Apparatus and method for preparing styrene

Abstract

The application discloses a device and method for preparing styrene, and relates to the technical field of styrene preparation equipment. The device comprises a preheating part and a catalyst loading part, wherein the catalyst loading part is arranged below the preheating part. The preheating part has an adiabatic base body with a hollow columnar structure with two open ends. An end cover is arranged at one end of the adiabatic base body, and a discharging cavity is arranged at the other end of the adiabatic base body. A preheating cavity is coaxially arranged in the adiabatic base body. One end of a feeding pipe is inwardly contracted to form a tapered part, and a plurality of distribution through holes are arranged on the tapered part in a circumferential direction. One end of the preheating cavity is inwardly contracted to form a discharging pipe. The device of the application has the advantages that the preheating section and the reaction section are arranged in the same adiabatic vertical shell, and the preheating section and the reaction section can be continuously heated by using a heater. In the reaction process, a sheathed thermocouple is used for temperature monitoring of the whole section, so that the temperature difference of each part of the reaction section is controlled within a controllable range, thereby improving the conversion rate of ethylbenzene.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of styrene preparation equipment, in particular to a device and method for preparing styrene. BACKGROUND

[0002] The main steps in the production of styrene are dehydrogenation of ethylbenzene and styrene rectification, and the styrene product is obtained, and the catalytic dehydrogenation of ethylbenzene to produce styrene in the presence of water vapor, the reaction is carried out in two series of adiabatic fixed bed reactors with interstage reheaters, at the same time, some side reactions also occur, and the most significant side reactions are the generation of benzene and toluene, the catalytic dehydrogenation reaction is an endothermic reaction, and it is also a volume increasing reaction, therefore, high temperature and low pressure (i.e. negative pressure) are beneficial to the equilibrium of the dehydrogenation reaction of ethylbenzene, and the heat required for the reaction is provided by superheated steam from a steam superheater, the material from the second dehydrogenation reactor is cooled through a series of heat recovery heat exchangers, at the same time, the ethylbenzene / steam feed is heated and steam is generated, and the dehydrogenation mixture after a series of cooling and oil-water separation is sent to a styrene rectification system, and the purpose of the styrene rectification system is to use the rectification method to rectify the dehydrogenation mixture into circulating ethylbenzene, benzene / toluene, product styrene and styrene tar.

[0003] In the prior art, a distillation column for improving the yield of a petroleum hydrocarbon fraction and a feeding method thereof (US20130220889A1) is disclosed, which comprises a vaporization section and a fractionation section, and further comprises a pressure feeding system for feeding a petroleum hydrocarbon raw material oil to be fractionated at a pressure 100-1000 kPa higher than that of the vaporization section of the distillation column; by preheating the petroleum hydrocarbon raw material oil to be fractionated, the preheated petroleum hydrocarbon raw material oil is fed to the vaporization section through the pressure feeding system at a pressure 100-1000 kPa higher than that of the vaporization section of the distillation column, and is atomized and vaporized, and then is sent to the fractionation section for distillation separation, and finally, distillates are discharged from the top and / or side of the column and heavy oil that is not vaporized is discharged from the bottom; but it still has the problems of slow reaction rate, insufficient reaction, and low catalyst utilization rate. SUMMARY

[0004] The purpose of the present application is to provide a device and method for preparing styrene, so as to improve the vaporization amount of raw materials, the reaction rate, the catalyst utilization rate and the conversion rate of styrene.

[0005] In order to achieve the above object, the present application provides the following technical scheme: a device for preparing styrene, comprising a preheating part and a catalyst loading part, wherein the catalyst loading part is arranged below the preheating part. The preheating part has an adiabatic base body with a hollow columnar structure with two open ends, one end of the adiabatic base body is provided with an end cover, a coaxial feed pipe is arranged on the end cover, the other end of the adiabatic base body is provided with a discharge cavity, a coaxial preheating cavity is arranged in the adiabatic base body, the preheating cavity also has a columnar hollow structure with two open ends, one end of the feed pipe extends into the preheating cavity, one end of the feed pipe is inwardly contracted to form a tapered portion, a plurality of distribution through holes are arranged on the tapered portion in a circumferential direction, one end of the preheating cavity is inwardly contracted to form a discharge pipe, and the diameter of the discharge pipe increases along the discharge direction.

