Amidation reaction product fractionation device and imidazoline intermediate production system

Abstract

The invention relates to the technical field of chemical engineering, and discloses an amidation reaction product fractionation device and an imidazoline intermediate production system.The amidation reaction product fractionation device comprises a fractionation column with a fractionation cavity, and the upper end and the lower end of the fractionation column are provided with a first passing opening and a second passing opening which are communicated with the cavity respectively; the suction pipeline sequentially penetrates through the two passing openings from top to bottom and is fixed on the fractionating column; the device is provided with a first valve and a second valve, the first valve is located on the side, close to the first passing opening, in the fractionation cavity and is provided with a first opening, a second opening, a third opening and three states, and multiple communication modes of the suction pipeline and the cavity are achieved; the second valve is located on the side, close to the second passing opening, of the cavity and provided with a fourth opening, a fifth opening, a sixth opening and two states, and multiple communication modes are achieved. In addition, the first energy output end of the temperature adjusting device is connected with the fractionation cavity and used for controlling the temperature. The amidation reaction product fractionation device and the imidazoline intermediate production system provided by the invention are simple in structure and flexible in regulation and control, and can effectively realize efficient fractionation of the amidation reaction product.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical engineering, and particularly to a fractionation device for amide reaction products and an imidazoline intermediate production system. Background Art

[0002] The amide reaction is one of the important organic reactions for synthesizing surfactants. It mainly uses low-molecular amines as hydrophilic groups and high-carbon chains as hydrophobic groups, with betaine surfactant intermediates and imidazoline surfactant intermediates as representatives. Imidazoline intermediates are generally prepared by dehydrating hydroxyethyl ethylenediamine (AEEA) and fatty acids. Among them, the raw material AEEA is soluble in water and has a boiling point of 238 - 240°C, which can be removed by heating under full vacuum in the later stage. Therefore, in the feeding process, an excessive amount is generally adopted to improve the reaction conversion rate. However, in order to promote the forward progress of the reaction, the by-product water generated during the reaction is removed, which inevitably causes some AEEA to be removed together with the water.

[0003] To solve this problem, generally two methods are adopted in the existing production equipment: One: use a fractionation tube filled with packing, and the high-boiling AEEA is refluxed back through the resistance of the packing, while the low-boiling water will be evaporated; Two: through a three-way valve, an external vacuum tube is connected to the fractionation tube filled with packing, and the excessive unreacted AEEA is recovered by switching the pipeline through the three-way valve in the later stage, which is also a commonly used method in industrial production.

[0004] Currently, no matter which method is adopted during the production of imidazoline intermediates, there are certain defects. In the first method, it is necessary to switch the kettle body or replace the vacuum pipeline to remove the residual AEEA in the system, which increases the working steps and reduces the production efficiency; In the second method, the production efficiency is improved, but due to the use of a three-way valve for pipeline switching, at least two independent pipelines are required, resulting in a large floor area and space, and poor space utilization; Secondly, a large amount of AEEA and water are evaporated together in the early stage of the reaction, which easily leads to too high an AEEA content in the water and reduces the utilization rate of raw materials. Summary of the Invention

[0005] The object of the present invention is to provide a fractionation device for amide reaction products and an imidazoline intermediate production system. Through a circulation loop in which the water outlet of the reaction kettle, the fractionation device for amide reaction products, the AEEA detection device, the buffer tank, the circulation pump group, and the reaction kettle circulation return port are connected in sequence, it is possible to avoid the amide reaction product water from carrying away AEEA, causing waste of AEEA, and ensuring the utilization rate of AEEA in the amide reaction.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] The first aspect of the present invention provides a fractionation device for an amidation reaction product, comprising:

[0008] A fractionation column, which has a fractionation chamber inside. The upper and lower ends of the fractionation column are respectively provided with a first through-port and a second through-port, and both the first through-port and the second through-port are communicated with the fractionation chamber;

