Reaction equipment for producing high-purity phosphorus pentafluoride

Abstract

The utility model relates to reaction equipment for producing high-purity phosphorus pentafluoride. The reaction equipment comprises a jacket reactor, the first-stage condenser and the second-stage condenser are arranged at an air outlet of the jacketed reactor in series, each of the second-stage condenser and the first-stage condenser comprises a condenser body, and the condensation area of each condenser body is divided into a plurality of condensation subareas which are not communicated through even number of second-stage partition plates; one-way valve assemblies are arranged on secondary partition plates which are sequentially arranged from an air inlet to an air outlet of the condenser body in an up-down staggered mode, and after the condensation subareas are filled with air, the one-way valve assemblies are opened to communicate with the adjacent condensation subareas; when the pressure in the condensation subarea is larger than a set value L1, the one-way valve assembly is opened, and otherwise, the one-way valve assembly is closed; a liquid level meter; the first-stage condenser is connected with the jacket reactor through the liquid discharging assembly and a backflow one-way valve, and the backflow one-way valve is electrically connected to the liquid level meter. The device disclosed by the utility model can be used for efficiently improving the production purity of phosphorus pentafluoride.

Description

Technical Field

[0001] This utility model relates to the technical field of phosphorus pentafluoride production equipment, specifically to a reaction equipment for producing high-purity phosphorus pentafluoride. Background Technology

[0002] Phosphorus pentafluoride is an important inorganic fluoride with wide industrial applications. In the electronics industry, it serves as an N-type dopant source in silicon epitaxy, diffusion, and ion implantation processes, effectively improving semiconductor performance. In the field of polymer materials, it is a raw material for the synthesis of fluorinated organic dithiophosphates, terephthalates, and other polymers. In catalysis, it acts as a catalyst for polymerization, hydrocarbonation, dehydrocarbonation, and hydrocarbon cracking reactions. Using phosphorus pentafluoride-treated titanium, nickel, beryllium, and other metal oxides as catalysts can improve reaction selectivity.

[0003] In recent years, with the vigorous development of lithium batteries, phosphorus pentafluoride, as an important raw material for lithium hexafluorophosphate electrolyte, has seen increasingly higher demand and quality requirements. Therefore, research on the preparation and purification technology of phosphorus pentafluoride is of great significance. The preparation of phosphorus pentafluoride generally involves reacting the raw materials in a jacketed reactor to generate gaseous HCl and PF5. The reaction products HCl and PF5 flow through the product outlet to a condenser, where PF5 is condensed and stored. HCl enters a waste gas emission tower through the condenser's vent pipe for treatment. Then, the PF5 condensed in the condenser is thawed, and the PF5 gas enters a PF5 container. However, the rapid reaction of anhydrous HF with PCl5 in the jacketed reactor releases a large amount of heat, causing the temperature inside the reactor to rise. This leads to the vaporization of anhydrous HF, which mixes with the PF5, affecting the purity of the PF5.

[0004] Therefore, the research objective of this invention is to design a reaction device for producing high-purity phosphorus pentafluoride by combining a condenser and a jacketed reactor arranged in two series. The reaction products are dehydrogenated by the first-stage condenser and then fed into the jacketed reactor for further reaction. The HCl and PF5 are then separated by the second-stage condenser. This device not only effectively improves the production purity of phosphorus pentafluoride but also allows for the recycling of reactants to reduce production costs. Utility Model Content

[0005] In view of the technical problems existing in the prior art, the present invention provides a reaction equipment for the production of high-purity phosphorus pentafluoride, which can effectively solve the technical problems existing in the prior art.

[0006] The technical solution of this utility model is:

[0007] A reaction apparatus for producing high-purity phosphorus pentafluoride includes: a jacketed reactor with a corresponding exhaust port at its top; a stirring mechanism installed inside the jacketed reactor; a primary condenser with its inlet connected to the exhaust port of the jacketed reactor; and a secondary condenser with its inlet connected to the outlet of the primary condenser. The secondary condenser and the primary condenser have identical structures and both include...

[0008] The condenser body is internally divided into a condensate outlet zone, a condensation zone, and a condensate inlet zone by two longitudinally arranged primary baffles; and the condensation zone is further divided into multiple non-connected condensation zones by an even number of longitudinally arranged secondary baffles.

