tert-butylphenol discharge treatment system

Abstract

This utility model relates to the field of tert-butylphenol production technology, specifically a tert-butylphenol discharge processing system. It includes a phenol storage tank, which is connected to a reaction vessel via a phenol preheating tank. The reaction vessel is connected to a primary distillation column via a crude product cooler. The primary distillation column is connected to a secondary distillation column via a distillation pump. The crude product cooler contains a crude product cooler coil, and the primary distillation column contains a primary distillation column condenser. A primary vacuum pipeline is connected to the top of the primary distillation column. This system uses a connecting pipe and an interconnecting valve group between the primary and secondary vacuum pipelines. The connecting pipe connects the primary distillation column trap to the primary distillation column and the secondary distillation column trap to the secondary distillation column. When blockage occurs in the primary or secondary vacuum pipelines under low-temperature conditions such as winter, the interconnecting valve group can be opened to connect the two vacuum pipelines and the blocked vacuum pipeline can be closed, thus maintaining a stable vacuum in the distillation system.

Description

Technical Field

[0001] This utility model relates to the field of tert-butylphenol production technology, specifically to a tert-butylphenol discharge processing system. Background Technology

[0002] tert-Butylphenol is an important organic chemical intermediate widely used in the rubber industry, plastics industry, pharmaceutical and chemical industries. It can be used as a raw material for antioxidants, ultraviolet absorbers, bactericides, etc. The stability and efficiency of its production process have a significant impact on product quality and production costs.

[0003] In the production of tert-butylphenol, the stable operation of the distillation system is crucial to ensuring product quality and yield. Existing equipment exhibits several problems in actual production: in low-temperature environments such as winter, the vacuum pipelines of the distillation system are prone to blockage due to material condensation and crystallization or impurity deposition, particularly in the pipelines before and after the traps in the first and second stage distillation columns, severely impacting the vacuum stability of the distillation system. Vacuum instability can lead to feed interruptions, fluctuations in product purity, and consequently affect the quality of finished and semi-finished products.

[0004] Meanwhile, due to the low ambient temperature, the raw materials phenol and isobutylene experience reduced fluidity and slow discharge rates during storage and transportation. This not only affects production efficiency but may also cause fluctuations in the feed rate to the reactor due to unstable raw material delivery, impacting reaction results and product quality. Furthermore, the waste heat generated during operation of the crude product cooler and the first-stage distillation column condenser in the existing unit is not effectively utilized, resulting in energy waste and increased production energy consumption. Utility Model Content

[0005] To address the shortcomings of the existing technology, the purpose of this invention is to provide a tert-butylphenol discharge treatment system. This system involves installing a connecting pipe and an interconnecting valve assembly between the primary and secondary vacuum pipelines. The connecting pipe connects the primary distillation column trap to the primary distillation column and the secondary distillation column trap to the secondary distillation column. When blockages occur in the primary or secondary vacuum pipelines under low-temperature conditions such as winter, the interconnecting valve assembly can be opened to connect the two vacuum pipelines, while the blocked vacuum pipeline can be closed, thus maintaining a stable vacuum in the distillation system.

[0006] This utility model is achieved using the following technical solution:

[0007] The tert-butylphenol discharge processing system includes a phenol storage tank, which is connected to a reaction vessel via a phenol preheating tank. The reaction vessel is connected to a primary distillation column via a crude product cooler. The primary distillation column is connected to a secondary distillation column via a distillation pump. The crude product cooler is equipped with a crude product cooler coil, and the primary distillation column is equipped with a primary distillation column condenser. A primary vacuum pipeline is connected to the top of the primary distillation column.

[0008] The phenol preheating tank is equipped with a phenol preheating tank coil, which is connected to the condenser of the first-stage distillation column through a pipeline. The waste heat of the first-stage distillation column condenser is used to preheat the phenol, thereby reducing external energy consumption and improving energy utilization.

[0009] The tert-butylphenol discharge treatment system further includes an isobutylene storage tank, which is connected to the reactor via an isobutylene preheating tank. The isobutylene storage tank is equipped with an isobutylene storage tank insulation sleeve on its outside, and the isobutylene preheating tank is equipped with an isobutylene preheating tank coil inside. The phenol storage tank is equipped with a phenol storage tank insulation sleeve on its outside, and the phenol preheating tank is equipped with a phenol preheating tank coil inside.