[0009] A suction pipeline, the end of which sequentially passes through the first through-port and the second through-port from top to bottom. The suction pipeline is fixedly connected to the fractionation column through the first through-port and the second through-port;

[0010] A first valve, which is installed on the suction pipeline and is located on the side of the fractionation chamber close to the first through-port. The first valve has a first opening, a second opening and a third opening. The first opening and the second opening are communicated with the suction pipeline. The first opening faces the first through-port. The third opening is communicated with the fractionation chamber. The first valve has a first state, a second state and a third state. When the first valve is in the first state, the second opening is communicated with the third opening; when the first valve is in the second state, the first opening is communicated with the third opening; when the first valve is in the third state, the first opening, the second opening and the third opening are communicated with each other;

[0011] A second valve, which is installed on the suction pipeline and is located on the side of the fractionation chamber close to the second through-port. The second valve has a fourth opening, a fifth opening and a sixth opening. The fourth opening and the fifth opening are communicated with the suction pipeline. The fourth opening faces the second through-port. The sixth opening is communicated with the fractionation chamber. The second valve has a fourth state and a fifth state. When the second valve is in the fourth state, the fifth opening is communicated with the sixth opening; when the second valve is in the fifth state, the fourth opening is communicated with the sixth opening;

[0012] A temperature adjustment device, which has a first energy output end, and the first energy output end is connected to the inside of the fractionation chamber.

[0013] Further, the fractionation chamber includes a cooling section and a storage section distributed in the up-down direction. The cooling section is filled with packing. The temperature adjustment device further has a second energy output end. The first energy output end is connected to the storage section, and the second energy output end is connected to the cooling section.

[0014] Further, the upper end of the suction pipeline is communicated with a vacuum pump group.

[0015] Furthermore, a heat insulation layer covers the outer peripheral wall of the fractionating column.

[0016] Furthermore, the first valve and the second valve have the same structure.

[0017] The second aspect of the present invention provides an imidazoline intermediate production system, including the amideification reaction product fractionation device described above, and comprising:

[0018] A reaction kettle, which has a water outlet and a circulation return port, and the water outlet is communicated with the lower end of the suction pipeline;

[0019] A buffer tank, which has a first liquid inlet end, a liquid outlet end and a first suction end. The upper end of the suction pipeline is communicated with the first liquid inlet end, the liquid outlet end is communicated with the circulation return port, and the suction end is communicated with the vacuum pump set;

[0020] A circulation pump set, which is connected between the circulation return port and the liquid outlet end;

[0021] An AEEA detection device, which is connected between the upper end of the suction pipeline and the first liquid inlet end.

[0022] Furthermore, the imidazoline intermediate production system further includes a storage tank, a third valve, a fourth valve, a fifth valve, a sixth valve, and a seventh valve. The upper end of the suction pipeline is connected with a connecting pipeline, and the connecting pipeline includes a main pipeline and two branch pipelines arranged at one end of the main pipeline. The other end of the main pipeline is connected with the upper end of the suction pipeline. The storage tank has a second liquid inlet end and a second suction end. The second liquid inlet end is communicated with the end of one of the branch pipelines, the second suction end is connected with the vacuum pump set, the first liquid inlet end is communicated with the end of the other branch pipeline, the AEEA detection device is arranged on the other branch pipeline, the third valve is arranged at the first liquid inlet end, the fourth valve is arranged at the liquid outlet end, the fifth valve is arranged at the first suction end, the sixth valve is arranged at the second liquid inlet end, and the seventh valve is arranged at the second suction end.

[0023] Furthermore, the imidazoline intermediate production system further includes a first pressure gauge and a second pressure gauge. The first pressure gauge is connected with the buffer tank, and the second pressure gauge is connected with the storage tank.

[0024] Furthermore, the imidazoline intermediate production system further includes a control component, which is electrically connected to the first valve, the second valve, the temperature adjustment device, the vacuum pump group, the circulation pump group, the AEEA detection device, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve, the first pressure gauge, and the second pressure gauge.

