Hydrochloric acid water supplementing system of methyl allyl chloride device
By using a combination of a vacuum water condenser and a jet pump in the methyl allyl chloride unit, the temperature and pressure problems of the vacuum water tank during the water replenishment process of the hydrochloric acid circulation system were solved, achieving stable operation of the hydrochloric acid water replenishment system and ensuring continuous production and safety of the unit.
Patent Information
- Application Number
- CN202520199505.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-08
AI Technical Summary
In the existing methyl allyl chloride unit, hydrochloric acid tail gas is generated in the vacuum water tank when the hydrochloric acid circulation system is replenished, which leads to an increase in temperature and excessive pressure, affecting the stability of the vacuum system. In addition, the unit needs to be shut down when changing the water, causing production to stop and creating safety hazards.
A combination of a vacuum water condenser and a vacuum jet pump is used to send fresh water into the vacuum water tank for cooling through a vacuum circulation pipeline. The vacuum pump and the standby pump maintain a negative pressure state to prevent hydrochloric acid gas backflow and ensure the stability of the water replenishment process.
This ensured the stability of the hydrochloric acid replenishment process, prevented excessively high temperatures and pressures in the vacuum tank, guaranteed the smooth operation of the methyl allyl chloride unit, reduced the risk of shutdown and resource waste, and improved production continuity.
Smart Images
Figure CN223788293U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of hydrochloric acid replenishment systems for methyl allyl chloride devices, and particularly to a hydrochloric acid replenishment system for methyl allyl chloride devices. Background Technology
[0002] In the methyl allyl chloride unit, the chlorination reaction system produces hydrochloric acid gas, which is absorbed by the hydrochloric acid circulation system. This circulation system requires a large amount of fresh water for replenishment and dilution. Current technology uses a fresh water pipeline with a regulating valve to directly replenish the hydrochloric acid three-stage circulation tank. However, during replenishment, some hydrochloric acid tail gas also enters the vacuum water tank. When the hydrochloric acid concentration in the vacuum water tank reaches a certain level, more tail gas continues to be generated, causing the water temperature inside the vacuum water tank to rise and create pressure. This causes the vacuum tank to draw in some water, and excessive intake can lead to system failure. During routine water changes in the vacuum water tank, the vacuum system must be shut down, the water in the vacuum water tank drained, and then replenished. The distillation system may shut down due to vacuum issues, leading to increased costs and wasted resources during subsequent restarts due to unqualified initial products, and posing certain safety hazards. Utility Model Content
[0003] To solve the above-mentioned technical problems, this application provides a hydrochloric acid makeup water system for a methyl allyl chloride device. This utility model is achieved through the following technical solution:
[0004] A hydrochloric acid makeup water system for a methyl allyl chloride unit includes a three-stage hydrochloric acid circulation tank. The three-stage hydrochloric acid circulation tank is connected to a vacuum water tank via a fresh water makeup pipeline. A fresh water overflow control valve is installed on the fresh water makeup pipeline. A fresh water injection pipeline is connected to the top of the vacuum water tank. A vacuum water condenser is connected to the bottom of the vacuum water tank. The vacuum water condenser is connected to the top of the vacuum water tank via a vacuum circulation pipeline. A vacuum pump is installed on the vacuum circulation pipeline. The vacuum circulation pipeline is connected to a branch pipeline. A standby vacuum pump is installed on the branch pipeline. The standby vacuum pump is connected in parallel with the vacuum pump. A vacuum jet pump is installed on the vacuum pipeline near the vacuum water tank. The vacuum jet pump is connected to a vacuum tank. The vacuum tank is connected to a vacuum buffer tank.
[0005] As a preferred embodiment, a water valve is provided on the fresh water injection pipeline.
[0006] As a preferred embodiment, the vacuum water condenser is provided with a cooling medium inlet pipeline at the lower part and a cooling medium outlet pipeline at the upper part.
[0007] As a preferred embodiment, the top of the vacuum water tank is connected to an exhaust gas treatment device.
[0008] Compared with the prior art, the beneficial effects of this utility model are: This utility model can prevent hydrochloric acid gas in the three-stage hydrochloric acid circulation tank from flowing back into the vacuum water tank, causing the temperature and pressure of the vacuum water tank to be too high. While replenishing water, both the vacuum water condenser and the vacuum tank are working. The vacuum water condenser cools down the water in the vacuum water tank and then sends it into the vacuum water tank through the vacuum circulation pipeline via a vacuum pump. This can prevent the temperature of the fresh water in the vacuum water tank from being too high. The vacuum jet pump works to draw the vacuum water tank to a negative pressure. The vacuum water tank in a negative pressure state can ensure that the fresh water in the vacuum water tank continuously overflows into the three-stage hydrochloric acid circulation tank.
