CN113680302A

CN113680302A - Reaction device for preparing ethylbenzene hydroperoxide

Info

Publication number: CN113680302A
Application number: CN202110919281.0A
Authority: CN
Inventors: 蒋平; 薛宽荣; 陈松炜; 卢荣贵; 宋广杰
Original assignee: Zhejiang Zhiying Petrochemical Technology Co ltd
Current assignee: Zhejiang Zhiying Petrochemical Technology Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-11-23
Anticipated expiration: 2041-08-11
Also published as: CN113680302B

Abstract

The utility model relates to a reaction unit for preparing ethylbenzene hydrogen peroxide, reaction unit is including a plurality of reactors of establishing ties in proper order, the reactor includes the reactor body and with the blast pipe and the subassembly that admits air of reactor body intercommunication, the opening has all been seted up at reactor body both ends, the opening of a plurality of reactors communicates in proper order, this internal multiunit radial baffle that all is provided with of reactor, it is fixed with one side that the reactor body is close to ground to have a radial baffle one side in every group radial baffle at least, the direction overhang on another side direction is kept away from ground, and it is fixed with one side that the reactor body is kept away from ground to have a radial baffle one side at least, the direction overhang on another side direction is close to ground, and the projection part coincidence of two radial baffle of vertical direction is followed, along the material flow direction, this internal radial baffle quantity of reactor reduces in proper order. The radial baffle plate is arranged to achieve the purpose of improving the yield of the ethylbenzene hydroperoxide.

Description

Reaction device for preparing ethylbenzene hydroperoxide

Technical Field

The application relates to the field of styrene production, in particular to a reaction device for preparing ethylbenzene hydroperoxide.

Background

In the styrene/propylene oxide coproduction process, ethylbenzene is used as a raw material and reacts with air to prepare an intermediate product ethylbenzene hydroperoxide, the intermediate product ethylbenzene hydroperoxide is concentrated and subjected to epoxidation reaction with propylene to generate propylene oxide and a-phenylethyl alcohol, and the refined a-phenylethyl alcohol is dehydrated to generate styrene.

In the related art, as shown in fig. 1, a reactor 100 for ethylbenzene hydroperoxide includes a reactor body 200, an air inlet pipe 270 and an air outlet pipe 280 which are communicated with the reactor body 200. Both ends of the reactor body 200 are opened. Ethylbenzene is introduced into the reactor 100 through an ethylbenzene inlet pipe, and air is introduced into the reactor 100 through an air inlet pipe 410 and contacts with ethylbenzene, so that the air reacts with the ethylbenzene to obtain ethylbenzene hydroperoxide. Excess gases and vaporized ethylbenzene from the reaction are removed from exhaust 300.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the reactor is adopted, the yield of the ethylbenzene hydroperoxide is lower.

Disclosure of Invention

In order to improve the yield of the ethylbenzene hydroperoxide, the application provides a reaction device for preparing the ethylbenzene hydroperoxide.

The application provides a reaction unit for preparing ethylbenzene hydroperoxide, relates to following technical scheme:

the utility model provides a reaction unit for preparing ethylbenzene hydrogen peroxide, includes a plurality of reactors that establish ties in proper order, the reactor includes reactor body and blast pipe and the subassembly that admits air that communicates with the reactor body, the opening has all been seted up at reactor body both ends, and the opening of a plurality of reactors communicates in proper order, this internal multiunit radial baffle that all is provided with of reactor, it is fixed with one side that the reactor body is close to ground that there is at least one radial baffle one side in every group radial baffle, and the direction overhang on another side far away from ground just has at least one radial baffle one side to be fixed with one side that the reactor body is far away from ground, and the direction overhang on another side near ground, and the projection part coincidence of two radial baffles along vertical direction, along the material flow direction, this internal radial baffle quantity of reactor reduces in proper order.

By adopting the technical scheme, the radial baffle plate delays the flowing speed of the material, so that the mixing time of the ethylbenzene and the air is prolonged, the oxygen amount of ethylbenzene contact is increased, and the aim of increasing the yield of ethylbenzene hydroperoxide is fulfilled.

