A 1,4-butynediol rectification column system

Abstract

The utility model discloses a 1,4-butynediol rectification tower system, the crude butynediol storage tank's discharge gate is linked with crude butynediol delivery pump feed port, and crude butynediol delivery pump discharge gate is connected with the feed port of 1,4-butynediol stripping tower in proper order through bag filter no.

Description

Technical Field

[0001] This utility model relates to the field of chemical distillation technology, and in particular to a 1,4-butynediol distillation column system. Background Technology

[0002] The butynediol distillation column (BYD distillation column) is the core separation equipment in the process of producing 1,4-butanediol (BDO) by the acetylene aldehyde method. It is mainly used to purify 1,4-butynediol (BYD) intermediates to ensure high yield and product quality in subsequent hydrogenation reactions.

[0003] The main task of the butynediol distillation column is to effectively separate the light components (such as methanol, propynyl alcohol, and water) and heavy components (such as high-boiling polymers) in the BYD concentrate to obtain high-purity BYD products, providing qualified raw materials for subsequent hydrogenation to produce BDO.

[0004] Currently, in the domestic 1,4-butynediol distillation column process, the bottom liquid of the butynediol distillation column is handled by pumping it through a circulating pump to a heat exchanger for cooling before being transported to the intermediate tank area. During the pumping process, heat is wasted from the high-temperature material in the bottom of the column. Simultaneously, the high-temperature material exchanges heat with the circulating water, and the high temperature of the material increases the rate of scaling on the circulating water heat exchanger, affecting its service life. Utility Model Content

[0005] The purpose of this invention is to overcome the deficiencies of existing technologies and provide a 1,4-butynediol distillation column system to solve the problems of heat source waste and heat exchanger service life in the existing process system of butynediol distillation column, achieve efficient heat recovery and utilization, reduce operating costs, and extend equipment service life.

[0006] This utility model is achieved through the following technical solution: A 1,4-butynediol distillation column system includes a crude butynediol storage tank, a crude butynediol transfer pump, a bag filter, a column bottom heat exchanger, a 1,4-butynediol stripping column, a butynediol stripping column reboiler, a 1,4-butynediol stripping column bottom circulation pump, a bag filter, a column bottom cooler, and an intermediate storage tank. The outlet of the crude butynediol storage tank is connected to the inlet of the crude butynediol transfer pump. The outlet of the crude butynediol transfer pump passes through the first bag filter, the tube side of the tower bottom heat exchanger, and is connected to the inlet of the 1,4-butynediol stripping tower. The bottom material of the 1,4-butynediol stripping column is heated in the reboiler to form a gas-liquid mixture, which is then returned to the 1,4-butynediol stripping column. The more volatile components in the mixture move countercurrently upwards and are further separated and purified by the column trays before being discharged from the top of the column. The bottom material yields qualified butynediol product. The qualified butynediol flows from the bottom outlet of the 1,4-butynediol stripping column sequentially through the bottom circulation pump, bag filter II, the shell side of the bottom heat exchanger, and the bottom cooler before entering the intermediate storage tank.

[0007] The crude butyne glycol storage tank serves as a temporary storage unit for the system's raw materials. Equipped with a nitrogen-sealing protection device, it effectively isolates the material from air, preventing oxidation and deterioration, and ensuring stable material composition. The tank is equipped with level, temperature, and pressure sensors, which are monitored and controlled in real-time by a DCS control system to ensure safe material storage. Similar in function to intermediate storage tanks, both serve as temporary material storage; however, the former stores raw materials, while the latter receives processed materials.

[0008] Bag filters one and two use three sets of parallel high-precision polypropylene filter bags with a filtration accuracy of 5μm, which can effectively intercept mechanical impurities and polymer particles in the material, ensuring the cleanliness of the material entering the subsequent unit.

[0009] The tower bottom heat exchanger utilizes the high-temperature materials from subsequent processes as a heat source to preheat the filtered crude butyrynne diol, achieving efficient heat recovery and utilization, significantly reducing steam consumption. Simultaneously, insulation devices are added to the pipelines inlet and outlet of the tower bottom heat exchanger to reduce heat loss, effectively improving the system's energy efficiency and reducing operating costs. Intelligent self-regulating valves are installed on the pipelines inlet and outlet of the tower bottom heat exchanger to automatically adjust the material flow rate and precisely control the material temperature.

[0010] The heat supply for the bottom of the 1,4-butynediol distillation column is provided by 2.0 MPa high-pressure steam via the butynediol stripping reboiler. The stable heat source ensures that the material in the distillation column can be fully stripped and separated, guaranteeing the efficient operation of the distillation process.

[0011] The bottom cooler of the tower deeply cools the material to ensure that the material temperature meets the storage requirements of the intermediate storage tank.

