Metering device for anhydrous and oxygen-free reaction in industrial scale-up production

Abstract

This utility model discloses a metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production, relating to the technical field of chemical reaction apparatus for industrial scale-up production. The device includes a reaction vessel unit, comprising a vessel body and a thermometer and pressure gauge mounted on the vessel body; a condensation and reflux unit connected to the vessel body for condensing and refluxing steam within the vessel body; a material feeding unit connected to the vessel body for adding materials into the vessel body; and a gas drying unit, whose inlet is connected to a gas source and whose outlet is connected to both the material feeding unit and the vessel body, wherein the gas source is nitrogen or an inert gas. The device provided by this utility model is easy to connect and maintain, and has good sealing performance; the entire system ensures that the reaction takes place in an anhydrous and oxygen-free environment, and is suitable for feeding reactions of Grignard reagents, LDA, and the active metal compound n-butyllithium in scale-up production.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical reaction devices for industrial scale-up production, and more specifically, to a metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production. Background Technology

[0002] In organic synthesis, Grignard reagents or other liquid materials that cannot come into contact with water or oxygen are frequently used, such as Grignard reagents, LDA, and the reactive metal compound n-butyllithium. These materials are extremely sensitive to air and water, readily undergoing chemical reactions that are exothermic and can even ignite. Therefore, the entire reaction process must be carried out in an anhydrous and oxygen-free environment. In the laboratory, syringes are generally used to transfer these reagents, but this is only suitable for experiments involving small quantities and easy manipulation. In large-scale production, it is difficult to add these materials, and any change to the anhydrous and oxygen-free sealed environment of the reaction system can cause significant losses or even safety hazards. Therefore, it is crucial to solve these problems and provide a stable anhydrous and oxygen-free environment and a controllable metering and feeding device and method for the corresponding reactions. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production. The device provided by this utility model can ensure the environmental requirements of anhydrous and oxygen-free reaction during the feeding process.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] A metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production, comprising:

[0006] A reaction vessel unit, the reaction vessel unit including a vessel body and a thermometer and a pressure gauge disposed on the vessel body;

[0007] A condensation reflux unit, connected to the vessel body, is used to condense and reflux the steam inside the vessel body;

[0008] A material feeding unit, connected to the vessel body, is used to add materials into the vessel body;

[0009] The gas drying unit has its inlet end connected to a gas source and its outlet end connected to the material feeding unit and the vessel body, respectively. The gas source is nitrogen or an inert gas.

[0010] Furthermore, the condensation reflux unit includes a condenser, an evaporator, and a reflux pipe. One end of the evaporator is connected to the vessel body, and the other end is connected to the condenser. One end of the reflux pipe is connected to the condenser, and the other end is connected to the vessel body. The condenser is also connected to a first vacuum pipe and a first vent pipe. A seventh valve is installed on the first vacuum pipe, and a sixth valve is installed on the first vent pipe. The sixth valve is a single-call valve.

[0011] Furthermore, the return pipe is also equipped with a sight glass, a U-shaped tube, and a drain valve.

[0012] Furthermore, the material feeding unit includes a material tank, a first feed pipe and a feeding pump. One end of the first feed pipe is connected to the material tank and the other end is connected to the vessel body. The feeding pump is installed on the first feed pipe, and a fifth valve is also provided on the first feed pipe.

[0013] Furthermore, the gas drying unit includes a concentrated sulfuric acid dehydration component, a calcium chloride drying component, and an adsorption cotton component connected in sequence by pipelines;

[0014] The air inlet of the concentrated sulfuric acid dehydration component is connected to the air source, and a first valve is installed on the pipeline between the air source and the concentrated sulfuric acid dehydration component.

[0015] The air outlet of the adsorption cotton assembly is provided with a first air pipe and a second air pipe connected in parallel; the first air pipe is connected to the material bucket, the second air pipe is connected to the bottom of the kettle body, the first air pipe is provided with a fourth valve, and the second air pipe is provided with a third valve and an eighth valve.

[0016] Furthermore, the air outlet of the adsorption cotton assembly is also provided with a third air pipe that is distributed in parallel with the first air pipe and the second air pipe, and a second valve is provided on the third air pipe.

[0017] Furthermore, a discharge pipe is provided at the bottom of the vessel body, and a tenth valve and a ninth valve are installed on the discharge pipe. The second gas pipe is connected to the discharge pipe between the tenth valve and the ninth valve.

