adsorption structure, and is discharged from the separator 1 through the gas phase outlet 12; the gas phase product can also be discharged from the gas phase outlet 12 through a fan.

[0029] By adopting the above-mentioned Fischer-Tropsch product separation equipment, the Fischer-Tropsch reaction products are separated into water phase products and oil phase products under the action of the separator, and the gas phase products entrained in the two phases are separated out, thereby reducing the turbulence of the oil phase and the water phase, promoting gas-liquid separation, reducing mist entrainment, shortening the separation time of the oil phase and the water phase, effectively improving the purity of the three phases, improving the purity of the products in the subsequent processes, and improving the separation efficiency of each phase.

[0030] In one embodiment of the present application, the main body of the separator 1 is cylindrical, with an arc-shaped seal on the top and a conical seal on the bottom. The feed inlet 11 is usually provided in multiple, such as 2-4 feed inlets 11 evenly distributed along the circumferential direction on the main body of the separator 1. The gas phase outlet 12, the oil phase outlet 13 and the water phase outlet 14 are usually provided one each, and the gas phase product is a small amount of permanent gas such as H2, CO, CO2, CH4, etc.; the gas phase outlet 12 is provided at the top of the separator 1, such as the highest point of the arc-shaped seal, and the gas phase outlet 12 can be connected to the fan for extracting the gas phase product; the water phase outlet 14 is provided at the bottom of the separator 1, such as the lowest point of the conical seal, and the water phase product is water and organic substances such as oxygen-containing compounds; the water phase outlet 14 can be connected to a water pump for extracting the water phase product; the oil phase product is organic substances such as alkanes, olefins and oxygen-containing compounds with higher carbon numbers; the oil phase outlet 13 is provided in the middle and upper part of the main body of the separator 1, such as located relatively above the feed port 11, and the oil phase outlet 13 can be connected to an oil pump for extracting the oil phase product. From top to bottom in the separator 1 are the adsorption structure, the material distributor 2 and the coalescence structure 3, and the adsorption structure, the material distributor 2 and the coalescence structure 3 can be detachably connected in the separator 1.

[0031] In one embodiment of the present application, the aggregation structure 3 includes at least one aggregation layer, and the aggregation layer is made of treated glass fiber material.

[0032] Optionally, the material distributor 2 includes at least one flow guide pipe 21 and at least one distribution pipe 22. The flow guide pipe 21 is used to connect the feed port 11 and the distribution pipe 22. At least one water phase port and at least one oil phase port are respectively provided on opposite sides of the distribution pipe 22. The top of the distribution pipe 22 is provided with a plurality of oil phase ports sequentially spaced along the circumferential direction, and the oil phase port is used to output oil phase products and gas phase products; the bottom of the distribution pipe 22 is provided with a plurality of water phase ports sequentially spaced along the circumferential direction, and the water phase port is used to output water phase products. The total opening rate of the material distributor 2 is about 15%. The number of the flow guide pipes 21 is the same as the number of the feed ports 11. Each feed port 11 is connected to a flow guide pipe 21. Usually, the material distributor 2 includes two flow guide pipes 21, and the two flow guide pipes 21 simultaneously supply materials to each distribution pipe 22. In the distribution pipe 22, the water phase sinks, the gas phase and the oil phase float, the water phase flows out from the water phase port, and the gas phase and the oil phase flow out from the oil phase port. By adopting the above-mentioned material distributor 2, the number and opening rate of the material distribution pipes 22 can be flexibly adjusted, and the installation and disassembly are convenient. It can be flexibly configured and adjusted according to the separation difficulty and processing volume of the Fischer-Tropsch reaction products.

