Proportioning and mixing equipment for pyrane production and processing

Abstract

The invention relates to the technical field of pyrane production and processing equipment, in particular to proportioning and mixing equipment for pyrane production and processing, which comprises a mixing tank body, a static mixer is arranged on a feed port, an inlet of the static mixer is connected with a precision metering pump, and a viscosity sensor, a central controller and a self-adaptive temperature control stirring assembly are further arranged on the mixing tank body. An inert gas inlet is formed in the top of the mixing tank body, an inert gas flow channel communicated with the inert gas inlet is formed in the stirring shaft, a plurality of gas outlet micropores are formed in the outer surface of the stirring shaft, a telescopic protection sleeve is further arranged in the viscosity sensor, and a sampling and online analysis assembly is connected to the discharging opening. Intelligentization and self-adaption of the production process are achieved, high quality and high yield of products are ensured, precision and high efficiency of the whole production process are achieved, precise control is achieved, reaction efficiency, safety and batch stability are remarkably improved, reliability and durability are high, and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pyran production and processing equipment, in particular to a proportioning and mixing device for pyran production and processing. BACKGROUND

[0002] Pyran and its derivatives are important heterocyclic compounds, which are widely used as key intermediates in the fields of medicine, pesticides, dyes and fine chemicals. The production process usually involves condensation, cyclization and other reactions of multiple liquid raw materials under the action of specific catalysts. These reaction processes are often accompanied by significant changes in material viscosity, heat release effect and reaction rate.

[0003] Most of the existing production of pyran compounds uses conventional kettle reactors combined with mechanical stirring devices. These devices have the following defects:

[0004] (1) The mixing efficiency does not match the reaction progress: traditional stirring equipment usually uses fixed speed or simple phased speed regulation, which cannot respond to the dynamic changes in the rheological properties of the material flow during the reaction. In the early stage of the reaction, the material has low viscosity, and high-speed stirring can easily cause splashing and local overheating. In the middle and later stages of the reaction, with the generation of polymers or high-viscosity intermediates, if the stirring intensity is insufficient, the mass and heat transfer efficiency will decrease sharply, causing uneven reaction, increased by-products, and wide product molecular weight distribution, which seriously affects product quality and yield.

[0005] (2) Insufficient temperature control accuracy: pyran synthesis is usually an exothermic reaction, which requires strict temperature control. The conventional jacketed kettle relies on external circulating bath for simple heating or cooling, and the temperature control method is rough and the response is lagging. It is difficult to achieve precise program temperature control matching the reaction heat release rate, and it is easy to cause side reactions due to local overheating or temperature fluctuations, and even cause safety accidents.

[0006] (3) Inadequate pre-mixing of raw materials: most devices directly mix multiple raw materials into the main reaction kettle. This operation method can easily cause uneven initial contact of raw materials, and local concentration is too high, which produces a large amount of impurities in the initial stage of the reaction, making it difficult for subsequent purification and reducing the purity of the final product.

[0007] No solutions have been proposed to address the related technical problems. SUMMARY

[0008] In view of the problems in the prior art, the present application provides a proportioning and mixing device for pyran production and processing to overcome the above technical problems existing in the prior art, and the purpose of the present application is to realize intelligentization and self-adaptation of the production process, ensure high quality and high yield of the product, achieve precision and high efficiency of the whole production process, realize precise control, significantly improve reaction efficiency, safety and batch stability, solve the problem of mixing dead angle, have high reliability and durability, and reduce maintenance cost.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a proportioning and mixing device for pyran production and processing, comprising a mixing tank, a plurality of feed ports are arranged at the top of the mixing tank, a static mixer is arranged on the feed port, a precision metering pump is connected to the inlet of the static mixer, a discharge port is communicated with the center of the bottom of the mixing tank, a viscosity sensor, a central controller and a self-adaptive temperature control stirring assembly are further arranged on the mixing tank, the viscosity sensor extends into the interior of the mixing tank, the self-adaptive temperature control stirring assembly comprises a stirring motor, a stirring shaft and stirring paddles arranged on the stirring shaft, the stirring shaft is arranged in the interior of the mixing tank, the stirring motor is fixedly installed at the top center of the mixing tank, one end of the top of the stirring shaft penetrates through the mixing tank and extends above the mixing tank, and the tail end is fixedly connected with the output end of the stirring motor, the signal input end of the central controller is connected with the viscosity sensor, and the signal output end of the central controller is connected with the stirring motor.