[0018] Furthermore, the material feeding unit also includes a metering tank and a second feed pipe. One end of the second feed pipe is connected to the metering tank, and the other end is connected to the vessel body. The metering tank is also equipped with a liquid filling pipe, an air inlet pipe, a second vacuum pipe, and a second venting pipe.

[0019] Furthermore, a jacket is provided on the outer periphery of the vessel body, and the jacket is provided with a cold liquid inlet and a cold liquid outlet.

[0020] The beneficial effects of this utility model are as follows:

[0021] The metering and feeding device provided by this utility model, by setting up a condensation reflux unit, can ensure that the reaction proceeds in a sealed manner while improving the recycling of the reaction solvent and maintaining the stability of the reaction system. The gas drying unit is connected to the material feeding unit, which can ensure that the addition of hazardous reagents (such as Grignard reagents) is completed under the protection of inert gas or nitrogen, avoiding contact between the reagents and air or water and causing danger. In other words, the device provided by this utility model is easy to connect and maintain, and has a good sealing effect. The whole device can ensure that the reaction is carried out in an anhydrous and oxygen-free environment, and is suitable for the feeding reaction of Grignard reagents, LDA, and active metal compounds n-butyllithium in scale-up production. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the condensation reflux unit and the reaction vessel unit in this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the reaction vessel unit and the material feeding unit in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Reactor unit; 11. Reactor body; 12. Thermometer; 13. Pressure gauge; 14. Discharge pipe; 15. Tenth valve; 16. Ninth valve; 17. Jacket; 18. Cooler inlet; 19. Cooler outlet;

[0028] 2. Condensation reflux unit; 21. Condenser; 22. Evaporator tube; 23. Reflux tube; 24. First vacuum tube; 25. First vent tube; 26. Sixth valve; 27. Seventh valve; 28. Sight glass; 29. ​​U-tube; 2a. Drain valve;

[0029] 3. Material feeding unit; 31. Material bucket; 32. First feed pipe; 33. Feeding pump; 34. Fifth valve; 35. Forklift scale; 36. Metering tank; 37. Second feed pipe; 38. Liquid filling pipe; 39. Air inlet pipe; 3a. Second vacuum pipe; 3b. Second vent pipe; 3c. Material bucket discharge valve; 3d. Material bucket air inlet valve; 3e. Rigid pipe;

[0030] 4. Gas drying unit; 41. Second valve; 42. Concentrated sulfuric acid dehydration assembly; 43. Calcium chloride drying assembly; 44. Adsorption cotton assembly; 45. First valve; 46. First gas pipe; 47. Second gas pipe; 48. Fourth valve; 49. Third valve; 4a. Eighth valve; 4b. Third gas pipe;

[0031] 5. Gas source. Detailed Implementation

[0032] The structure provided by this utility model will be explained and described in detail below with reference to the accompanying drawings.

[0033] refer to Figures 1 to 3 As shown, this embodiment specifically discloses a metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production, comprising:

[0034] The reactor unit 1 includes a vessel body 11 and a thermometer 12 and a pressure gauge 13 disposed on the vessel body 11.

[0035] The condensation reflux unit 2 is connected to the vessel body 11 and is used to condense and reflux the steam inside the vessel body 11.

[0036] Material feeding unit 3 is connected to the vessel body 11 and is used to add materials into the vessel body 11;

[0037] The gas drying unit 4 has its inlet end connected to the gas source 5, and its outlet end connected to the material feeding unit 3 and the vessel body 11 respectively. The gas source 5 is nitrogen or an inert gas, and the inert gas can be argon.

[0038] In this embodiment, by setting up the condensation reflux unit 2, the reaction can be carried out in a sealed manner while improving the recycling of the solvent inside the vessel 11 and maintaining the stability of the reaction system. The gas drying unit 4 is connected to the material feeding unit 3, which can ensure that the addition of hazardous reagents (such as Grignard reagents) is completed under the protection of inert gas or nitrogen, avoiding contact between the reagents and air or water, thus preventing danger. In other words, the device provided by this utility model can ensure that the reaction is carried out in an anhydrous and oxygen-free environment, and is suitable for the feeding reaction of Grignard reagents, LDA, and active metal compounds n-butyllithium in scale-up production.

