Organic silicone oil cyclic siloxane microwave reinforced catalytic cracking reaction device

Abstract

The utility model discloses a kind of organic silicone oil cyclic siloxane microwave reinforced catalytic cracking reaction device, the organic silicone oil cyclic siloxane microwave reinforced catalytic cracking reaction device includes raw material tank, liquid pump, atomizer, air inlet tank, cracking reactor and condenser;The cracking reactor includes tank body;Mixed component is located at the feed inlet of the tank body;And gaseous distribution component, catalytic component, heating component, separation component are sequentially arranged from bottom to top in the tank body interior, to solve the cracking efficiency problem generated by high viscosity in the market organic silicone oil into cracking reaction device.

Description

Technical Field

[0001] This application relates to the field of organosilicon oil treatment technology, and more specifically, to a microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes. Background Technology

[0002] Organosilicon compounds, with their unique chemical stability, high-temperature resistance, corrosion resistance, and low toxicity, have found widespread application in numerous fields such as cosmetics, pharmaceuticals, construction, coatings, plastics, rubber, textiles, electronics, and aerospace. Silicone oil, as an important member of the organosilicon compound family, is typically a linear polysiloxane product that remains liquid at room temperature, and is divided into two categories: methyl silicone oil and modified silicone oil. Silicone oil, represented by polydimethylsiloxane, often involves complex processes in its preparation. Cyclic siloxanes, as key intermediates, are crucial for improving silicone oil production efficiency and reducing costs.

[0003] For example, the utility model with publication number CN211800687U describes a device for stabilizing the operation of an organosilicon hydrolysate pyrolysis reactor, comprising: a catalyst delivery pump, a hydrolysate delivery pump, a heater, a separator, a mixture inlet, a pyrolysis reactor, a separated liquid outlet, a gas phase outlet, a condenser, a light component recovery tank, a pyrolysis washing tank, and a vacuum device. The hydrolysate delivery pump is connected to the heater, the heater is connected to the mixture inlet at the top of the separator, and the catalyst delivery pump is connected to the mixture inlet. The pyrolysis reactor is connected to the separated liquid outlet at the bottom of the separator. The oil-gas phase outlet at the top of the separator is connected to the condenser inlet, the light component recovery tank is connected to the condenser outlet, the pyrolysis washing tank is connected to the outlet of the light component recovery tank, and the vacuum device is connected to the light component recovery tank. This device can remove more than 90% of the water and more than 50% of the light components from the hydrolysate, improve the reaction effect of the hydrolysate in the pyrolysis reactor, and reduce the load on the pyrolysis reactor. However, it still has the following problems. Organosilicon oils typically have high viscosity. When high-viscosity silicone oils enter the equipment, they are difficult to form a uniform dispersion system, resulting in limited contact area with the catalyst. This severely restricts the efficiency of the pyrolysis reaction. During the reaction, due to the high mass transfer resistance of high-viscosity silicone oils, the heating methods of traditional equipment are difficult to achieve uniform heat transfer.

[0004] Therefore, it is necessary for the inventors to design a new microwave-enhanced catalytic cracking reaction device for organosilicon oil cyclic siloxanes to overcome the above problems. Summary of the Invention

[0005] The main purpose of this application is to provide a microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes, so as to solve the problem of cracking efficiency caused by the high viscosity of organosilicon oil entering the cracking reaction device.

[0006] To achieve the above objectives, this application provides a microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes, including a raw material tank, a liquid pump, an atomizer, an air inlet tank, a cracking reactor, and a condenser; the cracking reactor includes a tank body; a mixing component located at the feed inlet of the tank body; and a gas distribution component, a catalytic component, a heating component, and a separation component arranged sequentially from bottom to top inside the tank body.

[0007] Optionally, the raw material tank is connected to the atomizer via a liquid pump, the mixing assembly is connected to the atomizer and the air inlet tank via pipes, and the condenser is connected to the outlet of the pyrolysis reactor via a pipe.

[0008] Optionally, the mixing assembly includes: a mixer communicating with the feed inlet of the tank; a liquid inlet chamber opened inside the mixer, the liquid inlet chamber communicating with the atomizer; an air inlet chamber opened inside the mixer, the air inlet chamber communicating with the air inlet tank; and a mixing chamber opened inside the mixer communicating with the air inlet chamber and the liquid inlet chamber, the mixing chamber communicating with the inside of the tank.