[0009] Multiple liquid guide tubes are arranged horizontally and at intervals within the condensation zone of the condenser body. The liquid guide tubes pass through the primary baffle and the secondary baffle respectively, and their two ends are respectively connected to the condensate outlet zone and the condensate outlet zone.

[0010] One-way valve assemblies are correspondingly installed on each of the secondary partitions and are used to connect adjacent condensing zones. The one-way valve assemblies connected to the secondary partitions arranged sequentially from the air inlet to the air outlet of the condenser body are staggered vertically. When the gas in a condensing zone is full, the one-way valve assembly connected to it opens to connect to the adjacent condensing zone. When the pressure in the condensing zone is greater than a set value L1, the one-way valve assembly opens; otherwise, the one-way valve assembly closes.

[0011] Each liquid level gauge is installed in each of the condensation zones below the height of the lower one-way valve assembly;

[0012] The drain assembly includes drain branches connected to the bottom of each of the condensation zones and a main drain pipe connecting each of the drain branches. The main drain pipe on the primary condenser is connected to the jacketed reactor via a corresponding reflux pipe and a reflux check valve. The reflux check valve is electrically connected to the level gauge.

[0013] The secondary baffle is provided with corresponding vent holes, and the vent holes on the secondary baffle, arranged sequentially from the air inlet to the air outlet of the condenser body, are staggered vertically. The one-way valve assembly includes a cover tube that is fixedly installed on the secondary baffle at an angle upwards, located outside the vent holes. The bottom of the cover tube is closed around its perimeter, and its top is mesh-like. A closed ball is movably disposed inside the cover tube. Under the action of gravity, the closed ball is placed at the bottom of the inclined cover tube and closes the vent holes. When the condensation zone is filled with gas and the pressure is greater than the weight of the closed ball, the gas pushes the closed ball to move towards the mesh area of ​​the cover tube and connects it to the adjacent condensation zone through the holes in the mesh area.

[0014] The bottom of the cover tube is integrally formed and fixed with a raised edge for sealing and installing the cover tube and the secondary partition. A corresponding rubber ring is fixedly installed and fixed to the bottom inner side of the cover tube. The side of the rubber ring facing the closed ball is set as an arc surface adapted to the closed ball.

[0015] The condenser body has a condensate outlet area and a condensate inlet area, which are respectively connected to the outside by corresponding outlet pipes and inlet pipes. The inlet pipe is connected to the condensate source through a corresponding pump. The main drain pipe of the secondary condenser is connected to the phosphorus pentafluoride collection tank.

[0016] The jacketed reactor has a corresponding heat exchange jacket installed on the outer side in a spaced-out manner. The upper and lower sides of the heat exchange jacket are respectively provided with corresponding liquid inlet pipes and liquid outlet pipes, and the liquid inlet pipes are connected to the external heat exchange liquid source through corresponding liquid pumps.

[0017] The stirring mechanism includes a drive shaft that is rotatably mounted inside the jacketed reactor and driven by a corresponding electric motor, and the drive shaft is provided with corresponding stirring blades.

[0018] The upper part of the jacketed reactor is fixedly equipped with a corresponding cover, and the cover is provided with a corresponding feed inlet through a corresponding feed cover, and is connected to a gas inlet for introducing chlorine gas through a corresponding liquid inlet valve. The bottom of the jacketed reactor is provided with a discharge outlet through a corresponding material valve.

[0019] Advantages of this utility model:

[0020] 1) This utility model combines a two-stage condenser and a jacketed reactor in series. The reaction products are separated and removed by the first-stage condenser to remove the anhydrous HF that is vaporized due to the high temperature of the reaction. The anhydrous HF is then introduced into the jacketed reactor through a reflux check valve to continue the reaction. HCl and PF5 are then separated by the second-stage condenser. This not only effectively improves the production purity of phosphorus pentafluoride, but also allows for the recycling of reactants to reduce production costs.

