A composition production system

Abstract

The invention relates to the technical field of chemical equipment, and discloses a composition production system to achieve the purpose of producing D-pantolactone efficiently and cost-savingly; the main scheme comprises a gas-liquid reaction device, a cyanidation device, a hydrolysis device and a granulation device which are sequentially connected through pipelines; the discharge port of the gas-liquid reaction device is connected to the feed port of the cyanidation device, the discharge port of the cyanidation device is connected to the feed port of the hydrolysis device, and the discharge port of the hydrolysis device is connected to the feed port of the granulation device.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, and in particular to a composition production system. Background Art

[0002] Pantothenic acid, commonly known as vitamin B5, and D-pantoic acid lactone is the precursor of D-pantothenic acid synthesis. At present, D-pantoic acid lactone is produced industrially by chemical methods. The specific process is to use formaldehyde and isobutyraldehyde as starting materials, and obtain DL-pantoic acid lactone through aldehyde condensation, cyanidation and lactonization reactions. DL-pantoic acid lactone can then be obtained after chiral resolution. D-pantoic acid lactone.

[0003] Among them, when formaldehyde and isobutylaldehyde undergo an aldehyde-ketone condensation reaction, the formaldehyde and isobutylaldehyde are usually mixed and then subjected to an aldehyde-ketone condensation reaction in an alkaline environment. Usually, isobutylaldehyde is added first and then formaldehyde is introduced, and then the mixture is heated for reaction. In large-scale production, it takes a lot of time to mix formaldehyde and isobutylaldehyde, and the efficiency is low.

[0004] Secondly, biological enzymes are required for chiral resolution of DL-pantolactone, and stirring is also required to speed up the resolution, and stirring is usually performed with a stirring paddle. However, the enzyme appears as flocs in the reactant solution. When stirring with a stirring paddle, if the stirring force is too large, the enzyme will be dispersed or even inactivated, and the enzyme cannot be collected again after the reaction for reuse. New biological enzymes need to be added during the reaction, which is costly. If the stirring force is too small or the stirring time is too short, the stirring time and stirring effect will be affected. Summary of the invention

[0005] The present invention is intended to provide a composition production system to achieve the purpose of producing D-pantolactone efficiently and cost-effectively.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a composition production system, comprising a gas-liquid reaction device, a cyanidation device, a hydrolysis device and a granulation device connected in sequence through pipelines; the discharge port of the gas-liquid reaction device is connected to the feed port of the cyanidation device, the discharge port of the cyanidation device is connected to the feed port of the hydrolysis device, and the discharge port of the hydrolysis device is connected to the feed port of the granulation device;

[0007] The gas-liquid reaction device comprises a reaction device body, the top and one side of the top of the reaction device body are respectively provided with a gas inlet and a liquid inlet perpendicular to each other, the bottom of the reaction device body is provided with a pointed cone, and the outside of the reaction device body is also provided with a circulation loop, the circulation loop comprises a circulation pump, the liquid inlet end of the circulation pump is communicated with the bottom of the reactor body, and the liquid outlet end of the circulation pump is communicated with the liquid inlet;

[0008] The hydrolysis device comprises a hydrolysis kettle, an aeration plate is arranged at the bottom of the hydrolysis kettle, a plurality of aeration ports are fixedly arranged in the tangential direction of the aeration plate, a propeller is fixed in the middle of the aeration plate, the propeller blades correspond to the aeration ports and can rotate under the drive of the airflow released from the aeration ports;

[0009] The granulation device includes a melting kettle, a conveying pump, a forming tower and a mesh belt conveyor which are arranged in sequence. The melting kettle, the conveying pump and the forming tower are connected by a pipeline. A granulation cylinder is arranged on the top of the forming tower. The granulation cylinder is connected with the conveying pump through a pipeline. A plurality of granulation holes of uniform size are opened at the bottom of the granulation cylinder. A accommodating cavity is opened in the lower part of the forming tower. One end of the mesh belt conveyor is arranged in the accommodating cavity and is located below the granulation cylinder.