[0006] The device for preparing styrene is prepared by a catalytic dehydrogenation route of ethylbenzene, that is, ethylbenzene is subjected to alkyl dehydrogenation at a high temperature of 580-620 DEG C under the action of a catalyst to obtain styrene. At the same time, side reactions such as alkyl chain breaking, dealkylation and carbon formation occur. The preheating section and the reaction section are arranged in the same adiabatic vertical shell, and the preheating section and the reaction section can be continuously heated by using a heater. A sheathed thermocouple is used for temperature monitoring of the whole section during the reaction, so that the temperature difference of each part of the reaction section is controlled within a controllable range, thereby improving the conversion rate of ethylbenzene.

[0007] The device for preparing styrene is prepared by a catalytic dehydrogenation route of ethylbenzene, that is, ethylbenzene is subjected to alkyl dehydrogenation at a high temperature of 580-620 DEG C under the action of a catalyst to obtain styrene. At the same time, side reactions such as alkyl chain breaking, dealkylation and carbon formation occur. The preheating section and the reaction section are arranged in the same adiabatic vertical shell, and the preheating section and the reaction section can be continuously heated by using a heater. A sheathed thermocouple is used for temperature monitoring of the whole section during the reaction, so that the temperature difference of each part of the reaction section is controlled within a controllable range, thereby improving the conversion rate of ethylbenzene.

[0008] The adiabatic base body and the upper end cover are connected by a first connecting flange, and the adiabatic base body and the discharge cavity are connected by a second connecting flange.

[0009] The catalyst loading part has a loading base body with a hollow columnar structure with one open end, a discharge port is arranged at the bottom of the outer side wall of the loading base body, the axis of the discharge port is inclined downward, two discharge ports are symmetrically arranged about the axial surface of the loading base body, an upper cover is arranged at the open end of the loading base body, a ring-shaped flange is arranged at the open end of the loading base body, the upper cover is detachably connected to the ring-shaped flange, a main loading plate is arranged in the loading base body, a sealing ring is arranged in the loading base body, a sieve plate is arranged in the loading base body, a gasket is arranged in the loading base body, and the main loading plate, the sealing ring, the sieve plate, the gasket and the flow guide pipe are coaxially and parallelly arranged in the loading base body from bottom to top.

[0010] The device for preparing styrene, by loading catalyst in the catalyst loading part, makes the reaction of gas phase ethylbenzene and water entering from the flow guide pipe fast, the dehydrogenation catalyst is preferably iron oxide catalyst, the ethylbenzene conversion rate can reach more than 70%, and the styrene selectivity can reach more than 95%. Wherein, in the process of initially loading catalyst in the catalyst loading part, the screen plate can screen out the catalyst with suitable particle size, the size of the screen hole of the screen plate can be adjusted according to actual needs, the screened catalyst falls into the loading hole of the main loading plate, the catalyst with large particles is avoided to be loaded, the gap between the catalysts is increased, the density of the catalyst is reduced, and the reaction rate is not conducive to improvement. Wherein, the obtained gas phase crude styrene and the ethylbenzene or water which is not vaporized in time are discharged through the discharge port, the crude styrene flows to the condensing section, and the ethylbenzene or water raw material is recycled by the circulating pump.

[0011] The flow guide pipe is provided in the loading base body, one end of the flow guide pipe is provided with a flow guide opening, and the other end of the flow guide pipe penetrates the upper cover and is communicated with the discharge pipe.

[0012] The device for preparing styrene, by the design of the flow guide opening on the flow guide pipe, the gas phase ethylbenzene and water can be dispersed in multiple directions for reaction after entering the loading base body, the utilization rate of the loaded catalyst is improved, and the reaction is accelerated.

[0013] Compared with the prior art, the device for preparing styrene has the following beneficial effects:

[0014] 1. The device for preparing styrene, by the design of the preheating part, the effective mixing of ethylbenzene and water is realized, the vaporization amount of ethylbenzene and water in the preheating section is increased, and the gas phase ethylbenzene and water passing through the discharge pipe are increased.