[0012] The working principle is as follows: (a) Raw material storage and transportation Crude butyne glycol is drawn from the crude butyne glycol storage tank by a crude butyne glycol transfer pump and then transported to the subsequent processing unit. (ii) Impurity filtration Before entering the bottom heat exchanger of the 1,4-butynediol, it is first filtered through a bag filter to remove impurities. The bag filter effectively intercepts mechanical impurities and polymer particles in the material, ensuring the cleanliness of the material entering subsequent units. During the material circulation through the bottom of the 1,4-butynediol stripping tower, it undergoes a second filtration through a bag filter to further ensure the purity of the material. (III) Heat Exchange and Distillation Preheating process: The filtered crude butyne diol enters the tower bottom heat exchanger, which uses the high-temperature material in the subsequent process as a heat source to preheat the crude butyne diol, achieving efficient heat recovery and utilization, and significantly reducing steam consumption. Distillation process: Preheated crude butynediol is sent to the 1,4-butynediol stripping column. The heat supply for the bottom of the 1,4-butynediol distillation column is provided by 2.0 MPa high-pressure steam via the butynediol stripping column reboiler. The stable heat source ensures that the material in the distillation column can be fully stripped and separated, guaranteeing the efficient operation of the distillation process. (iv) Material handling in the tower bottom The bottom material of the 1,4-butynediol stripping column is heated in the reboiler to form a gas-liquid mixture, which is then returned to the 1,4-butynediol stripping column. The more volatile components in the mixture move countercurrently upwards and are further separated and purified by the column trays before being discharged from the top of the column. The bottom material yields qualified butynediol. The qualified butynediol flows sequentially from the bottom outlet of the 1,4-butynediol stripping column through the bottom circulation pump, bag filter II, the shell side of the bottom heat exchanger, and the bottom outlet cooler before entering the intermediate storage tank. The bottom outlet cooler deeply cools the material to ensure that the material temperature meets the storage requirements of the intermediate storage tank.

[0013] The advantages of this utility model are: 1. Heat recovery and utilization: This utility model uses the high-temperature material in the subsequent process to preheat the crude butyrynethi glycol through the tower bottom heat exchanger, and the tower bottom material exchanges heat with the newly entering material during the circulation process, thereby achieving efficient heat recovery and utilization, greatly reducing steam consumption and operating costs. 2. Reduced scale buildup in heat exchangers: This invention avoids direct heat exchange between high-temperature materials and circulating water, reducing the rate of scale buildup in circulating water heat exchangers, extending the service life of heat exchangers, and lowering equipment maintenance costs.

[0014] 3. Improve material stability: The crude butyne diol storage tank (1) of this utility model is equipped with a nitrogen sealing protection device and is equipped with liquid level, temperature and pressure sensors that are monitored and controlled in real time by the DCS control system, which ensures the stability of material composition and improves the safety and stability of the production process. 4. Ensure material cleanliness: The material is filtered twice with high precision using bag filters, effectively intercepting mechanical impurities and polymer particles in the material, ensuring the cleanliness of the material entering subsequent units and improving product quality.

[0015] 5. This utility model has been innovatively improved by optimizing the heat recovery path and innovating the equipment function configuration to build a new high-efficiency and energy-saving process system, realizing the cascade utilization of liquid heat energy in the tower bottom, reducing energy consumption costs, and improving the green level and market competitiveness of the 1,4-butanediol production process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of 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.

[0018] like Figure 1 The diagram illustrates a process system for a 1,4-butynediol distillation column. The system includes a crude butynediol storage tank 1, from which material is transported by a crude butynediol transfer pump 2. The material is first filtered for impurities using a bag filter 3, then enters a bottom heat exchanger 4 for heat exchange and heating, before being sent to a 1,4-butynediol stripping column 5. The bottom material of the 1,4-butynediol stripping column 5 is heated in a butynediol stripping column reboiler 6 to form a gas-liquid mixture, which returns to the 1,4-butynediol stripping column 5. The more volatile components in the mixture move countercurrently upwards, undergoing further separation and purification on the column trays before finally being discharged from the top of the column. The bottom material yields qualified butynediol product. Qualified butynediol exits from the bottom outlet of 1,4-butynediol stripping tower 5, is pressurized by the bottom circulation pump 7 of 1,4-butynediol stripping tower, undergoes secondary filtration through bag filter 8, enters the tower bottom heat exchanger 4 for heat exchange, and is finally cooled by the tower bottom outlet cooler 9 before being transported to the intermediate storage tank 10.

[0019] Crude butyne diol storage tank 1 serves as a temporary storage unit for the system's raw materials. It is equipped with a nitrogen-sealing protection device to effectively isolate the material from air, prevent oxidation and deterioration, and ensure the stability of the material composition. The tank is equipped with level, temperature, and pressure sensors, which are monitored and controlled in real time by a DCS control system to ensure the safety of material storage.

[0020] Bag filters one and two use three sets of parallel high-precision polypropylene filter bags with a filtration accuracy of 5μm, which can effectively intercept mechanical impurities and polymer particles in the material, ensuring the cleanliness of the material entering the subsequent unit.