Optionally, the air inlet assembly comprises an air inlet pipe and an air inlet coil pipe, one end of the air inlet pipe is communicated with the air inlet coil pipe, the other end of the air inlet pipe is communicated with the air pumping device, the air inlet coil pipe is located below the liquid level in the reactor, and the air inlet coil pipe is provided with a plurality of air inlets.

By adopting the technical scheme, air is pumped into the air inlet pipe under the action of the air pumping device and overflows from the air inlet hole after passing through the air inlet coil pipe, so that the contact between the air and the ethylbenzene is realized.

Optionally, the air inlet holes are arranged obliquely downwards.

By adopting the technical scheme, the air inlet holes which are inclined downwards prolong the path of the air flowing out of the air inlet holes, thereby prolonging the contact time of the air and the ethylbenzene and realizing the purpose of improving the utilization rate of the oxygen in the air.

Optionally, the gas inlet assembly comprises a gas inlet pipe and a plurality of gas inlet plates, the gas inlet pipe is rotatably connected with the side wall of the reactor body, a cavity communicated with the gas inlet pipe is formed in the gas inlet plates, gas inlet holes communicated with the cavity are formed in the gas inlet plates, and the gas inlet holes are located on the same side of the corresponding gas inlet plates along the rotating direction of the gas inlet pipes.

By adopting the technical scheme, the air overflows from the air adding holes, so that the air adding plate drives the air adding pipe to rotate, the air is added into the ethylbenzene while the ethylbenzene is stirred by the air adding plate, the uniform mixing degree of the ethylbenzene and the air is improved, and the yield of the ethylbenzene hydroperoxide is further improved.

Optionally, the reactor is fixedly connected with a bearing plate and a connecting plate, the bearing plate is axially arranged along the connecting plate, the bearing plate and the connecting plate are arranged at intervals to form an annular gap therebetween, the gas filling pipe penetrates out of the gap and is connected with the gas filling plate, and the gas filling pipe is connected with the bearing plate and the connecting plate through a driving assembly to drive the gas filling pipe to move along the length direction of the gap.

Through adopting above-mentioned technical scheme, drive assembly's setting makes the air entrainment pipe remove along clearance length direction to the homogeneous degree of mixing of air and ethylbenzene has further been improved.

Optionally, the gas filling pipe is including connecting the daughter pipe and many gas filling daughter pipes, reactor body is worn out to connect daughter pipe one end and is used for and pump gas device intercommunication, the connecting the daughter pipe other end rotates with the gas filling daughter pipe to be connected, and the two intercommunication, the gas filling daughter pipe is connected with the gas filling board, drive assembly includes drive plate, drive gear, drive ring gear and a plurality of drive tooth, and the drive plate slides along clearance length direction and loading board and connecting plate and is connected, drive gear rotates with the drive plate to be connected, and drive gear and gas filling daughter pipe coaxial coupling, the drive ring gear rotates with the drive plate to with drive gear engagement, it is a plurality of drive tooth sets gradually along clearance length direction, just drive ring gear with drive tooth meshing.

Through adopting above-mentioned technical scheme, the gas filling board rotates to make drive gear rotate, drive the ring gear promptly and rotate, finally make the drive ring gear drive the drive plate and make the gas filling sub-pipe remove along clearance length direction under the drive tooth effect.

Optionally, the gas filling sub-pipe is connected with the driving gear in a sliding mode along the axial direction of the gas filling sub-pipe, and the driving plate is provided with an adjusting assembly used for adjusting the sliding distance of the gas filling sub-pipe.

By adopting the technical scheme, the adjusting assembly is controlled, so that the air-entrapping sub-pipe slides along the axial direction of the air-entrapping sub-pipe and the driving gear, and the mixing uniformity of air and ethylbenzene is further improved.

Optionally, the adjusting assembly comprises an adjusting screw and an adjusting gear, the adjusting gear is rotatably connected with the drive plate, the adjusting gear is meshed with the drive gear, the adjusting screw is a reciprocating screw, a sliding block of the adjusting screw is coaxially and fixedly connected with the adjusting gear, and the adjusting screw is connected with the connecting sub-pipe.