[0010] Preferably, the self-adaptive temperature control stirring assembly further comprises a jacket, a temperature sensor and a temperature control medium supply unit, the jacket is arranged on the outer wall of the mixing tank, a medium inlet and a medium outlet are arranged on the jacket, the temperature sensor is arranged in the interior of the jacket, and the temperature control medium supply unit is communicated with the medium inlet, and the temperature sensor and the temperature control medium supply unit are respectively connected with the central controller.

[0011] Preferably, the stirring paddles are of a multi-layer combined structure, the stirring paddles comprise a high-shear dispersion disc, a frame-type wall-scraping paddle and a flexible scraper located on one side of the frame-type wall-scraping paddle, the high-shear dispersion disc is located on the outer surface of one end of the bottom of the stirring shaft, and the frame-type wall-scraping paddle is arranged above the high-shear dispersion disc and is fixedly installed on the outer surface of the stirring shaft.

[0012] Preferably, an inert gas inlet is arranged at the top of the mixing tank, the stirring shaft is a hollow shaft, an inert gas flow channel communicated with the inert gas inlet is arranged in the interior of the stirring shaft, a plurality of gas outlet micropores are formed in the outer surface of the stirring shaft, and the gas outlet micropores are located below the high-shear dispersion disc.

[0013] Preferably, the viscosity sensor is internally provided with a retractable protective sleeve, the probe head of the viscosity sensor is arranged in the protective sleeve, and the protective sleeve is connected with the central controller.

[0014] Preferably, the discharge port is connected with a sampling and online analysis assembly.

[0015] Preferably, the sampling and online analysis assembly comprises a branch sampling pipe, a sampling valve, a micro filter and an online spectrum analyzer, the branch sampling pipe is in communication with the discharge port, the sampling valve and the micro filter are arranged on the branch sampling pipe, the branch sampling pipe is in communication with the online spectrum analyzer, and the online spectrum analyzer is signal-connected with the central controller.

[0016] Preferably, the surfaces of the mixing tank body, the stirring shaft and the stirring paddle are coated with a fluoropolymer coating.

[0017] Preferably, the precision metering pump is signal-connected with the central controller.

[0018] Preferably, the bottom end of the mixing tank body is arranged in a decreasing manner from top to bottom.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] (1) The present application is a proportioning and mixing device for pyran production and processing, which is provided with a viscosity sensor connected with a central controller, so as to realize real-time monitoring of the dynamic change of the viscosity of the material in the reaction process and automatic adjustment of the rotating speed of the stirring motor, thereby avoiding problems such as excessively wide molecular weight distribution and increased by-products caused by uneven stirring, ensuring high purity and high yield of the pyran product, and stabilizing the product quality;

[0021] (2) The present application is a proportioning and mixing device for pyran production and processing, which is provided with a self-adaptive temperature control stirring assembly, so as to realize precise programmed temperature rising and falling control of the reaction, quickly respond to temperature fluctuations caused by reaction heat release and the like, prevent local overheating, effectively inhibit side reactions and rapid temperature rise risks caused by temperature loss of control, ensure production safety, ensure the reaction to proceed at the best rate, shorten batch production time, and improve production efficiency;

[0022] (3) The present application is a proportioning and mixing device for pyran production and processing, which adopts multi-layer combined stirring paddles, which have both high-speed shearing and low-speed wall scraping functions, the high-shearing dispersion disc can efficiently break and disperse solid catalysts or high-viscosity materials, and the frame-type wall scraping paddle can promote overall axial circulation and continuously scrape off wall adherents through flexible scrapers, thereby eliminating thermal resistance, ensuring heat transfer efficiency, and avoiding material scaling and coking;