[0015] 2. The device for preparing styrene, by utilizing the Venturi effect, the flow rate of the gas phase ethylbenzene and water flowing through the discharge pipe is increased, the time for reaching the inside of the catalyst loading part is shortened, and the reaction rate is improved.

[0016] 3. The device for preparing styrene, by utilizing the screen plate, the catalyst with suitable particle size can be screened out, the catalyst with large particles is avoided to be loaded, the reaction rate is not conducive to improvement, and the ethylbenzene or water which is not vaporized in time can be discharged through the discharge port and then recycled by the circulating pump.

[0017] 4. The device for preparing styrene, by the design of the flow guide opening on the flow guide pipe, the gas phase ethylbenzene and water can be dispersed in multiple directions for reaction after entering the loading base body, the utilization rate of the loaded catalyst is improved, and the reaction is accelerated. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A flow chart for preparing styrene according to the present application;

[0019] Figure 2 A Figure 1 A schematic view of the structure of the preheating element in the preheating section;

[0020] Figure 3 A Figure 2 A front view of the preheating element;

[0021] Figure 4 A Figure 3 A sectional view along A-A shown in Fig. 1;

[0022] Figure 5 A Figure 4 An enlarged view of I-I shown in Fig. 1;

[0023] Figure 6 A schematic view of the connecting structure of the preheating element and the catalyst loading element;

[0024] Figure 7 A Figure 6 A schematic view of the structure of the catalyst loading element;

[0025] Figure 8 A Figure 7 An exploded view of the catalyst loading element;

[0026] Figure 9 A Figure 8 An enlarged view of II-II in Fig. 2;

[0027] Figure 10 A Figure 1 A schematic view of the structure of the condenser in the condensing section;

[0028] Figure 11 A Figure 10 A schematic view of the structure of the condensing element;

[0029] Figure 12 A Figure 11 A plan view of the condensing element;

[0030] Figure 13 A Figure 12 A sectional view along B-B shown in Fig. 3;

[0031] Figure 14 A Figure 1 A partial sectional view of the circulating pump;

[0032] Figure 15 A Figure 14 A schematic view of the structure of the double impeller;

[0033] Figure 16 A Figure 15 A front view of the double impeller;

[0034] Figure 17 Fig. 1 is a perspective view of the device for preparing styrene. Figure 15 Fig. 2 is a top view of the device for preparing styrene.

[0035] In the figure: 1, preheating part; 11, heat insulation base body; 111, end cover; 112, discharge cavity; 12, feeding pipe; 121, tapered part; 122, distribution through hole; 13, preheating cavity; 14, discharge pipe; 15, first connecting flange; 16, second connecting flange; 2, catalyst loading part; 21, loading base body; 211, discharge port; 212, upper cover; 213, annular flange; 22, main loading plate; 23, sealing ring; 24, sieve plate; 25, gasket; 26, flow guide pipe; 261, flow guide port; 3, condenser; 31, outer shell; 32, condensing part; 33, condensing base body; 331, condensing blade plate; 332, air bag; 333, air pipe; 34, air inlet rod; 4, circulating pump; 41, pump body; 411, flow guide chamber; 42, inlet end; 43, outlet end; 44, inlet pipe; 45, double impeller; 451, rotating shaft; 452, bearing; 453, impeller plate; 454, first blade; 455, second blade. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Embodiment one provided by the present application:

[0038] Please refer to Figures 1-5 A device for preparing styrene, comprising a preheating part 1 and a catalyst loading part 2, wherein the catalyst loading part 2 is arranged below the preheating part 1. The preheating part 1 has a heat insulation base body 11 with a hollow columnar structure with two open ends. An end cover 111 is arranged at one end of the heat insulation base body 11. A feeding pipe 12 is coaxially arranged on the end cover 111. A discharge cavity 112 is arranged at the other end of the heat insulation base body 11. A preheating cavity 13 is coaxially arranged in the heat insulation base body 11. The preheating cavity 13 also has a columnar hollow structure with two open ends. One end of the feeding pipe 12 extends into the preheating cavity 13. The one end of the feeding pipe 12 is inwardly tapered to form a tapered part 121. A plurality of distribution through holes 122 are arranged on the tapered part 121 in a circumferential direction. The one end of the preheating cavity 13 is inwardly tapered to form a discharge pipe 14. The diameter of the discharge pipe 14 increases along the discharge direction.

