Sodium nitrite dissolving kettle

Abstract

The utility model discloses a sodium nitrite dissolving kettle which comprises a reaction kettle, a cooling water circulating device and a circulating pipeline, the reaction kettle is provided with a first cavity and a second cavity which are sequentially sleeved from inside to outside, and the reaction kettle is further provided with a feed port, a discharge port and a return port which are communicated with the first cavity; the cooling water circulating device is communicated with the second cavity; the two ends of the circulating pipeline are connected with the discharge port and the return port respectively, and the circulating pipeline is used for circulating sodium nitrite in the first cavity. According to the invention, sodium nitrite is pre-cooled, so that the heat dissipation pressure of the oximation methylation reaction kettle can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reaction kettles, in particular to a sodium nitrite dissolving kettle. Background Art

[0002] Reactors are widely used in petroleum, chemical industry, rubber, pesticides, dyes, medicine, and food. They are used as containers to complete processes such as vulcanization, nitration, hydrogenation, hydrocarbonization, polymerization, and condensation, such as reactors, reaction pots, decomposition pots, and polymerization kettles. Oximation methylation reactor is one of many reactors. Oximation methylation reactor is the first reaction vessel used in the process of preparing AE-active ester. Sodium nitrite, dilute sulfuric acid, ethyl acetoacetate, etc. need to be added to the oximation methylation reactor to participate in the reaction. A large amount of heat will be generated during the reaction. A large amount of heat cannot be discharged, which will affect the normal reaction of the raw materials in the reactor. Therefore, the oximation methylation reactor generally has a heat dissipation device, and a heat exchanger is also used to pre-cool the raw materials to relieve the pressure of the heat dissipation device of the oximation methylation reactor. For example, sodium nitrite needs to be reduced to below 5 degrees through a heat exchanger before being put into the oximation methylation reactor, but the cooling effect of the heat exchanger is generally poor.

[0003] Patent CN220573355U discloses a kettle for preparing sodium nitrite solution, comprising an outer tank and an inner tank, wherein the inner tank is sleeved inside the outer tank, an air cavity is provided between the outer tank and the inner tank, a head is clamped at the top end of the outer tank, a waste heat reflux assembly is provided at the outer end of the outer tank, and the waste heat reflux assembly comprises a long air inlet tube fixedly connected between the outer tank and the head.

[0004] A large amount of heat will be generated during the oximation and methylation reaction. The inability to discharge a large amount of heat will affect the normal reaction of the raw materials in the reactor. However, the reactor in the above-mentioned prior art cannot pre-cool the sodium nitrite, resulting in a large heat dissipation pressure in the oximation and methylation reactor. Utility Model Content

[0005] The utility model aims to overcome the above technical deficiencies and propose a sodium nitrite dissolving kettle to solve the technical problem that the reactor in the prior art cannot pre-cool the sodium nitrite, resulting in a large heat dissipation pressure of the oximation methylation reactor.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a sodium nitrite dissolving kettle, comprising:

[0008] A reactor, comprising a first cavity and a second cavity which are sequentially sleeved from the inside to the outside, the reactor is also provided with a feed inlet, a discharge port and a return port which are connected to the first cavity, and the discharge port is used to connect with the oximation methylation reactor;

[0009] a cooling water circulation device, connected to the second cavity, and used for conveying cooling water to the second cavity; and

[0010] A circulation pipeline, with two ends respectively connected to the discharge port and the return port, and the circulation pipeline is used to circulate the sodium nitrite in the first cavity.

[0011] In some embodiments, the circulation pipeline includes a first pipeline, a first valve, a second pipeline, a second valve and a material pump, the first end of the first pipeline is connected to the discharge port, the second end of the first pipeline is connected to one end of the second pipeline, the other end of the second pipeline is connected to the return port, the first valve and the material pump are arranged in the first pipeline, and the second valve is arranged in the second pipeline.