[0033] Optionally, there are multiple distribution pipes 22, and the multiple distribution pipes 22 are arranged in sequence from the inside to the outside along the extension direction of the guide pipe 21, and the opening positions of adjacent distribution pipes 22 are staggered. Each distribution pipe 22 is annular, and multiple distribution pipes 22 are nested in sequence in the shape of concentric circles. The distribution pipe 22 closer to the center has a smaller diameter, and the distribution pipe 22 closer to the edge has a larger diameter. The water phase port and / or oil phase port of the distribution pipe 22 located at an odd position from the outside to the inside is on the left, and the water phase port and / or oil phase port of the distribution pipe 22 located at an even position from the outside to the inside is on the right. Usually, the water phase port and the oil phase port of each distribution pipe 22 are staggered, such as the water phase port is located at the bottom end of the left side of the distribution pipe 22, and the oil phase port is located at the top end of the right side of the distribution pipe 22. The above-mentioned material distributor 2 has a sophisticated structure, which is conducive to gas-liquid separation and reduces mist entrainment.

[0034] In one embodiment of the present application, the guide pipes 21 on both sides maintain the same flow rate pressure and feed at the same time, and the guide pipe 21 on each side is connected to three distribution pipes 22, that is, the guide pipe 21 on the left side is connected to the distribution pipes 22 in odd positions from the outside to the inside, and the three distribution pipes 22 are arranged in concentric circles, with a diameter ratio of 1:1.2:1.5 from the inside to the outside, and a total number of openings from the inside to the outside of 1:2:3. The guide pipe 21 on the right side is connected to the distribution pipes 22 in even positions from the outside to the inside, and the three distribution pipes 22 are arranged in concentric circles, with a diameter ratio of 1:1.2:1.5 from the inside to the outside, and a total number of openings from the inside to the outside of 1:2:3.

[0035] Optionally, the adsorption structure includes an oil absorption membrane 6 and a breathable cover plate 7, the oil absorption membrane 6 is arranged between the material distributor 2 and the oil phase outlet 13, and the breathable cover plate 7 is placed on the oil absorption membrane. The oil absorption membrane 6 can absorb the oil phase product, and the oil absorption membrane 6 includes but is not limited to an oil absorption composite material layer, an oil absorption sponge layer, etc. The breathable cover plate 7 does not affect the passage of the gas phase product, and at the same time helps the oil phase product to be extracted. The breathable cover plate and the oil absorption membrane form a set, and usually 1-3 sets are set to improve the purity of the oil phase.

[0036] In one embodiment of the present application, the adsorption structure includes a first oil absorption membrane 61, a first breathable cover plate 71, a second oil absorption membrane 62, and a second breathable cover plate 72. The first oil absorption membrane 61 is placed above the material distributor 2, and the first breathable cover plate 71 is placed on the first oil absorption membrane 61. The first oil absorption membrane 61 and the first breathable cover plate 71 form a first set. The second oil absorption membrane 62 can be partially placed on the first oil absorption membrane 61, and the second breathable cover plate 72 is placed on the second oil absorption membrane 62. The second oil absorption membrane 62 and the second breathable cover plate 72 form a second set. The diameter ratio between the second set and the first set is 0.5:1. The height difference between the second breathable cover plate 72 and the first breathable cover plate 71 is ≥1cm.

[0037] Optionally, the adsorption structure further includes: an oil suction pump, the oil suction pump includes an oil suction end, and the oil suction end is provided with an oil phase outlet 13 to contact the oil absorption membrane. The oil suction pump extracts the oil phase product adsorbed by the oil absorption membrane through the oil suction end to discharge the oil phase product to the outside of the separator 1, and the oil absorption membrane can be recycled. By adding an oil suction pump, the separation driving force can be increased, and the separation effect and efficiency can be improved.

[0038] Optionally, a support net 5 is provided in the separator 1, and the support net 5 is used to support the adsorption structure. The support net 5 provides support for the adsorption structure.

[0039] In one embodiment of the present application, the support net 5 is a metal net, such as a 100-mesh metal net, which does not hinder the normal passage of the oil phase product. Usually, the number is set to one layer, and the number of layers can be increased according to the support requirements of the adsorption structure. The edge of the support net 5 is connected to the inner wall of the separator 1. The metal net has better support strength and longer service life.