[0010] The reactor is connected to the crude product cooler coil via a pipe, and the crude product cooler coil is connected to the first-stage distillation column via a pipe. Cooling liquid is connected to the crude product cooler via an inlet pipe.

[0011] The bottom of the crude product cooler is connected to the insulation sleeve of the phenol storage tank via a pipe, and the bottom of the crude product cooler is connected to the insulation sleeve of the isobutylene storage tank via a pipe.

[0012] The primary distillation column is equipped with a product collection tank and a reboiler. The product collection tank is located above the reboiler, and the primary distillation column condenser is located above the product collection tank. The primary distillation column condenser is connected to the phenol preheating tank coil via a pipeline, and the primary distillation column condenser is connected to the isobutylene preheating tank coil via a pipeline.

[0013] The primary vacuum pipeline is connected to a primary distillation column trap and a primary vacuum pump. The primary distillation column trap is located between the primary vacuum pump and the primary distillation column condenser.

[0014] The secondary distillation column is connected to a secondary vacuum pump via a secondary vacuum pipeline. A secondary distillation column trap is installed between the secondary vacuum pump and the secondary distillation column. A secondary distillation column condenser is installed inside the secondary distillation column.

[0015] The primary vacuum pipeline and the secondary vacuum pipeline are connected by a connecting pipeline, and an interconnecting valve group is installed on the connecting pipeline. The connection point between the interconnecting valve group and the primary vacuum pipeline is located between the primary distillation column trap and the primary distillation column, and the connection point between the interconnecting valve group and the secondary vacuum pipeline is located between the secondary distillation column trap and the secondary distillation column.

[0016] The first-stage distillation column is equipped with a first-stage distillation column condenser and a reboiler. The top is connected to a first-stage vacuum pipeline, which is equipped with a first-stage distillation column trap and a first-stage vacuum pump. A product collection tank is installed on the column. Material separation is achieved through the condenser and reboiler. The vacuum system ensures distillation efficiency, the trap reduces impurities entering the vacuum pump, and the product collection tank collects distillation intermediate products.

[0017] The working principle of this utility model is as follows:

[0018] Phenol is stored in phenol storage tanks equipped with insulation jackets. The residual heat from the crude product cooler is used for insulation, maintaining the phenol temperature at 30-40℃ to ensure its good fluidity. Isobutylene is stored in isobutylene storage tanks equipped with insulation jackets. Similarly, the residual heat from the crude product cooler is used for insulation, controlling the temperature at 20-30℃. Phenol is piped to a phenol preheating tank, where it is preheated to 50-60℃ using the residual heat from the first-stage distillation column condenser within the preheating tank coils before being fed into the reactor. Isobutylene is piped to an isobutylene preheating tank, where it is preheated to 40-50℃ using the residual heat from the first-stage distillation column condenser within the preheating tank coils before being fed into the reactor.

[0019] Preheated phenol and isobutylene are introduced into a reactor in a specific ratio and reacted under the action of a catalyst. The reaction temperature is controlled at 100-120℃, the reaction pressure is maintained at 0.3-0.5MPa, and the reaction time is 2-3 hours. The crude product generated by the reaction is discharged from the reactor and enters a crude product cooler. Cooling liquid is introduced through the coil of the crude product cooler (the coolant enters through the coolant inlet pipe) to cool the crude product to 60-70℃. The waste heat generated by the crude product cooler is transferred through pipelines to the insulation jackets of the phenol and isobutylene storage tanks.

