Splitting system and rectification system

Abstract

The utility model discloses a kind of shunting system and rectification system, it is related to rectification equipment technical field.The system includes gas phase shunting subsystem and waste liquid shunting subsystem.Gas phase shunting subsystem includes parallelly connected first gas phase pipeline and second gas phase pipeline, respectively with control valve, connects rectification tower gas phase discharge outlet with high tank, low tank.Waste liquid shunting subsystem uses parallelly connected first waste liquid pipeline and second waste liquid pipeline, respectively with control valve, connects waste liquid discharge outlet with sewage discharge point, reprocessing equipment.System is equipped with temperature sensor and control module, according to temperature signal automatic control valve opening and closing, realize the automatic separation of high and low concentration methanol and the intelligent shunting of waste liquid.The utility model solves the problem that product concentration is unstable in traditional rectification and waste liquid discharge exceeds standard, improves product purity and recovery efficiency, reduces energy consumption and environmental protection risk, with the advantages of high control precision, fast response, reliable operation etc.

Description

Technical Field

[0001] This utility model relates to the field of distillation equipment technology, and in particular to a distillation system and a distillation system. Background Technology

[0002] In solvent recovery processes in industries such as chemicals and pharmaceuticals, distillation is a commonly used and key technology for separating and purifying organic solvents such as methanol. The precision of the distillation process control directly affects product quality, recovery rate, energy consumption, and environmental compliance.

[0003] Traditional methanol solvent distillation systems typically operate with a single vapor-phase outlet at the top of the distillation column, coupled with a condenser. This method suffers from unstable methanol concentrations in the produced liquid, often falling below the target value (e.g., 85%), impacting product quality and recovery efficiency. Furthermore, the waste liquid generated after distillation is usually discharged through a single pipeline after cooking, leading to solvent waste and potentially causing methanol residues in the waste liquid to exceed standards (e.g., above 2000 ppm), resulting in environmental pollution risks and penalties.

[0004] Therefore, there is an urgent need in the field for a device to at least solve some of the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a diversion system and a distillation system to solve the problems existing in the prior art, thereby helping to improve product quality and reduce costs and increase efficiency.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a flow splitting system, including: a gas phase flow splitting subsystem, a gas phase temperature sensor, and a control module. The gas phase flow splitting subsystem includes a first gas phase pipeline and a second gas phase pipeline. One end of the first gas phase pipeline is connected to the gas phase outlet of a distillation column, and the other end is connected to a high-temperature tank. A first gas phase control valve is provided on the first gas phase pipeline. One end of the second gas phase pipeline is connected to the gas phase outlet, and the other end is connected to a low-temperature tank. A second gas phase control valve is provided on the second gas phase pipeline. The gas phase temperature sensor is used to detect the gas phase temperature. The control module automatically controls the opening and closing of the first gas phase control valve and the second gas phase control valve in response to the gas phase temperature; and / or It also includes a waste liquid diversion subsystem and a waste liquid temperature sensor. The waste liquid diversion subsystem includes a first waste liquid pipeline and a second waste liquid pipeline. One end of the first waste liquid pipeline is connected to the waste liquid outlet of the distillation column, and the other end is connected to the sewage discharge point. A first waste liquid control valve is installed on the first waste liquid pipeline. One end of the second waste liquid pipeline is connected to the waste liquid outlet, and the other end is connected to the reprocessing equipment. A second waste liquid control valve is installed on the second waste liquid pipeline. The waste liquid temperature sensor is used to detect the waste liquid temperature. The control module also automatically controls the opening and closing of the first waste liquid control valve and the second waste liquid control valve in response to the waste liquid temperature.

[0007] Preferably, the first gas phase control valve, the second gas phase control valve, the first waste liquid control valve, and the second waste liquid control valve are pneumatic valves or electric valves.