[0040] Optionally, at least one oil-blocking structure 4 is provided between the water phase outlet 14 and the coalescing structure 3. The oil-blocking structure 4 is used to intercept the oil phase product, and the water phase product can pass through the oil-blocking structure 4, while the oil phase product cannot pass through the oil-blocking structure 4. By providing the oil-blocking structure 4, once the water phase product carries the oil phase product out of the material distributor 2, the water phase product passes through the oil-blocking structure 4, while the oil phase product cannot pass through the oil-blocking structure 4. This ensures that only the water phase product passes through the water phase outlet 14, which helps to achieve efficient separation of water and oil.

[0041] In one embodiment of the present application, the oil-blocking structure 4 includes but is not limited to an oil-blocking membrane, which is made of ultrafiltration / nanofiltration membrane material. Usually, the oil-blocking membrane is set to multiple channels, such as 2 channels, and the multiple oil-blocking membranes are arranged at intervals between the material distributor 2 and the water phase outlet 14. By increasing the number of oil-blocking membranes, the oil-water separation efficiency can be improved.

[0042] In one embodiment of the present application, the oil-blocking film is arranged relatively above the water phase outlet 14, and the cover is arranged outside the water phase outlet 14. The oil-blocking film is conical, the tip of the oil-blocking film points to the water phase outlet 14, and the edge of the oil-blocking film is connected to the inner wall of the separator 1. The water phase gathers toward the tip due to gravity and continuously passes through, while the oil phase floats above the water phase and gathers toward the edge.

[0043] Optionally, a flow guiding structure 9 is provided between the oil blocking structure 4 and the adsorption structure. The flow guiding structure 9 is provided on the inner wall of the separator 1, one end of the flow guiding structure 9 is in contact with the oil blocking structure 4, and the other end of the flow guiding structure 9 is in contact with the adsorption structure. The flow guiding structure 9 is used to guide the oil phase product intercepted by the oil blocking structure 4 into the adsorption structure through the flow guiding structure 9. Under the action of the flow guiding structure 9, the oil phase product converges to one side of the adsorption structure, and the oil phase is timely diverted to avoid residue on the oil blocking film or the inner wall.

[0044] In one embodiment of the present application, the guide structure 9 includes but is not limited to an oil absorption membrane, which includes but is not limited to an oil absorption material layer. The oil absorption membrane is arranged between the oil-blocking structure 4 and the adsorption structure, and is connected to the inner wall of the separator 1. The residual oil droplets intercepted by the oil absorption membrane are gradually gathered and transported to the adsorption structure.

[0045] Optionally, an oil-gas filtering structure 8 is provided in the separator 1, and the oil-gas filtering structure 8 is provided between the gas phase outlet 12 and the oil phase outlet 13. The oil-gas filtering structure 8 (such as an oil-gas filter) is provided on the necessary path for the gas phase product to be discharged, and the gas phase product passes through the oil-gas filtering structure 8 when moving upward. Once the gas phase product carries the oil phase product, the oil-gas filtering structure 8 separates the two, and the filtered gas phase product is discharged from the gas phase outlet 12, and the retained oil phase product is discharged from the oil phase outlet 13. By providing the oil-gas filtering structure 8, the gas phase product and the oil phase product have higher purity.

[0046] The following further introduces the use process of the Fischer-Tropsch product separation equipment.