[0021] 2) In addition, this invention further divides the condensation zones of the primary and secondary condensers, which have the same structure, into multiple non-connected condensation zones by secondary partitions. One-way valve assemblies are installed on the secondary partitions, and the one-way valve assemblies connected to the secondary partitions, arranged sequentially from the inlet to the outlet of the condenser body, are staggered vertically. This ensures that the gas must flow sequentially through each condensation zone to form an S-shaped flow, allowing the gas to fully contact and condense, thus improving the separation effect and efficiency. Furthermore, the one-way valve assembly connecting to adjacent condensation zones is a pressure one-way valve. Only after ensuring that the gas in the condensation zone is full, increasing the pressure within the condensation zone, can the one-way valve assembly be triggered to open. This not only allows the gas to remain in each condensation zone for an appropriate time for condensation and separation, but also allows the gas separated near the one-way valve assembly to gradually enter the second condensation zone for further condensation and separation, thereby further increasing the concentration of phosphorus pentafluoride prepared.

[0022] 3) Furthermore, this utility model is further provided with a level gauge electrically connected to the return check valve, and the level gauge is lower than the lower check valve assembly. This not only effectively prevents the liquid level from covering the lower check valve assembly, thus ensuring the practical effect of this utility model, but also controls the timely return of anhydrous HCl to the jacket reactor for continued use through the level gauge.

[0023] 4) This utility model sets the one-way valve assembly as a cover tube installed at the vent hole of the secondary partition at an angle upwards. The bottom of the cover tube is closed around the perimeter and its top is mesh-like. A closed ball is movably installed inside the cover tube. Under the action of gravity, the closed ball is placed at the bottom of the angled cover tube and closes the vent hole, thereby ensuring that the condensation zones are not connected. When the condensation zone is filled with gas and the pressure is greater than the weight of the closed ball, the gas pushes the closed ball to move towards the mesh area of ​​the cover tube and connects with the adjacent condensation zone through the holes in the mesh area. This allows the gas near the one-way valve assembly to flow into the adjacent condensation zone for further condensation and separation. After the gas near the one-way valve assembly flows out and the pressure in the condensation zone decreases, the closed ball will roll down and close the vent hole. Only when enough gas is separated and the pressure increases again can the closed ball be pushed again, thereby ensuring that the separated gas flows and separates gradually. The connection between adjacent condensation zones is achieved on the basis of simple structure and no other power intervention, further improving the production purity of phosphorus pentafluoride.

[0024] 5) A corresponding rubber ring is fixedly installed on the bottom inner side of the cover tube of this utility model. The side of the rubber ring facing the closed ball is set as an arc surface that matches the closed ball, so as to ensure that the vent is completely closed after the closed ball moves down, thus ensuring the practical effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the structure of the first-stage condenser.

[0027] Figure 3 for Figure 1 An enlarged schematic diagram of part A in the middle.

[0028] In the attached diagram: 1. Jacketed reactor; 101. Exhaust port; 2. Stirring mechanism; 201. Drive shaft; 202. Stirring blades; 3. Primary condenser; 4. Secondary condenser; 5. Condensate outlet zone; 503. Condensation zone; 502. Condensate inlet zone; 503. Primary baffle; 6. Secondary baffle; 7. Vent hole; 701. Liquid guide pipe; 8. One-way valve assembly; 9. Cover pipe; 901. Closing ball; 902. Protruding edge; 903. Rubber ring; 904. Level gauge; 10. Drainage assembly; 11. Return one-way valve; 12. Heat exchange jacket; 13. Cover; 14. Motor; 15. Discharge port; 16. Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0030] refer to Figure 1-3 A reaction apparatus for producing high-purity phosphorus pentafluoride includes: a jacketed reactor 1, with a corresponding exhaust port 101 at its top; a stirring mechanism 2 installed inside the jacketed reactor 1; a primary condenser 3, with its inlet connected to the exhaust port 101 of the jacketed reactor 1; and a secondary condenser 4, with its inlet connected to the outlet of the primary condenser 3. The secondary condenser 4 and the primary condenser 3 have the same structure and both include...

[0031] The condenser body 5 is internally divided into a condensate inlet zone 501, a condensation zone 502, and a condensate outlet zone 503 by two longitudinally arranged primary baffles 6; and the condensation zone 502 is further divided into multiple non-connected condensation zones by an even number of longitudinally arranged secondary baffles 7.