[0012] In some embodiments, the sodium nitrite dissolution kettle also includes a discharge pipeline, which includes a third pipeline and a third valve, one end of the third pipeline is connected to the second end of the first pipeline, and the other end of the third pipeline is connected to the oximation methylation reactor, and the third valve is arranged on the third pipeline.

[0013] In some embodiments, the diameters of the first conduit, the second conduit, and the third conduit are the same.

[0014] In some embodiments, the feed inlet and the return inlet are located at the top of the reactor, and the discharge port is located at the bottom of the reactor.

[0015] In some embodiments, the sodium nitrite dissolving kettle further includes a drain pipe and a fourth valve, the drain pipe is connected to the discharge port, and the fourth valve is disposed on the drain pipe.

[0016] In some embodiments, the sodium nitrite dissolving kettle further includes a thermometer, which is disposed in the first cavity and is used to detect the temperature of the sodium nitrite in the first cavity.

[0017] In some embodiments, the sodium nitrite dissolving kettle further includes a ventilation pipe and an air pump, one end of the ventilation pipe is connected to the first cavity, and the air pump is arranged on the ventilation pipe.

[0018] In some embodiments, the sodium nitrite dissolution kettle further includes a liquid level meter and a solvent addition pipeline, wherein the liquid level meter is disposed in the reactor and is used to detect the liquid level in the first cavity, and the solvent addition pipeline is connected to the first cavity and is used to transport the solvent to the first cavity.

[0019] In some embodiments, a manhole connected to the first cavity is also provided on the top of the reactor.

[0020] Compared with the prior art, the utility model provides a sodium nitrite dissolving kettle, wherein the reactor has a first cavity and a second cavity which are sequentially sleeved from the inside to the outside, and the reactor is also provided with a feed port, a discharge port and a return port which are connected to the first cavity; the cooling water circulation device is connected to the second cavity; the two ends of the circulation pipeline are respectively connected to the discharge port and the return port, and the circulation pipeline is used to circulate the sodium nitrite in the first cavity; the two ends of the discharge pipeline are respectively connected to the discharge port and the oximation methylation reactor. When it is used specifically, sodium nitrite is firstly injected into the first cavity through the feed port, the pipeline between the reactor and the oximation methylation reactor is closed, and the return port is opened. The circulation pipeline is then started, and the cooling water circulation device is started to continuously inject cooling water into the second cavity, and the cooling water exchanges heat with the sodium nitrite, thereby reducing the temperature of the sodium nitrite, and the sodium nitrite continuously circulates between the circulation pipeline and the first cavity, so that the sodium nitrite can continuously exchange heat with the cooling water, and the temperature of the sodium nitrite can be fully reduced. When the temperature of the sodium nitrite is reduced to the set temperature, the circulation pipeline is closed, and the pipeline between the reactor and the oximation methylation reactor is opened, and the sodium nitrite that meets the temperature is transported to the oximation methylation reactor. By pre-cooling the sodium nitrite, the heat dissipation pressure of the oximation methylation reactor can be effectively reduced.

[0021] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the preferred embodiment of the utility model is described in detail as follows with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of an embodiment of a sodium nitrite dissolving kettle provided by the utility model.

[0023] Description of reference numerals:

[0024] 1-reactor, 11-first cavity, 12-second cavity, 13-feeding port;

[0025] 2-Cooling water circulation device;

[0026] 3-circulation pipeline, 31-first pipeline, 32-first valve, 33-second pipeline, 34-second valve, 35-material pump;

[0027] 4-discharging pipeline, 41-third pipeline, 42-third valve;

[0028] 5- sewage pipe;

[0029] 6-Fourth valve;

[0030] 7-First three-way;

[0031] 8- Second tee. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] In order to solve the technical problem that the reactor in the prior art cannot pre-cool the sodium nitrite, resulting in a large heat dissipation pressure of the oximation methylation reactor, the utility model provides a sodium nitrite dissolving kettle, which can pre-cool the sodium nitrite and effectively reduce the heat dissipation pressure of the oximation methylation reactor.