[0025] Furthermore, the imidazoline intermediate production system further includes a condensation device, which is arranged on the main pipeline.

[0026] Compared with the prior art, the amideification reaction product fractionation device and the imidazoline intermediate production system according to the embodiments of the present invention have the following beneficial effects: 1. Utilizing the multi-state design of the first valve and the second valve is conducive to separating and discharging the water of the amideification reaction product and AEEA dissolved in the product water, and ensuring that the amideification reaction product fractionation device remains sealed when not in use; 2. In the imidazoline intermediate production system, through the circulation loop formed by connecting the water outlet of the reaction kettle, the amideification reaction product fractionation device, the AEEA detection device, the buffer tank, the circulation pump group, and the reaction kettle circulation return port in sequence, it is possible to prevent the water of the amideification reaction product from carrying AEEA away, resulting in waste of AEEA, ensuring the recycling of AEEA in the amideification reaction, and improving the overall energy efficiency of the system; 3. The AEEA detection device monitors the AEEA concentration in the water flowing into the buffer tank, and can timely feedback and regulate the heat output of the temperature adjustment device, thereby reducing the AEEA concentration of the water input into the buffer tank and ensuring the utilization rate of AEEA. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the amideification reaction product fractionation device according to the embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of the first valve according to the embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of the second valve according to the embodiment of the present invention;

[0030] Figure 4 is a circuit connection diagram of the imidazoline intermediate production system according to the embodiment of the present invention;

[0031] In the figure, 1. Amideification reaction product fractionation device;

[0032] 101. Fractionating column; 1011. Fractionating chamber; 10111. Cooling section; 101111. Packing; 10112. Storage section; 10113. First through port; 10114. Second through port;

[0033] 102. Suction pipeline;

[0034] 103, First valve; 1031, First opening; 1032, Second opening; 1033, Third opening;

[0035] 104, Second valve; 1041, Fourth opening; 1042, Fifth opening; 1043, Sixth opening;

[0036] 105, Temperature regulating device; 1051, First energy output end; 1052, Second energy output end;

[0037] 106, Heat insulation layer;

[0038] 2, Vacuum pump group;

[0039] 3, Reactor; 301, Water outlet; 302, Circulation return port;

[0040] 4, Buffer tank; 401, First liquid inlet end; 402, Liquid outlet end; 403, First suction end;

[0041] 5, Circulation pump group;

[0042] 6, AEEA detection device;

[0043] 7, Storage tank; 701, Second liquid inlet end; 702, Second suction end;

[0044] 8, Third valve;

[0045] 9, Fourth valve;

[0046] 10, Fifth valve;

[0047] 11, Sixth valve;

[0048] 12, Seventh valve;

[0049] 13, First pressure gauge;

[0050] 14, Second pressure gauge;

[0051] 15, Control component;

[0052] 16, Condensing device;

[0053] 17, Connecting pipeline; 171, Main pipeline; 1711, Branch pipeline. Detailed implementation manners

[0054] The following combines the accompanying drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0055] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0056] In the description of the present invention, the terms "provided with", "set", "connected", "placed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0058] The technical solutions of the present invention will be further described below in conjunction with embodiments and drawings.

[0059] As Figures 1-4 shown, the first aspect of the embodiment of the present invention provides a fractionation device 1 for amide reaction products, including:

[0060] A fractionation column 101, the interior of the fractionation column 101 has a fractionation chamber 1011, and the upper and lower ends of the fractionation column 101 are respectively provided with a first through port 10113 and a second through port 10114, and both the first through port 10113 and the second through port 10114 are communicated with the fractionation chamber 1011;

[0061] A suction pipeline 102, the end of the suction pipeline 102 sequentially passes through the first through port 10113 and the second through port 10114 from top to bottom, and the suction pipeline 102 is fixedly connected to the fractionation column 101 through the first through port 10113 and the second through port 10114;