[0032] Multiple liquid guide pipes 8 are arranged horizontally and spaced apart in the condensation zone 502 of the condenser body 5. The liquid guide pipes 8 are distributed in a ring along the center of the circular primary baffle 6. The liquid guide pipes 8 pass through the primary baffle 6 and the secondary baffle 7 respectively, and their two ends are respectively connected to the cold condensate inlet zone 501 and the condensate outlet zone 503.

[0033] One-way valve assemblies 9 are correspondingly disposed on each of the secondary baffles 7 and are used to connect adjacent condensing zones. The one-way valve assemblies 9 connected to the secondary baffles 7 arranged sequentially from the air inlet to the air outlet of the condenser body 5 are staggered vertically. When the gas in the condensing zone is full, the one-way valve assembly 9 connected to it opens to connect to the adjacent condensing zone. When the pressure in the condensing zone is greater than the set value L1, the one-way valve assembly 9 opens, and vice versa.

[0034] Each liquid level gauge 10 is provided in each of the condensation zones below the height of the lower one-way valve assembly 9.

[0035] The drain assembly 11 includes drain branches connected to the bottom of each of the condensation zones and a main drain pipe connecting each of the drain branches. The main drain pipe on the primary condenser 3 is connected to the jacketed reactor 1 through a corresponding return pipe and a return check valve 12. The return check valve 12 is electrically connected to the level gauge 10.

[0036] This invention combines a two-stage condenser and a jacketed reactor 1 connected in series. The reaction products are separated and removed by the first-stage condenser 3 to remove the anhydrous HF that has vaporized due to the high temperature of the reaction. The anhydrous HF is then regulated by the reflux check valve 12 and introduced into the jacketed reactor 1 to continue the reaction. The second-stage condenser then separates HCl and PF5. This not only effectively improves the production purity of phosphorus pentafluoride, but also allows for the recycling of reactants to reduce production costs.

[0037] In addition, this invention further divides the condensing zones 502 of the primary condenser 3 and the secondary condenser, which have the same structure, into multiple non-connected condensing zones by a secondary partition 77. A one-way valve assembly 9 is installed on the secondary partition 77, and the one-way valve assemblies 9 connected to the secondary partitions 77, which are arranged sequentially from the air inlet to the air outlet of the condenser body, are staggered vertically. This ensures that the gas must flow through each condensing zone in sequence to form an S-shaped flow, allowing the gas to fully contact and condense, thus improving the separation effect and efficiency. Furthermore, the one-way valve assembly 9 connected to the adjacent condensing zone is a pressure one-way valve. Only after the gas in the condensing zone is filled with gas, causing the pressure in the condensing zone to increase, can the one-way valve assembly 9 be triggered to open. This not only allows the gas to stay in each condensing zone for an appropriate time for condensation and separation, but also allows the gas separated near the one-way valve assembly 9 to gradually enter the second condensing zone for further condensation and separation, thereby further increasing the preparation concentration of phosphorus pentafluoride.

[0038] Furthermore, this invention further includes a level gauge 10 electrically connected to the reflux check valve 12, and the level gauge 10 is lower than the lower check valve assembly 9. This not only effectively prevents the liquid level from covering the lower check valve assembly 9, thus ensuring the practical effect of this invention, but also controls the timely reflux of anhydrous HCl back into the jacket reactor 1 for continued use through the level gauge 10.

[0039] The secondary partition 7 is provided with corresponding vent holes 701, and the vent holes 701 on the secondary partition 7 arranged sequentially from the air inlet to the air outlet of the condenser body 5 are staggered vertically; the one-way valve assembly 9 includes a cover tube 901 that is inclined and fixedly installed on the secondary partition 7 outside the vent holes 701. The bottom of the cover tube 901 is closed around the perimeter and its top is mesh-like. A closed ball 902 is movably arranged inside the cover tube 901. Under the action of gravity, the closed ball 902 is placed at the bottom of the inclined cover tube 901 and closes the vent holes 701; when the condensation zone is filled with gas and the pressure is greater than the weight of the closed ball 902, the gas pushes the closed ball 902 to move towards the mesh area of ​​the cover tube 901 and connects to the adjacent condensation zone through the holes in the mesh area.