[0023] (4) The present application is a kind of pyran production and processing ratio mixing equipment, by setting inert gas inlet, inert gas flow and outlet micro hole, realize the inert gas from the outlet micro hole of stirring shaft bottom release, form gas-liquid collaborative stirring, for the oxygen sensitive pyran reaction provides oxygen-free protection environment, while the tiny bubble rising process greatly strengthens the micro mixing and mass transfer efficiency, is favorable for the reaction step involving gas, further promote the uniformity and completeness of reaction;

[0024] (5) The present application is a kind of pyran production and processing ratio mixing equipment, by setting sampling and online analysis component on the discharge port, can carry out real-time or intermittent component analysis for reaction liquid, provides the chemical component data except physical parameter for central controller, can more accurately judge reaction progress, even realize the automatic judgment and early intervention of reaction end point, reduce human error, ensure the consistency between batches;

[0025] (6) The present application is a kind of pyran production and processing ratio mixing equipment, by setting telescopic protection sleeve, can effectively protect the detection head of precise viscosity sensor, make it not be damaged in violent stirring and cleaning process, prolong the service life of viscosity sensor, ensure the long-term reliability of data, at the same time, the surface of mixing tank, stirring shaft and stirring paddle is coated with fluoropolymer coating, greatly improves the corrosion resistance of equipment, and prevents material adhesion by using its low surface energy characteristics, makes cleaning more thorough, maintenance is more simple. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure diagram of the present application front view section;

[0027] Figure 2 It is the structure diagram of the mixing tank of the present application. BRIEF DESCRIPTION OF DRAWINGS:

[0029] 1, mixing tank;2, feed inlet;3, static mixer;4, discharge port;5, viscosity sensor;6, central controller;7, stirring motor;8, stirring shaft;9, stirring paddle;91, high shear dispersion disc;92, frame type wall scraping paddle;93, flexible scraper;10, jacket;1001, medium inlet;1002, medium outlet;11, temperature sensor;12, temperature control medium supply unit;13, inert gas inlet;14, outlet micro hole;15, protection sleeve;16, online spectrum analyzer;17, branch sampling tube;18, sampling valve;19, micro filter. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0031] EMBODIMENT

[0032] As shown in the Figures 1-2 As shown in the, the present application provides a technical scheme of a mixing device for pyran production and processing: a mixing device for pyran production and processing, comprising a mixing tank 1, a plurality of feed ports 2 are arranged on the top of the mixing tank 1, a static mixer 3 is arranged on the feed port 2, a precision metering pump is connected to the inlet of the static mixer 3, specifically, the precision metering pump is signal connected with a central controller 6, for accurately conveying liquid raw materials to the static mixer 3 according to the preset ratio; a discharge port 4 is communicated at the bottom center of the mixing tank 1, and a viscosity sensor 5, a central controller 6 and a self-adaptive temperature control stirring assembly are further arranged on the mixing tank 1, the viscosity sensor 5 extends to the inside of the mixing tank 1, specifically, the viscosity sensor 5 is used for real-time monitoring the viscosity change of the material in the mixing tank 1; the self-adaptive temperature control stirring assembly comprises a stirring motor 7, a stirring shaft 8 and a stirring paddle 9 arranged on the stirring shaft 8, the stirring shaft 8 is arranged in the inside of the mixing tank 1, the stirring motor 7 is fixedly installed at the top center of the mixing tank 1, one end of the top of the stirring shaft 8 penetrates through the mixing tank 1 and extends above the mixing tank 1, and the tail end is fixedly connected with the output end of the stirring motor 7, the signal input end of the central controller 6 is connected with the viscosity sensor 5, and the signal output end of the central controller 6 is connected with the stirring motor 7, specifically, the stirring motor 7 is a servo motor or a variable frequency motor, starting the stirring motor 7 can drive the stirring shaft 8 fixedly connected therewith to rotate, and the stirring shaft 8 drives the stirring paddle 9 connected therewith to rotate synchronously when rotating, so as to stir and mix the material in the mixing tank 1; the central controller 6 can receive real-time viscosity data of the viscosity sensor, and compare it with a preset viscosity and stirring shaft 8 speed relationship curve, so as to dynamically adjust the speed of the stirring motor 7, so as to realize the matching of the stirring rate and the material reaction state.