[0008] Preferably, when the gas phase temperature is lower than the first temperature threshold, the control module controls the first gas phase control valve to open and the second gas phase control valve to close; when the gas phase temperature signal is not lower than the first temperature threshold, the control module controls the first gas phase control valve to close and the control module controls the second gas phase control valve to open. When the waste liquid temperature is lower than the second temperature threshold, the control module controls the second waste liquid control valve to open and the first waste liquid control valve to close; when the waste liquid temperature signal is not lower than the second temperature threshold, the control module controls the second waste liquid control valve to close and the first waste liquid control valve to open.

[0009] Preferably, the first temperature threshold is 65~75℃; the second temperature threshold is 90~95℃.

[0010] This utility model also provides a distillation system, including: a distillation column and a diversion system as described above.

[0011] Preferably, it further includes a first condenser, a second condenser, a high-temperature tank, and a low-temperature tank, wherein the first gas phase pipeline, the first condenser, and the high-temperature tank are connected in sequence, and the second gas phase pipeline, the second condenser, and the low-temperature tank are connected in sequence.

[0012] Preferably, the distillation column includes a first cooking tank, a reboiler, and a distillation column body connected in sequence. The reboiler is connected to the distillation column body through two pipelines to form a closed loop. The waste liquid outlet is located on the first cooking tank. The first cooking tank has a first gas phase outlet and its first gas phase outlet is connected to the distillation column body.

[0013] Preferably, it further includes a wastewater tank and a second cooking tank, the first waste liquid pipeline is connected to the wastewater tank, the second waste liquid pipeline is connected to the cooking tank, and the second cooking tank has a second gas phase outlet and its second gas phase outlet is connected to the distillation column body.

[0014] The present invention achieves the following technical advantages over the prior art: This invention constructs the core structure of an intelligent diversion system by setting up parallel gas-phase and waste liquid diversion pipelines and control valves. It physically provides independent outflow paths for gaseous products of different concentrations and waste liquids of different compliance levels, solving the mixing and fluctuation problems caused by traditional single-pipe output. The control module automatically switches valves based on the key process parameter of temperature, ensuring that high-concentration methanol is accurately introduced into the high-concentration tank, thereby directly improving product quality and value; while non-compliant waste liquid is automatically guided to reprocessing equipment, eliminating the possibility of exceeding environmental emission standards from the system's structural design. Furthermore, this automated structure replaces traditional manual intervention, achieving precise control around the clock, significantly reducing labor costs and the risk of operational errors, and improving production efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the distillation system provided by this utility model; In the diagram: 1-Distillation column body; 2-First vapor phase pipeline; 3-First vapor phase control valve; 4-Second vapor phase pipeline; 5-First waste liquid pipeline; 6-Second vapor phase control valve; 7-Second waste liquid pipeline; 8-First waste liquid control valve; 9-Second waste liquid control valve; 10-First condenser; 11-High-temperature tank; 12-Second condenser; 13-Low-temperature tank; 14-First cooking tank; 15-Second cooking tank; 25-Reboiler; 26-Wastewater tank. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] The purpose of this invention is to provide a diversion system and a distillation system to solve the problems existing in the prior art, thereby helping to improve product quality and reduce costs and increase efficiency.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0021] Example 1 This utility model provides a flow splitting system, including: a gas phase flow splitting subsystem, a gas phase temperature sensor, and a control module. The gas phase flow splitting subsystem includes a first gas phase pipeline 2 and a second gas phase pipeline 4. One end of the first gas phase pipeline 2 is connected to the gas phase outlet of a distillation column, and the other end is connected to a high-temperature tank 11. A first gas phase control valve 3 is provided on the first gas phase pipeline 2. One end of the second gas phase pipeline 4 is connected to the gas phase outlet, and the other end is connected to a low-temperature tank 13. A second gas phase control valve 6 is provided on the second gas phase pipeline 4. The gas phase temperature sensor is used to detect the gas phase temperature. The control module automatically controls the opening and closing of the first gas phase control valve 3 and the second gas phase control valve 6 in response to the gas phase temperature; and / or It also includes a waste liquid diversion subsystem and a waste liquid temperature sensor. The waste liquid diversion subsystem includes a first waste liquid pipeline 5 and a second waste liquid pipeline 7. One end of the first waste liquid pipeline 5 is connected to the waste liquid outlet of the distillation column, and the other end is connected to the sewage discharge point. A first waste liquid control valve 8 is installed on the first waste liquid pipeline 5. One end of the second waste liquid pipeline 7 is connected to the waste liquid outlet, and the other end is connected to the reprocessing equipment (which can be a cooking tank for subsequent methanol purification of the waste liquid). A second waste liquid control valve 9 is installed on the second waste liquid pipeline 7. The waste liquid temperature sensor is used to detect the waste liquid temperature. The control module also automatically controls the opening and closing of the first waste liquid control valve 8 and the second waste liquid control valve 9 in response to the waste liquid temperature.