[0047] The Fischer-Tropsch reaction product enters the material distributor 2 from the feed port 11. The Fischer-Tropsch reaction product feed can be pressurized by a pump to increase the driving force for the separation of the oil-water two-phase, thereby increasing the permeation flux and improving the separation efficiency. The material distributor 2 is used to separate the gas phase product, the water phase product and the oil phase product, especially to separate the water phase product and the oil phase product entrained by the gas phase product. The water phase product is heavier than the oil phase product, and the gas phase product is the lightest, that is, the water phase product sinks, and the oil phase product floats, floating on the water phase product, and the gas phase product moves up. Under the action of gravity, the water phase product moves downward, aggregates into a larger water mass through the coalescence structure 3, and is discharged from the separator 1 from the water phase outlet 14 through the oil blocking structure 4; and the diversion structure 9 diverts the residual oil intercepted by the oil blocking structure 4 to the adsorption structure. The oil phase product floats up, passes through the support net 5, is gathered by the adsorption structure, and is discharged from the separator 1 from the oil phase outlet 13 through the oil suction pump; the gas phase product moves upward, continues to move to the top through the adsorption structure, and the gas phase product filtered by the oil and gas filtering structure is discharged from the gas phase outlet 12, and the retained oil phase product is discharged from the oil phase outlet 13.

[0048] The following is a description of the use of the Fischer-Tropsch product separation device in conjunction with a specific embodiment (see Table 1).

[0049] Table 1 Comparison of product pre-separation system effects

[0050] Comparative Example Example 1 Example 2 Example 3 Fischer-Tropsch reaction product pump Not set Not set Not set set up Oil absorption film (layer) of adsorption structure Not set 1 1 2 Oil-blocking structure (layer) Not set 1 2 2 Material distributor pipe (pieces) Not set 2 4 4 System temperature (℃) 35～50 normal temperature normal temperature normal temperature System pressure(MPa) 0.1-0.4 Normal pressure Normal pressure Normal pressure Liquid content in gas phase (mg / L) 50～120 40～90 35～60 20～45 Oil content in water phase (mg / L) 80～100 10～60 0～30 0～25 Water content in oil phase (mg / L) 0～50 0～30 0～20 0～15

[0051] In the comparative example, in the separator 1 which is not equipped with the Fischer-Tropsch reaction product pump, the adsorption structure, the oil-blocking structure 4 and the material distributor 2, the system temperature is set to 35-50°C and the system pressure is set to 0.1-0.4MPa by heating and pressurizing, and the Fischer-Tropsch reaction product enters the reactor, and the separation effect of gas, liquid and oil three phases is the worst, the gas phase liquid content is 50-120mg / L, the water phase oil content is 80-100mg / L, and the oil phase water content is 0-50mg / L.

[0052] In Example 1, in the separator 11 where the Fischer-Tropsch reaction product pump is not provided, a layer of oil absorption membrane is added as an adsorption structure, an oil-blocking structure 4 is added, and a material distributor 2 with two distribution pipes is added. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is relatively improved. The liquid content of the gas phase is 40-90 mg / L, and the upper limit is reduced by 30 mg / L and the lower limit is reduced by 10 mg / L relative to the comparative example. The oil content of the water phase is 10-60 mg / L, and the upper limit is reduced by 40 mg / L and the lower limit is reduced by 70 mg / L relative to the comparative example. The water content of the oil phase is 0-30 mg / L, and the upper limit is reduced by 20 mg / L relative to the comparative example.

[0053] In Example 2, on the basis of Example 1, an additional layer of oil-blocking structure 4 is provided, and two additional distribution pipes are provided; that is, Example 2 has one layer of oil-absorbing membrane as an adsorption structure, two layers of oil-blocking structure 4, and a material distributor 2 with four distribution pipes. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is further improved. The gas phase liquid content is 35-60 mg / L, and the upper limit is reduced by 60 mg / L and the lower limit is reduced by 15 mg / L relative to the comparative example; the upper limit is reduced by 30 mg / L and the lower limit is reduced by 5 mg / L relative to Example 1; the water phase oil content is 0-30 mg / L, and the upper limit is reduced by 70 mg / L and the lower limit is reduced by 80 mg / L relative to the comparative example; the upper limit is reduced by 30 mg / L and the lower limit is reduced by 10 mg / L relative to Example 1; the oil content of the oil phase is 0-20 mg / L, and the upper limit is reduced by 30 mg / L relative to the comparative example; the upper limit is reduced by 10 mg / L relative to Example 1.

