Device and method for separating heavy aromatics in coal gas water

Abstract

The invention discloses a device for separating heavy aromatics in coal gas water in the field of coal gas water treatment, which comprises a vacuum filtering assembly, a vacuum filtering assembly, a gas water separation assembly, a gas water separation assembly and a gas water separation assembly, the feeding end of the centrifugal extraction assembly is connected with the discharging end of the vacuum filtering assembly, and the centrifugal extraction assembly is used for carrying out centrifugal extraction on the extraction liquid filtered by the vacuum filtering assembly; the chromatography assembly is connected with the discharging end of the centrifugal extraction assembly through a feeding assembly, the feeding assembly is used for feeding the fluid extracted by the centrifugal extraction assembly into the chromatography assembly, and the chromatography assembly is used for performing column layering on the fluid extracted by the centrifugal extraction assembly; and a separation method; the heavy aromatics fractionating tower has the beneficial effects that the heavy aromatics are extracted layer by layer by arranging the vacuum filtering assembly, the centrifugal extraction assembly and the chromatography assembly, and compared with heavy aromatics separation of an existing fractionating tower, the energy consumption is lower, and the separated product precision is higher.

Description

Technical Field

[0001] The present invention relates to the field of coal gas water treatment, and in particular to a device and method for separating heavy aromatics from coal gas water. Background Art

[0002] Coal gasification is a clean and efficient technology that converts coal into synthesis gas, primarily used in the fuel and chemical industries. The gasification process produces a mixture of gas and water. Gas-water separation, a core technology, is crucial for the efficient conversion of coal resources. This process first separates tar, dust, phenols, and ammonia from the water. This process not only recovers valuable substances, such as heavy aromatics, from the wastewater, generating significant economic benefits, but also ensures that the wastewater meets discharge standards or can be reused.

[0003] Heavy aromatics are a type of hydrocarbons consisting of single, double, or multiple rings with C9, C 10 Heavy aromatics, primarily aromatic compounds, have boiling points between 150-250°C. Heavy aromatics separated by gas-water separation units are crucial raw materials for the chemical industry. However, due to the limited boiling points of their basic components and the high cost of separation, large-scale development and utilization are difficult to achieve, hindering the goal of efficient utilization of the growing heavy aromatic resource.

[0004] To this end, we propose a device and method for separating heavy aromatics from coal gas and water. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a device and method for separating heavy aromatics from coal gas and water.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is: A device for separating heavy aromatic hydrocarbons from coal gas and water comprises: a vacuum filtration component with an opening at the top, used for vacuum filtration of heavy aromatic hydrocarbon raw materials; a centrifugal extraction component, the feed end of which is connected to the discharge end of the vacuum filtration component, used for centrifugal extraction of the extracted liquid after filtration by the vacuum filtration component; a chromatography component, which is connected to the discharge end of the centrifugal extraction component via a feeding component, the feeding component being used to feed the fluid extracted by the centrifugal extraction component into the chromatography component, and the chromatography component being used to perform column chromatography on the fluid extracted by the centrifugal extraction component.

[0007] Heavy aromatics are separated step by step through vacuum filtration components, centrifugal extraction components and chromatography components, from simple extraction separation to subsequent column chromatography separation, thus achieving the separation and enrichment of different valuable compounds in heavy aromatics. Compared with the separation of heavy aromatics through distillation towers, the energy consumption is lower and the purity of the separated target products is higher.

[0008] It is further defined that the vacuum filtration assembly includes a filter cartridge, a vacuum tube, a filter cover and a vacuum pump; the filter cartridge is in the shape of a cylindrical barrel with an open top, the filter cover is fixed to the feed end of the vacuum tube, the feed end of the vacuum tube is vertically located at the bottom of the filter cartridge so that the filter cover contacts the bottom of the filter cartridge, and the discharge end of the vacuum tube is connected to the feed end of the vacuum pump; by adding heavy aromatic raw materials and corresponding extraction solvents into the filter cartridge, starting the vacuum pump, the vacuum pump draws the liquid in the heavy aromatic raw materials from the filter cover into the vacuum tube, and sends it to the next device through the vacuum pump, thereby achieving preliminary vacuum filtration, with a simple structure and good effect.