[0022] It is understood that the use of "and / or" in the above description indicates that the above embodiments have three specific implementation schemes. Scheme one involves only setting up a first gas phase pipeline 2 and a second gas phase pipeline 4 in parallel, and respectively installing a first gas phase control valve 3 and a second gas phase control valve 6, which are automatically controlled by the control module. The temperature sensor can be installed inside the distillation column to detect the gas phase temperature inside the distillation column, or it can be installed in the gas phase pipeline to detect the gas temperature inside the gas phase pipeline. It should be noted that when installed in the gas phase pipeline, it needs to be installed upstream of the control valve.

[0023] Option two involves setting up only a first waste liquid pipeline 5 and a second waste liquid pipeline 7 connected in parallel, and respectively installing a first waste liquid control valve 8 and a second waste liquid control valve 9, which are automatically controlled by the control module. The temperature sensor can be installed inside the distillation column to detect the temperature of the waste liquid inside the column (the inside of the distillation column can be the inside of the distillation column body 1, the inside of the reboiler 25, or the inside of the first cooking tank 14), or it can be installed in the waste liquid pipeline to detect the temperature of the waste liquid within the pipeline. It should be noted that if installed in the waste liquid pipeline, it must be positioned upstream of the control valve.

[0024] Option 3 involves setting up a first gas phase pipeline 2 and a second gas phase pipeline 4 connected in parallel, and connecting in series a first gas phase control valve 3 and a second gas phase control valve 6 that are automatically controlled by the control module, as well as a first waste liquid pipeline 5 and a second waste liquid pipeline 7 connected in parallel, and setting up a first waste liquid control valve 8 and a second waste liquid control valve 9 that are automatically controlled by the control module.

[0025] Solution 1 above solves the following problems: In traditional single-pipe extraction, gas phases of different concentrations are forced to mix, leading to unstable product concentrations. This embodiment provides independent outflow paths for gas phases of different concentrations through a physical structure of parallel pipelines at the gas phase outlet. The control module automatically switches valves based on temperature signals (concentration indicators), structurally ensuring that high-concentration products (such as ≥85% methanol) can be collected separately into the high-concentration tank 11, while low-concentration products are guided to the low-concentration tank 13, thereby fundamentally guaranteeing the purity and stability of the high-concentration products.

[0026] The principle is as follows: Since the boiling point of methanol is much lower than that of water, the lower the temperature of the gaseous mixture of methanol and water vapor, the higher the concentration of methanol in it, and vice versa.

[0027] Solution 2 above solves the following problems: Traditional single-pipe wastewater discharge methods cannot distinguish between compliant and non-compliant wastewater. This embodiment achieves automatic wastewater sorting through a parallel wastewater pipeline structure at the wastewater discharge outlet. The control module controls the valves based on the wastewater temperature (an indicator of evaporation rate), allowing fully evaporated, low-methanol-residue compliant wastewater to be directly discharged, while non-compliant wastewater is physically guided to reprocessing equipment. This structural diversion ensures that only compliant wastewater is discharged, eliminating the risk of exceeding environmental standards at the hardware level.