[0010] The principles and advantages of this solution are:

[0011] In actual application, a gaseous reactant (formaldehyde) and a liquid reactant (isobutyraldehyde) are introduced into a gas-liquid reaction device. The feed inlets of the two reactants are perpendicular to each other and are in a state of counteraction when introduced. The liquid reactant can absorb more gaseous reactants at this time and can react in the reactor body. At the same time, the set circulation loop can allow the liquid reactant at the bottom to be sprayed out from the liquid inlet again to absorb the gaseous reactants remaining in the container. No stirring device is required in the whole process, and the maintenance cost is lower. At the same time, the two reactants begin to mix when loading, and there is no need to wait until the loading is completed before stirring the reaction, which is more efficient.

[0012] When the hydrolysis device participates in the reaction, the airflow introduced by the aeration plate drives the propeller to rotate, which can generate turbulence, mix the DL-pantoic acid lactone more evenly, and is more conducive to full contact with the enzymes involved in the reaction, thereby improving the hydrolysis efficiency. At the same time, the airflow drives the propeller to rotate in the liquid without generating a large impact force, thereby not dispersing the flocculent biological enzymes or causing them to be inactivated, thereby eliminating the need to add new enzymes in each reaction and reducing costs.

[0013] When the granulating device is in use, solid pantolactone is placed in a melting kettle for melting, and then the molten pantolactone is conveyed to the granulating drum in the forming tower via a conveying pump. In the granulating drum, the molten pantolactone falls in the form of droplets of relatively uniform size under the combined action of gravity and surface tension. During the falling process, the droplets lose heat, solidify and fall onto the mesh belt conveyor. The mesh belt conveyor can facilitate the removal of pantolactone particles whose particle size does not meet the standards, and on the other hand, it is convenient for the transportation and unloading of pantolactone.

[0014] As an improvement, a filter screen is fixedly arranged at the liquid inlet of the reaction device body, a hole-shaped filter plate is also arranged in the reaction device body, a mounting hole is opened in the middle of the funnel-shaped filter plate, the pointed cone extends out of the mounting hole and is fixed to the filter plate, and spikes are evenly distributed on the upper and lower sides of the funnel-shaped filter plate; the beneficial effect of this improvement is that when the reaction liquid is ejected from the liquid outlet, under the action of the filter screen, the reaction liquid can be dispersed to a greater extent in the reaction device body, the contact area with the reaction gas is increased, and the mixing degree and reaction speed of the reactants are improved; when the liquid and gas participating in the reaction enter the reactor body, part of the reaction liquid directly contacts the pointed cone, and the generated bubbles can be removed by the action of the pointed cone, wherein part of the reaction liquid directly contacts the filter plate or flows from the pointed cone to the funnel-shaped filter plate, the funnel-shaped filter plate can delay the flow rate of the reaction liquid, so that the reaction is more sufficient, the spikes on the upper side can better remove the bubbles existing on the upper side of the funnel-shaped filter plate, and the spikes on the lower side can better remove the bubbles existing when the liquid level rises, so that the reaction is more sufficient.

[0015] As an improvement, a first one-way valve is further provided on one side of the liquid inlet of the reaction device body, and a second one-way valve is further connected to the liquid outlet end of the circulation pump, and the second one-way valve is arranged between the first one-way valve and the liquid inlet of the reaction device body; the beneficial effect of this improvement is that when the circulation pump is used to pass the reaction liquid into the reaction device body, backflow may occur, and the one-way valve arranged at the connection of the circulation pump can effectively avoid the backflow phenomenon.

[0016] As an improvement, an aeration pipe is provided at the aeration port, and the aeration pipe is evenly distributed along the tangent direction of the aeration disk, and the pipe mouth direction of the aeration pipe corresponds to the blade surface of the propeller blade; the beneficial effect of this improvement is: when the aeration disk drives the propeller to rotate, since the propeller itself is in the liquid, the hydrolyzed liquid will have a certain weakening and dispersing effect on the airflow, and the setting of the aeration pipe can reduce the weakening effect of the hydrolyzed liquid, which is convenient for better driving the propeller to rotate to form turbulence, and better allowing DL-pantolactone to contact with the biological enzyme, thereby improving the reaction efficiency.

[0017] As an improvement, a shielding tube is also provided at the bottom of the hydrolysis kettle, and the aeration plate is located in the middle of the shielding tube; the beneficial effect of this improvement is: in order to better drive the propeller to rotate in the liquid, the impact force of the airflow may be relatively large, which may disperse the flocculent biological enzymes. The tube arranged on the outside of the aeration plate can withstand the impact force of the gas, thereby preventing the flocculent biological enzymes from being dispersed.