[0009] It is further defined that the centrifugal extraction assembly includes a drum member, a centrifugal motor, a first feed inlet, a second feed inlet, a heavy phase outlet, and a light phase outlet; the centrifugal motor is fixedly mounted on the top of the drum member to drive the drum inside the drum member, the first feed inlet and the second feed inlet are relatively located on the left and right sides of the lower portion of the drum member, the first feed inlet and the second feed inlet are both connected to the turbine disk inside the drum member, the heavy phase outlet and the light phase outlet are also relatively located on the left and right sides of the upper portion of the drum member, and the height of the heavy phase outlet is lower than that of the light phase outlet; The discharge end of the vacuum pump is connected to the first feed port, and the second feed port is connected to a feed main pipe. The first feed branch pipe and the second feed branch pipe are vertically spaced apart. The first feed branch pipe and the second feed branch pipe are both provided with an opening and closing valve, and the bottom ends are respectively placed in the first storage barrel and the second storage barrel. The heavy phase outlet is connected to a three-way valve, the inlet end of the three-way valve is connected to the light phase outlet, the outlet end is connected to the feed end of the feeding assembly, and the reversing end is connected to a return pipe, and the end of the return pipe is placed in the second storage barrel.

[0010] By arranging a three-way valve and a return pipe on the light phase outlet, and arranging a first feed branch pipe and a second feed branch pipe, the first storage barrel is used as a container for placing the extraction solvent for the first centrifugal extraction. By storing the light phase mixture extracted by the first centrifugal extraction in the second storage barrel, the light phase mixture in the second storage barrel can be subjected to a second centrifugal extraction by switching the opening and closing valves, so that the mixture can be extracted and separated more finely and thoroughly.

[0011] It is further defined that the feeding assembly includes a feeding pipe, a feeding auger and a feeding motor; the outlet end of the three-way valve is connected to the feed end of the feeding pipe, the feeding auger is arranged in the feeding pipe, the feeding motor is arranged at one end of the feeding pipe, and the output shaft extends into the feeding pipe and is fixedly connected to the feeding auger.

[0012] It is further defined that the chromatography component includes multiple chromatography columns, a feeding tube, a discharge main pipe, a first discharge branch pipe, a second discharge branch pipe, a first collecting cylinder and a second collecting cylinder; multiple chromatography columns are arranged in parallel, and adjacent chromatography columns are connected end to end, the feed end of the first chromatography column is connected to the discharge end of the feeding tube, the discharge main pipe is connected to the discharge end of the last chromatography column, the first discharge branch pipe and the second discharge branch pipe are vertically spaced apart on the discharge main pipe, the ends of the first discharge branch pipe and the second discharge branch pipe are respectively located in the first collecting cylinder and the second collecting cylinder, and the first discharge branch pipe and the second discharge branch pipe are both provided with discharge valves for controlling opening and closing.

[0013] The extract delivered from the feed pipe is subjected to column chromatography through multiple chromatography columns. Multiple chromatography columns can perform chromatography more thoroughly and the product purity is higher. Setting the first discharge branch pipe and the second discharge branch pipe makes it easier to collect two different chromatography products.

[0014] It is further defined that the feeding pipe is arranged to be inclined at 15°-30° along the feeding direction; the inclined feeding pipe can avoid material blockage or stratification.