[0020] The cooled crude product is fed into a primary distillation column, which contains a primary condenser. A primary vacuum pipeline connects to the top of the column, and a primary vacuum pump maintains the vacuum level within the column at -0.08 to -0.09 MPa, with the reboiler temperature controlled at 120-140°C. During distillation, the light components at the top of the column are partially refluxed after condensation in the primary condenser, and partially collected as byproducts. The reboiler product is pumped into a secondary distillation column. The waste heat generated in the primary condenser is used to preheat the feedstock in the phenol and isobutylene preheating tanks via pipelines. The reboiler product from the primary distillation column enters the secondary distillation column, which contains a secondary condenser. A secondary vacuum pipeline and a secondary vacuum pump maintain the vacuum level within the column at -0.09 to -0.1 MPa, with the reboiler temperature controlled at 140-160°C. High-purity tert-butylphenol is obtained at the top of the column, which, after condensation, enters a product collection tank. The reboiler residue is periodically discharged for treatment. During normal production, the interconnecting valve group is closed, and the primary and secondary vacuum pipelines operate independently. If a blockage occurs in either the primary or secondary vacuum pipeline, affecting vacuum stability, the interconnecting valve group is opened to connect the two vacuum pipelines and close the blocked vacuum pipeline, ensuring vacuum stability in the distillation system.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] (1) By setting up a connecting pipe and an interconnecting valve group between the primary and secondary vacuum pipes, and connecting the primary distillation column trap and the primary distillation column, and the secondary distillation column trap and the secondary distillation column, when the primary or secondary vacuum pipes become blocked in low-temperature environments such as winter, the interconnecting valve group can be opened to connect the two vacuum pipes and close the blocked vacuum pipe, so that the vacuum of the distillation system remains stable. This ensures that the feed is not affected, maintains the continuity of the distillation process, and thus ensures the stability of product yield and quality. At the same time, it provides operators with sufficient time to deal with blocked vacuum pipes, reduces production downtime caused by equipment failure, and improves production efficiency.

[0023] (2) The bottom of the crude product cooler is connected to the insulation sleeves of the phenol storage tank and the isobutylene storage tank through pipes, respectively, so as to transfer the residual heat released during the cooling process of the crude product to the insulation sleeves of the raw material storage tank, and heat and insulate the phenol and isobutylene in the storage tank; effectively solving the problem of slow flow of raw materials due to low temperature in low temperature environment, ensuring the smoothness and stability of raw material discharge, and reducing energy consumption in the raw material transportation process.

[0024] (3) The condenser of the first-stage distillation column is connected to the coils of the phenol preheating tank and the isobutylene preheating tank via pipelines, respectively, so that the waste heat generated during the operation of the condenser can be used to preheat the raw materials phenol and isobutylene. By recovering and utilizing waste heat, the external energy consumption required for raw material preheating is reduced, the energy utilization rate is improved, energy waste in the production process is reduced, and the production cost is lowered. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the tert-butylphenol discharge treatment system of this utility model;

[0026] In the diagram: 1. Phenol storage tank; 2. Isobutylene storage tank; 3. Phenol preheating tank; 4. Isobutylene preheating tank; 5. Reactor; 6. Crude product cooler; 7. Primary distillation column; 8. Secondary distillation column; 9. Insulation jacket for phenol storage tank; 10. Insulation jacket for isobutylene storage tank; 11. Coil for phenol preheating tank; 12. Coil for isobutylene preheating tank; 13. Coil for crude product cooler; 14. Product collection tank; 15. Reboiler; 16. Primary vacuum pump; 17. Secondary vacuum pump; 18. Connecting pipe; 19. Interconnecting valve group; 20. Distillation pump; 21. Coolant inlet pipe; 22. Primary distillation column condenser; 23. Secondary distillation column condenser; 24. Primary distillation column trap; 25. Secondary distillation column trap; 26. Primary vacuum pipe; 27. Secondary vacuum pipe. Detailed Implementation