[0018] As an improvement, an aeration fan is arranged outside the hydrolysis kettle, the air outlet end of the aeration fan is connected to the aeration pipe port, and the air inlet end of the aeration fan is connected to the third one-way valve; the bottom and top of the hydrolysis kettle are respectively provided with a second air inlet and an air collecting port, and a gas circulation pipeline is arranged outside the hydrolysis kettle, one end of the gas circulation pipeline is connected to the air collecting port, and the other end of the gas circulation pipeline is connected between the air inlet end of the aeration fan and the third one-way valve; the beneficial effects of this improvement Yes: In order to increase the hydrolysis rate in the hydrolysis kettle, it is usually necessary to keep the reactants in a weak alkaline environment. In this scheme, ammonia is introduced into the second air inlet, and the aeration gas and the ammonia volatilized in the solution enter the gas circulation pipeline from the gas collecting port, and then are brought into the hydrolysis kettle through the aeration fan, so that the solution in the hydrolysis kettle maintains a weak alkaline environment. At the same time, the other end of the gas circulation pipeline is connected between the air inlet end of the aeration fan and the third one-way valve, which can effectively prevent ammonia from leaking and causing air pollution.

[0019] As an improvement, the gas circulation pipeline also includes a pressure-stabilizing circuit, which includes a gas storage tank, the air inlet of the gas storage tank is connected to the gas circulation pipeline on the gas collecting port side, the air outlet of the gas storage tank is connected to the connection between the air inlet end of the aeration fan and the circulation pipeline through a pipeline, and a fourth one-way valve is also connected between the air inlet and the air outlet of the gas storage tank and the connection with the gas circulation pipeline, and an overflow valve is also connected to the side where the air inlet of the gas storage tank is located; the beneficial effect of this improvement is: since the gas is continuously introduced into the hydrolysis kettle, and the setting of the third one-way valve can prevent ammonia from leaking, it also has a certain impact on the exhaust of the device; the pressure-stabilizing circuit connected in the gas circulation pipeline can stabilize the pressure in the device, and when the pressure is too high, the overflow valve will open, and the gas storage tank will absorb and store excess gas to stabilize the pressure; wherein the setting of the fourth one-way valve can prevent the aeration fan from passing gas from the circulation loop into the hydrolysis kettle, affecting the aeration and stirring effects.

[0020] As an improvement, a blower is further provided on the outside of the forming tower, and the air outlet of the blower is connected to the accommodating cavity through a pipe and provides an upward airflow. A vent is also provided at the upper end of the forming tower. The beneficial effect of this improvement is that when the droplets in the forming tower fall and form, the dissipated heat may accumulate, affecting the subsequent forming of the droplets. The setting of the blower can provide an upward airflow and cooperate with the vent to bring the heat out of the forming tower, thereby facilitating the forming of the droplets. At the same time, the airflow will provide lift, slow down the falling time of the droplets, give them more sufficient forming time, and the formed particles will not be damaged when they collide with the mesh belt conveyor after deceleration.

[0021] As an improvement, the bottom of the forming tower is a funnel-shaped collecting port, and the funnel-shaped collecting port is connected to the feed port of the melting kettle; the beneficial effect of this improvement is: the bottom of the forming tower is set to be funnel-shaped, when the particle size of the particles is smaller than the mesh belt holes of the mesh belt conveyor, they will fall from the mesh belt holes into the collecting port, and the funnel shape of the collecting port is convenient for collecting particles with unqualified particle sizes, wherein the collecting port is connected to the feed port of the melting kettle, which is convenient for melting and re-granulating the unqualified particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the composition production system according to an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the structure of a gas-liquid reaction device according to an embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the structure of a hydrolysis device according to an embodiment of the present invention.