[0039] Combination Figure 2As shown, in some embodiments, the condensation reflux unit 2 includes a condenser 21, an evaporator 22, and a reflux pipe 23. One end of the evaporator 22 is connected to the vessel body 11, and the other end is connected to the condenser 21. One end of the reflux pipe 23 is connected to the condenser 21, and the other end is connected to the vessel body 11. A first vacuum tube 24 and a first vent pipe 25 are also connected to the condenser 21. A seventh valve 27 is installed on the first vacuum tube 24, and a sixth valve 26 is installed on the first vent pipe 25. The sixth valve 26 is a one-way valve (i.e., a one-way exhaust valve).

[0040] In this process, volatile substances (such as solvents and low-boiling-point reactants) inside the vessel 11 are heated and evaporated. They then enter the condenser 21 through the evaporation pipe 22 to condense the evaporated substances. Finally, they return to the vessel 11 through the reflux pipe 23, maintaining the material balance of the reaction system and avoiding volatilization losses. In addition, by setting a first vacuum pipe 24, a certain vacuum can be maintained during condensation, thereby lowering the boiling point and promoting condensation. Furthermore, a vacuum can also be drawn from the vessel 11 through the evaporation pipe 22 or the reflux pipe 23, which facilitates maintaining a certain vacuum in the vessel 11 during subsequent feeding processes, promoting the addition of materials. The first vent pipe 25 and the sixth valve 26 can be used to discharge the gas in the system when it is necessary, while preventing external gas from entering in reverse, thereby maintaining the stability of the oxygen-free and water-free environment in the system.

[0041] In some embodiments, the reflux pipe 23 is also equipped with a sight glass 28, a U-shaped tube 29, and a drain valve 2a. The sight glass 28 allows for real-time observation of the reflux liquid status, assisting in monitoring the reaction process; the U-shaped tube 29 provides a certain pressure buffering effect and offers some protection to the condenser and valves.

[0042] Combination Figure 1 and Figure 3 As shown in the illustrated embodiment, the material feeding unit 3 includes a material tank 31, a first feed pipe 32, and a feeding pump 33. It can be understood that a material tank discharge valve 3c and a material tank air inlet valve 3d are provided on the material tank 31. Specifically, a rigid pipe 3e is inserted into the material tank 31, and the material tank air inlet valve 3d and the material tank discharge valve 3c are respectively installed on the upper end of the rigid pipe 3e. One end of the first feed pipe 32 is connected to the material tank discharge valve 3c of the material tank 31, and the other end is connected to the vessel body 11. The feeding pump 33 is installed on the first feed pipe 32, and a fifth valve 34 is also provided on the first feed pipe 32.

[0043] The bottom of the material bin 31 can be equipped with a forklift scale 35 for real-time monitoring of the feeding weight. The feeding pump 33 can be a peristaltic pump, which offers high precision, controllable feeding speed, and ensures purity and safety during the feeding process. The peristaltic pump, installed between the material bin 31 and the vessel body 11, forms a closed loop to ensure stable pressure within the device, facilitating control. Furthermore, the first feed pipe 32 can be made of flexible hose for easy installation and adjustment.

[0044] Continue to refer to Figure 1 and Figure 3 As shown, the gas drying unit 4 includes a concentrated sulfuric acid dehydration component 42, a calcium chloride drying component 43, and an adsorption cotton component 44 connected in sequence by pipelines.

[0045] The air inlet of the concentrated sulfuric acid dehydration component 42 is connected to the air source 5, and a first valve 45 is installed on the pipeline between the air source 5 and the concentrated sulfuric acid dehydration component 42.

[0046] The air outlet of the absorbent cotton assembly 44 is provided with a first air pipe 46 and a second air pipe 47 connected in parallel; the first air pipe 46 is connected to the material tank inlet valve 3d of the material tank 31, and the second air pipe 47 is connected to the bottom of the vessel body 11. A fourth valve 48 is provided on the first air pipe 46, and a third valve 49 and an eighth valve 4a are provided on the second air pipe 47.

[0047] In this embodiment, the concentrated sulfuric acid dehydration component 42, the calcium chloride drying component 43, and the adsorption cotton component 44 are arranged in sequence, i.e., multi-stage drying, which can effectively remove moisture from the gas and ensure that the moisture in the nitrogen or inert gas is fully removed.

[0048] The first valve 45 installed on the pipeline between the gas source 5 and the concentrated sulfuric acid dehydration component 42 can conveniently control the gas entry and facilitate the opening or closing of the gas supply when needed; the first gas pipe 46 and the second gas pipe 47 are connected in parallel at the gas outlet of the adsorption cotton component 44, and valves are installed on each pipe to realize flexible control of the flow direction of the dried nitrogen or inert gas; it can meet the needs of different process links for dried nitrogen or inert gas.

