Fischer-tropsch product separation apparatus and method

Abstract

The application discloses a Fischer-Tropsch product separation device and method, and belongs to the field of Fischer-Tropsch product separation. The Fischer-Tropsch product separation device comprises a separator, wherein the separator comprises 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 coalescence 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 coalescence 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. The application discloses a Fischer-Tropsch product separation device and method, and solves the problem that the separation effect of the water phase and the oil phase of the existing Fischer-Tropsch product is not ideal.

Description

TECHNICAL FIELD

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

[0002] The Fischer-Tropsch reaction product flows out of the reactor, is preliminarily 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 organic matter such as oxygen-containing compounds, and the oil phase is organic matter such as alkanes, alkenes and higher carbon number oxygen-containing compounds; the gas is a small amount of permanent gas such as H2, CO, CO2 and CH4. Due to the limited separation effect in the prior art, water and part of the lower boiling point organic matter are easily entrained in the gas phase, and incomplete separation will have a great adverse effect on the subsequent process.

[0003] Therefore, there is a need for a Fischer-Tropsch product separation device and method to solve the above problems. SUMMARY

[0004] Therefore, the present application aims to provide a Fischer-Tropsch product separation device and method to solve the problem of unsatisfactory separation effect of the water phase and the oil phase of the Fischer-Tropsch product.

[0005] To achieve the above purpose, the present application provides a Fischer-Tropsch product separation device, which comprises:

[0006] A separator, comprising at least one feed inlet and, from top to bottom, a gas phase outlet, an oil phase outlet and a water phase outlet; a material distributor, a coalescence 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 coalescence 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.

[0007] Optionally, the material distributor comprises at least one flow guide pipe and at least one distribution pipe, the flow guide pipe is used to communicate the feed inlet and the distribution pipe, and at least one water phase port and at least one oil phase port are arranged on opposite sides of the distribution pipe.

[0008] Optionally, the number of the distribution pipes is multiple, and the multiple distribution pipes are arranged in sequence along the extension direction of the flow guide pipe from inside to outside, and the opening positions of adjacent distribution pipes are staggered.

[0009] Optionally, the adsorption structure comprises an oil absorption film and a gas permeable cover plate, the oil absorption film is arranged between the material distributor and the oil phase outlet, and the gas permeable cover plate is arranged on the oil absorption film.

[0010] Optionally, the adsorption structure further comprises an oil absorption pump, the oil absorption pump comprises an oil absorption end, and the oil absorption end is in contact with the oil absorption film through the oil phase outlet.

[0011] Optionally, a support net is arranged in the separator, and the support net is used for supporting the adsorption structure.

[0012] Optionally, at least one oil blocking structure is arranged between the water phase outlet and the coalescence structure.

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

[0014] Optionally, 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.

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

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

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

[0018] As can be seen from the above, the Fischer-Tropsch product separation device and method provided by the application have the following advantages compared with the prior art: by using the Fischer-Tropsch product separation device, the Fischer-Tropsch reaction product is separated into a water phase product and an oil phase product under the action of the separator, and the gas phase product entrained in the two phases is separated out, the turbulent flow of the oil phase and the water phase is reduced, the gas-liquid separation is promoted, the entrainment of mist is reduced, the separation time of the oil phase and the water phase is shortened, the purity of the three phases is effectively improved, the purity of the product in the subsequent process is improved, and the separation efficiency of each phase is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above features and technical advantages of the application will become more apparent and easily understood from the following description of its embodiments, taken in conjunction with the accompanying drawings.

[0020] Figure 1 FIG. 1 is a schematic diagram of a Fischer-Tropsch product separation device used in the embodiments of the application.

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

[0022] In the drawings:

[0023] ​1 separator; 11 feed inlet; 12 gas phase outlet; 13 oil phase outlet; 14 water phase outlet; 2 material distributor; 21 flow guide pipe; 22 distribution pipe; 3 coalescence structure; 4 oil blocking structure; 5 support net; 6 oil absorption film; 61 first oil absorption film; 62 second oil absorption film; 7 gas permeable cover plate; 71 first gas permeable cover plate; 72 second gas permeable cover plate; 8 oil gas filtering structure; 9 flow guide structure. DETAILED DESCRIPTION

[0024] For the purpose of making the present application more clearly, the technical solutions and advantages thereof, the present application is further described in detail below with reference to specific embodiments and with reference to the drawings. Identical parts are denoted by identical reference numerals in the following description. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings. The words "inner" and "outer" are used to refer to the directions towards or away from the geometric center of a particular part.