[0034] See also Figure 1 , Figure 1 It is a schematic structural diagram of a sodium nitrite dissolving kettle in one embodiment of the utility model.

[0035] The utility model provides a sodium nitrite dissolving kettle, comprising a reactor 1, a cooling water circulation device 2, and a circulation pipeline 3. The reactor 1 has a first cavity 11 and a second cavity 12 which are sequentially sleeved from the inside to the outside. The reactor 1 is also provided with a feed port 13, a discharge port and a return port which are connected to the first cavity 11. The discharge port is used to be connected to an oximation methylation reactor; the cooling water circulation device 2 is connected to the second cavity 12; the two ends of the circulation pipeline 3 are respectively connected to the discharge port and the return port, and the circulation pipeline 3 is used to circulate the sodium nitrite in the first cavity 11.

[0036] In this embodiment, the sodium nitrite dissolving kettle further includes a discharge pipeline 4, both ends of which are respectively connected to the discharge port and the oximation methylation reactor, and the discharge pipeline 4 is used to transport the sodium nitrite in the first cavity 11 to the oximation methylation reactor.

[0037] In this embodiment, the reactor 1 has a first cavity 11 and a second cavity 12 which are sequentially sleeved from the inside to the outside, and the reactor 1 is also provided with a feed port 13, a discharge port and a return port connected to the first cavity 11; the cooling water circulation device 2 is connected to the second cavity 12; the two ends of the circulation pipeline 3 are respectively connected to the discharge port and the return port, and the circulation pipeline 3 is used to circulate the sodium nitrite in the first cavity 11; the two ends of the discharge pipeline 4 are respectively connected to the discharge port and the oximation methylation reactor. When used, sodium nitrite is first injected into the first cavity 11 through the feed port 13, the discharge pipeline 4 is closed, and the circulation pipeline is opened. 3. Then, the cooling water circulation device 2 is started, and cooling water is continuously injected into the second cavity 12. The cooling water exchanges heat with the sodium nitrite, thereby reducing the temperature of the sodium nitrite. The sodium nitrite circulates continuously between the circulation pipeline 3 and the first cavity 11, so that the sodium nitrite can continuously exchange heat with the cooling water, and the temperature of the sodium nitrite can be fully reduced. When the temperature of the sodium nitrite is reduced to the set temperature, the circulation pipeline 3 is closed, and the discharge pipeline 4 is opened, and the sodium nitrite that meets the temperature is transported from the discharge pipeline 4 to the oximation methylation reactor. By pre-cooling the sodium nitrite, the heat dissipation pressure of the oximation methylation reactor can be effectively reduced.

[0038] In one embodiment, the circulation pipeline 3 includes a first pipeline 31, a first valve 32, a second pipeline 33, a second valve 34 and a material pump 35, the first end of the first pipeline 31 is connected to the discharge port, the second end of the first pipeline 31 is connected to one end of the second pipeline 33, the other end of the second pipeline 33 is connected to the return port, the first valve 32 and the material pump 35 are arranged on the first pipeline 31, and the second valve 34 is arranged on the second pipeline 33.

[0039] In this embodiment, the first pipeline 31 and the second pipeline 33 are connected in sequence, and one end of the first pipeline 31 is connected to the discharge port, and one end of the second pipeline 33 is connected to the return port. The first valve 32 can control the on-off of the first pipeline 31, and the second valve 34 can control the on-off of the second channel. The material pump 35 can pump the material at the discharge port to the return port, so that the first cavity 11, the first pipeline 31 and the second pipeline 33 form a cycle, and the material can continuously circulate in the first cavity 11, the first pipeline 31 and the second pipeline 33. When the material needs to be circulated, it is only necessary to open the first valve 32, the second valve 34 and the material pump 35. The cooling water circulation and the material circulation form a double circulation system, and the cooling effect is better.