[0062] The first valve 103 is installed on the suction pipeline 102 and is located on the side of the fractionation chamber 1011 close to the first through port 10113. The first valve 103 has a first opening 1031, a second opening 1032 and a third opening 1033. The first opening 1031 and the second opening 1032 are communicated with the suction pipeline 102. The first opening 1031 faces the first through port 10113. The third opening 1033 is communicated with the fractionation chamber 1011. The first valve 103 has a first state, a second state and a third state. When the first valve 103 is in the first state, the second opening 1032 is communicated with the third opening 1033; when the first valve 103 is in the second state, the first opening 1031 is communicated with the third opening 1033; when the first valve 103 is in the third state, the first opening 1031, the second opening 1032 and the third opening 1033 are communicated with each other;

[0063] The second valve 104 is installed on the suction pipeline 102 and is located on the side of the fractionation chamber 1011 close to the second through port 10114. The second valve 104 has a fourth opening 1041, a fifth opening 1042 and a sixth opening 1043. The fourth opening 1041 and the fifth opening 1042 are communicated with the suction pipeline 102. The fourth opening 1041 faces the second through port 10114. The sixth opening 1043 is communicated with the fractionation chamber 1011. The second valve 104 has a fourth state and a fifth state. When the second valve 104 is in the fourth state, the fifth opening 1042 is communicated with the sixth opening 1043; when the second valve 104 is in the fifth state, the fourth opening 1041 is communicated with the sixth opening 1043;

[0064] The temperature regulating device 105 has a first energy output end 1051, and the first energy output end is connected inside the fractionation chamber 1011.

[0065] Specifically, a liquid level sensor is further provided inside the fractionation chamber 1011.

[0066] Based on the above technical solution, when the amideification reaction product fractionation device 1 is in an unused state, the first valve 103 is in the first state, the second valve 104 is in the fourth state, the first opening 1031 is not connected to the upper end of the suction pipeline 102, the fourth opening 1041 is not connected to the lower end of the suction pipeline 102, and the inside of the fractionation chamber 1011 is not connected to the outside, which is beneficial to the preservation of the amideification reaction product fractionation device 1. It can be directly enabled when needed without pre-cleaning. When the amideification reaction product fractionation device 1 needs to separate the product water of the amideification product and AEEA, the second valve 104 is first switched to the fifth state, and the product water after the reaction in the reaction kettle 3 is introduced into the fractionation chamber 1011 through the second valve 104. When the liquid level reaches the preset liquid level of the liquid level sensor, the second valve 104 is switched to the fourth state, and the product water after the reaction in the reaction kettle 3 is blocked by the second valve 104. At this time, the first valve 103 is switched to the second state, and the temperature adjustment device 105 starts to heat, so that water and AEEA with different boiling points start to separate. The water evaporates into water vapor and flows out of the fractionation chamber 1011 from the first valve 103. After the water vapor is completely evaporated, the first valve 103 is switched to the third state, and the temperature adjustment device 105 raises the temperature again to evaporate AEEA out of the fractionation chamber 1011, realizing the efficient and staged separation of water and AEEA.

[0067] Preferably, the fractionation chamber 1011 includes a cooling section 10111 and a storage section 10112 distributed in the up and down directions. The cooling section 10111 is filled with packing 101111. The temperature adjustment device 105 also has a second energy output end 1052. The first energy output end 1051 is connected to the storage section 10112, and the second energy output end 1052 is connected to the cooling section 10111.

[0068] By dividing the fractionation chamber 1011 into a cooling section 10111 and a storage section 10112, fine control of two different temperature regions can be achieved simultaneously, which is beneficial to more efficient separation according to the boiling point difference between water and AEEA. The packing 101111 filled in the cooling section 10111 significantly increases the local heat exchange area, making the temperature control in this area more uniform and stable, thus improving the accuracy and safety of the separation process. The dual energy output ends can supply energy to the storage section 10112 and the cooling section 10111 respectively, which not only optimizes the energy utilization rate, but also can flexibly adjust the heating or maintaining cooling state of the cooling section 10111 and the storage section 10112 according to different conditions, further improving the separation effect.