[0039] The device for preparing styrene is prepared by the route of catalytic dehydrogenation of ethylbenzene, that is, ethylbenzene is subjected to alkyl dehydrogenation at a high temperature of 580-620 DEG C under the action of a catalyst to obtain styrene. Meanwhile, side reactions such as alkyl chain breaking, dealkylation and carbon formation are accompanied. In the device, the preheating section and the reaction section are arranged in the same adiabatic vertical shell, and the preheating section and the reaction section can be continuously heated by using a heater. A sheathed thermocouple is used for temperature monitoring of the whole section during the reaction, so that the temperature difference of each part of the reaction section is controlled within a controllable range, thereby improving the conversion rate of ethylbenzene.

[0040] The device for preparing styrene is prepared by the route of catalytic dehydrogenation of ethylbenzene, that is, ethylbenzene is subjected to alkyl dehydrogenation at a high temperature of 580-620 DEG C under the action of a catalyst to obtain styrene. Meanwhile, side reactions such as alkyl chain breaking, dealkylation and carbon formation are accompanied. In the device, the preheating section and the reaction section are arranged in the same adiabatic vertical shell, and the preheating section and the reaction section can be continuously heated by using a heater. A sheathed thermocouple is used for temperature monitoring of the whole section during the reaction, so that the temperature difference of each part of the reaction section is controlled within a controllable range, thereby improving the conversion rate of ethylbenzene.

[0041] The adiabatic base 11 and the upper end cover 111 are connected by a first connecting flange 15, and the adiabatic base 11 and the discharge cavity 112 are connected by a second connecting flange 16.

[0042] Please refer to Figure 1 、 Figures 6-9 , the catalyst loading part 2 has a loading base 21, the loading base 21 has a hollow columnar structure with one end open, the outer side wall of the loading base 21 is provided with a discharge port 211 at the bottom, the axis of the discharge port 211 is inclined downward, the discharge port 211 is mirror-symmetrically provided with two about the axial plane of the loading base 21, the open end of the loading base 21 is provided with an upper cover 212, the open end of the loading base 21 is provided with an annular flange 213, the upper cover 212 is detachably connected to the annular flange 213, the inside of the loading base 21 is provided with a main loading plate 22, the inside of the loading base 21 is provided with a sealing ring 23, the inside of the loading base 21 is provided with a sieve plate 24, the inside of the loading base 21 is provided with a gasket 25, and the main loading plate 22, the sealing ring 23, the sieve plate 24, the gasket 25 and the flow guide pipe 26 are coaxially and parallelly arranged from bottom to top.

[0043] The device for preparing styrene is characterized in that: the device comprises a catalyst loading part 2, a main loading plate 22, a sieve plate 24, a guide pipe 26, a discharge pipe 14, a circulating pump 4, a heater, an armored thermocouple, a condensing section, a discharge section, an ethylene / styrene column, a styrene column and a toluene / ethylbenzene column.

[0044] Please refer to Figures 6-9 The guide pipe 26 is provided with a guide opening 261 at one end, and the other end of the guide pipe 26 penetrates the upper cover 212 and is in communication with the discharge pipe 14.

[0045] The device for preparing styrene is characterized in that: the device comprises a catalyst loading part 2, a main loading plate 22, a sieve plate 24, a guide pipe 26, a discharge pipe 14, a circulating pump 4, a heater, an armored thermocouple, a condensing section, a discharge section, an ethylene / styrene column, a styrene column and a toluene / ethylbenzene column.

[0046] Please refer to Figure 1 The device for preparing styrene is characterized in that: the device comprises a catalyst loading part 2, a main loading plate 22, a sieve plate 24, a guide pipe 26, a discharge pipe 14, a circulating pump 4, a heater, an armored thermocouple, a condensing section, a discharge section, an ethylene / styrene column, a styrene column and a toluene / ethylbenzene column.