Through adopting above-mentioned technical scheme, drive gear rotates under the effect of drive son pipe to drive adjusting gear and rotate, because the drive plate is difficult for removing, consequently adjust the lead screw and slide under the adjusting gear effect, remove with the drive connection son pipe.

In summary, the present application includes at least one of the following advantageous technical effects:

1. the arrangement of the radial baffle delays the flowing speed of the materials, so that the mixing time of the ethylbenzene and the air is prolonged, the oxygen amount of ethylbenzene contact is increased, and the aim of increasing the yield of ethylbenzene hydroperoxide is fulfilled;

2. the gas adding plate is arranged, so that the gas adding plate drives the gas adding pipe to rotate, the gas adding plate injects air into ethylbenzene and simultaneously stirs the ethylbenzene in the reactor body, and the aim of improving the uniformity of the ethylbenzene and air mixing is fulfilled.

Drawings

FIG. 1 is a drawing of the related art;

FIG. 2 is a schematic overall structure diagram of a first embodiment of the present application;

FIG. 3 is a schematic overall structure diagram of a second embodiment of the present application;

FIG. 4 is a partial cross-sectional view of an air induction assembly according to a second embodiment;

FIG. 5 is a partial schematic view of a second embodiment of the present application;

fig. 6 is an enlarged schematic view of a portion a in fig. 5.

Description of reference numerals: 100. a reactor; 200. a reactor body; 210. an opening; 230. a carrier plate; 231. a ring groove; 240. a connecting plate; 250. a gap; 260. a radial baffle; 270. an air intake duct; 280. an exhaust duct; 300. an exhaust pipe; 400. an air intake assembly; 410. an air inlet pipe; 420. an air intake coil pipe; 421. an air inlet; 430. an air adding pipe; 431. connecting the sub-pipes; 432. adding an air sub-pipe; 433. a limiting block; 440. a gas panel; 441. a cavity; 442. air holes are added; 500. a drive assembly; 510. a drive plate; 520. a drive gear ring; 521. teeth; 530. driving the teeth; 540. a drive gear; 541. a sliding hole; 542. a limiting hole; 600. an adjustment assembly; 610. adjusting the lead screw; 620. an adjusting block; 630. and adjusting the gear.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a reaction unit for preparing ethylbenzene hydroperoxide. Referring to fig. 2, the reaction apparatus includes a plurality of reactors 100 connected in series, and four reactors 100 are provided in this embodiment.

The reactor 100 includes a reactor body 200, a plurality of exhaust pipes 300 and a plurality of sets of air inlet assemblies 400, wherein the exhaust pipes 300 and the air inlet assemblies are all provided with four and are in one-to-one correspondence. The reactor body 200 is horizontally placed on the ground, and the two ends of the reactor body 200 are both provided with openings 210, one of the openings is an ethylbenzene inlet, the other is an ethylbenzene outlet, and the ethylbenzene inlet and the ethylbenzene outlet of the adjacent reactor 100 are communicated.

In order to increase the residence time of the ethylbenzene and the air in the reactor body 200, so as to increase the contact time of the ethylbenzene and the air, and thus increase the conversion rate of the ethylbenzene, a plurality of sets of radial baffles 260 are disposed in the reactor body 200, each set of radial baffles 260 includes a plurality of radial baffles 260, and in this embodiment, each set of radial baffles 260 includes two radial baffles 260 disposed in parallel at intervals. One side of one radial baffle 260 is fixedly connected with the inner wall of the reactor body 200 far away from the ground, the other side extends towards the direction close to the ground, one side of the other radial baffle 260 is fixedly connected with the inner wall of the reactor body 200 near the ground, the other side extends towards the direction far away from the ground, and the projection parts of the two longitudinal baffles 260 along the vertical direction are overlapped.

The exhaust pipes 300 are all communicated with the reactor body 200, the pipe openings of the exhaust pipes 300 close to the reactor body 200 are located above the liquid level in the reactor body 200, the three exhaust pipes 300 close to the ethylbenzene inlet are all located on one side of the corresponding air inlet assembly 400 close to the ethylbenzene inlet, and the last exhaust pipe 300 is located on one side of the corresponding air inlet assembly 400 far away from the ethylbenzene inlet.