[0025] Figure 1 A schematic diagram of a Fischer-Tropsch product separation apparatus employed in the specific embodiments of the present application. Figure 2 A schematic diagram of a material distributor of a Fischer-Tropsch product separation apparatus is shown in Fig. 2. Figure 1 A schematic diagram of a Fischer-Tropsch product separation apparatus is shown in Fig. 1. Figure 1 A schematic diagram of a Fischer-Tropsch product separation apparatus is shown in Fig. 1. Figure 2 A schematic diagram of a Fischer-Tropsch product separation apparatus is shown in Fig. 1.

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

[0027] The material distributor 2 is capable of separating the mixed Fischer-Tropsch reaction products into gas phase products, water phase products and oil phase products. The coalescence structure 3 is capable of coalescing the dispersed water phase products, for example, coalescing the dispersed water droplets to form larger water beads, which sink under the action of gravity. The adsorption structure is capable of coalescing the dispersed oil phase products, for example, coalescing the dispersed oil droplets to form larger oil beads, which float under the action of buoyancy.

[0028] The Fischer-Tropsch reaction product is in a mixed phase when it flows out of the reactor, is preliminarily separated into a gas phase and a wax phase, and then flows into a Fischer-Tropsch product separation device, and water phase, oil phase and gas phase separation is performed in the separator 1. Specifically, the Fischer-Tropsch reaction product enters the material distributor 2 from the feed inlet 11, the material distributor 2 is used to separate out the gas phase product, the water phase product and the oil phase product, and in particular to separate out the gas phase product entrained with the water phase product and the oil phase product. The water phase product is heavier than the oil phase product, and the gas phase product is the lightest, i.e. the water phase product sinks, the oil phase product floats on the water phase product, and the gas phase product moves upwards. Under the action of gravity, the water phase product moves downwards and is discharged from the water phase outlet 14 of the separator 1 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 upwards and is discharged from the oil phase outlet 13 of the separator 1 through the adsorption structure; the oil phase product can also be discharged from the oil phase outlet 13 by an oil pump. The gas phase product moves upwards and continues to move to the top through the adsorption structure and is discharged from the gas phase outlet 12 of the separator 1; the gas phase product can also be discharged from the gas phase outlet 12 by a fan.

[0029] By using the above Fischer-Tropsch product separation device, the Fischer-Tropsch reaction product is separated into a water phase product and an oil phase product under the action of the separator, and the two phases are separated from the gas phase product entrained therein, the turbulent flow of the oil phase and the water phase is reduced, the gas-liquid separation is promoted, the entrainment of mist is reduced, the separation time of the oil phase and the water phase is shortened, the purity of the three phases is effectively improved, the purity of the product in the subsequent process is improved, and the separation efficiency of each phase is improved.

[0030] In an embodiment of the present application, the main body of the separator 1 is in a cylindrical shape, the upper part thereof is in a circular arc shape, and the lower part thereof is in a conical shape. The feed inlet 11 is usually provided as a plurality of feed inlets 11, e.g. 2-4 feed inlets 11 are uniformly distributed along the circumferential direction on the main body of the separator 1. One gas phase outlet 12, one oil phase outlet 13 and one water phase outlet 14 are usually provided, the gas phase product is a small amount of permanent gas such as H2, CO, CO2 and CH4, the gas phase outlet 12 is provided at the top of the separator 1, e.g. at the highest part of the circular arc shape, and the gas phase outlet 12 can be communicated with a fan for extracting the gas phase product; the water phase product is water and organic matter such as oxygen-containing compounds, the water phase outlet 14 is provided at the bottom of the separator 1, e.g. at the lowest part of the conical shape, and the water phase outlet 14 can be communicated with a water pump for extracting the water phase product; the oil phase product is organic matter such as alkanes, alkenes and higher carbon number oxygen-containing compounds, and the oil phase outlet 13 is provided in the middle and upper part of the main body of the separator 1, e.g. above the feed inlets 11, and the oil phase outlet 13 can be communicated with an oil pump for extracting the oil phase product. The separator 1 has, from top to bottom, the adsorption structure, the material distributor 2 and the coalescing structure 3, and the adsorption structure, the material distributor 2 and the coalescing structure 3 can be detachably connected in the separator 1.