[0040] In one embodiment, the sodium nitrite dissolving kettle also includes a discharge pipeline 4, and the discharge pipeline 4 includes a third pipeline 41 and a third valve 42. One end of the third pipeline 41 is connected to the second end of the first pipeline 31, and the other end of the third pipeline 41 is connected to the oximation methylation reactor. The third valve 42 is arranged on the third pipeline 41.

[0041] In this embodiment, the sodium nitrite dissolving kettle also includes a first tee 7, the second end of the first pipeline 31 is connected to the inlet of the first tee 7, one of the outlets of the first tee 7 is connected to the third pipeline 41, and the other outlet of the first tee 7 is connected to the second pipeline 33. The third valve 42 can control the on-off of the third pipeline 41. During specific use, when the material needs to be circulated and cooled, the first valve 32 and the second valve 34 are opened, the third valve 42 is closed, and the material pump 35 is started. When the material needs to be transported, the first valve 32 and the third valve 42 are opened, the second valve 34 is closed, and the material pump 35 is started. With this arrangement, the circulation and transportation of the material share one material pump 35, which reduces the number of material pumps 35 and reduces the cost.

[0042] In one embodiment, the diameters of the first pipeline 31 , the second pipeline 33 and the third pipeline 41 are the same, so as to ensure the consistency of material flow and avoid increasing the load of the material pump 35 .

[0043] In one embodiment, the feed port 13 and the return port are located at the top of the reactor 1 , and the discharge port is located at the bottom of the reactor 1 .

[0044] In this embodiment, the discharge port is arranged at the bottom of the reactor 1 to facilitate discharge, and the return port is located at the top of the reactor 1 to increase the heat exchange area between the material and the cooling water during the circulation process and improve the heat exchange effect.

[0045] In one embodiment, the sodium nitrite dissolving kettle further includes a drain pipe 5 and a fourth valve 6 , the drain pipe 5 is connected to the discharge port, and the fourth valve 6 is disposed on the drain pipe 5 .

[0046] In this embodiment, after the reactor 1 has been used for a period of time, the first cavity 11 needs to be cleaned. In order to discharge excess material in the first cavity 11, the sodium nitrite dissolving kettle also includes a second tee 8, and the first pipeline 31 includes a first section and a second section. One end of the first section is connected to the discharge port, and the other end of the first section is connected to the inlet of the second tee 8, one end of the second section is connected to an outlet of the second tee 8, and the other end of the second section is connected to the inlet of the first tee 7. The drain pipe 5 is connected to the other outlet of the second tee 8. The first valve 32 and the material pump 35 are both located in the second section. The fourth valve 6 is provided on the drain pipe 5 to control the on and off of the drain pipe 5. When the material is circulated and transported, the fourth valve 6 is in a closed state. When the reactor 1 needs to be cleaned, the fourth valve 6 is in an open state and the first valve 32 is in a closed state.

[0047] In one embodiment, the sodium nitrite dissolving kettle further includes a thermometer, which is disposed in the first cavity 11 and is used to detect the temperature of the sodium nitrite in the first cavity 11 .

[0048] In this embodiment, in order to monitor the temperature of sodium nitrite in the first cavity 11 in real time, a thermometer is further provided. The thermometer is located in the first cavity 11, so that the temperature of the material can be monitored in real time by the thermometer.

[0049] In one embodiment, the sodium nitrite dissolving kettle further includes a ventilation pipe and an air pump, one end of the ventilation pipe is connected to the first cavity 11, and the air pump is arranged on the ventilation pipe.

[0050] In this embodiment, when the reactor 1 needs to be cleaned, since harmful gases remain in the reactor 1, in order to avoid harm to health, the sodium nitrite dissolving kettle is also provided with a ventilation pipe and an air pump, through which air can be continuously injected into the first cavity 11 to ensure the oxygen concentration in the first cavity 11.

[0051] In one embodiment, the sodium nitrite dissolving kettle also includes a liquid level meter and a solvent adding pipeline. The liquid level meter is arranged in the reactor 1, and the liquid level meter is used to detect the liquid level in the first cavity 11. The solvent adding pipeline is connected to the first cavity 11 and is used to transport the solvent to the first cavity 11.