[0015] A separation method for separating heavy aromatics from coal gas and water using the above-mentioned heavy aromatics separation device comprises the following steps: S1. A heavy aromatic fluid and carbon disulfide were mixed at a mass ratio of 1:10, the mixture was added to a filter cartridge, and a vacuum pump was activated to filter the mixture. The filtered extract B entered a vacuum tube through a filter cover. The vacuum pump then transported the extract B to a centrifugal extraction assembly. The filter cover had a pore size of 0.45 μm. S2. Before extract B enters the drum through the first inlet, petroleum ether and methanol are mixed in a first storage drum at a mass ratio of 1:8:4. The on-off valve on the first feed branch is opened, allowing extract B to enter the drum through the first inlet and the petroleum ether and methanol mixture to enter the drum through the second inlet for primary centrifugal extraction. The petroleum ether phase C of the primary extraction is discharged from the light phase outlet for storage, while the methanol phase D and carbon disulfide phase E are discharged from the heavy phase outlet. The three-way valve is then adjusted to connect the heavy phase outlet to the return line, allowing the methanol phase D and carbon disulfide phase E mixture to enter the second storage drum. S3. After the initial extraction is complete, the on-off valve on the first feed branch is closed, the on-off valve on the second feed branch is opened, and the three-way valve is adjusted to connect the heavy phase outlet to the feed end of the feed pipe. The mixture of methanol phase D and carbon disulfide phase E enters the drum through the second inlet for a second centrifugal extraction. The methanol phase D, as the light phase, is discharged from the light phase outlet for storage, while the carbon disulfide phase E, as the heavy phase, enters the feed pipe. The feed auger delivers carbon disulfide phase E to the chromatography module for column chromatography. During both extractions, the extraction motor speed is 3000 rpm, and the drum separation factor in the drum is 2000 g. S4. Before the carbon disulfide phase E enters the chromatography column, fill the chromatography column with 400 mesh pre-dried silica gel with a filling density of 0.45 g / cm 3 After the carbon disulfide phase E enters the chromatography column, petroleum ether is added through the feeding tube on the first chromatography column to elute the carbon disulfide phase E. At the same time, the discharge valve on the first discharge branch pipe located at the distal end of the discharge main pipe is opened to collect the eluted alkane compounds F into the first collection cylinder; S5. When it is observed that the alkane compound F discharged from the first discharge branch pipe becomes colorless, petroleum ether and ethyl acetate in a mass ratio of 10:1 are added from the feeding tube again for elution. When colored eluate is observed to be discharged, the discharge valve on the first discharge branch pipe is closed and the discharge valve on the second discharge branch pipe is opened to collect the colored polycyclic aromatic hydrocarbon compound G. When it is observed that the discharged eluate becomes colorless, the chromatography component is closed to complete the separation of heavy aromatic hydrocarbons.

[0016] According to the separation method, heavy aromatic hydrocarbons are first extracted preliminarily through a vacuum filtration component, and the aromatic hydrocarbon content in the extract B can reach more than 50%. The extract B is then subjected to dual-solvent extraction with petroleum ether and methanol through a centrifugal extraction component. After the two extractions, the relative content of aromatic hydrocarbons in the carbon disulfide phase E is further increased, and the relative content of alkanes and other heteroatom-containing compounds is further reduced. The carbon disulfide phase E is selected as the raw material for column chromatography, and continuous multiple column chromatography operations are performed through the chromatography component. The relative content of aromatic hydrocarbons in the condensed-ring aromatic hydrocarbon compound G can reach more than 80%. Through the above-mentioned step-by-step separation and enrichment method, the relative content of aromatic hydrocarbons in the product obtained by heavy aromatic hydrocarbon separation is greatly increased, and the purity is improved.

[0017] The beneficial effects of the present invention are: by arranging a vacuum filtration component, a centrifugal extraction component and a chromatography component, heavy aromatic hydrocarbons are extracted layer by layer. Compared with the heavy aromatic hydrocarbon separation of the existing distillation tower, the energy consumption is lower and the separated products are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A simple schematic diagram of the connection relationship of various devices of the present invention; Figure 2 It is a bar graph of the content of each substance in extract B; Figure 3 It is a bar graph of the content of each substance in petroleum ether phase C, methanol phase D and carbon disulfide phase E; Figure 4 It is a bar chart showing the content of each substance in alkane compound F and condensed ring aromatic hydrocarbon compound G.