[0009] Optionally, the gaseous distribution component includes: a flow divider plate disposed at the lower interior of the tank; a plurality of through holes formed through the flow divider plate; a mounting ring for supporting the flow divider plate and adapted thereto; and a connector capable of fixing the mounting ring.

[0010] Optionally, the plurality of through holes are evenly spaced in a ring, and the outer periphery of the diverter plate is inclined; the inner periphery of the mounting ring is inclined to match the outer periphery of the diverter plate.

[0011] Optionally, the catalytic assembly includes: a catalytic bed disposed inside the tank and above the gas distribution assembly; a support grid for supporting the catalytic bed; a support ring fixed to the inner wall of the tank for supporting the support grid; and a porous cover plate disposed above the catalytic bed.

[0012] Optionally, the catalytic bed includes: a lower bed at the bottom; a middle bed on the lower bed; and an upper bed on the middle bed; the lower bed, middle bed, and upper bed are each provided with SiC rods for microwave absorption.

[0013] Optionally, the heating assembly includes: a mounting housing fixedly sleeved on the outer annular surface of the tank; and a plurality of microwave heaters disposed inside the mounting housing, the microwave heaters being used to heat the catalytic assembly.

[0014] Optionally, a plurality of the microwave heaters are arranged in a ring at intervals, and the irradiation angle of the microwave heaters on the catalytic component is 10-30 degrees.

[0015] Optionally, the separation component is a cyclone separator.

[0016] The present invention provides a microwave-enhanced catalytic cracking reaction device for organosilicon oil cyclic siloxanes. Compared with the prior art, its advantages are as follows: the atomizer atomizes high-viscosity silicone oil into droplets, solving the problem of poor fluidity. Then, in conjunction with the mixing component, gas distribution component, catalytic component and separation component, it ensures that the raw materials are in uniform contact with the catalyst. The layered catalytic bed and microwave heating work together to improve the reaction efficiency, and the cyclone separator reduces catalyst loss. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is the overall flowchart of this utility model; Figure 2 This is a cross-sectional view of the pyrolysis reactor of this utility model; Figure 3 This is a structural diagram of the catalytic component of this utility model; Figure 4 This is a top view of the gaseous distribution component of this utility model; Figure 5 This is a structural diagram of the heating component of this utility model; Figure 6 This is a cross-sectional view of the hybrid component of this utility model.

[0018] The components include: 1. Raw material tank; 2. Liquid pump; 3. Atomizer; 4. Air inlet tank; 5. Cracking reactor; 51. Mixer; 511. Liquid inlet chamber; 512. Air inlet chamber; 513. Mixing chamber; 52. Diverter plate; 521. Through hole; 522. Mounting ring; 523. Connector; 53. Catalytic bed; 531. Lower bed; 532. Middle bed; 533. Upper bed; 534. Support grid; 535. Support ring; 536. Porous cover plate; 54. Mounting shell; 541. Microwave heater; 55. Separation assembly; 6. Condenser. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first," "second," etc., used in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] In addition, the term "multiple" should mean two or more.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 6 As shown, a microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes includes a raw material tank 1, a liquid pump 2, an atomizer 3, an air inlet tank 4, a cracking reactor 5, and a condenser 6. The raw material tank 1 stores high-viscosity organosilicon oil and is connected to the atomizer 3 via the liquid pump 2. The liquid pump is preferably a gear pump or a screw pump, suitable for transporting high-viscosity fluids. The flow rate of the liquid pump 2 can be adjusted by a PLC control system to ensure a stable supply of raw materials. The air inlet tank 4 stores nitrogen or inert gas.

[0026] Atomizer 3 is preferably an ultrasonic atomizer, which atomizes high-viscosity silicone oil into droplets, solving its poor flowability problem. The outlet of atomizer 3 is connected to the mixing component of pyrolysis reactor 5 through a pipeline, and the air inlet tank 4 is also connected to the mixing component through a pipeline. The carrier gas flow rate is controlled by a mass flow meter to form a uniform gas-liquid mixture with the atomized silicone oil.