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

[0032] Optionally, the material distributor 2 comprises at least one flow guide pipe 21 and at least one distribution pipe 22, the flow guide pipe 21 is used to communicate the feed inlet 11 and the distribution pipe 22, and the distribution pipe 22 is provided with at least one water phase port and at least one oil phase port on opposite sides. The top end of the distribution pipe 22 is provided with a plurality of oil phase ports arranged in sequence and spaced along the circumferential direction, which are used to output the oil phase product and the gas phase product; the bottom end of the distribution pipe 22 is provided with a plurality of water phase ports arranged in sequence and spaced along the circumferential direction, which are used to output the water phase product. The total opening rate of the material distributor 2 is about 15%. The number of flow guide pipes 21 is the same as the number of feed inlets 11, and one flow guide pipe 21 is connected at each feed inlet 11. Usually, the material distributor 2 comprises two flow guide pipes 21, and the two flow guide pipes 21 simultaneously supply each distribution pipe 22. In the distribution pipe 22, the water phase sinks, and the gas phase and the oil phase float, the water phase flows out through the water phase port, and the gas phase and the oil phase flow out through the oil phase port. By using the above-mentioned material distributor 2, the number and opening rate of the distribution pipe 22 can be flexibly adjusted, and the installation and disassembly are convenient. The separation difficulty and the processing capacity of the Fischer-Tropsch reaction product can be flexibly configured and adjusted.

[0033] Optionally, the number of distribution pipes 22 is multiple, and the multiple distribution pipes 22 are arranged in sequence and spaced from inside to outside along the extension direction of the flow guide pipe 21, and the opening positions of adjacent distribution pipes 22 are staggered. Each distribution pipe 22 is in the form of a circular ring, and the multiple distribution pipes 22 are sequentially nested and arranged in the form of concentric circles, the closer to the center, the smaller the diameter of the distribution pipe 22, and the closer to the edge, the larger the diameter of the distribution pipe 22. The water phase port and / or the oil phase port of the distribution pipe 22 located at the odd position from outside to inside is on the left side, and the water phase port and / or the oil phase port of the distribution pipe 22 located at the even position from outside to inside is on the right side. Usually, the water phase port and the oil phase port of each distribution pipe 22 are distributed staggeredly, for example, 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. By using the above-mentioned material distributor 2, the structure is exquisite, which is helpful for gas-liquid separation and reduces entrainment.

[0034] In an embodiment of the present application, the flow guide pipes 21 on both sides keep the same flow pressure while feeding, and each flow guide pipe 21 communicates with three distribution pipes 22, that is, the flow guide pipe 21 on the left side communicates with the distribution pipes 22 located at the odd positions from outside to inside, and the three distribution pipes 22 are arranged in the form of concentric circles, and the diameter ratio from inside to outside is 1:1.2:1.5, and the total opening number from inside to outside is 1:2:3. The flow guide pipe 21 on the right side communicates with the distribution pipes 22 located at the even positions from outside to inside, and the three distribution pipes 22 are arranged in the form of concentric circles, and the diameter ratio from inside to outside is 1:1.2:1.5, and the total opening number from inside to outside is 1:2:3.

[0035] Optionally, the adsorption structure comprises an oil absorption film 6 and a gas permeable cover plate 7, the oil absorption film 6 is arranged between the material distributor 2 and the oil phase outlet 13, and the gas permeable cover plate 7 is arranged on the oil absorption film. The oil absorption film 6 can absorb the oil phase product, and the oil absorption film 6 comprises but is not limited to an oil absorption composite material layer, an oil absorption sponge layer and the like, and the gas permeable cover plate 7 does not affect the passing of the gas phase product, and helps the oil phase product to be extracted. The gas permeable cover plate and the oil absorption film form a set, and generally 1-3 sets are arranged to improve the purity of the oil phase.

[0036] In an embodiment of the present application, the adsorption structure comprises a first oil absorption film 61, a first gas permeable cover plate 71, a second oil absorption film 62 and a second gas permeable cover plate 72, the first oil absorption film 61 is arranged above the material distributor 2, the first gas permeable cover plate 71 is arranged on the first oil absorption film 61, the first oil absorption film 61 and the first gas permeable cover plate 71 form a first set, the second oil absorption film 62 can be arranged on the first oil absorption film 61 in a partial manner, the second gas permeable cover plate 72 is arranged on the second oil absorption film 62, and the second oil absorption film 62 and the second gas permeable cover plate 72 form a second set. The diameter ratio of the second set to the first set is 0.5:1. The height difference between the second gas permeable cover plate 72 and the first gas permeable cover plate 71 is greater than or equal to 1 cm.

