Catalyst feeding equipment

Abstract

The invention discloses catalyst feeding equipment. A buffer is used for buffering a catalyst; a first inlet of the online mixer is communicated with the buffer through a connecting pipe, a first meter is mounted on the connecting pipe, and a second inlet of the online mixer is communicated with a feeding pipe for supplying reaction raw materials; the inlet of the reactor is communicated with the outlet of the online mixer; an inlet of the condensing system is communicated with an outlet of the reactor, a liquid phase outlet of the condensing system is used for discharging glycolide, and a gas phase outlet of the condensing system is used for discharging gas; and a driving pipe of the gas-phase driving unit is connected between the outlet of the condensing system and the third inlet of the on-line mixer so as to realize gas-phase circulation. According to the catalyst feeding equipment, the adding amount of the catalyst is accurately controlled, the catalytic effect of the catalyst is improved, the catalyst and circulating gas are added into the reactor while being mixed, the production efficiency is improved, the flow rate of the catalyst is guaranteed through gas conveying, and the situation that the flow rate of the catalyst is too low and an injection pipeline is blocked is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of coal chemical industry, and in particular to a catalyst feeding device. Background Art

[0002] A catalyst is a substance that can increase the rate of a chemical reaction without changing the chemical equilibrium, and its mass and chemical properties do not change before and after the chemical reaction. Adding an appropriate amount of catalyst to promote the reaction is one of the important steps in chemical production and is also a chemical production process that is widely used in the chemical industry.

[0003] Generally, the reactor is divided into the following three types according to the feeding method of different types of catalysts: fixed bed catalytic reactor, fluidized bed catalytic reactor, and suspended catalytic reactor. In a fixed bed catalytic reactor, the catalyst is usually loaded using a spherical, annular or rod-shaped particle filler, and the reaction occurs on the catalyst surface. The fluidized bed catalytic reactor uses a fluidization process in the device, and the catalyst appears in a granular form in the reactor, and the purpose is achieved through a fluidized motion form. In a suspended catalytic reactor, the catalyst is dissolved in the reactants using tiny particles, and the concentration is usually less than one thousandth. The reaction in the reactor occurs on the surface of the catalyst particles, including full mixed suspension, partial mixed suspension, etc. In this state, it is extremely important to control the amount of catalyst added, and the loss of the catalyst will also increase.

[0004] In the actual production process, the catalyst feeding device of the existing suspended catalytic reactor is to put the catalyst and the process medium into the catalyst preparation tank at one time and stir them together, and then add the prepared catalyst liquid into the reactor at once. In this way, the single mixing amount of the catalyst and the process medium is large, which easily causes the process medium and the catalyst to be mixed insufficiently and the proportion is unbalanced, which seriously affects the use effect of the catalyst. In addition, when the prepared liquid is added to the reactor, the reactor needs to stop running, which reduces the production efficiency. Summary of the invention

[0005] The purpose of the present application is to provide a catalyst feeding device to accurately control the amount of catalyst added and improve the catalytic effect of the catalyst. The catalyst is mixed with the circulating gas while being added to the reactor, and gas transportation is used to ensure the flow rate of the catalyst, thereby improving production efficiency.

[0006] The present application provides a catalyst feeding device, comprising: a buffer for caching catalyst; an online mixer, a first inlet of the online mixer is connected to the buffer through a connecting pipe to receive the catalyst, a first meter is installed on the connecting pipe, a second inlet of the online mixer is connected to a feeding pipe for supplying reaction raw materials, and the catalyst and reaction raw materials are mixed in the online mixer; a reactor, the inlet of the reactor is connected to the outlet of the online mixer; a condensation system, the inlet of the condensation system is connected to the outlet of the reactor, the liquid phase outlet of the condensation system is used to discharge glycolide, and the gas phase outlet of the condensation system is used to discharge gas; a gas phase drive unit, the gas phase drive unit includes a drive pipe and a driver located on the drive pipe, the drive pipe is connected between the outlet of the condensation system and the third inlet of the online mixer, and gas phase circulation is achieved by driving the driver.

[0007] Optionally, the condensation system includes a first condenser and a first gas distributor, the inlet of the first condenser is connected to the outlet of the reactor, the liquid phase outlet of the first condenser is used to discharge glycolide, the gas phase outlet of the first condenser is connected to the inlet of the first gas distributor, the first gas phase outlet of the first gas distributor is connected to the inlet of the drive tube, and the second gas phase outlet of the first gas distributor is used to discharge the remaining gas phase.