[0027] The outlet of the pyrolysis reactor 5 is connected to the condenser 6 via a pipe, preferably a serpentine condenser tube, and the cooling medium is an ethanol solution, which is used to condense the gaseous cyclic siloxane into a liquid product. The bottom of the condenser 6 is equipped with a product collection tank and the top is connected to a tail gas treatment device.

[0028] The mixing assembly is located at the inlet of the tank and includes a mixer 51, a liquid inlet chamber 511, an air inlet chamber 512, and a mixing chamber 513. The liquid inlet chamber 511 is connected to the atomizer 3, and the air inlet chamber 512 is connected to the air inlet tank 4. The two flow together in the mixing chamber 513. The mixing chamber 513 is equipped with spiral guide vanes made of polytetrafluoroethylene, which is resistant to silicone oil corrosion, so that the gas-liquid mixture is fully mixed during rotation, solving the problem of uneven material dispersion in traditional devices.

[0029] The mixing component can be a Venturi mixer, which uses the negative pressure generated by the high-speed flow of carrier gas to draw in and mix atomized silicone oil, suitable for high-flow scenarios; or a porous baffle can be set in the mixing chamber 513 to enhance the mixing effect through multiple impacts.

[0030] The gas distribution assembly is located inside the lower part of the tank and includes a flow divider 52, through holes 521, a mounting ring 522, and a connector 523. The flow divider 52 is made of ceramic and has 20-50 through holes 521 evenly distributed in a ring on its surface to ensure that the gas-liquid mixture enters the catalytic zone uniformly. The outer peripheral bevel of the flow divider 52 is adapted to the inner peripheral bevel of the mounting ring 522, allowing the flow divider 52 to be installed by placement, facilitating disassembly and cleaning. The connector 523 secures the mounting ring.

[0031] The gaseous distribution component can be made of porous metal sintered plate with a porosity of 30-50%, which is suitable for high-pressure scenarios; or a guide cone can be added below the flow divider 52 to guide the airflow to gather towards the center and then disperse, reducing the wall effect.

[0032] The catalytic assembly, located above the gas distribution assembly, includes a catalytic bed 53, a support grid 534, a support ring 535, and a porous cover plate 536. The support ring 535 is welded to the inner wall of the tank, and the support grid 534 is placed on the support ring 535 to support the catalytic bed 53. The catalytic bed 53 adopts a layered design: the lower bed 531 is filled with a SiC support supporting ZnO catalyst, the middle bed 532 is filled with Hβ molecular sieves, and the upper bed 533 is filled with MgO-ZnO composite oxide. SiC rods are inserted into each layer to enhance microwave absorption efficiency. The porous cover plate 536 covers the catalytic bed 53 to prevent the catalyst from being carried out by the gas flow.

[0033] The catalytic assembly can be configured with a fluidized bed structure, with the catalytic bed 53 filled with catalyst particles, forming a fluidized state through the bottom gas distribution plate, suitable for continuous processing of high-viscosity silicone oil; adopting a drawer-type installation structure, the catalytic bed 53 is designed as a detachable drawer, connected to the inner wall of the tank via a slide rail, facilitating quick catalyst replacement and reducing downtime; the catalytic bed 53 can use a honeycomb ceramic carrier, with a catalyst coating inside the pores to enhance the gas-solid contact area.

[0034] The heating assembly includes a mounting housing 54 and microwave heaters 541. The mounting housing 54 is fixedly fitted onto the outer circumferential surface of the tank and filled with insulation cotton. Six to eight microwave heaters 541 are evenly distributed inside the housing in a ring-shaped, spaced-apart configuration, with an irradiation angle of 15° to ensure that microwave energy is concentrated on the catalytic bed 53. A quartz glass isolation window is provided between the microwave heaters 541 and the outer wall of the tank to prevent gas leakage from the reactor.

[0035] The heating component can use a low-frequency microwave heater, which is suitable for large reactors with a diameter > 50cm, and improves the energy penetration depth; an infrared heating auxiliary device is used to supplement the heat on the basis of microwave heating, which is suitable for the low-temperature start-up stage.

[0036] The separation component 55 is a cyclone separator located above the catalytic component. Its air inlet is connected to the inside of the tank to separate the catalyst particles entrained in the gas flow. The particles return to the catalytic bed 53 through the bottom return pipe, and the purified gaseous products enter the condenser 6 from the top outlet.