[0037] Optionally, the adsorption structure further comprises an oil absorption pump, the oil absorption pump comprises an oil absorption end, and the oil absorption end is arranged in contact with the oil absorption film through the oil phase outlet 13. The oil absorption pump extracts the oil phase product absorbed by the oil absorption film through the oil absorption end to discharge the oil phase product out of the separator 1, and the oil absorption film can be recycled. By additionally arranging the oil absorption pump, the separation driving force can be improved, and the separation effect and efficiency can be improved.

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

[0039] In an 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 passing of the oil phase product. Generally, one layer is arranged, and the number of layers can be increased according to the support needs 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 supporting strength and longer service life.

[0040] Optionally, at least one oil blocking structure 4 is arranged between the water phase outlet 14 and the coalescence structure 3. The oil blocking structure 4 is used for intercepting 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 arranging the oil blocking structure 4, once the water phase product carrying the oil phase product flows 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. Thus, only the water phase product passes through the water phase outlet 14, which helps to realize efficient separation of water and oil.

[0041] In an embodiment of the present application, the oil blocking structure 4 includes but is not limited to an oil blocking membrane made of ultrafiltration / nanofiltration membrane material. The oil blocking membrane is usually arranged in multiple rows, such as two rows, and is arranged 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 an embodiment of the present application, the oil blocking membrane is arranged above the water phase outlet 14 and covers the outside of the water phase outlet 14. The oil blocking membrane is conical, with the tip of the oil blocking membrane pointing towards the water phase outlet 14, and the edge of the oil blocking membrane connected to the inner wall of the separator 1. The water phase converges towards the tip due to gravity and continuously passes through, while the oil phase floats above the water phase and converges towards the edge.

[0043] Optionally, a flow guide structure 9 is arranged between the oil blocking structure 4 and the adsorption structure. The flow guide structure 9 is arranged on the inner wall of the separator 1, one end of the flow guide structure 9 is in contact with the oil blocking structure 4, and the other end of the flow guide structure 9 is in contact with the adsorption structure. The flow guide structure 9 is used to guide the oil phase product trapped by the oil blocking structure 4 to enter the adsorption structure through the flow guide structure 9. Under the action of the flow guide structure 9, the oil phase product converges to one side of the adsorption structure, and the oil phase is timely drained to avoid residual oil on the oil blocking membrane or the inner wall.

[0044] In an embodiment of the present application, the flow 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 trapped by the oil absorption membrane gradually converge and are transported to the adsorption structure.

[0045] Optionally, an oil and gas filter structure 8 is arranged in the separator 1, and the oil and gas filter structure 8 is arranged between the gas phase outlet 12 and the oil phase outlet 13. The oil and gas filter structure 8 (such as an oil and gas filter) is arranged on the path that the gas phase product must pass through when moving upwards. The oil and gas filter structure 8 separates the gas phase product and the oil phase product once the gas phase product carries the oil phase product. The filtered gas phase product is discharged from the gas phase outlet 12, and the trapped oil phase product is discharged from the oil phase outlet 13. By arranging the oil and gas filter structure 8, the purity of the gas phase product and the oil phase product can be improved.

[0046] The use process of the Fischer-Tropsch product separation equipment is further introduced below.

[0047] Fischer-Tropsch reaction product from the feed port 11 into the material distributor 2, Fischer-Tropsch reaction product feed can be pressurized by a pump, increase the driving force of oil and water two-phase separation, improve the permeation flux, improve the separation efficiency; material distributor 2 is used to separate gas phase product, water phase product and oil phase product, especially to separate the water phase product and 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 on the water phase product, and the gas phase product moves upward. Under the action of gravity, the water phase product moves downward, and is gathered into a larger water group through the coalescence structure 3, and is discharged from the water phase outlet 14 of the separator 1 through the oil blocking structure 4. The residual oil intercepted by the flow guide structure 9 is guided to the adsorption structure. The oil phase product floats upward, passes through the supporting net 5, is gathered through the adsorption structure, and is discharged from the oil phase outlet 13 of the separator 1 through the oil pump. The gas phase product moves upward, continues to move to the top through the adsorption structure, and the gas phase product filtered through the oil-gas filtering structure is discharged from the gas phase outlet 12, and the intercepted oil phase product is discharged from the oil phase outlet 13.