The number of radial baffles 260 within the reactor body 200 is sequentially reduced in the direction of material flow to reduce the amount of ethylbenzene hydroperoxide decomposition due to excessive temperatures within the reactor body 200.

The intake assembly 400 includes an intake pipe 410 and an intake coil 420. One end of the air inlet pipe 410 is communicated with the air pumping device through a rotary joint, the other end of the air inlet pipe extends to the position below the liquid level of the reactor body 200 and is communicated with the air inlet coil 420, and a plurality of air inlet holes 421 are formed in the peripheral surface of the air inlet coil 420. The air pumping device of the embodiment is an air pump.

In order to further prolong the contact time between the air and the ethylbenzene and improve the utilization rate of oxygen in the air, the air inlet holes 421 are disposed obliquely downward.

The implementation principle of the embodiment of the application is as follows: ethylbenzene flows in from an ethylbenzene inlet, then slowly flows through a longitudinal baffle 260, and finally flows out from an ethylbenzene outlet; air is discharged from the intake port through the intake coil 420 from the intake pipe 410, thereby mixing the air with ethylbenzene.

Example two

The difference between this embodiment and the first embodiment is: referring to fig. 3 and 4, the intake assembly 400 includes an intake pipe 430 and a plurality of intake plates 440. The gas filling pipe 430 comprises a connector pipe 431 and a plurality of gas filling sub-pipes 432, one end of the connector pipe 431 penetrates through the inner wall of the reactor body 200 to be connected with the gas pumping device, the connector pipe 431 is connected with the gas pumping device through a rotary joint, the rotary joint is located in the reactor body 200, and the other end of the connector pipe 431 is communicated with the plurality of gas filling sub-pipes 432. The number of the gas-adding sub-pipes 432 is the same as that of the gas-adding plates 440, and the gas-adding sub-pipes 432 correspond to the gas-adding plates 440 one by one. In this embodiment, three gas-filling sub-pipes 432 are provided, the three gas-filling sub-pipes 432 are uniformly arranged along the circumferential direction of the connecting sub-pipe 431, one end of each gas-filling sub-pipe 432 is communicated with the connecting sub-pipe 431 through a rotary joint, and the other end of each gas-filling sub-pipe 432 is connected with the corresponding gas-filling plate 440. The gas filling plate 440 is provided with a cavity 441 communicated with the gas filling sub-pipe 432, the gas filling plate 440 is provided with gas filling holes 442 communicated with the cavity 441, the gas filling holes 442 are located on the same side of the corresponding gas filling plate 440 along the rotation direction of the connector sub-pipe 431, so that after the air is sprayed out of the gas filling holes 442, the gas filling plate 440 is driven to rotate the connector sub-pipe 431, the gas filling plate 440 is enabled to stir ethylbenzene, and the mixing uniformity of the ethylbenzene and the air is improved.

In order to increase the stirring range of the gas adding plate 440, a carrying plate 230 and a connecting plate 240 are fixedly connected to the inside of the reactor body 200. The carrier plates 230 are arranged along the circumference of the connecting plate 240, and the carrier plates 230 are spaced apart from the connecting plate 240, so that an annular gap 250 is formed between the carrier plates 230 and the connecting plate 240. Gas injection sub-pipe 432 passes out of gap 250 and is connected to connector sub-pipe 431. The gas injection tube 432 is connected to the carrier plate 230 and the connecting plate 240 by the driving assembly 500 so that the gas injection tube 430 moves along the length of the gap 250.

Referring to fig. 5 and 6, drive assembly 500 includes a drive plate 510, a drive ring gear 520, a plurality of drive gears 540, and a plurality of drive teeth 530. The bearing plate 230 and the connecting plate 240 are both provided with a ring groove 231 along the length direction of the gap 250, the ring groove 231 is a T-shaped groove, the driving plate 510 is fixedly connected with a sliding block connected with the ring groove 231 in a sliding manner, and the sliding block is a T-shaped block. The driving gears 540 correspond to the gas injection sub-pipes 432 one by one, the driving gears 540 are coaxially connected with the corresponding gas injection sub-pipes 432, and the driving gears 540 are rotatably connected with the driving plate 510, so that the gas injection sub-pipes 432 are driven by the gas injection plate 440 to rotate the driving gears 540 relative to the driving plate 510. The driving gear ring 520 is rotatably connected with the driving plate 510, and the driving gear ring 520 is sleeved outside the plurality of driving gears 540 and is meshed with the driving gears 540. The plurality of driving teeth 530 are fixedly coupled to the carrier plate 230 along a circumferential direction of the gap 250, and teeth 521 engaged with the driving teeth 530 are fixedly coupled to an outer circumferential surface of the driving ring gear 520.