[0052] In this embodiment, a liquid level meter is provided to monitor the liquid level of the material in the reactor 1 in real time, and a proper amount of solvent can be added to the first cavity 11 through the solvent adding pipeline according to the liquid level.

[0053] In one of the embodiments, a manhole communicating with the first cavity 11 is further provided on the top of the reactor 1 .

[0054] In this embodiment, in order to facilitate cleaning and maintenance, a manhole is further provided on the top of the reactor 1, through which a worker can enter the first cavity 11 for cleaning.

[0055] In order to better understand the present invention, the following Figure 1 The technical solution of the utility model is described in detail:

[0056] During specific use, sodium nitrite is first injected into the first cavity 11 through the feed port 13, and then the first valve 32 and the second valve 34 are opened, the third valve 42 is closed, and the material pump 35 is started. The material circulates in the first pipeline 31, the second pipeline 33 and the first cavity 11. After starting the cooling water circulation device 2, cooling water is continuously injected into the second cavity 12. The temperature of the sodium nitrite is reduced by heat exchange between the cooling water and the sodium nitrite in the first cavity 11. When the temperature is reduced to the set temperature, the first valve 32 and the third valve 42 are opened, the second valve 34 is closed, and the material pump 35 is started, so that the sodium nitrite that meets the temperature can be transported to the oximation methylation reactor.

[0057] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A sodium nitrite dissolving kettle, characterized in that, It includes: A reactor, comprising a first cavity and a second cavity which are sequentially sleeved from the inside to the outside, the reactor is also provided with a feed inlet, a discharge port and a return port which are connected to the first cavity, and the discharge port is used to connect with the oximation methylation reactor; a cooling water circulation device, connected to the second cavity, and used for conveying cooling water to the second cavity; and A circulation pipeline, with two ends respectively connected to the discharge port and the return port, and the circulation pipeline is used to circulate the sodium nitrite in the first cavity.

2. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The circulation pipeline includes a first pipeline, a first valve, a second pipeline, a second valve and a material pump, the first end of the first pipeline is connected to the discharge port, the second end of the first pipeline is connected to one end of the second pipeline, the other end of the second pipeline is connected to the return port, the first valve and the material pump are arranged on the first pipeline, and the second valve is arranged on the second pipeline.

3. The sodium nitrite dissolving kettle according to claim 2, characterized in that, The sodium nitrite dissolving kettle also includes a discharge pipeline, which includes a third pipeline and a third valve. One end of the third pipeline is connected to the second end of the first pipeline, and the other end of the third pipeline is connected to the oximation methylation reactor. The third valve is arranged on the third pipeline.

4. The sodium nitrite dissolving kettle according to claim 3, characterized in that, The diameters of the first pipe, the second pipe and the third pipe are the same.

5. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The feed inlet and the return feed inlet are located at the top of the reactor, and the discharge port is located at the bottom of the reactor.

6. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The sodium nitrite dissolving kettle further comprises a drain pipe and a fourth valve, wherein the drain pipe is connected to the discharge port, and the fourth valve is arranged on the drain pipe.

7. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The sodium nitrite dissolving kettle further comprises a thermometer, which is disposed in the first cavity and is used to detect the temperature of the sodium nitrite in the first cavity.

8. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The sodium nitrite dissolving kettle further comprises a ventilation pipe and an air pump, one end of the ventilation pipe is in communication with the first cavity, and the air pump is arranged on the ventilation pipe.

9. The sodium nitrite dissolving kettle according to claim 1, characterized in that, The sodium nitrite dissolving kettle also includes a liquid level meter and a solvent adding pipeline. The liquid level meter is arranged in the reaction kettle and is used to detect the liquid level in the first cavity. The solvent adding pipeline is connected to the first cavity and is used to transport the solvent to the first cavity.

10. The sodium nitrite dissolving kettle according to claim 1, characterized in that: The top of the reactor is also provided with a manhole connected to the first cavity.

Images