[0047] The discharge section is connected to the ethylene / styrene column through a liquid conveying pipeline, and the ethylene / styrene column is connected to the styrene column and the toluene / ethylbenzene column through a liquid conveying pipeline.

[0048] When the device is used to prepare styrene, compressed air is first introduced by the compressed air pump to check the air tightness of the device and to activate the catalyst in the catalyst loading part 2 under heating; then water vapor is introduced to replace the air in the preheating section and the reaction section, and the reaction needs to be preheated before the reaction and heated during the reaction; then ethylbenzene and water are introduced by the circulating pump 4, and the mixed gas after the reaction in the reaction section enters the condensing section to obtain liquid crude styrene, and the uncondensed hydrogen is discharged when it enters the discharge section, and the unreacted raw materials in the reaction section are recycled to the raw material area by the circulating pump;

[0049] Then the crude styrene flows into the ethylbenzene / styrene column, and the crude styrene is separated by rectification in the column, and the light components such as benzene, toluene and ethylbenzene are distilled from the top of the column to the toluene / ethylbenzene column, and the styrene and heavy components are collected from the bottom of the column to the styrene rectification column, and the crude styrene from the ethylbenzene / styrene column is deeply rectified in the column, and the qualified styrene product is distilled from the top of the column, and some heavy components are collected from the bottom of the column; the top product from the ethylbenzene / styrene column is rectified in the toluene / ethylbenzene column, and the light components such as benzene and toluene are distilled from the top of the column to the benzene / toluene column, and the ethylbenzene is collected from the bottom of the column; the benzene / toluene column separates benzene and toluene, and benzene is distilled from the top of the column, and toluene is collected from the bottom of the column.

[0050] The present application provides example two:

[0051] Please refer to Figure 1 , Figures 10-13 On the basis of example one, the device for preparing styrene further comprises a condenser 3 arranged in the condensing section. The condenser 3 has an outer shell 31 with a hollow columnar structure, and the outer shell 31 is internally provided with a condensing part 32 having a condensing base body 33 with a hollow structure in the shape of a round cake. A plurality of condensing leaf plates 331 are axially connected around the outer side wall of the condensing base body 33, and the condensing leaf plates 331 have a bent plate structure. A gas bag 332 is arranged between adjacent condensing leaf plates 331, and the leaf surface of the condensing leaf plate 331 is fixedly connected with the gas bag 332. An air passage rod 34 is fixedly arranged on the inner bottom surface of the outer shell 31, and one end of the air passage rod 34 penetrates into the interior of the condensing base body 33. The interior of the condensing base body 33 is provided with a gas pipe 333, one end of which is in communication with the gas bag 332, and the other end of the gas pipe 333 is connected with an air pump through the air passage rod 34.

[0052] The device for preparing styrene can accelerate the discharging speed of the condensed liquid phase crude styrene, and can reduce the residue of the crude styrene on the condensing leaf plate 331 after the reaction is completed, and specifically, the gas bag 332 or other pneumatic parts and vibrating parts are arranged between the condensing leaf plates 331, the condensing leaf plate 331 can rotate at a certain angle, and when the condensing leaf plate 331 rotates or vibrates, the liquid phase crude styrene on the condensing leaf plate 331 is affected by inertia, and at the same time, falls to the bottom of the outer shell 31 under the action of gravity, and then is discharged, and the next process is carried out. The crude styrene remaining on the condensing leaf plate 331 after the reaction is completed and before the equipment is stopped can also be collected, and at the same time, the cleanliness of the condenser 3 is improved, and it is difficult to clean and clean because of long-time residue of ethylbenzene, crude styrene and other substances.