[0028] The principle is as follows: Since the boiling point of methanol is much lower than that of water, the lower the temperature of a liquid mixture of methanol and water, the higher the concentration of methanol in it, and vice versa.

[0029] Option 3 combines the advantages of both Option 1 and Option 2.

[0030] Furthermore, the aforementioned solution links temperature sensing and valve actuation through a control module, forming a closed-loop control system. This combination of hardware and control replaces traditional manual sampling and adjustment, achieving 24 / 7 uninterrupted automatic and precise control, significantly reducing labor costs and operational error rates.

[0031] In some embodiments, the first gas phase control valve, the second gas phase control valve, the first waste liquid control valve, and the second waste liquid control valve are pneumatic valves or electric valves.

[0032] In this embodiment, the temperature sensor transmits the detected temperature information to the control module. The control module generates a command based on the temperature information and a preset temperature threshold, and then controls the solenoid valve in the pneumatic valve or the motor in the electric valve to operate via an electrical signal, thereby controlling the opening and closing of the valve.

[0033] In some embodiments, when the gas phase temperature is lower than a first temperature threshold, the control module controls the first gas phase control valve 3 to open and the second gas phase control valve 6 to close; when the gas phase temperature signal is not lower than the first temperature threshold, the control module controls the first gas phase control valve 3 to close and the second gas phase control valve 6 to open; when the waste liquid temperature is lower than a second temperature threshold, the control module controls the second waste liquid control valve 9 to open and the first waste liquid control valve 8 to close; when the waste liquid temperature signal is not lower than the second temperature threshold, the control module controls the second waste liquid control valve 9 to close and the first waste liquid control valve 8 to open.

[0034] This embodiment ensures the absoluteness and thoroughness of the diversion from a control logic perspective, preventing cross-contamination of high and low concentration products or mixed discharge of compliant / non-compliant waste liquids due to the simultaneous opening of both valves. This guarantees the purity of product quality grading and the absolute compliance of waste liquid discharge. Simultaneously, for the gas phase pipeline, this control logic ensures that there is always a clear pressure relief channel at the top of the tower, avoiding the risk of system pressure buildup from a safety procedure perspective and enhancing the safety of equipment operation.

[0035] In some embodiments, the first temperature threshold is 65~75°C; the second temperature threshold is 90~95°C.

[0036] In this embodiment, the temperature thresholds for separating the gas phase and waste liquid are specifically defined as 65~75℃ and 90~95℃, respectively. These parameters provide a precise and repeatable execution benchmark for automated control. The first threshold (preferably 70℃) is a critical point determined based on the methanol-water system gas-liquid balance data to ensure a produced liquid concentration ≥85%, and fixing this parameter ensures the consistency of high-concentration product quality. The second threshold (preferably 95℃) is the optimal balance point found between ensuring the environmentally mandated requirement of methanol residue ≤2000ppm in the waste liquid and avoiding excessive boiling to save energy. Setting this parameter achieves the most economically optimal operation of the system under the premise of meeting emission standards.

[0037] Example 2 This utility model also provides a distillation system, including: a distillation column and the diversion system in Example 1.

[0038] This embodiment integrates the aforementioned diversion system and distillation column into a complete distillation system. Therefore, this embodiment is the same as Embodiment 1, also possessing three schemes, and has the same technical effects as Embodiment 1, which will not be repeated here.

[0039] In some embodiments, this embodiment also includes a first condenser 10, a second condenser 12, a high-temperature tank 11, and a low-temperature tank 13, with the first gas phase pipeline 2, the first condenser 10, and the high-temperature tank 11 connected in sequence, and the second gas phase pipeline 4, the second condenser 12, and the low-temperature tank 13 connected in sequence.