[0033] As shown in the Figure 1 As shown in the, further, the self-adaptive temperature control stirring assembly further comprises a jacket 10, a temperature sensor 11 and a temperature control medium supply unit 12, the jacket 10 is arranged on the outer wall of the mixing tank 1, a medium inlet 1001 and a medium outlet 1002 are arranged on the jacket 10, the temperature sensor 11 is arranged in the inside of the jacket 10, and the temperature control medium supply unit 12 is communicated with the medium inlet 1001, and the temperature sensor 11 and the temperature control medium supply unit 12 are signal connected with the central controller 6 respectively.

[0034] In this embodiment, the temperature-controlled medium supply unit 12 is a prior art mold temperature controller, a standardized industrial device. The basic components (circulating pump, heater, heat exchanger, storage tank, controller) and working principle (controlling the temperature of the target equipment through circulating heat transfer fluid) of the temperature-controlled medium supply unit 12 are well-known and publicly available technologies. The temperature-controlled medium supply unit 12 is connected to the viscosity sensor 5, the central controller 6, and the stirring motor 7 via signals, forming a closed-loop, multivariable coupled intelligent control system. The central controller 6 controls the temperature-controlled medium supply unit 12 based on the feedback from the temperature sensor 11 and the preset process temperature curve to perform programmed heating and cooling control on the material in the mixing tank 1. When the real-time viscosity deviates from the preset range, the central controller 6 synchronously adjusts the speed of the stirring motor 7 and the medium temperature of the temperature-controlled medium supply unit 9 to coordinately regulate the rheological properties and reaction kinetics of the material.

[0035] Please see Figure 1 As shown, the stirring blade 9 is a multi-layer composite structure. The stirring blade 9 includes a high-shear dispersion disk 91, a frame-type wall scraper 92, and a flexible scraper 93 located on one side of the frame-type wall scraper 92. The high-shear dispersion disk 91 is located on the outer surface of one end of the bottom of the stirring shaft 8. The frame-type wall scraper 92 is arranged above the high-shear dispersion disk 91 and is fixedly installed on the outer surface of the stirring shaft 8.

[0036] In this embodiment, the high-shear dispersion disk 91 is used to crush and initially disperse solid catalysts or high-viscosity raw materials at high speeds, and the flexible scraper 93 on the frame-type scraper blade 92 is used to promote overall mass transfer at low speeds and prevent materials from scaling on the inner wall of the mixing tank 1.

[0037] Please see Figure 1 As shown, the mixing tank 1 is further provided with an inert gas inlet 13 at the top, the stirring shaft 8 is a hollow shaft, the inside of the stirring shaft 8 is provided with an inert gas flow channel communicating with the inert gas inlet 13, and the outer surface of the stirring shaft 8 is provided with a number of gas outlet microholes 14, which are located below the high shear dispersion disk 91.

[0038] In this embodiment, the inert gas inlet 13 and the stirring shaft 8 are stably connected using existing technology, so that the rotation of the stirring shaft 8 will not affect the entry of inert gas; the inert gas enters the inert gas channel of the stirring shaft 8 through the inert gas inlet 13 and is discharged through the gas outlet microhole 14, realizing the uniform bubbling of inert gas from the bottom of the reactant material upwards, forming a gas-liquid synergistic stirring effect with mechanical stirring.

[0039] Please see Figure 1As shown, further, the inside of the viscosity sensor 5 is also provided with a retractable protective sleeve 15, the probe head of the viscosity sensor 5 is arranged in the inside of the protective sleeve 15, and the protective sleeve 15 is connected with the central controller 6.

[0040] In the embodiment, the protective sleeve 15 adopts the prior art, is a retractable protective sleeve, is a mechanical protection device, is widely applied in the industrial field, and the basic principle and structure are known; the protective sleeve 15 is controlled by the central controller 6, is retracted to avoid the high shear mixing zone in the non-detection period, and is extended to immerse the probe head of the viscosity sensor 5 in the material to be detected in the detection period.

[0041] As shown in the figure, Figure 1 As shown, further, the discharge port 4 is connected with a sampling and online analysis assembly.