[0008] Optionally, the catalyst feeding device further comprises a first vacuum generator, wherein an inlet of the first vacuum generator is connected to the second gas phase outlet of the first gas distributor.

[0009] Optionally, the condensation system includes a second gas distributor and a second condenser, the inlet of the second gas distributor is connected to the outlet of the reactor, the liquid phase outlet of the second gas distributor is connected to the inlet of the reactor, the first gas phase outlet of the second gas distributor is connected to the inlet of the drive tube, the second gas phase outlet of the second gas distributor is connected to the inlet of the second condenser, the liquid phase outlet of the second condenser is used to discharge glycolide, and the gas phase outlet of the second condenser is used to discharge the gas phase.

[0010] Optionally, the catalyst feeding device further comprises a second vacuum generator, and an inlet of the second vacuum generator is connected to a gas phase outlet of the second condenser.

[0011] Optionally, the driver comprises a fan, and the frequency of the fan is adjustable.

[0012] Optionally, the catalyst feeding device includes a controller, a second meter is provided on the feeding pipe, and the controller is communicatively connected with the first meter and the second meter to control the flow of the first meter and the second meter.

[0013] Optionally, the third inlet is located at the bottom of the inline mixer, and an angle between an opening direction of the third inlet and a flow direction of the reaction raw materials is an acute angle.

[0014] Optionally, the first inlet is located at the top of the inline mixer and is equipped with a nozzle, and a mixing element is also provided in the inline mixer.

[0015] Optionally, the mixing element includes at least one of a vortex assembly, a perforated plate and a special-shaped plate.

[0016] The above technical solution has the following beneficial effects:

[0017] The catalyst feeding equipment provided in the present application uses a first meter to accurately control the amount of catalyst added to achieve the purpose of controlling the amount of catalyst added to the online mixer, thereby improving the catalytic effect of the catalyst; the catalyst and the reaction raw materials are mixed in the online mixer and transported to the reactor. The reactor does not need to be shut down during the entire process, which increases production efficiency. Gas-liquid separation is achieved in the condensation system through condensation and other methods. The liquid phase after separation is the reaction product glycolide. The gas phase after separation is circulated through a gas phase drive unit, which not only avoids the introduction of external impurities, but also ensures the catalyst flow rate through gas transportation, avoids the catalyst flow rate being too low to block the injection pipeline, and at the same time improves the utilization rate of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a flow chart of a catalyst feeding device in one embodiment of the present application.

[0019] Figure 2 This is a flow chart of a catalyst feeding device in another embodiment of the present application.

[0020] Reference Numbers

[0021] 1-buffer; 2-online mixer, 20-first inlet, 21-second inlet, 22-third inlet; 3-connecting pipe, 30-first metering device; 4-reactor; 5-condensation system, 50-first condenser, 51-first gas distributor, 52-second condenser, 53-second gas distributor; 6-gas phase drive unit, 60-drive pipe, 61-drive; 7-feed pipe. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a variety of structural modes and implementation modes that can be replaced by those skilled in the art can be replaced with each other. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the invention.

[0024] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0025] The present application provides a catalyst feeding device, comprising: a buffer 1, an online mixer 2, a reactor 4, a condensation system 5 and a gas phase driving unit 6.

[0026] Please refer to Figure 1 to Figure 2 The buffer 1 is used to buffer the catalyst. The first inlet 20 of the inline mixer 2 is connected to the buffer 1 through a connecting pipe 3 to receive the catalyst. The connecting pipe 3 is equipped with a first meter 30. The second inlet 21 of the inline mixer 2 is connected to a feed pipe 7 for supplying reaction raw materials. The catalyst and the reaction raw materials are mixed in the inline mixer 2.

[0027] The online mixer 2 in the embodiment of the present application can be a pipeline mixer, a venturi mixer or other mixers that can achieve mixing while transporting the reaction raw materials. When the online mixer 2 is a pipeline mixer, the materials can be mixed simultaneously during the material transportation process without adding a special mixer or other structure, and the disturbance generated when the materials are transported in the pipeline is used to increase the adequacy of the mixing.

[0028] The first metering device 30 in the embodiment of the present application can be a metering pump or other structure with metering and driving functions. After the first metering device 30 is started, the catalyst is driven to flow into the online mixer 2. At the same time, the amount of catalyst added to the online mixer 2 can be controlled by metering and controlling the flow rate of the catalyst.

[0029] The reactor 4 may be a reaction kettle or other equipment that can be used for material reaction. The inlet of the reactor 4 is connected to the outlet of the inline mixer 2 to receive the reaction raw materials and catalyst delivered by the inline mixer 2 .