[0021] The tower bottom heat exchanger utilizes the high-temperature materials from subsequent processes as a heat source to preheat the filtered crude butyrynne diol, achieving efficient heat recovery and utilization, significantly reducing steam consumption. Simultaneously, insulation is added to the pipelines inlet and outlet of the tower bottom heat exchanger to reduce heat loss, effectively improving the system's energy efficiency and reducing operating costs. Intelligent self-regulating valves are installed on the pipelines inlet and outlet of the tower bottom heat exchanger to automatically adjust the material flow rate and precisely control the material temperature.

[0022] The heat supply for the bottom of the 1,4-butynediol distillation column is provided by 2.0 MPa high-pressure steam via the butynediol stripping reboiler. The stable heat source ensures that the material in the distillation column can be fully stripped and separated, guaranteeing the efficient operation of the distillation process.

[0023] The bottom cooler of the tower deeply cools the material to ensure that the material temperature meets the storage requirements of the intermediate storage tank.

[0024] Raw material storage and transportation stage: Crude butyne glycol is stored in crude butyne glycol storage tank 1. The nitrogen sealing protection device is activated to isolate air and ensure the stability of the material composition. The DCS control system monitors the liquid level, temperature, and pressure in the tank in real time. When the liquid level reaches the set value, the crude butyne glycol transfer pump 2 is activated to transport the crude butyne glycol to bag filter 3.

[0025] Impurity filtration stage Crude butyne diol enters bag filter 3. Mechanical impurities and polymer particles in the material are intercepted by 3 sets of parallel high-precision polypropylene filter bags, with a filtration accuracy of 5μm. The filtered clean material enters the tower bottom heat exchanger 4. Heat exchange and distillation stage: In the bottom heat exchanger 4, the high-temperature material from subsequent processes is used as a heat source to preheat the filtered crude butyrynethiol. An intelligent self-regulating valve automatically adjusts the material flow rate based on the material temperature to ensure effective preheating. Simultaneously, the insulation layers on the pipelines entering and exiting the bottom heat exchanger 4 function to reduce heat loss. The preheated crude butyne diol enters the 1,4-butyne diol stripping tower 5. High-pressure steam at 2.0 MPa provides stable heat to the tower bottom via the butyne diol stripping tower reboiler 6. The material undergoes thorough stripping separation in the distillation tower, achieving countercurrent contact between the gas and liquid phases for interphase heat and mass transfer. Material handling stage in the reboiler: The bottom material of the 1,4-butynediol distillation column 5 undergoes heat exchange in the reboiler 6 of the butynediol stripping column. A portion is returned to the 1,4-butynediol stripping column 5 to maintain material circulation and mass transfer efficiency. The other portion is pressurized by the bottom circulation pump 7 of the 1,4-butynediol stripping column, filtered twice by the bag filter 8, and then enters the bottom heat exchanger 4 to exchange heat with the newly entering crude butynediol. After heat exchange, the material enters the bottom cooler 9 of the column and is cooled to a temperature that meets the storage requirements of the intermediate storage tank 10. Then, it is transported to the intermediate storage tank 10 for storage, thus completing the entire process of the 1,4-butynediol distillation column. The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 1,4-butynediol distillation column system, characterized in that, It includes a crude butynediol storage tank, a crude butynediol transfer pump, a bag filter, a tower bottom heat exchanger, a 1,4-butynediol stripping tower, a butynediol stripping tower reboiler, a 1,4-butynediol stripping tower bottom circulation pump, a bag filter, a tower bottom cooler, and an intermediate storage tank. The outlet of the crude butynediol storage tank is connected to the inlet of the crude butynediol transfer pump. The outlet of the crude butynediol transfer pump passes through the first bag filter, the tube side of the tower bottom heat exchanger, and is connected to the inlet of the 1,4-butynediol stripping tower. The bottom material of the 1,4-butynediol stripping tower is heated by the butynediol stripping tower reboiler to form a gas-liquid mixture, which is then returned to the 1,4-butynediol stripping tower. The bottom outlet of the 1,4-butynediol stripping tower is connected in sequence to the bottom circulation pump of the 1,4-butynediol stripping tower, bag filter II, the shell side of the tower bottom heat exchanger, the tower bottom outlet cooler, and the feed inlet of the intermediate storage tank.

2. The 1,4-butynediol distillation column system according to claim 1, characterized in that, The crude butyne diol storage tank is equipped with a nitrogen sealing protection device.

3. The 1,4-butynediol distillation column system according to claim 1, characterized in that, The crude butyne diol storage tank is equipped with a level sensor, a temperature sensor, and a pressure sensor, and the level, temperature, and pressure are monitored and controlled in real time by a DCS control system.

4. The 1,4-butynediol distillation column system according to claim 1, characterized in that, Both bag filter one and bag filter two use three sets of parallel high-precision polypropylene filter bags, with a filtration accuracy of 5μm.

5. A 1,4-butynediol distillation column system according to claim 1, characterized in that, The heat source for the 1,4-butynediol stripping tower is provided by 2.0 MPa high-pressure steam through the butynediol stripping tower reboiler.

6. A 1,4-butynediol distillation column system according to claim 1, characterized in that, Insulation devices and intelligent self-regulating valves are installed on the pipelines of the aforementioned tower bottom heat exchanger.

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