[0054] In Example 3, on the basis of Example 2, a Fischer-Tropsch reaction product pump is additionally provided, and an oil absorption membrane is additionally provided as an adsorption structure; on the basis of Example 1, a Fischer-Tropsch reaction product pump is additionally provided, and an oil absorption membrane is additionally provided as an adsorption structure, an oil-blocking structure 4 is additionally provided, and two distribution pipes are additionally provided; that is, Example 3 has a Fischer-Tropsch reaction product pump, two layers of oil absorption membranes as adsorption structures, two layers of oil-blocking structures 4, and a material distributor 2 with four distribution pipes. At normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is the best. The liquid content in the gas phase is 20 to 45 mg / L. Relative to the comparative example, the upper limit is reduced by 75 mg / L, and the lower limit is reduced by 30mg / L lower; relative to Example 1, the upper limit is reduced by 45mg / L, and the lower limit is reduced by 20mg / L; relative to Example 2, the upper limit is reduced by 15mg / L, and the lower limit is reduced by 15mg / L; the oil content of the water phase is 0-25mg / L, relative to the comparative example, the upper limit is reduced by 75mg / L, and the lower limit is reduced by 80mg / L; relative to Example 1, the upper limit is reduced by 35mg / L, and the lower limit is reduced by 10mg / L; relative to Example 2, the upper limit is reduced by 5mg / L; the water content of the oil phase is 0-15mg / L, relative to the comparative example, the upper limit is reduced by 35mg / L; relative to Example 1, the upper limit is reduced by 15mg / L; relative to Example 2, the upper limit is reduced by 5mg / L.

[0055] The present application also provides a Fischer-Tropsch product separation method, comprising:

[0056] (1) Providing a mixed phase of Fischer-Tropsch reaction products to a Fischer-Tropsch product separation device as described above; the Fischer-Tropsch product separation method may use any of the Fischer-Tropsch product separation devices described above.

[0057] (2) The mixed phase Fischer-Tropsch reaction product enters the material distributor 2 from the feed inlet 11 of the Fischer-Tropsch product separation equipment and is separated into water phase product, oil phase product and gas phase product. The water phase product is discharged from the separator 1 from the water phase outlet 14 through the coalescence structure 3, the oil phase product is discharged from the separator 1 from the oil phase outlet 13 through the adsorption structure, and the gas phase product is discharged from the separator 1 from the gas phase outlet 12 through the adsorption structure.

[0058] The Fischer-Tropsch reaction product enters the material distributor 2 from the feed port 11. The material distributor 2 is used to separate the gas phase product, the water phase product and the oil phase product, especially to separate the water phase product and the oil phase product entrained by the gas phase product. The water phase product is heavier than the oil phase product, and the gas phase product is the lightest, that is, the water phase product sinks, the oil phase product floats, floats on the water phase product, and the gas phase product moves up. Under the action of gravity, the water phase product moves down, gathers into a larger water mass through the coalescence structure 3, and is discharged from the separator 1 through the water phase outlet 14 through the oil blocking structure 4; and the diversion structure 9 diverts the residual oil intercepted by the oil blocking structure 4 to the adsorption structure. The oil phase product floats up, passes through the support net 5, gathers through the adsorption structure, and is discharged from the separator 1 through the oil phase outlet 13 through the oil suction pump; the gas phase product moves up, continues to move to the top through the adsorption structure, and the gas phase product filtered by the oil and gas filtration structure is discharged from the gas phase outlet 12, and the intercepted oil phase product is discharged from the oil phase outlet 13.

[0059] By adopting the above-mentioned Fischer-Tropsch product separation method, the Fischer-Tropsch reaction products are separated into water phase products and oil phase products under the action of a separator, and the gas phase products entrained in the two phases are separated out at the same time, thereby reducing the turbulence of the oil phase and the water phase, promoting gas-liquid separation, reducing mist entrainment, shortening the separation time of the oil phase and the water phase, effectively improving the purity of the three phases, improving the purity of the products in the subsequent process, and improving the separation efficiency of each phase.