[0019] The symbols of the components are as follows: Vacuum filtration assembly 1, filter cartridge 11, vacuum tube 12, filter cover 13, vacuum pump 14, centrifugal extraction assembly 2, drum 21, centrifugal motor 22, first feed port 23, second feed port 24, heavy phase outlet 25, light phase outlet 26, feed main pipe 27, first feed branch pipe 28, second feed branch pipe 29, on-off valve 210, first storage barrel 211, second storage barrel 212, three-way valve 213, return pipe 214, feeding assembly 3, feeding pipe 31, feeding augers 32, feeding motor 33, chromatography assembly 4, chromatography column 41, feeding pipe 42, discharge main pipe 43, first discharge branch pipe 44, second discharge branch pipe 45, first collecting barrel 46, second collecting barrel 47, discharge valve 48. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0021] Example: like Figure 1As shown, a device for separating heavy aromatic hydrocarbons from coal gas and water includes a vacuum filtration component 1, a centrifugal extraction component 2, a feeding component 3 and a chromatography component 4; the vacuum filtration component 1 is set with an opening at the top and is used to realize vacuum filtration of heavy aromatic hydrocarbon raw materials; the vacuum filtration component 1 includes a filter cartridge 11, a vacuum tube 12, a filter cover 13 and a vacuum pump 14; the filter cartridge 11 is in the shape of a cylindrical barrel with an opening at the top, the filter cover 13 is fixed to the feed end of the vacuum tube 12, the feed end of the vacuum tube 12 is vertically located at the bottom of the filter cartridge 11, so that the filter cover 13 contacts the bottom of the filter cartridge 11, and the discharge end of the vacuum tube 12 is connected to the feed end of the vacuum pump 14; the centrifugal extraction component 2 is used to vacuum filter the vacuum filtration component 1 The filtered extract is subjected to centrifugal extraction; the centrifugal extraction component 2 includes a drum 21, a centrifugal motor 22, a first feed port 23, a second feed port 24, a heavy phase outlet 25, and a light phase outlet 26; the centrifugal motor 22 is fixedly arranged on the top of the drum 21 to drive the drum inside the drum 21, the first feed port 23 and the second feed port 24 are relatively arranged on the left and right sides of the lower part of the drum 21, the first feed port 23 and the second feed port 24 are both connected to the turbine disk inside the drum 21, the heavy phase outlet 25 and the light phase outlet 26 are also relatively arranged on the left and right sides of the upper part of the drum 21, and the height of the heavy phase outlet 25 is lower than that of the light phase outlet 26; the vacuum pump 14 The discharge end is connected to the first feed port 23, and the second feed port 24 is connected to the feed main pipe 27. The first feed branch pipe 28 and the second feed branch pipe 29 are vertically spaced apart on the feed main pipe 27. The first feed branch pipe 28 and the second feed branch pipe 29 are both provided with an on-off valve 210, and the bottom ends are respectively placed in the first storage barrel 211 and the second storage barrel 212. The heavy phase outlet 25 is connected to a three-way valve 213, the inlet end of the three-way valve 213 is connected to the light phase outlet 26, the outlet end is connected to the feed end of the feeding component 3, and the reversing end is connected to a return pipe 214, and the end of the return pipe 214 is placed in the second storage barrel 212; the chromatography component 4 is connected to the feeding component 3 and the centrifugal extraction component through the feeding component 3. The discharge end of the three-way valve 2 is connected, and the feeding assembly 3 includes a feeding pipe 31, a feeding auger 32 and a feeding motor 33; the outlet end of the three-way valve 213 is connected to the feed end of the feeding pipe 31, the feeding auger 32 is arranged in the feeding pipe 31, and the feeding motor 33 is arranged at one end of the feeding pipe 31, and the output shaft extends into the feeding pipe 31 and is fixedly connected to the feeding auger 32, and the feeding pipe 31 is inclined at 20 degrees along the feeding direction; the chromatography assembly 4 is used to perform column chromatography on the fluid extracted by the centrifugal extraction assembly 2; the chromatography assembly 4 includes multiple chromatography columns 41, a feeding pipe 42, a discharge main pipe 43, a first discharge branch pipe 44, a second discharge branch pipe 45, a first collection cylinder 46 and a second collection cylinder 47;Multiple chromatography columns 41 are arranged in parallel, with adjacent columns 41 connected end to end. The feed end of the first chromatography column 41 is connected to the discharge end of the feed pipe 31, and a main discharge pipe 43 is connected to the discharge end of the last chromatography column 41. A first discharge branch pipe 44 and a second discharge branch pipe 45 are vertically spaced apart on the main discharge pipe 43. The ends of the first and second discharge branches 44, 45 are respectively located in a first collection cylinder 46 and a second collection cylinder 47. The first and second discharge branches 44, 45 are each equipped with a discharge valve 48 for controlling opening and closing.