[0025] Figure 4 It is a schematic structural diagram of a granulation device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following is further described in detail through specific implementation methods:

[0027] The reference numerals in the drawings of the specification include: gas-liquid reaction device 100, cyanidation device 200, hydrolysis device 300, granulation device 400; reaction device body 101, first gas inlet 102, liquid inlet 103, filter screen 104, funnel-shaped filter plate 105, pointed cone 106, circulation pump 107, first one-way valve 108, second one-way valve 109;

[0028] Hydrolysis kettle 301, aeration plate 302, aeration pipe 303, propeller 304, aeration fan 305, tube 306, second air inlet 307, third one-way valve 308, fourth one-way valve 309, air storage tank 310, overflow valve 311;

[0029] Melting kettle 401 , conveying pump 402 , forming tower 403 , mesh belt conveyor 404 , funnel-shaped collecting port 405 , blower 406 , and granulating cylinder 407 .

[0030] The embodiment is basically as shown in the attached Figure 1 As shown:

[0031] The present invention provides a composition production system, which is mainly used for the production of D-pantoic acid lactone and mainly consists of a gas-liquid reaction device 100, a cyanidation device 200, a hydrolysis device 300 and a granulation device, wherein the gas-liquid reaction device 100 is mainly used for mixing and reacting formaldehyde and isobutyraldehyde to generate hydroxyvaleraldehyde, the cyanidation device 200 is used for cyaniding the generated hydroxyvaleraldehyde to generate DL-pantoic acid lactone, the hydrolysis device is used for chiral separation of the DL-pantoic acid lactone generated after cyanidation to obtain D-pantoic acid lactone, and the granulation device is used for shaping and granulating the D-pantoic acid lactone obtained after the chiral separation.

[0032] Specifically, the discharge port of the gas-liquid reaction device 100 is connected to the feed port of the cyanidation device 200. The cyanidation device 200 is an existing cyanidation device, specifically a device for cyaniding hydroxyvaleraldehyde, which is a prior art and will not be elaborated on here. The discharge port of the cyanidation device 200 is connected to the feed port of the hydrolysis device 300, and the discharge port of the hydrolysis device 300 is connected to the feed port of the granulation device.

[0033] As attached Figure 2 In this embodiment, the gas-liquid reaction device 100 is a reaction device body as a whole, and a first air inlet 102 and a liquid inlet 103 are respectively opened on the top and one side of the top of the reaction device body, wherein the first air inlet 102 and the liquid inlet 103 are perpendicular to each other, the first air inlet 102 is used for the introduction of formaldehyde gas, and the liquid inlet 103 is used for the introduction of isobutyraldehyde. When the two are introduced at the same time, there will be a hedging effect, so that the formaldehyde is absorbed by the isobutyraldehyde liquid.

[0034] During implementation, in order to facilitate the contact between formaldehyde and isobutyraldehyde, a filter screen 104 is welded at the liquid inlet 103. Under the action of the filter screen 104, the isobutyraldehyde liquid is dispersed, which is more convenient for the absorption of formaldehyde gas. A pointed cone 106 is also welded at the bottom of the reaction device body. During implementation, when the mixed liquid of isobutyraldehyde and formaldehyde is released onto the pointed cone 106, the tip of the pointed cone 106 can pierce the larger bubbles in the mixed liquid. When the mixed liquid touches the cone body of the pointed cone 106, it will spread to the surroundings, which is more convenient for contact with unabsorbed formaldehyde and has a better mixed absorption effect. A filter plate is also welded in the reaction device body, and a mounting hole is opened in the middle of the funnel-shaped filter plate 105. A portion of the pointed cone 106 passes through the filter plate and is welded and fixed to the filter plate, so that the fixing strength is higher. The specific filter plate is funnel-shaped. During implementation, the mixed liquid will not completely contact the pointed cone 106, but will also be released into the space around the pointed cone 106. Through the setting of the filter plate, it will directly contact the isobutyraldehyde liquid, so that it can be better dispersed and contacted with the formaldehyde gas for absorption. Setting the filter plate in a funnel shape can slow down the flow rate of the liquid, making it easier to fully contact with the formaldehyde gas and achieving a better mixing effect. The upper and lower sides of the filter plate are integrally formed with spikes, and the setting of the spikes can puncture the bubbles in the reaction device, so that the mixing effect is better and formaldehyde gas is avoided in the bubbles, which affects the reaction efficiency.