[0042] As shown in the figure, Figure 1 As shown, further, the sampling and online analysis assembly comprises a branch sampling pipe 17, a sampling valve 18, a micro filter 19 and an online spectrum analyzer 16, the branch sampling pipe 17 is communicated with the discharge port 4, the sampling valve 18 and the micro filter 19 are arranged on the branch sampling pipe 17, the branch sampling pipe 17 is communicated with the online spectrum analyzer 16, and the online spectrum analyzer 16 is signal-connected with the central controller 6.

[0043] In the embodiment, the concentration of a key intermediate or product in the reaction liquid is analyzed in real time, and the viscosity data are used as the basis for adjusting the stirring and temperature control parameters of the central controller 6.

[0044] Further, the surfaces of the mixing tank body 1, the stirring shaft 8 and the stirring paddle 9 are coated with a fluoropolymer coating.

[0045] In the embodiment, the corrosion resistance of the equipment is greatly improved, the low surface energy characteristics are used to prevent material adhesion, cleaning is more thorough, and maintenance is more convenient.

[0046] Further, the precision metering pump is signal-connected with the central controller 6.

[0047] As shown in the figure, Figures 1-2 As shown, further, one end of the bottom of the mixing tank body 1 is arranged in a decreasing manner from top to bottom.

[0048] In the embodiment, the mixed material is discharged, and convenience is improved.

[0049] The working principle of the application is as follows:

[0050] First step: accurate metering and premixing of raw materials

[0051] The central controller 6 sends instructions to each precision metering pump according to the preset product formula, and the multiple liquid raw materials are accurately and proportionally delivered to the static mixer 3 through the precision metering pump. The raw materials are fully premixed in the static mixer 3 to form a uniform mixture, which enters the mixing tank 1 through the feed port 2, thereby ensuring the uniformity of the reaction initiator from the source and avoiding local over-concentration.

[0052] Second step: initialization of reaction environment and intelligent start

[0053] At the same time of the material entering, the central controller 6 starts the self-adaptive temperature control stirring assembly and inert gas protection. The stirring motor 7 drives the stirring shaft 8 and the multi-layer combined stirring paddle 9 to start rotating, preliminarily mixes the material, and the inert gas is introduced from the inert gas inlet 13, flows through the flow channel inside the stirring shaft 8, and is finally released in the form of micro-bubbles from the air outlet micro-pores 14. The inert gas provides an oxygen-free environment for the system and enhances the mass transfer gas-liquid collaborative stirring while stirring. The temperature control medium supply unit 12 starts to work. According to the feedback of the temperature sensor 11 and the preset process temperature curve, the heating medium or cooling medium is introduced into the jacket 10, so that the temperature of the material quickly reaches and stabilizes at the initial reaction temperature.

[0054] Third step: self-adaptive reaction control based on real-time feedback

[0055] After the reaction starts, the core control cycle is entered:

[0056] The viscosity sensor 5 is protected by the protection sleeve 15 and measures according to the program. The viscosity data of the material is transmitted to the central controller 6 in real time. At the same time, the online spectrum analyzer 16 intermittently or continuously samples and analyzes the reaction liquid through the branch sampling pipe 17 to obtain the concentration data of the key components. The central controller 6 receives the viscosity, temperature and spectrum data, and compares and analyzes them with the built-in preset process model such as the viscosity-speed relationship curve and the process temperature curve. If the viscosity increases, the central controller 6 will instruct the stirring motor 7 to reduce the speed. At the same time, the central controller 6 will instruct the temperature control medium supply unit 12 to dynamically adjust the temperature and flow of the medium according to the reaction heat release or process requirements, so as to realize the programmed temperature rise and fall. When the viscosity and temperature data indicate that the reaction is abnormal, the controller will synchronously adjust the stirring speed and the medium temperature to implement the viscosity-temperature coupling collaborative control.

[0057] Fourth step: reaction endpoint judgment and discharge

[0058] When the online spectrum analyzer 16 detects that the concentration of the target product reaches the preset value and the reading of the viscosity sensor 5 stabilizes within the endpoint range, the central controller 6 determines that the reaction has reached the endpoint. The central controller 6 stops stirring and temperature control, and opens the discharge port 4. Since the bottom of the mixing tank 1 is designed in a decreasing conical shape, the material can be completely and smoothly discharged under the action of gravity to enter the next process.