[0030] The inlet of the condensation system 5 is connected to the outlet of the reactor 4, the liquid phase outlet of the condensation system 5 is used to discharge glycolide, and the gas phase outlet of the condensation system 5 is used to discharge gas.

[0031] The gas phase driving unit 6 includes a driving tube 60 and a driver 61 located on the driving tube 60 . The driving tube 60 is connected between the outlet of the condensation system 5 and the third inlet 22 of the online mixer 2 . The gas phase circulation is achieved by driving the driver 61 .

[0032] The catalyst feeding equipment provided in the embodiment of the present application uses a first metering device 30 to accurately control the amount of catalyst added to achieve the purpose of controlling the amount of catalyst added to the online mixer 2, thereby improving the catalytic effect of the catalyst; the catalyst and the reaction raw materials are mixed in the online mixer 2 and transported to the reactor 4. The reactor 4 does not need to be shut down during the entire process, thereby increasing production efficiency. Gas-liquid separation is achieved in the condensation system 5 by condensation and other means. The liquid phase after separation is the reaction product glycolide. The gas phase after separation is circulated through the gas phase drive unit 6, which not only avoids the introduction of external impurities, but also ensures the catalyst flow rate through gas transportation, avoids the catalyst flow rate being too low to block the injection pipeline, and at the same time improves the utilization rate of the catalyst.

[0033] In an alternative embodiment of the condensation system 5, as Figure 1 As shown, the condensation system 5 includes a first condenser 50 and a first gas distributor 51, the inlet of the first condenser 50 is connected to the outlet of the reactor 4, the liquid phase outlet of the first condenser 50 is used to discharge glycolide, the gas phase outlet of the first condenser 50 is connected to the inlet of the first gas distributor 51, the first gas phase outlet of the first gas distributor 51 is connected to the inlet of the driving tube 60, and the second gas phase outlet of the first gas distributor 51 is used to discharge the gas phase. In this embodiment, the first gas distributor 51 is located downstream of the first condenser 50, and the outlet of the reactor 4 is located at the top of the reactor 4. The gas phase is discharged from the outlet of the reactor 4 and enters the first condenser 50 for condensation. The condensed liquid phase is glycolide, which is discharged through the liquid phase outlet at the bottom of the first condenser 50. The gas phase in the first condenser 50 is discharged from the side of the first condenser 50 and enters the first gas distributor 51. A part of the gas phase in the first gas distributor 51 enters the driving tube from the first gas phase outlet under the action of the pressure difference, and the remaining gas phase is discharged from the second gas phase outlet to maintain the pressure stability of the system.

[0034] Based on the above embodiments, Figure 1As shown, the catalyst feeding device further includes a first vacuum generator, the inlet of which is connected to the second gas phase outlet of the first gas distributor 51. The first vacuum generator establishes a vacuum environment, drives the gas phase in the reactor 4 to the first condenser 50, and the condensed liquid product glycolide is discharged from the liquid phase outlet at the bottom of the first condenser 50. The gas phase is sent to the first gas distributor 51 under the action of the vacuum environment, wherein the remaining gas in the first gas distributor 51 that does not enter the driving pipe 60 is accelerated to be discharged from the second gas phase outlet under the action of the first vacuum generator, so as to further maintain the pressure stability of the system.

[0035] In another optional embodiment of the condensation system 5, the condensation system 5 includes a second gas distributor 53 and a second condenser 52, the inlet of the second gas distributor 53 is connected to the outlet of the reactor 4, the liquid phase outlet of the second gas distributor 53 is connected to the inlet of the reactor 4, the first gas phase outlet and the second gas phase outlet of the second gas distributor 53 are both located at the top of the second gas distributor 53, the first gas phase outlet of the second gas distributor 53 is connected to the inlet of the drive tube 60, the second gas phase outlet of the second gas distributor 53 is connected to the inlet of the second condenser 52, the liquid phase outlet of the second condenser 52 is used to discharge glycolide, and the gas phase outlet of the second condenser 52 is used to discharge the gas phase. Figure 2 As shown, in this embodiment, the second gas distributor 53 is located upstream of the second condenser 52, and the outlet of the reactor 4 is located at the top of the reactor 4. After the gas phase is discharged from the outlet of the reactor 4, it enters the second gas distributor 53 for gas-liquid separation. The liquid capture net provided in the second gas distributor 53 captures the liquid phase catalyst carried in the gas phase, and the liquid phase catalyst is discharged from the bottom of the second gas distributor 53 to the top of the reactor 4 to catalyze the reaction again. The first gas phase inlet of the second gas distributor 53 is connected to the drive tube 60, and the gas phase is driven by the driver 61 to circulate and enter the online mixer 2 to mix with the reaction raw materials again for catalytic reaction. The second gas phase outlet of the second gas distributor 53 is connected to the gas inlet of the second condenser 52, and part of the gas phase is condensed in the second condenser 52 to produce the liquid phase product glycolide, and the remaining gas phase is discharged from one side of the second condenser 52.