[0053] The embodiment three provided by the present application provides:

[0054] Please refer to Figure 1 , Figures 14-17 On the basis of the embodiment one, the device for preparing styrene further comprises a circulating pump 4, and the circulating pump 4 is used for conveying reaction raw materials. The circulating pump 4 has a pump body 41, the pump body 41 has a flow guide chamber 411, one side of the flow guide chamber 411 is provided with an inflow end 42, the other side of the flow guide chamber 411 is provided with an outflow end 43, and the inflow end 42 and the flow guide chamber 411 are communicated through an inflow pipe 44. The flow guide chamber 411 is internally provided with a double-impeller 45, the double-impeller 45 has a rotating shaft 451, and the rotating shaft 451 is shaft-connected to the inner wall of the flow guide chamber 411 through a bearing 452. The double-impeller 45 has an impeller plate 453, one side of the impeller plate 453 has a conical platform structure with a conical surface concave, and the rotating shaft 451 is coaxially arranged through the impeller plate 453. The double-impeller 45 is mirror-symmetrical about the transverse middle section of the impeller plate 453. The rotating shaft 451 located on both sides of the impeller plate 453 is equal in length. The impeller plate 453 is provided with a first blade 454 and a second blade 455, and a plurality of first blades 454 and second blades 455 are circumferentially equidistantly arranged. The first blade 454 and the second blade 455 have a curved plate structure, the thickness of the first blade 454 and the second blade 455 is the same, and the area of the first blade 454 is greater than that of the second blade 455.

[0055] The device for preparing styrene, through the design of the circulating pump 4, on the one hand, when the device is in full load state, the reaction occurs violently, the circulating pump 4 is full of liquid, the preheating section and the reaction section of the device are vertically arranged, and the required lift between the pipelines of the device is high, therefore, the double impeller 45 of the circulating pump 4 is beneficial to the feeding when the device is in full load. On the other hand, the first blade 454 and the second blade 455 with different sizes are arranged on the double impeller 45, which provides different inclination angles, i.e. liquid outlet angles, and the first blade 454 and the second blade 455 also provide larger surface areas to contact with liquid phase ethylbenzene and water, which can increase the circulation rate. On the other hand, when the device is not in full load, the liquid phase ethylbenzene and water in the flow guide chamber 411 only occupy half or less of the space, the first blade 454 and the second blade 455 above the impeller plate 453 are idling, but still can form negative pressure, which increases the circulation rate of the circulating pump 4.

[0056] It will be obvious to a person skilled in the art that, without departing from the spirit or essential characteristics of the application, the present application can be implemented in other specific forms. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claim.

Claims

1. A device for preparing styrene, comprising a preheating section, a reaction section below the preheating section, a condensing section connected to the reaction section, a discharge section connected to the condensing section, and a rectifying tower connected to the discharge section. a preheating member (1) arranged in the preheating section; a catalyst loading member (2) arranged in the reaction section; characterized in that the preheating member (1) has an adiabatic base body (11) with a hollow columnar structure with two open ends, one end of the adiabatic base body (11) is provided with an end cover (111), a feeding pipe (12) is coaxially arranged on the end cover (111), the other end of the adiabatic base body (11) is provided with a discharge cavity (112), a preheating cavity (13) is coaxially arranged in the adiabatic base body (11), the preheating cavity (13) also has a columnar hollow structure with two open ends, one end of the feeding pipe (12) extends into the preheating cavity (13), one end of the feeding pipe (12) is inwardly contracted to form a tapered portion (121), a plurality of distribution through holes (122) are arranged on the tapered portion (121) in the circumferential direction, one end of the preheating cavity (13) is inwardly contracted to form a discharge pipe (14), the diameter of the discharge pipe (14) increases along the discharge direction, the adiabatic base body (11) and the upper end cover (111) are connected by a first connecting flange (15), and the adiabatic base body (11) and the discharge cavity (112) are connected by a second connecting flange (16); the device further comprises a condenser (3) arranged in the condensing section, the condenser (3) has an outer shell (31) with a hollow columnar structure, the outer shell (31) is internally provided with a condensing member (32), the condensing member (32) has a condensing base body (33) with a hollow structure in the shape of a circular disc, a plurality of condensing blade plates (331) are axially arranged on the outer side wall of the condensing base body (33) in the circumferential direction, the condensing blade plates (331) have a bent plate structure, and air bags (332) are arranged between adjacent condensing blade plates (331), the blade surfaces of the condensing blade plates (331) and the air bags (332) are fixedly connected.