[0069] Preferably, a vacuum pump group 2 is connected to the upper end of the suction pipeline 102.

[0070] A negative pressure is formed at the upper end of the suction pipeline 102 by the vacuum pump group 2, effectively removing the gas in the fractionation chamber 1011, reducing the internal pressure, thereby accelerating the evaporation and discharge of water and AEEA, making the temperature control and the separation process of water and AEEA faster and more uniform, and improving the overall separation efficiency; by effectively reducing the pressure in the fractionation chamber 1011, the boiling points of water and AEEA are reduced, realizing efficient evaporation and separation at low temperatures, thereby reducing energy consumption and achieving an energy-saving effect.

[0071] Preferably, the outer peripheral wall of the fractionation column 101 is covered with a heat insulation layer 106. The heat insulation layer 106 can isolate the interference of the external environmental temperature, prevent external factors from affecting the fractionation process, and at the same time provide an additional physical protection for the fractionation column 101, improving the safety and stability of the device.

[0072] Preferably, the first valve 103 and the second valve 104 have the same structure.

[0073] Specifically, both the first valve 103 and the second valve 104 adopt a three-way T-shaped ball valve.

[0074] The first valve 103 and the second valve 104 adopting the same structure can simplify inventory management and reduce the complexity during maintenance and replacement; the unified valve structure reduces design differences, reduces the complexity of device commissioning and installation, and improves the reliability and stability of the device.

[0075] The second aspect of the embodiment of the present invention provides an imidazoline intermediate production system, including an amidation reaction product fractionation device 1, including:

[0076] A reaction kettle 3, the reaction kettle 3 has a water outlet 301 and a circulation return port 302, and the water outlet 301 is communicated with the lower end of the suction pipeline 102;

[0077] A buffer tank 4, the buffer tank 4 has a first liquid inlet end 401, a liquid outlet end 402 and a first suction end 403, the upper end of the suction pipeline 102 is communicated with the first liquid inlet end 401, the liquid outlet end 402 is communicated with the circulation return port 302, and the suction end is communicated with the vacuum pump group 2;

[0078] A circulation pump group 5, the circulation pump group 5 is connected between the circulation return port 302 and the liquid outlet end 402;

[0079] An AEEA detection device 6, the AEEA detection device 6 is connected between the upper end of the suction pipeline 102 and the first liquid inlet end 401.

[0080] Through the circulation loop that is successively connected by the water outlet 301 of the reactor 3, the amidation reaction product fractionation device 1, the AEEA detection device 6, the buffer tank 4, the circulation pump group 5, and the reactor 3 circulation return port 302, it is possible to prevent the water of the amidation reaction product from carrying away AEEA, resulting in waste of AEEA, ensure the recycling of AEEA in the amidation reaction, and improve the overall energy efficiency of the system; the AEEA detection device 6 monitors the AEEA concentration in the water flowing into the buffer tank 4, and can timely feedback and regulate the heat output of the temperature regulating device 105, thereby reducing the AEEA concentration of the water input into the buffer tank 4 and ensuring the utilization rate of AEEA.

[0081] More preferably, the imidazoline intermediate production system further includes a storage tank 7, a third valve 8, a fourth valve 9, a fifth valve 10, a sixth valve 11, a seventh valve 12. The upper end of the suction pipeline 102 is connected to a connecting pipeline 17. The connecting pipeline 17 includes a main pipeline 171 and two branch pipelines 1711 provided at one end of the main pipeline 171. The other end of the main pipeline 171 is connected to the upper end of the suction pipeline 102. The storage tank 7 has a second liquid inlet end 701 and a second suction end 702. The second liquid inlet end 701 is connected to the end of a branch pipeline 1711. The second suction end 702 is connected to the vacuum pump group 2. The first liquid inlet end 401 is connected to the end of the other branch pipeline 1711. The AEEA detection device 6 is provided on the other branch pipeline 1711. The third valve 8 is provided at the first liquid inlet end 401. The fourth valve 9 is provided at the liquid outlet end 402. The fifth valve 10 is provided at the first suction end 403. The sixth valve 11 is provided at the second liquid inlet end 701. The seventh valve 12 is provided at the second suction end 702.