[0036] Based on the above embodiments, Figure 2As shown, the catalyst feeding device also includes a second vacuum generator, and the inlet of the second vacuum generator is connected to the gas phase outlet of the second condenser 52. The second vacuum generator in the embodiment of the present application establishes a vacuum environment, cooperates with the gas phase circulating in the catalyst feeding device, and sends the gas phase in the reactor 4 to the second gas distributor 53, and the separated liquid phase catalyst enters the reactor 4 again for catalytic reaction, and the gas phase continues to enter the drive tube 60 and the second condenser 52 respectively under the drive of the second vacuum generator and the driver 61. The liquid phase condensed in the second condenser 52 is glycolide, and the remaining gas phase is discharged from the second condenser 52 and sent to the subsequent process by the second vacuum generator.

[0037] In an optional embodiment of the driver 61, the driver 61 includes a fan, and the frequency of the fan is adjustable. The fan in the embodiment of the present application generates a pressure difference in the driving tube 60, controls the flow direction of the gas phase in the driving tube 60, and drives the catalyst separated from the first gas distributor 51 and the second gas distributor 53 back to the online mixer 2 for catalytic reaction. In addition, by adjusting the frequency of the fan, the flow rate of the gas phase can also be adjusted to ensure the gas-liquid separation efficiency of the first gas distributor 51 and the second gas distributor 53. For the first gas distributor 51, it can also prevent the liquid phase catalyst from accumulating at the bottom and causing the first gas distributor 51 to be blocked.

[0038] The present application controls the ratio of catalyst to reaction raw materials through the following optional implementation method, the catalyst feeding device includes a controller, and a second meter is provided on the feed pipe 7, and the controller is connected to the first meter 30 and the second meter in communication to control the flow of the first meter 30 and the second meter. In the embodiment of the present application, the second meter can be a metering pump or other metering drive unit, and the opening of the first meter 30 and the second meter is controlled by the controller to accurately control the ratio of reaction raw materials to catalyst and improve the use effect of the catalyst.

[0039] As an optional embodiment, the third inlet 22 is located at the bottom of the inline mixer 2, and the angle between the opening direction of the third inlet 22 and the flow direction of the reaction raw materials is an acute angle. In the embodiment of the present application, the opening direction of the third inlet 22 is inclined, and its lateral sub-direction is consistent with the flow direction of the reaction raw materials, and it is arranged upward in the vertical sub-direction to lift the reaction raw materials at the bottom of the inline mixer 2, increase the mixing effect between the catalyst and the reaction raw materials, and prevent the reaction raw materials from being deposited at the bottom of the inline mixer 2.

[0040] As an optional embodiment, the first inlet 20 is located at the top of the inline mixer 2 and is equipped with a nozzle, and a mixing element is also provided in the inline mixer 2. The nozzle in the embodiment of the present application can increase the speed of the catalyst spraying into the inline mixer 2, improve the mixing effect between the catalyst and the reaction raw materials, and the mixing element provided in the inline mixer 2 is conducive to further increasing the mixing effect between the catalyst and the reaction raw materials.

[0041] As an optional embodiment, the mixing element includes at least one of a vortex assembly, an orifice plate and a special-shaped plate. The vortex assembly may include a rotating shaft extending along the axial direction of the online mixer 2, and two groups of arc blades arranged on the rotating shaft along the axial direction, each group of arc blades is multiple (4, 6, 8, etc.), and is evenly arranged along the circumference of the rotating shaft, and the bending directions of the two groups of arc blades are opposite, so that the catalyst and the reaction raw materials flow in a zigzag manner in the online mixer 2, forming a vortex shape, thereby improving the mixing efficiency. The orifice plate is a plate-like open hole structure with the bottom installed at the bottom of the online mixer 2 and the top inclined toward the flow direction of the reaction raw materials, which plays the role of drainage and throttling. The catalyst and the reaction raw materials pass through the orifice plate through the openings on the orifice plate and are mixed in the process. The special-shaped plate can be a plate-like structure installed on the rotating shaft of the online mixer 2 and having a storage bin. The storage bin can be a conical bin. The bin mouth of the conical bin is opposite to the flow direction of the reaction raw materials. The side openings of the conical bin are convenient for the entry of the reaction raw materials. The bottom wall of the conical bin is inclined. During the rotation of the rotating shaft, part of the reaction raw materials enter the storage bin from the side openings and slide downward under the guidance of the inclined bottom wall. In this process, mixing of the reaction raw materials and the catalyst is achieved.