[0027] To make the objectives and technical solutions of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] like Figure 1As shown, the tert-butylphenol discharge processing system includes a phenol storage tank 1, which is connected to a reaction vessel 5 via a phenol preheating tank 3. The reaction vessel 5 is connected to a primary distillation column 7 via a crude product cooler 6. The primary distillation column 7 is connected to a secondary distillation column 8 via a distillation pump 20. The crude product cooler 6 is equipped with a crude product cooler coil 13, and the primary distillation column 7 is equipped with a primary distillation column condenser 22. The top of the primary distillation column 7 is connected to a primary vacuum pipeline 26. The crude product cooler 6 has a crude product cooler coil 13 inside, and its bottom is connected to the insulation sleeves 9 and 10 of the phenol and isobutylene storage tanks via pipes. A coolant inlet pipe 21 is provided, and the coolant is circulated through the coils to cool the crude product while simultaneously transferring waste heat to the insulation sleeves of the raw material storage tanks, thus achieving waste heat recovery and addressing the low-temperature fluidity issue of the raw materials. The isobutylene storage tank 2 is also included, connected to the reactor 5 via an isobutylene preheating tank 4. An isobutylene storage tank insulation sleeve 10 is located on the outside of the isobutylene storage tank 2. An isobutylene preheating tank coil 12 is located inside the isobutylene preheating tank 4. A phenol storage tank insulation sleeve 9 is located on the outside of the phenol storage tank 1, and a phenol preheating tank coil 11 is located inside the phenol preheating tank 3. The reactor 5 is connected to the crude product cooler coil 13 via pipes, and the crude product cooler coil 13 is connected to the first-stage distillation column 7 via pipes. A coolant inlet pipe 21 is connected to the crude product cooler 6. The bottom of the crude product cooler 6 is connected to the insulation sleeve 9 of the phenol storage tank via a pipe, and the bottom of the crude product cooler 6 is connected to the insulation sleeve 10 of the isobutylene storage tank via a pipe. The primary distillation column 7 is equipped with a product collection tank 14 and a reboiler 15. The product collection tank 14 is located above the reboiler 15. The primary distillation column condenser 22 is located above the product collection tank 14. The primary distillation column condenser 22 is connected to the coil 11 of the phenol preheating tank via a pipe, and the primary distillation column condenser 22 is connected to the coil 12 of the isobutylene preheating tank via a pipe. The primary vacuum pipeline 26 is connected to the primary distillation column trap 24 and the primary vacuum pump 16. The primary distillation column trap 24 is located between the primary vacuum pump 16 and the primary distillation column condenser 22. The secondary distillation column 8 is connected to the secondary vacuum pump 17 via a secondary vacuum pipeline 27. A secondary distillation column trap 25 is installed between the secondary vacuum pump 17 and the secondary distillation column 8. A secondary distillation column condenser 23 is installed inside the secondary distillation column 8. A connecting pipeline 18 connects the primary vacuum pipeline 26 and the secondary vacuum pipeline 27. An interconnecting valve assembly 19 is installed on the connecting pipeline 18. The connection point between the interconnecting valve assembly 19 and the primary vacuum pipeline 26 is located between the primary distillation column trap 24 and the primary distillation column 7. The connection point between the interconnecting valve assembly 19 and the secondary vacuum pipeline 27 is located between the secondary distillation column trap 25 and the secondary distillation column 8.

[0030] The above-mentioned tert-butylphenol discharge treatment system includes the following steps during operation:

[0031] (1) Phenol is stored in phenol storage tank 1, with an insulation sleeve 9 on the outside of the tank. The residual heat from the crude product cooler 6 is used for insulation to maintain the phenol temperature at 30-40℃, ensuring its good fluidity. Isobutylene is stored in isobutylene storage tank 2, with an insulation sleeve 10 on the outside of the tank. The residual heat from the crude product cooler 6 is also used for insulation, and the temperature is controlled at 20-30℃. Phenol is transported to phenol preheating tank 3 via pipeline. It is preheated in the coil 11 of the phenol preheating tank using the residual heat from the condenser 22 of the first-stage distillation column. After being preheated to 50-60℃, it is sent to reactor 5. Isobutylene is transported to isobutylene preheating tank 4 via pipeline. It is preheated in the coil 12 of the isobutylene preheating tank using the residual heat from the condenser 22 of the first-stage distillation column. After being sent to reactor 5, it is sent to reactor 5. (2) The preheated phenol and isobutylene are fed into the reactor 5 in a certain proportion and reacted under the action of the catalyst. The reaction temperature is controlled at 100-120℃, the reaction pressure is maintained at 0.3-0.5MPa, and the reaction time is 2-3 hours. The crude product generated by the reaction is discharged from the reactor 5 and enters the crude product cooler 6. Cooling liquid is introduced through the crude product cooler coil 13 to cool the crude product to 60-70℃. The residual heat generated by the crude product cooler 6 is transferred to the insulation jacket 9 of the phenol storage tank and the insulation jacket 10 of the isobutylene storage tank through the pipeline. (3) The cooled crude product is sent to the first-stage distillation column 7. The first-stage distillation column 7 is equipped with a first-stage distillation column condenser 22. The top of the column is connected to the first-stage vacuum pipeline 26. The vacuum degree inside the column is maintained by the first-stage vacuum pump 16. During the distillation process, the light components at the top of the column are partially refluxed after being condensed by the first-stage distillation column condenser 22, and part of them are collected as by-products. The product at the bottom of the column is sent to the second-stage distillation column 8 through the distillation pump 20. The waste heat generated by the condenser 22 of the primary distillation column is used through pipelines to preheat the raw materials in the phenol preheating tank 3 and the isobutylene preheating tank 4. The bottom product of the primary distillation column 7 enters the secondary distillation column 8, which is equipped with a secondary distillation column condenser 23. The vacuum level inside the column is maintained by the secondary vacuum pump 17 through the secondary vacuum pipeline 27. High-purity tert-butylphenol product is obtained at the top of the column, which, after condensation, enters the product collection tank 14. The bottom residue is periodically discharged for treatment. During normal production, the interconnecting valve group 19 is closed, and the primary vacuum pipeline 26 and the secondary vacuum pipeline 27 operate independently. When blockage of the primary or secondary vacuum pipeline affects vacuum stability, the interconnecting valve group 19 is opened to connect the two vacuum pipelines and close the blocked vacuum pipeline to ensure vacuum stability of the distillation system.