[0035] During implementation, in order to better improve the mixing effect of the gas-liquid reaction device 100, a circulation pump 107 is further arranged on the outside of the reaction device body, wherein the liquid inlet end of the circulation pump 107 is connected to the lower end of the reactor body, and the liquid outlet end of the circulation pump 107 is connected to the liquid inlet 103. When the circulation pump 107 transports the liquid in the reactor body to the liquid inlet 103, the mixing pressure with the liquid input is increased, so that the isobutyraldehyde liquid entering the liquid inlet 103 is more evenly dispersed, which is convenient for fully absorbing the formaldehyde gas. The liquid inlet 103 is also equipped with a first one-way valve 108 on the side connected to the liquid outlet end of the circulation pump 107, and the liquid outlet end of the circulation pump 107 is also equipped with a second one-way valve 109; the backflow of the reaction liquid is effectively avoided by the arrangement of the above two one-way valves.

[0036] As attached Figure 3During implementation, the hydrolysis device 300 includes a hydrolysis kettle 301, wherein an aeration plate 302 is fixedly provided at the bottom of the hydrolysis kettle 301, and the specific aeration plate 302 is a metal aeration plate 302, which is welded or fixed to the bottom of the hydrolysis kettle 301 by bolts, and a plurality of aeration ports are integrally formed along the tangent direction of the aeration plate 302, wherein a plurality of aeration pipes 303 are inserted into the aeration ports; specifically, a propeller 304 is also fixed to the middle of the aeration plate 302 by bolts, and specifically, the propeller 304 is located above the aeration pipe 303, and the aeration pipe 303 The direction of the pipe mouth is facing the rotation direction of the blade of the propeller 304; an aeration fan 305 is also provided outside the hydrolysis kettle 301, and the air outlet end of the aeration fan 305 is connected to the aeration port through a pipeline. Specifically, a plurality of three-way or four-way joints can be provided at the air outlet end of the aeration fan 305 to be connected to the aeration port; during implementation, the airflow sent by the aeration fan 305 is transported to the propeller 304 through the aeration pipe 303, and the propeller 304 rotates under the action of the airflow to generate turbulence, so that the DL-pantolactone and the hydrolase are mixed more evenly, and the reaction efficiency will be higher.

[0037] During implementation, a tube 306 is fixed to the outside of the aeration plate 302 by welding. In order to better drive the propeller 304 to rotate in the liquid, the impact force of the aerated airflow may be relatively large, which may disperse the flocculent biological enzyme. The tube 306 arranged on the outside of the aeration plate 302 can withstand the impact force of the gas, thereby preventing the airflow from directly impacting the flocculent biological enzyme. Specifically, the aeration plate 302 is installed in the middle of the tube 306. During actual hydrolysis, the propeller 304 and the airflow will not disperse the flocculent biological enzyme, which is convenient for the recovery and reuse of the biological enzyme, without the need to add new biological enzymes, and the cost is lower; there is no need to install a motor to drive the propeller 304, which further reduces the cost of stirring and hydrolysis.

[0038] During implementation, in order to better improve the hydrolysis efficiency of DL-pantoic acid lactone, a weakly alkaline environment needs to be maintained. In this solution, the hydrolysis kettle 301 is also provided with a second air inlet 307, and the second air inlet 307 is used for the introduction of ammonia. During specific implementation, a pH detector can also be fixedly installed on the outside of the hydrolysis kettle 301 to detect the pH value in the reactor in real time. The amount of ammonia introduced can be determined by observing the pH value to ensure that the hydrolysis kettle 301 is maintained at the optimal pH for hydrolysis.