The gas panel 440 carries the gas sub-tubes 432 to rotate the drive gear 540 relative to the drive plate 510, such that rotation of the drive ring gear 520 by the drive gear 540 occurs due to the drive ring gear 520 meshing with the drive gear 540 and the drive ring gear 520 being in rotational communication with the drive plate 510. Because the driving gear ring 520 is engaged with the driving teeth 530, the driving gear ring 520 cannot drive the bearing plate 230 to rotate, so that the driving gear ring 520 drives the gas-filling sub-pipe 432 to move along the length direction of the gap 250 under the action of the driving teeth 530.

In order to further stir ethylbenzene and air, a sliding hole 541 is formed in the driving gear 540, the air-entraining sub-pipe 432 is connected with the sliding hole 541 in a sliding mode, in order to enable the air-entraining sub-pipe 432 and the driving gear 540 to be not prone to relative rotation, a limiting block 433 is fixedly connected to the side wall of the air-entraining sub-pipe 432, and a limiting hole 542 for the limiting block 433 to slide is formed in the driving gear 540. And the inner wall of the sliding hole 541 is provided with a limiting hole 542 for the limiting block 433 to slide. An adjusting assembly 600 for adjusting the sliding distance of the gas filling sub-pipe 432 is fixedly connected to the driving plate 510.

The adjusting assembly 600 in this embodiment is specifically configured as follows: the adjusting assembly 600 includes an adjusting screw 610, an adjusting block 620, and an adjusting gear 630, the adjusting gear 630 is rotatably connected to the driving plate 510, and the adjusting gear 630 is located between the plurality of driving gears 540 and engaged with the driving gears 540. The adjusting screw 610 is a reciprocating screw, a sliding block 511 of the reciprocating screw is fixedly connected with the adjusting gear 630, one end of the reciprocating screw is fixedly connected with the adjusting block 620, and the adjusting block 620 is fixedly connected with the connecting sub-pipe 431.

The driving gear 540 rotates, so that the adjusting gear 630 rotates, and the adjusting screw 610 reciprocates under the action of the adjusting gear 630, so as to drive the connecting sub-pipe 431, so that the gas filling sub-pipe 432 and the driving gear 540 perform relative displacement.

The implementation principle of the embodiment of the application is as follows: ethylbenzene flows in from an ethylbenzene inlet, then slowly flows through a longitudinal baffle 260, and finally flows out from an ethylbenzene outlet; the pumping device pumps air from the connection sub-pipe 431 through the air-adding sub-pipe 432 and then fills the air-adding holes 442 into the reactor body 200, thereby mixing ethylbenzene with air.

After the air is sprayed from the air injection holes 442, the air injection plate 440 drives the air injection pipe 430 to rotate, so that the driving gear 540 rotates, and drives the adjusting gear 630 and the driving gear ring 520 to rotate, so that the driving assembly 500 drives the air injection sub-pipe 432 to move along the length direction of the gap 250, and simultaneously, the air injection sub-pipe 432 reciprocates along the axial direction of the air injection sub-pipe.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A reaction device for preparing ethylbenzene hydroperoxide is characterized in that: the reactor comprises a plurality of reactors (100) which are sequentially connected in series, wherein each reactor (100) comprises a reactor body (200), an exhaust pipe (300) and an air inlet assembly (400) which are communicated with the reactor body (200), openings (210) are formed in two ends of the reactor body (200), the openings (210) of the reactors (100) are sequentially communicated, a plurality of groups of radial baffles (260) are arranged in the reactor body (200), one side of at least one radial baffle (260) in each group of radial baffles (260) is fixed with one side, close to the ground, of the reactor body (200), the other side of each radial baffle is suspended from the direction of the ground, one side of at least one radial baffle (260) is fixed with one side, far from the ground, of the reactor body (200), the other side of each radial baffle is suspended from the direction of the ground, projection parts of the two radial baffles (260) in the vertical direction are overlapped, and the material flow direction is followed, the number of radial baffles (260) within the reactor body (200) is sequentially reduced.