[0022] The heavy aromatics are separated step by step by the vacuum filtration component 1, the centrifugal extraction component 2 and the chromatography component 4, from simple extraction separation to subsequent column chromatography separation, so as to achieve the separation and enrichment of different valuable compounds in the heavy aromatics. Compared with the separation of heavy aromatics by a fractionating tower, the energy consumption is lower and the purity of the separated target product is higher. By adding the heavy aromatics raw material and the corresponding extraction solvent into the filter cartridge 11 and starting the vacuum pump 14, the vacuum pump 14 draws the liquid in the heavy aromatics raw material from the filter cover 13 into the vacuum tube 12, and sends it to the next device through the vacuum pump 14, a preliminary vacuum filtration is achieved, which has a simple structure and good effect. By setting a three-way valve 213 and a return pipe 214 on the light phase outlet 26, and setting The first feed branch 28 and the second feed branch 29, the first storage barrel 211 serves as a container for placing the extraction solvent for the first centrifugal extraction. By storing the light phase mixture extracted by the first centrifugal extraction in the second storage barrel 212, the light phase mixture in the second storage barrel 212 can be subjected to secondary centrifugal extraction by switching the on-off valve 210, so that the mixture can be extracted and separated more finely and thoroughly; the inclined feed pipe 31 can avoid material blockage or stratification; the extract sent out from the feed pipe 31 is subjected to column chromatography by multiple chromatography columns 41, and multiple chromatography columns 41 can perform chromatography more thoroughly and the product purity is higher. The first discharge branch 44 and the second discharge branch 45 are set to facilitate the collection of two different chromatography products.

[0023] A separation method for separating heavy aromatics from coal gas and water using the above-mentioned heavy aromatics separation device comprises the following steps: S1. A heavy aromatic fluid and carbon disulfide are mixed in a mass ratio of 1:10, the mixture is added to a filter cartridge, and a vacuum pump 14 is activated to filter the mixture. The filtered extract B enters the vacuum tube 12 through the filter cover 13. The vacuum pump 14 delivers the extract B to the centrifugal extraction assembly 2. The pore size of the filter cover 13 is 0.45 μm. S2. Before extract B enters drum member 21 through the first inlet, petroleum ether and methanol are mixed in a mass ratio of 1:8:4 in first storage barrel 211. Valve 210 on first feed branch 28 is opened, allowing extract B to enter drum member 21 through the first inlet and the petroleum ether and methanol mixture to enter drum member 21 through the second inlet for primary centrifugal extraction. The primary extracted petroleum ether phase C is discharged as the light phase through light phase outlet 26 for storage, while methanol phase D and carbon disulfide phase E are discharged through heavy phase outlet 25. Three-way valve 213 is then adjusted to connect heavy phase outlet 25 to return line 214, allowing the methanol phase D and carbon disulfide phase E mixture to enter second storage barrel 212. S3. After the initial extraction is complete, the on-off valve 210 on the first feed branch 28 is closed, the on-off valve 210 on the second feed branch 29 is opened, and the three-way valve 213 is adjusted to connect the heavy phase outlet 25 to the feed end of the feed pipe 31. The mixture of the methanol phase D and the carbon disulfide phase E enters the drum member 21 through the second inlet for a second centrifugal extraction. The methanol phase D, serving as the light phase, is discharged from the light phase outlet 26 for storage, while the carbon disulfide phase E, serving as the heavy phase, enters the feed pipe 31. The feed auger 32 feeds the carbon disulfide phase E into the chromatography assembly 4 for column chromatography. During both extractions, the extraction motor speed is 3000 rpm, and the drum separation factor in the drum member 21 is 2000 g. S4. Before the carbon disulfide phase E enters the chromatography column 41, 400-mesh pre-dried silica gel is filled into the chromatography column 41 at a packing density of 0.45 g / cm3. After the carbon disulfide phase E enters the chromatography column 41, petroleum ether is added through the feeding pipe 42 on the first chromatography column 41 to elute the carbon disulfide phase E. Simultaneously, the discharge valve 48 on the first discharge branch 44 located at the distal end of the discharge main pipe 43 is opened, and the eluted alkane compounds F are collected in the first collection cylinder 46; S5. When it is observed that the alkane compound F discharged from the first discharge branch 44 becomes colorless, petroleum ether and ethyl acetate in a mass ratio of 10:1 are added from the feeding pipe 42 again for elution. When colored eluate is observed to be discharged, the discharge valve 48 on the first discharge branch 44 is closed, and the discharge valve 48 on the second discharge branch 45 is opened to collect the colored condensed ring aromatic compound G. When it is observed that the discharged eluate becomes colorless, the chromatography component 4 is closed to complete the separation of heavy aromatics.