[0040] This embodiment further defines the gas phase pipeline as connecting an independent condenser and product tank. The beneficial effect of this structure is that it establishes completely independent and non-interfering subsequent processing and storage channels for products of different concentrations. This physical isolation fundamentally eliminates the possibility of high-concentration methanol and low-concentration methanol mixing during condensation and storage, ensuring the purity of product grading. Furthermore, the independent storage tanks facilitate direct packaging of high-value products and the reuse of low-concentration products, achieving refined material management and maximizing value utilization.

[0041] In some examples, in scenarios with smaller production capacity or less stringent requirements for product purity, the two gas phases can share a condenser with sufficient heat exchange area to save costs. However, they must maintain their own independent liquid phase outlet pipes and product storage tanks to maintain the core function of staged collection.

[0042] In some embodiments, the distillation column includes a first digester 14, a reboiler 25, and a distillation column body 1 connected in sequence. The reboiler 25 is connected to the distillation column body 1 through two pipelines to form a closed loop. The waste liquid outlet is located on the first digester 14. The first digester 14 has a first gas phase outlet, and its first gas phase outlet is connected to the distillation column body 1.

[0043] This embodiment defines the specific structure in which the distillation column body 1 is connected to the first cooking tank 14 and the reboiler 25 in a closed-loop circulation manner.

[0044] The distillation column body 1 is equipped with trays or packing to increase the contact area between the gas and liquid phases. Gaseous material (such as methanol and water vapor) from the reboiler 25 rises from the bottom of the column, while liquid material (reflux liquid) condensed and returned from the top descends. Inside the column, the rising gas phase and the descending liquid phase come into countercurrent contact, exchanging heat and mass. The more volatile component (methanol) continuously accumulates in the gas phase, while the less volatile component (water) continuously accumulates in the liquid phase. After multiple stages of equilibrium, a high-concentration methanol gas phase is obtained at the top of the column, while a waste liquid with a high water content is obtained at the bottom. The function of the reboiler 25 is to heat the liquid material from the bottom of the column, causing partial vaporization and generating rising vapor. This vapor is the driving force for the gas flow within the distillation column body 1, providing the necessary gaseous medium for mass and heat transfer on the trays. Meanwhile, the unevaporated liquid is discharged as residue or continues to be circulated for heating. The first cooking tank 14 performs preliminary cooking on the waste liquid discharged from the reboiler 25, achieving initial methanol recovery and initial concentration of the waste liquid. The vaporized methanol vapor can be returned to the main body of the distillation column 1 for further purification, thereby maximizing solvent recovery. After cooking, the methanol content in the waste liquid is significantly reduced, and the waste liquid itself is further concentrated.

[0045] In some embodiments, the system further includes a wastewater tank 26 and a second digester 15, with a first waste liquid pipe 5 connected to the wastewater tank 26 and a second waste liquid pipe 7 connected to the digester. The second digester 15 has a second vapor outlet and its second vapor outlet is connected to the distillation column body 1.

[0046] This embodiment clearly defines the destination of the diverted wastewater as wastewater tank 26 and the second digester 15. The beneficial effect of this structure is that substandard wastewater is automatically guided to the second digester 15 for subsequent distillation and purification to fully recover methanol from the wastewater. This structured safety loop is the fundamental mechanism to ensure that the system's wastewater discharge meets environmental protection requirements. Simultaneously, the second digester 15, as a recovery unit, can further extract and recover methanol solvent from the substandard wastewater, directly improving the overall recovery rate of raw materials and bringing additional economic benefits.

[0047] Of course, the reprocessing equipment is not limited to the second digester 15, but can also be another small distillation unit or other types of solvent recovery equipment. Its core is to provide a mandatory reprocessing path for non-compliant waste liquid, rather than direct discharge.