[0039] During implementation, the introduction of gas into the hydrolysis kettle 301 may cause a pressure increase. Specifically, a gas collecting port is provided on the top of the hydrolysis kettle 301, and a gas circulation pipeline is provided on the outside of the hydrolysis kettle 301, wherein one end of the gas circulation pipeline is connected to the gas collecting port, and the other end of the gas circulation pipeline is connected to the air inlet end of the aeration fan 305; during implementation, in order to avoid leakage of ammonia gas that may exist in the circulation pipeline, a third one-way valve 308 is also connected to the air inlet end of the aeration fan 305; during implementation, In order to balance the pressure of the hydrolysis kettle 301, the gas circulation pipeline is also connected to a pressure stabilizing circuit; the specific pressure stabilizing circuit includes a gas storage tank 310, the gas inlet end of the gas storage tank 310 is connected to the side of the gas circulation pipeline connected to the gas collecting port, and specifically, a relief valve 311 is also connected to the pipeline connecting the gas circulation pipeline and the gas inlet of the gas storage tank 310; the gas outlet of the gas storage tank 310 is connected to the connection position of the gas inlet end of the aeration fan 305 and the circulation pipeline through a pipeline. When implemented, the gas inlet and gas outlet of the gas storage tank 310 are connected to the gas inlet end of the aeration fan 305 and the circulation pipeline. The pipeline between the connection with the gas circulation pipeline is also connected to the fourth non-return valve 309; the aeration gas and the ammonia volatilized in the solution enter the gas circulation pipeline from the gas collecting port, and then are brought into the hydrolysis kettle 301 through the aeration fan 305, so that the solution in the hydrolysis kettle 301 maintains a weak alkaline environment. At the same time, the other end of the gas circulation pipeline is connected between the air inlet end of the aeration fan 305 and the third non-return valve 308, which can effectively prevent the leakage of ammonia and cause air pollution; because the gas is continuously passed The ammonia gas is introduced into the hydrolysis kettle 301, and although the setting of the third one-way valve 308 can prevent the leakage of ammonia, it also has a certain impact on the exhaust of the device; the pressure-stabilizing circuit connected in the gas circulation pipeline can stabilize the pressure in the device. When the pressure is too high, the overflow valve 311 will open, and the gas storage tank 310 will absorb and store the excess gas to stabilize the pressure; the setting of the fourth one-way valve 309 can prevent the aeration fan 305 from passing the gas from the circulation loop into the hydrolysis kettle 301, affecting the aeration and stirring effects.

[0040] As attached Figure 4, when implemented, the granulation device is composed of a melting kettle 401, a delivery pump 402, a forming tower 403 and a mesh belt conveyor 404, wherein the melting kettle 401, the delivery pump 402 and the forming tower 403 are sequentially connected through pipelines. When implemented, a granulation cylinder 407 is welded to the upper section of the forming tower 403 through a connecting frame, a granulation hole is opened at the lower part of the granulation cylinder 407, and the upper part of the granulation cylinder 407 is connected to the output end of the delivery pump 402 through a pipeline; the input end of the delivery pump 402 is connected to the melting kettle 401 through a pipeline; when implemented A accommodating cavity is provided in the middle and lower sections of the forming tower 403, one end of the mesh belt conveyor 404 is placed in the accommodating cavity and is just below the granulating cylinder 407; the lower section of the forming tower 403 is funnel-shaped, which is a funnel-shaped collecting port 405, wherein the funnel-shaped collecting port 405 is communicated with the feed port of the melting kettle 401; during implementation, a blower 406 is also provided on the outside of the forming tower 403, and the air outlet of the blower 406 is connected to the accommodating cavity through a pipeline to provide an upward airflow, and a vent is provided at the upper end of the forming tower 403.

[0041] Specifically, when the granulation device is in use, solid pantolactone is placed in a melting kettle 401 for melting, and then the molten pantolactone is transported to a granulation drum 407 in a forming tower 403 via a delivery pump 402. In the granulation drum 407, the granules fall down in the form of relatively uniform droplets under the combined action of gravity and surface tension. During the falling process, the droplets lose heat, solidify, and fall onto a mesh belt conveyor 404. The mesh belt conveyor 404 can, on the one hand, facilitate the removal of pantolactone particles whose particle sizes do not meet the standards. In addition, on the other hand, it is convenient for the transportation and discharge of pantolactone; when the droplets in the forming tower 403 fall and form, the dissipated heat may accumulate and affect the subsequent forming of the droplets. The setting of the blower 406 can provide an upward airflow, and cooperate with the vent to bring the heat out of the forming tower 403, which is convenient for the forming of the droplets; at the same time, the airflow will provide lift, slow down the falling time of the droplets, so that they have more sufficient forming time, and the formed particles will not be damaged when they collide with the mesh belt conveyor 404 after deceleration.

[0042] The composition production system provided in this scheme can produce D-pantolactone particles efficiently and cost-effectively.