[0024] like Figure 2-Figure 4As shown, through this separation method, the heavy aromatics are first extracted preliminarily by the vacuum filtration component 1, and the aromatic content in the extract B can reach more than 50%. The extract B is then subjected to dual-solvent extraction through petroleum ether and methanol through the centrifugal extraction component 2. After the two extractions, the relative content of aromatics in the carbon disulfide phase E is further increased, and the relative content of alkanes and other heteroatom-containing compounds is further reduced. The carbon disulfide phase E is selected as the raw material for column chromatography, and continuous multiple column chromatography operations are performed through the chromatography component 4. The relative content of aromatics in the condensed-ring aromatic compound G can reach more than 80%. Through the above-mentioned step-by-step separation and enrichment method, the relative content of aromatics in the product obtained by heavy aromatics separation is greatly improved, and the purity is improved.

Claims

1. A device for separating heavy aromatic hydrocarbons from coal gas and water, characterized in that: include: A vacuum filtration assembly (1) having an opening at the top and used for vacuum filtration of heavy aromatic hydrocarbon raw materials; A centrifugal extraction component (2), the feed end of which is connected to the discharge end of the vacuum filtration component (1), and is used to centrifugally extract the extract after filtration by the vacuum filtration component (1); The chromatography component (4) is connected to the discharge end of the centrifugal extraction component (2) via a feeding component (3). The feeding component (3) is used to feed the fluid extracted by the centrifugal extraction component (2) into the chromatography component (4). The chromatography component (4) is used to perform column chromatography on the fluid extracted by the centrifugal extraction component (2).

2. The device for separating heavy aromatic hydrocarbons from coal gas and water according to claim 1, characterized in that: The vacuum filtration assembly (1) comprises a filter cartridge (11), a vacuum tube (12), a filter cover (13) and a vacuum pump (14); the filter cartridge (11) is in the shape of a cylinder with an open top, the filter cover (13) is fixedly arranged at the feed end of the vacuum tube (12), the feed end of the vacuum tube (12) is vertically located at the bottom of the filter cartridge (11), so that the filter cover (13) contacts the bottom of the filter cartridge (11), and the discharge end of the vacuum tube (12) is connected to the feed end of the vacuum pump (14).

3. The device for separating heavy aromatic hydrocarbons from coal gas and water according to claim 2, characterized in that: The centrifugal extraction component (2) comprises a drum member (21), a centrifugal motor (22), a first feed port (23), a second feed port (24), a heavy phase outlet (25) and a light phase outlet (26); the centrifugal motor (22) is fixedly arranged on the top of the drum member (21) to drive the drum inside the drum member (21); the first feed port (23) and the second feed port (24) are relatively arranged on the left and right sides of the lower part of the drum member (21); the first feed port (23) and the second feed port (24) are both communicated with the turbine disk inside the drum member (21); the heavy phase outlet (25) and the light phase outlet (26) are also relatively arranged on the left and right sides of the upper part of the drum member (21); the height of the heavy phase outlet (25) is lower than the height of the light phase outlet (26); The discharge end of the vacuum pump (14) is connected to the first feed port (23), and the second feed port (24) is connected to a feed main pipe (27). A first feed branch pipe (28) and a second feed branch pipe (29) are vertically spaced apart on the feed main pipe (27). The first feed branch pipe (28) and the second feed branch pipe (29) are both provided with an on-off valve (210), and the bottom ends are respectively placed in the first storage barrel (211) and the second storage barrel (212). The heavy phase outlet (25) is connected to a three-way valve (213), the inlet end of the three-way valve (213) is connected to the light phase outlet (26), the outlet end is connected to the feed end of the feeding assembly (3), and the reversing end is connected to a return pipe (214), and the end of the return pipe (214) is placed in the second storage barrel (212).

4. The device for separating heavy aromatic hydrocarbons from coal gas and water according to claim 3, characterized in that: The feeding assembly (3) includes a feeding pipe (31), a feeding auger (32) and a feeding motor (33); the outlet end of the three-way valve (213) is connected to the feeding end of the feeding pipe (31), the feeding auger (32) is arranged in the feeding pipe (31), and the feeding motor (33) is arranged at one end of the feeding pipe (31), and the output shaft extends into the feeding pipe (31) and is fixedly connected to the feeding auger (32).