[0048] In some embodiments, the gas phase temperature sensor is located in the top space of the distillation column body 1 or in the gas phase pipeline; the waste liquid temperature sensor is located in the first cooking tank 14.

[0049] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A diversion system, characterized in that: include: A gas phase splitting subsystem includes a first gas phase pipeline and a second gas phase pipeline. One end of the first gas phase pipeline is connected to the gas phase outlet of the distillation column, and the other end is connected to the high-temperature tank. A first gas phase control valve is provided on the first gas phase pipeline. One end of the second gas phase pipeline is connected to the gas phase outlet, and the other end is connected to the low-temperature tank. A second gas phase control valve is provided on the second gas phase pipeline. A gas phase temperature sensor is used to detect the gas phase temperature. A control module, which controls the opening and closing of the first gas phase control valve and the second gas phase control valve in response to the gas phase temperature; and / or The waste liquid diversion subsystem includes a first waste liquid pipeline and a second waste liquid pipeline. One end of the first waste liquid pipeline is connected to the waste liquid outlet of the distillation column, and the other end is connected to the sewage discharge point. A first waste liquid control valve is provided on the first waste liquid pipeline. One end of the second waste liquid pipeline is connected to the waste liquid outlet, and the other end is connected to the reprocessing equipment. A second waste liquid control valve is provided on the second waste liquid pipeline. Waste liquid temperature sensor, used to detect waste liquid temperature; The control module also controls the opening and closing of the first waste liquid control valve and the second waste liquid control valve in response to the waste liquid temperature.

2. The diversion system according to claim 1, characterized in that: The first gas phase control valve, the second gas phase control valve, the first waste liquid control valve, and the second waste liquid control valve are pneumatic valves or electric valves.

3. The diversion system according to claim 1, characterized in that: When the gas phase temperature is lower than the first temperature threshold, the control module controls the first gas phase control valve to open and the second gas phase control valve to close; when the gas phase temperature is not lower than the first temperature threshold, the control module controls the first gas phase control valve to close and the second gas phase control valve to open. When the waste liquid temperature is lower than the second temperature threshold, the control module controls the second waste liquid control valve to open and the first waste liquid control valve to close; when the waste liquid temperature is not lower than the second temperature threshold, the control module controls the second waste liquid control valve to close and the first waste liquid control valve to open.

4. The diversion system according to claim 3, characterized in that: The first temperature threshold is 65~75℃; the second temperature threshold is 90~95℃.

5. A distillation system, characterized in that: include: The distillation column and the diversion system according to any one of claims 1 to 4.

6. The distillation system according to claim 5, characterized in that: It also includes a first condenser, a second condenser, a high-temperature tank, and a low-temperature tank. The first gas phase pipeline, the first condenser, and the high-temperature tank are connected in sequence, and the second gas phase pipeline, the second condenser, and the low-temperature tank are connected in sequence.

7. The distillation system according to claim 6, characterized in that: The distillation column includes a first cooking tank, a reboiler, and a distillation column body connected in sequence. The reboiler is connected to the distillation column body through two pipelines to form a closed loop. The waste liquid outlet is located on the first cooking tank. The first cooking tank has a first gas phase outlet and its first gas phase outlet is connected to the distillation column body.

8. The distillation system according to claim 7, characterized in that: It also includes a wastewater tank and a second cooking tank. The first waste liquid pipeline is connected to the wastewater tank, and the second waste liquid pipeline is connected to the cooking tank. The second cooking tank has a second gas phase outlet and its second gas phase outlet is connected to the distillation column body.

9. The distillation system according to claim 7, characterized in that: The gas phase outlet is located at the top of the distillation column body, and the bottom of the distillation column body is provided with a liquid outlet connected to the reboiler.

10. The distillation system according to claim 7, characterized in that: The gas phase temperature sensor is installed in the top space of the distillation column or in the gas phase pipeline; the waste liquid temperature sensor is installed in the first cooking tank.

Images