[0043] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A D-pantolactone production system, characterized in that: It comprises a gas-liquid reaction device, a cyanidation device, a hydrolysis device and a granulation device which are sequentially connected by pipelines; the discharge port of the gas-liquid reaction device is connected to the feed port of the cyanidation device, the discharge port of the cyanidation device is connected to the feed port of the hydrolysis device, and the discharge port of the hydrolysis device is connected to the feed port of the granulation device; The gas-liquid reaction device comprises a reaction device body, the top and one side of the top of the reaction device body are respectively provided with a first gas inlet and a liquid inlet perpendicular to each other, the bottom of the reaction device body is provided with a pointed cone, and the outside of the reaction device body is also provided with a circulation loop, the circulation loop comprises a circulation pump, the liquid inlet end of the circulation pump is communicated with the bottom of the reactor body, and the liquid outlet end of the circulation pump is communicated with the liquid inlet; The hydrolysis device comprises a hydrolysis kettle, an aeration plate is arranged at the bottom of the hydrolysis kettle, a plurality of aeration ports are fixedly arranged in the tangential direction of the aeration plate, a propeller is fixed in the middle of the aeration plate, the propeller blades correspond to the aeration ports and can rotate under the drive of the airflow released from the aeration ports; The granulation device comprises a melting kettle, a conveying pump, a forming tower and a mesh belt conveyor which are arranged in sequence, wherein the melting kettle, the conveying pump and the forming tower are connected through a pipeline, a granulation cylinder is arranged on the top of the forming tower, the granulation cylinder is connected with the conveying pump through a pipeline, and a plurality of granulation holes of uniform size are opened at the bottom of the granulation cylinder; an accommodating cavity is opened in the lower part of the forming tower, and one end of the mesh belt conveyor is arranged in the accommodating cavity and is located below the granulation cylinder; A filter screen is fixedly arranged at the liquid inlet of the reaction device body, and a funnel-shaped filter plate is also arranged in the reaction device body, a mounting hole is opened in the middle of the funnel-shaped filter plate, the pointed cone extends out of the mounting hole and is fixed to the funnel-shaped filter plate, and spikes are evenly distributed on the upper and lower sides of the funnel-shaped filter plate; An aeration pipe is arranged at the aeration port, and the aeration pipe is evenly distributed along the tangent direction of the aeration disk. The pipe opening direction of the aeration pipe corresponds to the blade surface of the propeller blade. A shielding tube is also arranged at the bottom of the hydrolysis kettle, and the aeration disk is located in the middle of the shielding tube.

2. The D-pantolactone production system according to claim 1, characterized in that: A first one-way valve is also provided on one side of the liquid inlet of the reaction device body, and a second one-way valve is also connected to the liquid outlet of the circulation pump, and the second one-way valve is provided between the first one-way valve and the liquid inlet of the reaction device body.

3. The D-pantolactone production system according to claim 1, characterized in that: An aeration fan is arranged outside the hydrolysis kettle, the air outlet end of the aeration fan is connected to the aeration pipe port, and the air inlet end of the aeration fan is connected to the third one-way valve; a second air inlet and a gas collecting port are respectively provided at the bottom and top of the hydrolysis kettle, and a gas circulation pipeline is also arranged outside the hydrolysis kettle, one end of the gas circulation pipeline is connected to the gas collecting port, and the other end of the gas circulation pipeline is connected between the air inlet end of the aeration fan and the third one-way valve.

4. The D-pantolactone production system according to claim 3, characterized in that: The gas circulation pipeline also includes a pressure stabilizing circuit, which includes a gas storage tank. The air inlet of the gas storage tank is connected to the gas circulation pipeline on the gas collecting port side, and the air outlet of the gas storage tank is connected to the connection between the air inlet end of the aeration fan and the circulation pipeline through a pipeline. A fourth one-way valve is also connected between the air inlet and air outlet of the gas storage tank and the connection with the gas circulation pipeline, and an overflow valve is also connected to the side where the air inlet of the gas storage tank is located.

5. The D-pantolactone production system according to claim 1, characterized in that: A blower is also arranged outside the forming tower, and an air outlet of the blower is connected to the accommodating cavity through a pipeline to provide an upward airflow; a vent is also provided at the upper end of the forming tower.

6. The D-pantolactone production system according to claim 1, characterized in that: The bottom of the forming tower is a funnel-shaped collecting port, and the funnel-shaped collecting port is communicated with the feed port of the melting kettle.

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