[0060] From the above description and practice, it can be seen that the Fischer-Tropsch product separation equipment and method provided in the present application have the following advantages compared with the prior art: by using the above-mentioned Fischer-Tropsch product separation equipment, the Fischer-Tropsch reaction products are separated into water phase products and oil phase products under the action of the separator, and the gas phase products entrained in the two phases are separated out at the same time, reducing the turbulence of the oil phase and the water phase, promoting gas-liquid separation, reducing mist entrainment, shortening the separation time of the oil phase and the water phase, effectively improving the purity of the three phases, improving the purity of the products of the subsequent processes, and improving the separation efficiency of each phase.

[0061] A person skilled in the art should understand that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A Fischer-Tropsch product separation device, characterized in that: include: A separator, the separator comprising at least one feed inlet and a gas phase outlet, an oil phase outlet and a water phase outlet arranged in sequence from top to bottom; The separator is provided with a material distributor, a coalescing structure and an adsorption structure. The material distributor is arranged between the oil phase outlet and the water phase outlet; the coalescing structure is arranged between the material distributor and the water phase outlet; and the adsorption structure is arranged between the material distributor and the oil phase outlet.

2. The Fischer-Tropsch product separation device according to claim 1, characterized in that: The material distributor includes at least one guide pipe and at least one distribution pipe. The guide pipe is used to connect the feed port and the distribution pipe. At least one water phase port and at least one oil phase port are respectively arranged on opposite sides of the distribution pipe.

3. The Fischer-Tropsch product separation device according to claim 2, characterized in that: There are multiple distribution pipes, and the multiple distribution pipes are arranged in sequence from the inside to the outside along the extension direction of the guide pipe, and the opening positions of adjacent distribution pipes are staggered.

4. The Fischer-Tropsch product separation device according to any one of claims 1 to 3, characterized in that: The adsorption structure comprises an oil absorption membrane and a breathable cover plate. The oil absorption membrane is arranged between the material distributor and the oil phase outlet, and the breathable cover plate is placed on the oil absorption membrane.

5. The Fischer-Tropsch product separation device according to claim 4, characterized in that: The adsorption structure further includes: an oil suction pump, wherein the oil suction pump includes an oil suction end, and the oil suction end penetrates the oil phase outlet and contacts the oil absorption membrane.

6. The Fischer-Tropsch product separation device according to any one of claims 1 to 3, characterized in that: A support net is arranged in the separator, and the support net is used to support the adsorption structure.

7. The Fischer-Tropsch product separation device according to any one of claims 1 to 3, characterized in that: At least one oil-blocking structure is disposed between the water phase outlet and the coalescing structure.

8. The Fischer-Tropsch product separation device according to claim 7, characterized in that: A flow guiding structure is arranged between the oil-blocking structure and the adsorption structure.

9. The Fischer-Tropsch product separation device according to any one of claims 1 to 3, characterized in that: An oil-gas filtering structure is arranged in the separator, and the oil-gas filtering structure is arranged between the gas phase outlet and the oil phase outlet.

10. A method for separating Fischer-Tropsch products, characterized in that: include: (1) providing a mixed phase Fischer-Tropsch reaction product to a Fischer-Tropsch product separation device as claimed in any one of claims 1 to 9; (2) The mixed phase Fischer-Tropsch reaction product enters the material distributor from the feed inlet of the Fischer-Tropsch product separation equipment and is separated into water phase product, oil phase product and gas phase product. The water phase product is discharged from the separator from the water phase outlet through the coalescence structure, the oil phase product is discharged from the separator from the oil phase outlet through the adsorption structure, and the gas phase product is discharged from the separator from the gas phase outlet through the adsorption structure.

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