[0040] This invention configures the one-way valve assembly 9 as a cover tube 901 installed at the vent 701 of the secondary partition 7 at an angle upwards. The bottom of the cover tube 901 is closed around its perimeter, and its top is mesh-like. A closed ball 902 is movably disposed inside the cover tube 901. Under the action of gravity, the closed ball 902 is placed at the bottom of the angled cover tube 901 and closes the vent 701, thereby ensuring that the condensation zone is not connected. When the condensation zone is filled with gas and the pressure is greater than the weight of the closed ball 902, the gas pushes the closed ball 902 to move towards the mesh area of ​​the cover tube 901 and through the mesh. The holes in the grid area are connected to the adjacent condensation zone, allowing gas near the one-way valve assembly 9 to flow into the adjacent condensation zone for further condensation and separation. After the gas near the one-way valve assembly 9 flows out and the pressure in the condensation zone decreases, the closing ball 902 will roll down to close the vent 701. Only when enough gas has been separated and the pressure has increased again can the closing ball 902 be pushed again, thus ensuring that the separated gas flows and separates gradually. This achieves the connection between adjacent condensation zones 502 with a simple structure and without the intervention of other power sources, further improving the production purity of phosphorus pentafluoride.

[0041] The bottom of the cover tube 901 is integrally formed and fixed with a raised edge 903 for sealing and installing the cover tube 901 and the secondary partition 7. A corresponding rubber ring 904 is fixedly installed and fixed to the bottom inner side of the cover tube 901. The side of the rubber ring 904 facing the closed ball 902 is set as an arc surface that matches the closed ball 902.

[0042] The inner bottom of the cover tube 901 of this utility model is fixedly connected with a corresponding rubber ring 904. The side of the rubber ring 904 facing the closing ball 902 is set as an arc surface that matches the closing ball 902, so as to ensure that the vent hole 701 is completely closed after the closing ball 902 moves down, thus ensuring the practical effect.

[0043] The condenser body 5 has condensate inlet zone 501 and condensate inlet zone 503 respectively connected to the outside with corresponding outlet pipe and inlet pipe. The inlet pipe is connected to the condensate source through a corresponding pump. The main drain pipe of the secondary condenser 4 is connected to the phosphorus pentafluoride collection tank.

[0044] The jacketed reactor 1 has a corresponding heat exchange jacket 13 installed on the outer side in a spaced-out manner. The upper and lower sides of the heat exchange jacket 13 are respectively provided with corresponding liquid inlet pipes and liquid outlet pipes, and the liquid inlet pipes are connected to the external heat exchange liquid source through corresponding liquid pumps.

[0045] The stirring mechanism 2 includes a drive shaft 201 that is rotatably mounted inside the jacketed reactor 1 by a corresponding electric motor 15, and a corresponding stirring blade 202 is provided on the drive shaft 201.

[0046] The jacketed reactor 1 is fixedly installed with a corresponding cover 14 on the upper part. The cover 14 is provided with a corresponding feed port through a corresponding feed cover and is connected to a gas inlet for introducing chlorine gas through a corresponding liquid inlet valve. The bottom of the jacketed reactor 1 is provided with a discharge port 16 through a corresponding material valve.

[0047] Taking advantage of the sublimation property of phosphorus pentachloride, it is heated to sublimate and remove the non-volatile components. At the same time, a certain amount of chlorine gas is introduced into it, which converts phosphorus oxychloride and phosphorus trichloride into phosphorus pentachloride, thereby improving the purity of phosphorus pentachloride.