[0037] The separation component 55 can adopt a two-stage separation structure, with the first stage being a cyclone separator and the second stage being a wire mesh demister to further remove fine particles; or it can adopt a filter-type separator with a ceramic membrane filter element, which is suitable for high-precision separation scenarios.

[0038] The workflow is as follows: High-viscosity silicone oil is transported from raw material tank 1 to atomizer 3 via liquid pump 2 and atomized into tiny droplets. The atomized silicone oil and carrier gas from air inlet tank 4 are fully mixed in the mixing component and then uniformly enter the catalytic zone through the gas distribution component. The mixed gas flow passes through the catalytic bed 53, and under the action of microwave heater 541, silicone oil molecules are cracked into cyclic siloxanes under the action of the catalyst. After the reaction product is separated by separation component 55 to remove catalyst particles, it enters condenser 6 to be condensed into liquid. The uncondensed carrier gas is discharged after tail gas treatment, and the unreacted silicone oil can be returned to raw material tank 1 for recycling through the return pipe.

[0039] This device solves the dispersion problem of high-viscosity silicone oil through an atomizer, while the mixing component and gas distribution component ensure uniform contact between the raw materials and the catalyst. The layered catalytic bed and microwave heating work together to improve reaction efficiency, and the cyclone separator reduces catalyst loss.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes, characterized in that: It includes a raw material tank (1), a liquid pump (2), an atomizer (3), an air inlet tank (4), a pyrolysis reactor (5), and a condenser (6); the pyrolysis reactor (5) includes a tank body; a mixing component located at the feed inlet of the tank body; and a gas distribution component, a catalytic component, a heating component, and a separation component (55) arranged sequentially from bottom to top inside the tank body.

2. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The raw material tank (1) is connected to the atomizer (3) via a liquid pump (2), the mixing assembly is connected to the atomizer (3) and the air inlet tank (4) via pipes, and the condenser (6) is connected to the outlet of the pyrolysis reactor (5) via a pipe.

3. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The mixing assembly includes: a mixer (51) communicating with the feed inlet of the tank; a liquid inlet chamber (511) opened inside the mixer (51) and communicating with the atomizer (3); an air inlet chamber (512) opened inside the mixer (51) and communicating with the air inlet tank (4); and a mixing chamber (513) opened inside the mixer (51) and communicating with the air inlet chamber (512) and the liquid inlet chamber (511) and communicating with the inside of the tank.

4. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The gaseous distribution assembly includes: a flow divider (52) disposed at the lower interior of the tank; a plurality of through holes (521) formed through the flow divider (52); a mounting ring (522) for supporting the flow divider (52) and adapted thereto; and a connector (523) capable of fixing the mounting ring (522).

5. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 4, characterized in that: The through holes (521) are evenly spaced in a ring, and the outer periphery of the diverter plate (52) is inclined; the inner periphery of the mounting ring (522) is inclined to match the outer periphery of the diverter plate (52).

6. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The catalytic assembly includes: a catalytic bed (53) disposed inside the tank and above the gas distribution assembly; a support grid (534) for supporting the catalytic bed (53); a support ring (535) fixed to the inner wall of the tank for supporting the support grid (534); and a porous cover plate (536) disposed above the catalytic bed (53).

7. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 6, characterized in that: The catalyst bed (53) includes: a lower bed (531) at the bottom; a middle bed (532) disposed on the lower bed (531); and an upper bed (533) disposed on the middle bed (532); the lower bed (531), the middle bed (532), and the upper bed (533) are all provided with SiC rods for microwave absorption.

8. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The heating assembly includes: a mounting housing (54) fixedly sleeved on the outer annular surface of the tank; and a plurality of microwave heaters (541) disposed inside the mounting housing (54), the microwave heaters (541) being used to heat the catalytic assembly.

9. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 8, characterized in that: The microwave heaters (541) are arranged in a ring at intervals, and the irradiation angle of the microwave heaters (541) on the catalyst component is 10-30 degrees.

10. The microwave-enhanced catalytic cracking device for organosilicon oil cyclic siloxanes as described in claim 1, characterized in that: The separation component (55) is a cyclone separator.

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