[0048] The use process of the Fischer-Tropsch product separation device will be described below in combination with specific examples (see Table 1).

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

[0050]

[0051] In the comparative example, in the separator 1 without setting 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℃ by heating and pressurizing, the system pressure is set to 0.1-0.4MPa, the Fischer-Tropsch reaction product enters the reactor, and the gas, liquid and oil three-phase separation effect is the worst, the liquid content in the gas phase is 50-120mg / L, the oil content in the water phase is 80-100mg / L, and the water content in the oil phase is 0-50mg / L.

[0052] In example 1, in the separator 1 without setting the Fischer-Tropsch reaction product pump, one layer of oil absorption film is added as the adsorption structure, one layer of oil blocking structure 4 is added, and a material distributor 2 with two distribution pipes is added. Under 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 in the gas phase is 40-90mg / L, the upper limit is reduced by 30mg / L and the lower limit is reduced by 10mg / L compared with the comparative example, the oil content in the water phase is 10-60mg / L, the upper limit is reduced by 40mg / L and the lower limit is reduced by 70mg / L compared with the comparative example, and the water content in the oil phase is 0-30mg / L, the upper limit is reduced by 20mg / L compared with the comparative example.

[0053] In Example 2, on the basis of Example 1, 1 layer of oil blocking structure 4 is added, and 2 cloth pipes are added; that is, Example 2 has 1 layer of oil absorption film as the adsorption structure, has 2 layers of oil blocking structure 4, and has 4 cloth pipe material distributors 2; under normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas-liquid-oil three-phase separation effect is further improved; the gas phase contains 35-60 mg / L of liquid, the upper limit is reduced by 60 mg / L and the lower limit is reduced by 15 mg / L compared with the comparative example; the upper limit is reduced by 30 mg / L and the lower limit is reduced by 5 mg / L compared with Example 1; the water phase contains 0-30 mg / L of oil, the upper limit is reduced by 70 mg / L and the lower limit is reduced by 80 mg / L compared with the comparative example; the upper limit is reduced by 30 mg / L and the lower limit is reduced by 10 mg / L compared with Example 1; the oil phase contains 0-20 mg / L of water, the upper limit is reduced by 30 mg / L compared with the comparative example; and the upper limit is reduced by 10 mg / L compared with Example 1.

[0054] In Example 3, on the basis of Example 2, a Fischer-Tropsch reaction product pump is added, and 1 layer of oil absorption film is added as the adsorption structure; on the basis of Example 1, a Fischer-Tropsch reaction product pump is added, 1 layer of oil absorption film is added as the adsorption structure, 1 layer of oil blocking structure 4 is added, and 2 cloth pipes are added; that is, Example 3 has a Fischer-Tropsch reaction product pump, has 2 layers of oil absorption film as the adsorption structure, has 2 layers of oil blocking structure 4, and has 4 cloth pipe material distributors 2; under normal temperature and pressure, the Fischer-Tropsch reaction product enters the reactor, and the gas-liquid-oil three-phase separation effect is the best; the gas phase contains 20-45 mg / L of liquid, the upper limit is reduced by 75 mg / L and the lower limit is reduced by 30 mg / L compared with the comparative example; the upper limit is reduced by 45 mg / L and the lower limit is reduced by 20 mg / L compared with Example 1; the upper limit is reduced by 15 mg / L and the lower limit is reduced by 15 mg / L compared with Example 2; the water phase contains 0-25 mg / L of oil, the upper limit is reduced by 75 mg / L and the lower limit is reduced by 80 mg / L compared with the comparative example; the upper limit is reduced by 35 mg / L and the lower limit is reduced by 10 mg / L compared with Example 1; the upper limit is reduced by 5 mg / L compared with Example 2; the oil phase contains 0-15 mg / L of water, the upper limit is reduced by 35 mg / L compared with the comparative example; the upper limit is reduced by 15 mg / L compared with Example 1; and the upper limit is reduced by 5 mg / L compared with Example 2.

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

[0056] (1) providing a mixed-phase Fischer-Tropsch reaction product to the Fischer-Tropsch product separation device as described above; the Fischer-Tropsch product separation method can 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 device, and is separated into water phase product, oil phase product and gas phase product. The water phase product is discharged from the water phase outlet 14 of the separator 1 through the coalescence structure 3, the oil phase product is discharged from the oil phase outlet 13 of the separator 1 through the adsorption structure, and the gas phase product is discharged from the gas phase outlet 12 of the separator 1 through the adsorption structure.