5. The device for separating heavy aromatic hydrocarbons from coal gas and water according to claim 4, characterized in that: The chromatography component (4) includes a plurality of chromatography columns (41), a feeding pipe (42), a discharge main pipe (43), a first discharge branch pipe (44), a second discharge branch pipe (45), a first collection cylinder (46) and a second collection cylinder (47); the plurality of chromatography columns (41) are arranged in parallel, and the adjacent chromatography columns (41) are connected end to end, the feed end of the first chromatography column (41) is connected to the discharge end of the feeding pipe (31), and the discharge main pipe (43) is connected to the last chromatography column (41). The first discharge branch pipe (44) and the second discharge branch pipe (45) are vertically spaced apart and arranged on the discharge main pipe (43). The ends of the first discharge branch pipe (44) and the second discharge branch pipe (45) are respectively located in the first collecting cylinder (46) and the second collecting cylinder (47). The first discharge branch pipe (44) and the second discharge branch pipe (45) are both provided with a discharge valve (48) for controlling opening and closing.

6. The device for separating heavy aromatic hydrocarbons from coal gas and water according to claim 5, characterized in that: The feeding pipe (31) is arranged to be inclined at 15°-30° along the feeding direction.

7. A separation method for separating heavy aromatics from gas and water using the heavy aromatics separation device according to claim 6, characterized in that: The steps include: S1. A heavy aromatic hydrocarbon fluid and carbon disulfide are mixed in a mass ratio of 1:10, the mixture is added to a filter cartridge, a vacuum pump (14) is turned on to filter the mixture, and the filtered extract B enters the vacuum tube (12) from the filter cover (13). The vacuum pump (14) transports the extract B to the centrifugal extraction assembly (2). The pore size of the filter cover (13) is 0.45 μm. S2. Before the extract B enters the drum member (21) from the first inlet, the extract B: petroleum ether: methanol are mixed in a mass ratio of 1:8:4 in the first storage barrel (211), and the on-off valve (210) on the first feed branch pipe (28) is opened. The extract B enters the drum member (21) from the first inlet, and the petroleum ether and methanol mixture enters the drum member (21) from the second inlet for primary centrifugal extraction. The petroleum ether phase C of the primary extraction is discharged from the light phase outlet (26) as a light phase for storage, and the methanol phase D and the carbon disulfide phase E are discharged from the heavy phase outlet (25). At this time, the three-way valve (213) is adjusted to connect the heavy phase outlet (25) and the return pipe (214), and the methanol phase D and the carbon disulfide phase E mixture enter the second storage barrel (212); S3. After the initial extraction is completely completed, the on-off valve (210) on the first feed branch (28) is closed, the on-off valve (210) on the second feed branch (29) is opened, and the three-way valve (213) is adjusted to connect the heavy phase outlet (25) and the feed end of the feed pipe (31). The mixture of the methanol phase D and the carbon disulfide phase E enters the drum member (21) from the second inlet for re-centrifugal extraction. The methanol phase D as the light phase is discharged from the light phase outlet (26) for storage, and the carbon disulfide phase E as the heavy phase enters the feed pipe (31). The feed agitator (32) feeds the carbon disulfide phase E into the chromatography component (4) for column chromatography. During the two extraction processes, the rotation speed of the extraction motor is 3000 rpm and the drum separation factor in the drum member (21) is 2000 g. S4. Before the carbon disulfide phase E enters the chromatography column (41), 400 mesh pre-dried silica gel is filled into the chromatography column (41) with a filling density of 0.45 g / cm 3 After the carbon disulfide phase E enters the chromatography column (41), petroleum ether is added through the feeding pipe (42) on the first chromatography column (41) to elute the carbon disulfide phase E. At the same time, the discharge valve (48) on the first discharge branch pipe (44) at the far end of the discharge main pipe (43) is opened to collect the eluted alkane compound F into the first collection cylinder (46); S5. When it is observed that the alkane compound F discharged from the first discharge branch (44) becomes colorless, petroleum ether and ethyl acetate in a mass ratio of 10:1 are added from the feeding pipe (42) for elution again. When colored eluate is observed to be discharged, the discharge valve (48) on the first discharge branch (44) is closed, and the discharge valve (48) on the second discharge branch (45) is opened to collect the colored polycyclic aromatic compound G. When it is observed that the discharged eluate becomes colorless, the chromatography component (4) is closed to complete the separation of heavy aromatic hydrocarbons.

Images