2. A reactor device for the production of ethylbenzene hydroperoxide according to claim 1, characterized in that: the air inlet assembly (400) comprises an air inlet pipe (410) and an air inlet coil pipe (420), one end of the air inlet pipe (410) is communicated with the air inlet coil pipe (420), the other end of the air inlet pipe is communicated with an air pumping device, the air inlet coil pipe (420) is located below the liquid level in the reactor body (200), and a plurality of air inlet holes (421) are formed in the air inlet coil pipe (420).

3. A reactor unit for the production of ethylbenzene hydroperoxide according to claim 2, characterized in that: the air inlet holes (421) are obliquely arranged downwards.

4. A reactor device for the production of ethylbenzene hydroperoxide according to claim 1, characterized in that: air inlet assembly (400) include gas filling pipe (430) and polylith gas filling board (440), gas filling pipe (430) rotate with reactor body (200) lateral wall to be connected, gas filling board (440) are last to be seted up with cavity (441) of gas filling pipe (430) intercommunication, gas filling board (440) are last to be seted up with cavity (441) intercommunication add gas pocket (442), follow the direction of rotation of gas filling pipe (430), add gas pocket (442) all lie in the same one side that corresponds gas filling board (440).

5. The reactor apparatus of claim 4, wherein: reactor body (100) internal fixation is connected with loading board (230) and connecting plate (240), loading board (230) set up along connecting plate (240) circumference, and loading board (230) and connecting plate (240) interval set up to make annular clearance (250) form between the two, gas filler pipe (430) are worn out and are connected with gas filler plate (440) from clearance (250), and gas filler pipe (430) are connected with loading board (230) and connecting plate (240) through drive assembly (500), move along clearance (250) length direction in order to drive gas filler pipe (430).

6. The reactor apparatus of claim 5, wherein: the gas filling pipe (430) comprises a connecting sub-pipe (431) and a plurality of gas filling sub-pipes (432), one end of the connecting sub-pipe (431) penetrates through the reactor body (200) and is used for being communicated with a gas pumping device, the other end of the connecting sub-pipe (431) is rotatably connected with the gas filling sub-pipe (432) and is communicated with the gas filling sub-pipe, the gas filling sub-pipe (432) is connected with a gas filling plate (440), the driving assembly (500) comprises a driving plate (510), a driving gear (540), a driving gear ring (520) and a plurality of driving teeth (530), the driving plate (510) is connected with the bearing plate (230) and the connecting plate (240) in a sliding mode along the length direction of a gap (250), the driving gear (540) is rotatably connected with the driving plate (510), the driving gear (540) is coaxially connected with the gas filling sub-pipe (432), the driving gear ring (520) is rotatably connected with the driving plate (510) and is meshed with the driving gear (540), the plurality of driving teeth (530) are sequentially arranged along the length direction of the gap (250), and the driving gear ring (520) is meshed with the driving teeth (530).

7. The reactor apparatus of claim 6, wherein the reaction zone comprises a reaction zone in which the reaction zone is located; the gas-filling sub-pipe (432) is connected with the driving gear (540) in a sliding mode along the axial direction of the gas-filling sub-pipe (432), and the driving plate (510) is provided with an adjusting assembly (600) used for adjusting the sliding distance of the gas-filling sub-pipe (432).

8. The reactor apparatus of claim 7, wherein: the adjusting assembly (600) comprises an adjusting lead screw (610) and an adjusting gear (630), the adjusting gear (630) is rotatably connected with the driving plate (510), the adjusting gear (630) is meshed with the driving gear (540), the adjusting lead screw (610) is a reciprocating lead screw, a sliding block (511) of the adjusting lead screw (610) is coaxially and fixedly connected with the adjusting gear (630), and the adjusting lead screw (610) is connected with the connecting sub-pipe (431).