[0042] Based on the above embodiment, the in-line mixer 2 generally adopts a method of three sections of pipelines connected as a unit to increase the mixing effect of the catalyst and the reaction raw materials. The nozzle and the mixing element are arranged in a section of pipeline located at the front end of the process.

[0043] As an optional embodiment, the first inlet 20, the second inlet 21, and the third inlet 22 of the online mixer 2 are all connected to the external pipeline through a flexible interface and the outlet is connected to the external pipeline through a flexible pipeline to allow the online mixer 2 to be displaced and rotated to a certain extent relative to the external pipeline. The online mixer 2 is equipped with an oscillator or a driver 61 that drives the online mixer 2 to rotate within a preset angle to further increase the mixing uniformity between the reaction raw materials and the catalyst in the online mixer 2. As needed, the above technical solutions can be combined to achieve the best technical effect.

[0044] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of the present invention, which should also be considered as the protection scope of the present invention.

Claims

1. A catalyst feeding device, characterized in that: include: A cache, used to cache the catalyst; An inline mixer, wherein a first inlet of the inline mixer is connected to the buffer through a connecting pipe to receive the catalyst, a first meter is installed on the connecting pipe, a second inlet of the inline mixer is connected to a feed pipe for supplying reaction raw materials, and the catalyst and reaction raw materials are mixed in the inline mixer; A reactor, wherein the inlet of the reactor is connected to the outlet of the inline mixer; A condensation system, wherein the inlet of the condensation system is connected to the outlet of the reactor, the liquid phase outlet of the condensation system is used to discharge glycolide, and the gas phase outlet of the condensation system is used to discharge gas; A gas phase driving unit, the gas phase driving unit includes a driving tube and a driver located on the driving tube, the driving tube is connected between the outlet of the condensation system and the third inlet of the online mixer, and gas phase circulation is achieved by driving the driver.

2. The catalyst feeding device according to claim 1, characterized in that: The condensation system includes a first condenser and a first gas distributor. The inlet of the first condenser is connected to the outlet of the reactor, the liquid phase outlet of the first condenser is used to discharge glycolide, the gas phase outlet of the first condenser is connected to the inlet of the first gas distributor, the first gas phase outlet of the first gas distributor is connected to the inlet of the drive tube, and the second gas phase outlet of the first gas distributor is used to discharge the remaining gas phase.

3. The catalyst feeding device according to claim 2, characterized in that: The catalyst feeding device further includes a first vacuum generator, wherein an inlet of the first vacuum generator is connected to a second gas phase outlet of the first gas distributor.

4. The catalyst feeding device according to claim 1, characterized in that: The condensation system includes a second gas distributor and a second condenser, the inlet of the second gas distributor is connected to the outlet of the reactor, the liquid phase outlet of the second gas distributor is connected to the inlet of the reactor, the first gas phase outlet of the second gas distributor is connected to the inlet of the drive tube, the second gas phase outlet of the second gas distributor is connected to the inlet of the second condenser, the liquid phase outlet of the second condenser is used to discharge glycolide, and the gas phase outlet of the second condenser is used to discharge the gas phase.

5. The catalyst feeding device according to claim 4, characterized in that The catalyst feeding device further comprises a second vacuum generator, the inlet of the second vacuum generator is connected to the gas phase outlet of the second condenser.

6. The catalyst feeding device according to claim 1, characterized in that: The driver comprises a fan, and the frequency of the fan is adjustable.

7. The catalyst feeding device according to claim 1, characterized in that: The catalyst feeding device includes a controller. A second meter is arranged on the feeding pipe. The controller is in communication connection with the first meter and the second meter to control the flow of the first meter and the second meter.

8. The catalyst feeding device according to claim 1, characterized in that: The third inlet is located at the bottom of the inline mixer, and the angle between the opening direction of the third inlet and the flow direction of the reaction raw materials is an acute angle.

9. The catalyst feeding device according to claim 1, characterized in that: The first inlet is located at the top of the inline mixer and is equipped with a nozzle. A mixing element is also arranged in the inline mixer.

10. The catalyst feeding device according to claim 9, characterized in that The mixing element includes at least one of a vortex assembly, a perforated plate and a shaped plate.

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