[0082] The second suction end 702 of the storage tank 7 and the first suction end 403 of the buffer tank 4 are connected to the same vacuum pump group 2 to form a shared suction system. By sharing the vacuum pump group 2, the need for separately configuring multiple vacuum pumps is reduced, thereby reducing the equipment procurement and maintenance costs, and at the same time optimizing the equipment utilization rate.

[0083] More preferably, the imidazoline intermediate production system further includes a first pressure gauge 13 and a second pressure gauge 14. The first pressure gauge 13 is connected to the buffer tank 4, and the second pressure gauge 14 is connected to the storage tank 7.

[0084] By installing pressure gauges on the buffer tank 4 and the storage tank 7 respectively, the pressure states in each tank can be monitored in real time, ensuring that the system operates within a safe and stable pressure range, promptly detecting abnormal situations, and preventing equipment overpressure or unstable operation; the real-time feedback pressure data provides a basis for process control, enabling operators or the automatic control system to adjust the operation parameters according to the pressure changes, thereby optimizing the process flow, improving production efficiency, and product quality.

[0085] More preferably, the imidazoline intermediate production system further includes a control component 15, which is electrically connected to the first valve 103, the second valve 104, the temperature adjustment device 105, the vacuum pump group 2, the circulation pump group 5, the AEEA detection device 6, the third valve 8, the fourth valve 9, the fifth valve 10, the sixth valve 11, the seventh valve 12, the first pressure gauge 13, and the second pressure gauge 14.

[0086] The control component 15 is configured as follows: when the amide reaction product fractionation device 1 needs to separate the product water and AEEA of the amide reaction, the second valve 104 first switches to the fifth state, and the product water after the reaction in the reaction kettle 3 passes through the second valve 104 into the fractionation chamber 1011. When the liquid level reaches the preset liquid level of the liquid level sensor, the second valve 104 switches to the fourth state, and the product water after the reaction in the reaction kettle 3 is blocked by the second valve 104. At this time, the first valve 103 switches to the second state, and the temperature adjustment device 105 starts to heat. At the same time, the third valve 8 and the fifth valve 10 are opened, the fourth valve 9, the sixth valve 11, and the seventh valve 12 are closed, and the vacuum pump group 2 is started. The product water in the amide reaction product fractionation device 1 flows out from the upper end of the suction pipeline 102, passes through the AEEA detection device 6 and then enters the buffer tank 4. The AEEA detects the AEEA concentration of the product water flowing into the buffer tank 4 in real time, and the first pressure gauge 13 monitors the air pressure in the buffer tank 4 in real time. During a certain suction time, if it is detected that the AEEA concentration of the product water is too high, the vacuum pump group 2 is closed, the fifth valve 10 and the sixth valve 11 are closed, the fourth valve 9 is opened, the circulation pump group 5 is started, the vacuum pump group 2 is closed, and the product water in the buffer tank 4 is re-transported back to the reaction kettle 3 for reaction. Subsequently, it returns to the amide reaction product fractionation device 1 for fractionation and detection again, and the energy outputs of the first energy output end 1051 and the second energy output end 1052 of the temperature adjustment device 105 are adjusted to reduce the AEEA concentration in the separated product water until the detected AEEA concentration of the product water reaches the required value and the amide reaction product fractionation device 1 no longer evaporates water vapor. Then, the fourth valve 9, the fifth valve 10, the sixth valve 11, and the circulation pump group 5 are closed, the sixth valve 11 and the seventh valve 12 are opened, the vacuum pump group 2 is started, and the energy output amounts of the first energy output end 1051 and the second energy output end 1052 of the temperature adjustment device 105 are adjusted to reach the boiling point of AEEA. The evaporated AEEA flows into the storage tank 7 through the sixth valve 11 for storage, which is convenient for reuse later.