Claims

1. A tert-butylphenol discharge treatment system, characterized in that, It includes a phenol storage tank (1), which is connected to a reactor (5) via a phenol preheating tank (3). The reactor (5) is connected to a primary distillation column (7) via a crude product cooler (6). The primary distillation column (7) is connected to a secondary distillation column (8) via a distillation pump (20). The crude product cooler (6) is equipped with a crude product cooler coil (13). The primary distillation column (7) is equipped with a primary distillation column condenser (22). The top of the primary distillation column (7) is connected to a primary vacuum pipeline (26).

2. The tert-butylphenol discharge treatment system according to claim 1, characterized in that, It also includes an isobutylene storage tank (2), which is connected to the reactor (5) via an isobutylene preheating tank (4). An isobutylene storage tank insulation sleeve (10) is provided on the outside of the isobutylene storage tank (2), and an isobutylene preheating tank coil (12) is provided inside the isobutylene preheating tank (4). A phenol storage tank insulation sleeve (9) is provided on the outside of the phenol storage tank (1), and a phenol preheating tank coil (11) is provided inside the phenol preheating tank (3).

3. The tert-butylphenol discharge treatment system according to claim 1, characterized in that, The reactor (5) is connected to the crude product cooler coil (13) via a pipe. The crude product cooler coil (13) is connected to the first-stage distillation column (7) via a pipe. Cooling liquid is connected to the crude product cooler (6) via a pipe (21).

4. The tert-butylphenol discharge treatment system according to claim 2, characterized in that, The bottom of the crude product cooler (6) is connected to the insulation sleeve (9) of the phenol storage tank via a pipe, and the bottom of the crude product cooler (6) is connected to the insulation sleeve (10) of the isobutylene storage tank via a pipe.

5. The tert-butylphenol discharge treatment system according to claim 2, characterized in that, The first-stage distillation column (7) is equipped with a product collection tank (14) and a reboiler (15). The product collection tank (14) is located above the reboiler (15), and the first-stage distillation column condenser (22) is located above the product collection tank (14). The first-stage distillation column condenser (22) is connected to the phenol preheating tank coil (11) through a pipe, and the first-stage distillation column condenser (22) is connected to the isobutylene preheating tank coil (12) through a pipe.

6. The tert-butylphenol discharge treatment system according to claim 1, characterized in that, The primary vacuum pipeline (26) is connected to a primary distillation column trap (24) and a primary vacuum pump (16). The primary distillation column trap (24) is located between the primary vacuum pump (16) and the primary distillation column condenser (22).

7. The tert-butylphenol discharge treatment system according to claim 6, characterized in that, The secondary distillation column (8) is connected to the secondary vacuum pump (17) through the secondary vacuum pipeline (27). A secondary distillation column trap (25) is provided between the secondary vacuum pump (17) and the secondary distillation column (8). A secondary distillation column condenser (23) is provided inside the secondary distillation column (8).

8. The tert-butylphenol discharge treatment system according to claim 7, characterized in that, A connecting pipe (18) connects the primary vacuum pipe (26) and the secondary vacuum pipe (27). An interconnecting valve group (19) is provided on the connecting pipe (18). The connection point between the interconnecting valve group (19) and the primary vacuum pipe (26) is located between the primary distillation column trap (24) and the primary distillation column (7). The connection point between the interconnecting valve group (19) and the secondary vacuum pipe (27) is located between the secondary distillation column trap (25) and the secondary distillation column (8).

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