[0048] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A reaction apparatus for producing high-purity phosphorus pentafluoride, characterized in that, include: A jacketed reactor (1) is provided with a corresponding exhaust port (101) at the top; a stirring mechanism (2) is installed inside the jacketed reactor (1); a primary condenser (3) has its inlet connected to the exhaust port (101) of the jacketed reactor (1); and a secondary condenser (4) has its inlet connected to the outlet of the primary condenser (3). The secondary condenser (4) and the primary condenser (3) have the same structure and both include [missing information]. The condenser body (5) is divided into a condensate inlet zone (501), a condensation zone (502) and a condensate outlet zone (503) by two longitudinally arranged primary baffles (6); and the condensation zone (502) is further divided into multiple non-connected condensation zones by an even number of longitudinally arranged secondary baffles (7). Multiple liquid guide pipes (8) are arranged horizontally and spaced apart in the condensation zone (502) of the condenser body (5). The liquid guide pipes (8) pass through the first-stage partition (6) and the second-stage partition (7) respectively, and their two ends are connected to the condensate inlet zone (501) and the condensate outlet zone (503) respectively. One-way valve assemblies (9) are correspondingly arranged on each of the secondary partitions (7) and used to connect the adjacent condensing partitions. The one-way valve assemblies (9) connected to the secondary partitions (7) arranged sequentially from the air inlet to the air outlet of the condenser body (5) are staggered vertically. When the gas in the condensing partition is full, the one-way valve assembly (9) connected to it opens to connect the adjacent condensing partition. When the pressure in the condensing partition is greater than the set value L1, the one-way valve assembly (9) opens, and otherwise the one-way valve assembly (9) closes. Level gauge (10) is provided in each of the condensation zones below the height of the one-way valve assembly (9) on the lower side; The drain assembly (11) includes drain branches connected to the bottom of each of the condensation zones and a main drain pipe connected to each of the drain branches. The main drain pipe on the primary condenser (3) is connected to the jacketed reactor (1) through a corresponding return pipe and a return check valve (12). The return check valve (12) is electrically connected to the level gauge (10).

2. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 1, characterized in that, The secondary partition (7) is provided with corresponding vent holes (701), and the vent holes (701) on the secondary partition (7) arranged sequentially from the air inlet to the air outlet of the condenser body (5) are staggered vertically; the one-way valve assembly (9) includes a cover tube (901) that is fixedly installed on the secondary partition (7) at an angle upward and located outside the vent hole (701). The bottom of the cover tube (901) is closed around the perimeter and its top is grid-shaped. A closed ball (902) is movably arranged inside the cover tube (901). Under the action of gravity, the closed ball (902) is placed at the bottom of the inclined cover tube (901) and closes the vent hole (701); when the condensing zone is filled with gas and the pressure is greater than the weight of the closed ball (902), the gas pushes the closed ball (902) to move towards the grid area of ​​the cover tube (901) and connects to the adjacent condensing zone through the holes in the grid area.

3. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 2, characterized in that, The bottom of the cover tube (901) is integrally formed with a raised edge (903) for sealing and installing the cover tube (901) and the secondary partition (7). A corresponding rubber ring (904) is fixedly installed on the bottom inner side of the cover tube (901). The side of the rubber ring (904) facing the closed ball (902) is set as an arc surface that is adapted to the closed ball (902).

4. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 1, characterized in that, The condenser body (5) has a condensate outlet area (503) and a condensate inlet area (501) respectively connected to the outside by a corresponding outlet pipe and an inlet pipe. The inlet pipe is connected to the condensate source through a corresponding pump. The drain manifold of the secondary condenser (4) is connected to the phosphorus pentafluoride collection tank.

5. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 1, characterized in that, The jacketed reactor (1) has a corresponding heat exchange jacket (13) installed on the outer side in a spaced manner. The upper and lower sides of the heat exchange jacket (13) are respectively provided with corresponding liquid inlet pipes and liquid outlet pipes, and the liquid inlet pipes are connected to the external heat exchange liquid source through corresponding liquid pumps.

6. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 1, characterized in that, The stirring mechanism (2) includes a drive shaft (201) that is rotatably mounted in the jacketed reactor (1) by a corresponding electric motor (15), and a corresponding stirring blade (202) is provided on the drive shaft (201).

7. The reaction equipment for producing high-purity phosphorus pentafluoride according to claim 1, characterized in that, The jacketed reactor (1) is fixedly installed with a corresponding cover (14) on the upper part. The cover (14) is provided with a corresponding feed inlet through a corresponding feed cover and is connected to a gas inlet for introducing chlorine gas through a corresponding liquid inlet valve. The bottom of the jacketed reactor (1) is provided with a discharge port (16) through a corresponding material valve.

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