[0049] Furthermore, the outlet end of the adsorption cotton assembly 44 is also provided with a third gas pipe 4b, which is distributed in parallel with the first gas pipe 46 and the second gas pipe 47. The third gas pipe 4b is provided with a second valve 41, which can more flexibly configure the dried nitrogen or inert gas, further improve the versatility and adaptability of the device, and further ensure that the subsequent reactor is water-free and oxygen-free.

[0050] Continue to refer to Figure 1 and Figure 2As shown, a discharge pipe 14 is provided at the bottom of the vessel body 11. A tenth valve 15 and a ninth valve 16 are installed on the discharge pipe 14. A second gas pipe 47 is connected to the discharge pipe 14 between the tenth valve 15 and the ninth valve 16. After the reaction is completed in the vessel body 11, the reaction products can be discharged by opening the tenth valve 15 and the ninth valve 16.

[0051] In some preferred embodiments, the feeding unit 3 of the device further includes a metering tank 36 and a second feed pipe 37. One end of the second feed pipe 37 is connected to the metering tank 36, and the other end is connected to the vessel body 11. The metering tank 36 is also equipped with a liquid addition pipe 38, an air inlet pipe 39, a second vacuum pipe 3a, and a second vent pipe 3b. By providing the metering tank 36 and the corresponding second feed pipe 37, etc., solvent can be added.

[0052] The vessel body 11 is also provided with a jacket 17 on its outer periphery. The jacket 17 is provided with a cooling inlet 18 and a cooling outlet 19. By providing the jacket 17, the material inside the vessel can be cooled evenly. Especially in some exothermic reactions, the jacket can effectively buffer drastic temperature changes and prevent the reaction from getting out of control or the material properties from changing due to a sudden increase in temperature, thereby ensuring the safety and stability of the reaction.

[0053] The apparatus provided by this invention is illustrated by adding Grignard reagent to the vessel body 11:

[0054] (1) Vacuum dry the entire metering and feeding device for the anhydrous and oxygen-free reaction, including reactor unit 1, condensation and reflux unit 2, material feeding unit 3, gas drying unit 4, and corresponding connecting pipes and valves, to ensure that the equipment and pipelines are dry and free of water.

[0055] (2) Ensure that the material bucket discharge valve 3c, feeding pump 33 (peristaltic pump), fifth valve 34, ninth valve 16, third valve 49, and sixth valve 26 of the material bucket 31 are properly sealed.

[0056] (3) Open the seventh valve 27 on the condenser. When the vacuum of the pressure gauge 13 on the vessel body 11 is ≤-0.07MPa, close the seventh valve 27 and open the first valve 45, the third valve 49 and the tenth valve 15. Let the nitrogen (or argon) pass through the concentrated sulfuric acid dehydration component 42, the calcium chloride drying component 43 and the adsorption cotton component 44 and then enter the vessel body 11 through the second gas pipe 47. Slowly return the pressure to a slightly positive pressure and close the third valve 49 and the first valve 45.

[0057] (4) Continue to repeat the previous step, and finally close the tenth valve 15, the eighth valve 4a, the third valve 49 and the first valve 45; to achieve the sealing test of the entire device and ensure an oxygen-free and water-free environment in the subsequent feeding process.

[0058] (5) Connect the fourth valve 48 to the material tank air inlet valve 3d of the material tank 31. During the connection process, open part of the first valve 45 to exhaust the air in the hose, and then quickly connect the material tank air inlet valve 3d. After the connection is complete, close the fourth valve 48.

[0059] (6) Open the seventh valve 27 on the condenser 21. When the vacuum on the pressure gauge is ≤-0.07MPa, close the seventh valve 27, open the first valve 45, and open the fourth valve 48 connected to the material barrel air inlet valve 3d, so that a certain vacuum is maintained in the vessel 11, which facilitates the formation of a certain pressure difference, making it easier to add materials into the vessel 11.

[0060] (7) Start stirring, and as needed, introduce coolant into the jacket 17 of the vessel 11. Start the peristaltic pump and pump the material in the material bucket 31 into the vessel 11 through the peristaltic pump. Throughout the process, keep the pressure value of the pressure gauge 13 on the vessel 11 lower than the pressure of the input nitrogen (or argon) after drying, so as to ensure that the material can be smoothly pumped into the vessel 11.