[0087] More preferably, the imidazoline intermediate production system further includes a condensation device 16, which is arranged on the main pipeline 171.

[0088] The condensation process helps to regulate the temperature in the main pipeline 171, prevent local overheating or fluctuations in temperature, maintain the overall temperature stability of the system, and is beneficial to the overall safety and stability of the system.

[0089] In summary, the embodiment of the present invention provides a fractionation device 1 for amide reaction products and an imidazoline intermediate production system. By using the multi-state design of the first valve 103 and the second valve 104, it is beneficial to separate and discharge the water of the amide reaction product and AEEA dissolved in the product water, and ensure that the fractionation device 1 for amide reaction products remains sealed when not in use; in the imidazoline intermediate production system, through the circulation loop in which the water outlet 301 of the reaction kettle 3, the fractionation device 1 for amide reaction products, the AEEA detection device 6, the buffer tank 4, the circulation pump group 5, and the circulation return port 302 of the reaction kettle 3 are sequentially connected, it is possible to avoid the water of the amide reaction product from carrying AEEA away, resulting in waste of AEEA, ensure the recycling of AEEA in the amide reaction, and improve the overall energy efficiency of the system; the AEEA detection device 6 monitors the AEEA concentration in the water flowing into the buffer tank 4, and can timely feedback and regulate the heat output of the temperature regulating device 105, thereby reducing the AEEA concentration of the water input into the buffer tank 4 and ensuring the utilization rate of AEEA.

[0090] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An amidation reaction product fractionation device, characterized in that: include: A fractionation column (101), wherein the fractionation column (101) has a fractionation chamber (1011) inside, and a first port (10113) and a second port (10114) are respectively provided at the upper and lower ends of the fractionation column (101), and the first port (10113) and the second port (10114) are both connected to the fractionation chamber (1011); A suction pipe (102), wherein the end of the suction pipe (102) passes through the first port (10113) and the second port (10114) in sequence from top to bottom, and the suction pipe (102) is fixedly connected to the fractionation column (101) via the first port (10113) and the second port (10114); a first valve (103), wherein the first valve (103) is installed on the suction pipe (102) and is located on a side of the fractionation chamber (1011) close to the first port (10113); the first valve (103) has a first opening (1031), a second opening (1032) and a third opening (1033); the first opening (1031) and the second opening (1032) are in communication with the suction pipe (102); the first opening (1031) faces the first port (10113); the third opening (1033) faces the fractionation chamber (1011) The first valve (103) is connected with the second opening (1031), the first valve (103) has a first state, a second state and a third state, when the first valve (103) is in the first state, the second opening (1032) is connected with the third opening (1033); when the first valve (103) is in the second state, the first opening (1031) is connected with the third opening (1033); when the first valve (103) is in the third state, the first opening (1031), the second opening (1032) and the third opening (1033) are connected; a second valve (104), the second valve (104) being installed on the suction pipe (102) and being located on a side of the fractionation chamber (1011) close to the second port (10114), the second valve (104) having a fourth opening (1041), a fifth opening (1042) and a sixth opening (1043), the fourth opening (1041) and the fifth opening (1042) being connected to the suction pipe (102), the fourth opening (1041) facing the Towards the second port (10114), the sixth opening (1043) is connected to the fractionation chamber (1011); the second valve (104) has a fourth state and a fifth state; when the second valve (104) is in the fourth state, the fifth opening (1042) is connected to the sixth opening (1043); when the second valve (104) is in the fifth state, the fourth opening (1041) is connected to the sixth opening (1043); A temperature regulating device (105), wherein the temperature regulating device (105) has a first energy output end (1051), and the first energy output end is connected to the distillation chamber (1011).