[0058] The Fischer-Tropsch reaction product enters the material distributor 2 from the feed inlet 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, the oil phase product floats and floats on the water phase product, and the gas phase product moves upward. Under the action of gravity, the water phase product moves downward, gathers into larger water clusters through the coalescence structure 3, and is discharged from the water phase outlet 14 of the separator 1 through the oil blocking structure 4. The flow guide structure 9 guides the residual oil intercepted by the oil blocking structure 4 to the adsorption structure. The oil phase product floats up, passes through the supporting net 5, is gathered through the adsorption structure, and is discharged from the oil phase outlet 13 of the separator 1 through the oil pump. The gas phase product moves upward, continues to move to the top through the adsorption structure, and the gas phase product filtered through the oil-gas filtering structure is discharged from the gas phase outlet 12. The intercepted oil phase product is discharged from the oil phase outlet 13.

[0059] By using the above Fischer-Tropsch product separation method, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the action of the separator, and the gas phase product entrained by the two phases is separated out, the turbulent flow of the oil phase and the water phase is reduced, the gas-liquid separation is promoted, the entrainment of mist is reduced, the separation time of the oil phase and the water phase is shortened, the purity of the three phases is effectively improved, the purity of the product in the subsequent process is improved, and the separation efficiency of each phase is improved.

[0060] From the above description and practice, it can be seen that the Fischer-Tropsch product separation device and method provided by the present application has the following advantages compared with the prior art: by using the above Fischer-Tropsch product separation device, the Fischer-Tropsch reaction product is separated into water phase product and oil phase product under the action of the separator, and the gas phase product entrained by the two phases is separated out, the turbulent flow of the oil phase and the water phase is reduced, the gas-liquid separation is promoted, the entrainment of mist is reduced, the separation time of the oil phase and the water phase is shortened, the purity of the three phases is effectively improved, the purity of the product in the subsequent process is improved, and the separation efficiency of each phase is improved.

[0061] Those skilled in the art should understand that the above description is only a specific embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A Fischer-Tropsch product separation apparatus, characterised in that, The application relates to a Fischer-Tropsch product separation device. The device comprises a separator, which comprises at least one feed inlet and, from top to bottom, a gas phase outlet, an oil phase outlet and a water phase outlet. 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 material distributor comprises at least one flow guide pipe and at least one distribution pipe. The distribution pipe is provided with at least one water phase port and at least one oil phase port on opposite sides. The distribution pipe is provided with a plurality of oil phase ports arranged along the circumferential direction. The distribution pipe is provided with a plurality of water phase ports arranged along the circumferential direction. Each of the distribution pipes is in the shape of a circular ring, and the plurality of distribution pipes are arranged in a nested manner in the shape of concentric circles.

2. The Fischer-Tropsch product separation device according to claim 1, wherein: The adsorption structure comprises an oil absorption film and a gas permeable cover plate.

3. The Fischer-Tropsch product separation device according to claim 2, wherein: The adsorption structure further comprises an oil absorption pump.

4. The Fischer-Tropsch product separation device according to claim 1, wherein: The separator is provided with a support net for supporting the adsorption structure.

5. The Fischer-Tropsch product separation device according to claim 1, wherein: At least one oil blocking structure is arranged between the water phase outlet and the coalescing structure.

6. The Fischer-Tropsch product separation device according to claim 5, wherein: A flow guide structure is arranged between the oil blocking structure and the adsorption structure.

8. A Fischer-Tropsch product separation process characterised by, 7. The Fischer-Tropsch product separation device according to claim 1, wherein: The separator is provided with an oil gas filter structure arranged between the gas phase outlet and the oil phase outlet. The application further relates to a method for separating Fischer-Tropsch reaction products. The method comprises the following steps: (1) providing the Fischer-Tropsch product separation device with mixed-phase Fischer-Tropsch reaction products; (2) separating the mixed-phase Fischer-Tropsch reaction products into water phase products, oil phase products and gas phase products in the material distributor of the Fischer-Tropsch product separation device, discharging the water phase products from the water phase outlet of the Fischer-Tropsch product separation device through the coalescing structure, discharging the oil phase products from the oil phase outlet of the Fischer-Tropsch product separation device through the adsorption structure, and discharging the gas phase products from the gas phase outlet of the Fischer-Tropsch product separation device through the adsorption structure.

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