2. The apparatus for producing styrene according to claim 1, further comprising a raw material zone, characterized in that: The raw material area is connected to the preheating section through a feeding pipe line, the preheating section is connected with a compressed air pump, a circulating pump is arranged between the raw material area and the preheating section, the circulating pump connects the raw material area and the preheating section through a feeding pipe line, the circulating pump also connects the raw material area and the reaction section through a liquid conveying pipe line, the preheating section and the reaction section are respectively provided with a heater and an armored thermocouple, the reaction section is connected to the condensing section through a gas conveying pipe, and the condensing section is connected to the discharge section through a liquid conveying pipe.

3. A device for producing styrene according to claim 2, characterized in that: The rectifying tower is composed of an ethylene / styrene tower, a toluene / ethylbenzene tower, a toluene / ethylbenzene tower, and a benzene / toluene tower connected in sequence, the discharge section is connected to the ethylene / styrene tower through a liquid conveying pipe, the ethylene / styrene tower is connected to the styrene tower and the toluene / ethylbenzene tower through liquid conveying pipes, and the toluene / ethylbenzene tower is connected to the benzene / toluene tower through a liquid conveying pipe.

4. The apparatus of claim 1, wherein: The catalyst loading piece (2) has a loading base body (21) with a hollow columnar structure with one end open, the outer side wall bottom of the loading base body (21) is provided with a discharge port (211), the axis of the discharge port (211) is obliquely downward, the open end of the loading base body (21) is provided with an upper cover (212), the open end of the loading base body (21) is provided with an annular flange (213), the inside of the loading base body (21) is provided with a main loading plate (22), the inside of the loading base body (21) is provided with a sealing ring (23), the inside of the loading base body (21) is provided with a sieve plate (24), and the inside of the loading base body (21) is provided with a gasket (25).

5. A device for the production of styrene according to claim 4, characterized in that: The inside of the loading base body (21) is provided with a flow guide pipe (26), one end of the flow guide pipe (26) is provided with a flow guide port (261), and the other end of the flow guide pipe (26) penetrates the upper cover (212).

6. A device for the production of styrene according to claim 5, characterized in that: The end of the flow guide pipe (26) penetrating the upper cover (212) is in communication with the discharge pipe (14).

7. A device for producing styrene according to claim 5, characterized in that: The main loading plate (22), the sealing ring (23), the sieve plate (24), the gasket (25) and the flow guide pipe (26) are sequentially arranged coaxially and in parallel with the loading base body (21) from bottom to top.

8. The apparatus for producing styrene according to claim 4, wherein: The discharge port (211) is mirror-symmetrically provided with two about the axial plane of the loading base body (21).

9. The apparatus for producing styrene according to claim 4, wherein: The upper cover (212) is detachably connected to the annular flange (213).

10. The use method of the device for preparing styrene according to claim 3, which steps are as follows: First, compressed air is needed to be introduced by a compressed air pump to check the air tightness of the device and to activate the catalyst in the catalyst loading piece (2) under heating; Then, water vapor is introduced to replace the air in the preheating section and the reaction section, and the reaction needs to be preheated before the reaction and heated during the reaction; Then, ethylbenzene and water are introduced by a circulating pump (4), and the mixed gas after the reaction in the reaction section enters the condensing section to obtain liquid crude styrene, and the uncondensed hydrogen is discharged when it enters the discharge section, and the unreacted raw materials in the reaction section are recycled to the raw material area by the circulating pump; Then, the crude styrene flows into the ethylbenzene / styrene column, and the crude styrene is separated and distilled in the column, the light components of benzene, toluene and ethylbenzene are sent to the toluene / ethylbenzene column, and the heavy components are sent to the styrene rectification column, the crude styrene from the ethylbenzene / styrene column is deeply rectified in the column, the qualified styrene product is distilled from the top of the column, and some heavy components are collected from the bottom of the column; the top product from the ethylbenzene / styrene column is separated and distilled in the toluene / ethylbenzene column, the light components of benzene and toluene are sent to the benzene / toluene column, and the ethylbenzene is collected from the bottom of the column; the benzene / toluene column separates benzene and toluene, and the benzene is distilled from the top of the column, and the toluene is collected from the bottom of the column.

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