[0061] (8) Determine the amount of material to be added based on the weighable forklift scale 35 below the material bucket 31. After the material is added, close the material bucket discharge valve 3c, the fourth valve 48, and the first valve 45 on the material bucket 31. Use a peristaltic pump to pump the remaining material into the reactor body 11, and then quickly close the fifth valve 34.

[0062] (9) Open the first valve 45, the second valve 41 and the sixth valve 26 to introduce nitrogen (or argon) into the vessel 1, and exhaust the gas through the single exhalation valve after the sixth valve 26 to ensure that there is no water or oxygen in the vessel 11 for subsequent reactions.

[0063] (10) Similarly, the same method can be used when the material to be added enters the metering tank 36.

[0064] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any at least one embodiment or example. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and simple improvements made on the substantive content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A metering and feeding device for anhydrous and oxygen-free reactions in industrial scale-up production, characterized in that, include: The reactor unit (1) includes a vessel body (11) and a thermometer (12) and a pressure gauge (13) disposed on the vessel body (11); The condensation reflux unit (2) is connected to the vessel body (11) and is used to condense and reflux the steam in the vessel body (11); The material feeding unit (3) is connected to the vessel body (11) and is used to add materials into the vessel body (11); The gas drying unit (4) has its inlet end connected to the gas source (5) and its outlet end connected to the material feeding unit (3) and the vessel body (11) respectively. The gas source (5) is nitrogen or an inert gas.

2. The metering and feeding device according to claim 1, characterized in that, The condensation reflux unit (2) includes a condenser (21), an evaporator (22) and a reflux pipe (23). One end of the evaporator (22) is connected to the vessel body (11) and the other end is connected to the condenser (21). One end of the reflux pipe (23) is connected to the condenser (21) and the other end is connected to the vessel body (11). The condenser (21) is also connected to a first vacuum pipe (24) and a first vent pipe (25). A seventh valve (27) is installed on the first vacuum pipe (24) and a sixth valve (26) is installed on the first vent pipe (25). The sixth valve (26) is a single-call valve.

3. The metering and feeding device according to claim 2, characterized in that, The return pipe (23) is also equipped with a sight glass (28), a U-shaped pipe (29) and a drain valve (2a).

4. The metering and feeding device according to claim 1, characterized in that, The material feeding unit (3) includes a material tank (31), a first feed pipe (32) and a feeding pump (33). One end of the first feed pipe (32) is connected to the material tank (31), and the other end is connected to the vessel body (11). The feeding pump (33) is installed on the first feed pipe (32). A fifth valve (34) is also provided on the first feed pipe (32).

5. The metering and feeding device according to claim 4, characterized in that, The gas drying unit (4) includes a concentrated sulfuric acid dehydration assembly (42), a calcium chloride drying assembly (43), and an adsorption cotton assembly (44) connected in sequence by pipelines; The air inlet of the concentrated sulfuric acid dehydration component (42) is connected to the air source (5), and a first valve (45) is provided on the pipeline between the air source (5) and the concentrated sulfuric acid dehydration component (42). The air outlet of the absorbent cotton assembly (44) is provided with a first air pipe (46) and a second air pipe (47) connected in parallel; the first air pipe (46) is connected to the material bucket (31), the second air pipe (47) is connected to the bottom of the vessel body (11), a fourth valve (48) is provided on the first air pipe (46), and a third valve (49) and an eighth valve (4a) are provided on the second air pipe (47).

6. The metering and feeding device according to claim 5, characterized in that, The air outlet of the absorbent cotton assembly (44) is also provided with a third air pipe (4b) that is distributed in parallel with the first air pipe (46) and the second air pipe (47), and a second valve (41) is provided on the third air pipe (4b).

7. The metering and feeding device according to claim 5, characterized in that, The bottom of the vessel body (11) is provided with a discharge pipe (14), and a tenth valve (15) and a ninth valve (16) are installed on the discharge pipe (14). The second gas pipe (47) is connected to the discharge pipe (14) between the tenth valve (15) and the ninth valve (16).

8. The metering and feeding device according to claim 4, characterized in that, The material feeding unit (3) also includes a metering tank (36) and a second feed pipe (37). One end of the second feed pipe (37) is connected to the metering tank (36), and the other end is connected to the vessel body (11). The metering tank (36) is also provided with a liquid adding pipe (38), an air inlet pipe (39), a second vacuum pipe (3a), and a second vent pipe (3b).

9. The metering and feeding device according to claim 2, characterized in that, The outer periphery of the vessel body (11) is also provided with a jacket (17), and the jacket (17) is provided with a cold liquid inlet (18) and a cold liquid outlet (19).

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