2. The amidation reaction product fractionation device according to claim 1, characterized in that: The distillation chamber (1011) comprises a cooling section (10111) and a storage section (10112) distributed in the up-down direction, the cooling section (10111) is filled with a filler (101111), and the temperature regulating device (105) further comprises a second energy output end (1052), the first energy output end (1051) is connected to the storage section (10112), and the second energy output end (1052) is connected to the cooling section (10111).

3. The amidation reaction product fractionation device according to claim 1, characterized in that: The upper end of the suction pipe (102) is connected to a vacuum pump group (2).

4. The amidation reaction product fractionation device according to claim 1, characterized in that: The outer peripheral wall of the fractionation column (101) is covered with a heat insulation layer (106).

5. The amidation reaction product fractionation device according to claim 1, characterized in that: The first valve (103) and the second valve (104) have the same structure.

6. An imidazoline intermediate production system, comprising an amidation reaction product fractionation device (1) as described in any one of claims 1 to 5, characterized in that ,include: A reaction kettle (3), wherein the reaction kettle (3) has a water outlet (301) and a circulation return port (302), and the water outlet (301) is connected to the lower end of the suction pipe (102); A buffer tank (4), the buffer tank (4) having a first liquid inlet end (401), a liquid outlet end (402) and a first suction end (403), the upper end of the suction pipe (102) being connected to the first liquid inlet end (401), the liquid outlet end (402) being connected to the circulation return port (302), and the suction end being connected to the vacuum pump group (2); A circulation pump group (5), the circulation pump group (5) being connected between the circulation return port (302) and the liquid outlet (402); An AEEA detection device (6), wherein the AEEA detection device (6) is connected between the upper end of the suction pipe (102) and the first liquid inlet end (401).

7. The imidazoline intermediate production system according to claim 6, characterized in that: The invention also comprises a storage tank (7), a third valve (8), a fourth valve (9), a fifth valve (10), a sixth valve (11), and a seventh valve (12); the upper end of the suction pipeline (102) is connected to a connecting pipeline (17); the connecting pipeline (17) comprises a main pipeline (171) and two branch pipelines (1711) arranged at one end of the main pipeline (171); the other end of the main pipeline (171) is connected to the upper end of the suction pipeline (102); the storage tank (7) has a second liquid inlet end (701) and a second suction end (702); the second liquid inlet end (701) is connected to an end of the branch pipeline (1711); , the second suction end (702) is connected to the vacuum pump group (2), the first liquid inlet end (401) is connected to the end of another branch pipeline (1711), the AEEA detection device (6) is arranged on another branch pipeline (1711), the third valve (8) is arranged at the first liquid inlet end (401), the fourth valve (9) is arranged at the liquid outlet end (402), the fifth valve (10) is arranged at the first suction end (403), the sixth valve (11) is arranged at the second liquid inlet end (701), and the seventh valve (12) is arranged at the second suction end (702).

8. The imidazoline intermediate production system according to claim 7, characterized in that: It also comprises a first pressure gauge (13) and a second pressure gauge (14), wherein the first pressure gauge (13) is connected to the buffer tank (4), and the second pressure gauge (14) is connected to the storage tank (7).

9. The imidazoline intermediate production system according to claim 8, characterized in that, The invention also includes a control component (15), wherein the control component (15) is electrically connected to the first valve (103), the second valve (104), the temperature regulating device (105), the vacuum pump group (2), the circulating pump group (5), the AEEA detection device (6), the third valve (8), the fourth valve (9), the fifth valve (10), the sixth valve (11), the seventh valve (12), the first pressure gauge (13), and the second pressure gauge (14).

10. The imidazoline intermediate production system according to claim 7, characterized in that: It also includes a condensing device (16), wherein the condensing device (16) is arranged on the main pipeline (171).

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