[0059] Fifth step: Equipment preparation and cleaning

[0060] After the discharge is completed, the cleaning solvent can be introduced. The central controller 6 can start the agitation and jacket heating, and use the anti-sticking property of the fluoropolymer coating to achieve efficient and thorough online cleaning, and prepare for the next production batch.

[0061] In the description of the present application, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0062] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwed" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, and those skilled in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0063] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A mixing and proportioning device for pyran production and processing, characterized in that, The system includes a mixing tank (1), with several feed inlets (2) at the top. A static mixer (3) is installed on each feed inlet (2), and a precision metering pump is connected to the inlet of the static mixer (3). A discharge outlet (4) is connected to the center of the bottom of the mixing tank (1). The mixing tank (1) is also equipped with a viscosity sensor (5), a central controller (6), and an adaptive temperature control stirring assembly. The viscosity sensor (5) extends into the interior of the mixing tank (1). The adaptive temperature control stirring assembly includes a stirring motor (7). The mixing tank (1) is equipped with a stirring shaft (8) and a stirring blade (9) on the stirring shaft (8). The stirring shaft (8) is located inside the mixing tank (1). The stirring motor (7) is fixedly installed at the top center of the mixing tank (1). One end of the top of the stirring shaft (8) passes through the mixing tank (1) and extends to the top of the mixing tank (1), and the end is fixedly connected to the output end of the stirring motor (7). The signal input end of the central controller (6) is connected to the viscosity sensor (5), and the signal output end of the central controller (6) is connected to the stirring motor (7).

2. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The adaptive temperature control stirring assembly also includes a jacket (10), a temperature sensor (11), and a temperature control medium supply unit (12). The jacket (10) is disposed on the outer wall of the mixing tank (1). The jacket (10) is provided with a medium inlet (1001) and a medium outlet (1002). The temperature sensor (11) is disposed inside the jacket (10). The temperature control medium supply unit (12) is connected to the medium inlet (1001). The temperature sensor (11) and the temperature control medium supply unit (12) are respectively connected to the central controller (6) via signals.

3. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The stirring blade (9) is a multi-layer composite structure. The stirring blade (9) includes a high shear dispersion disk (91), a frame-type wall scraper (92), and a flexible scraper (93) located on one side of the frame-type wall scraper (92). The high shear dispersion disk (91) is located on the outer surface of one end of the bottom of the stirring shaft (8). The frame-type wall scraper (92) is arranged above the high shear dispersion disk (91) and is fixedly installed on the outer surface of the stirring shaft (8).

4. The pyran production and processing mixing equipment according to claim 3, characterized in that, The mixing tank (1) is provided with an inert gas inlet (13) at the top. The stirring shaft (8) is a hollow shaft. The interior of the stirring shaft (8) is provided with an inert gas flow channel that communicates with the inert gas inlet (13). The outer surface of the stirring shaft (8) is provided with a number of gas outlet microholes (14). The gas outlet microholes (14) are located below the high shear dispersion disk (91).

5. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The viscosity sensor (5) is also provided with a retractable protective sleeve (15), and the probe of the viscosity sensor (5) is located inside the protective sleeve (15). The protective sleeve (15) is connected to the central controller (6).

6. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The discharge port (4) is connected to a sampling and online analysis component.

7. The mixing and proportioning equipment for pyran production and processing according to claim 6, characterized in that, The sampling and online analysis component includes a branch sampling tube (17), a sampling valve (18), a micro filter (19), and an online spectrometer (16). The branch sampling tube (17) is connected to the discharge port (4). The sampling valve (18) and the micro filter (19) are both installed on the branch sampling tube (17). The branch sampling tube (17) is connected to the online spectrometer (16). The online spectrometer (16) is connected to the central controller (6) via signal.

8. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The surfaces of the mixing tank (1), stirring shaft (8) and stirring blades (9) are all coated with a fluoropolymer coating.

9. The mixing and proportioning equipment for pyran production and processing according to claim 1, characterized in that, The precision metering pump is connected to the central controller (6) via signal.

10. A mixing and proportioning device for pyran production and processing according to claim 1, characterized in that, The bottom of the mixing tank (1) is arranged in a decreasing manner from top to bottom.

Images