[0009] While ensuring that the replacement of fresh water and the amount of water replenishment in the vacuum water tank do not affect the vacuum, the vacuum water tank is cooled down to ensure the stable operation of the hydrochloric acid water replenishment system of the methyl allyl chloride unit. This enables the methyl allyl chloride distillation system to produce continuously and stably, and can effectively recover more hydrochloric acid tail gas. Attached Figure Description
[0010] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0011] Figure 1 This is a schematic diagram of the connection structure of this utility model. Detailed Implementation
[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:
[0013] A hydrochloric acid makeup water system for a methyl allyl chloride plant includes a three-stage hydrochloric acid circulation tank 1, which is connected via a fresh water makeup line 2. The fresh water makeup line 2 is equipped with a fresh water overflow control valve 21. A vacuum water tank 3 is connected to a fresh water injection line 4 at its top and a vacuum water condenser 5 at its bottom. The vacuum water condenser 5 is connected to the top of the vacuum water tank 3 via a vacuum circulation line 6, and a vacuum pump 7 is installed on the vacuum circulation line 6.
[0014] The vacuum circulation pipeline 6 is connected to a branch pipeline 8, and a standby vacuum pump 9 is installed on the branch pipeline 8. The standby vacuum pump 9 is connected in parallel with the vacuum pump 7. A vacuum jet pump 10 is installed on the vacuum circulation pipeline 6 near the vacuum water tank 3. The vacuum jet pump 10 is connected to a vacuum tank 11, and the vacuum tank 11 is connected to a vacuum buffer tank 12. The vacuum tank 11 operates to ensure the vacuum state of the vacuum jet pump 10. The vacuum buffer tank 12 can buffer the pressure inside the vacuum tank 11, prevent backflow, and ensure a stable vacuum level inside the vacuum tank 11.
[0015] Furthermore, a water valve 41 is provided on the fresh water injection pipeline 4.
[0016] Furthermore, the vacuum water condenser 5 is provided with a cooling medium inlet pipe 51 at its lower part and a cooling medium outlet pipe 52 at its upper part. The cooling medium continuously circulates between the cooling medium inlet pipe 51, the vacuum water condenser 5, and the cooling medium outlet pipe 52 to ensure the cooling effect within the vacuum water condenser 5.
[0017] Furthermore, the top of the vacuum water tank 3 is connected to the exhaust gas treatment device 31.
[0018] During operation, the hydrochloric acid replenishment system of the methyl allyl chloride unit replenishes the hydrochloric acid tertiary circulation tank 1 with fresh water through the vacuum water tank 3 to dilute the hydrochloric acid in the tertiary circulation tank 1. Fresh water is first added to the vacuum water tank 3 through the fresh water injection pipeline 4. Water in the vacuum water tank 3 overflows into the hydrochloric acid tertiary circulation tank 1. Because the vacuum water tank 3 and the hydrochloric acid tertiary circulation tank 1 are connected, to prevent hydrochloric acid gas in the tertiary circulation tank 1 from flowing back into the vacuum water tank 3, causing the vacuum water tank 3 to... When the temperature and pressure are too high, both the vacuum water condenser 5 and the vacuum tank 11 work while water is being replenished. The vacuum water condenser 5 cools down the water in the vacuum water tank 3 and then sends it into the vacuum water tank 3 through the vacuum circulation pipeline 6 via the vacuum pump 7. This can prevent the temperature of the fresh water in the vacuum water tank 3 from being too high. The vacuum jet pump 10 works to draw the vacuum water tank 3 to a negative pressure. The negative pressure state of the vacuum water tank 3 can ensure that the fresh water in the vacuum water tank 3 continuously overflows into the hydrochloric acid three-stage circulation tank 1.
[0019] The specific implementation of this utility model has been described in detail above, but it is only an example. This utility model is not limited to the specific implementation cases described above, and equivalent modifications to this utility model are also within the protection scope of this utility model.
Claims
1. A hydrochloric acid makeup water system for a methyl allyl chloride device, characterized in that, The system includes a hydrochloric acid three-stage circulation tank (1), which is connected to a vacuum water tank (3) via a fresh water supply line (2). The fresh water supply line (2) is equipped with a fresh water overflow control valve (21). The top of the vacuum water tank (3) is connected to a fresh water injection line (4). The bottom of the vacuum water tank (3) is connected to a vacuum water condenser (5). The vacuum water condenser (5) is connected to the top of the vacuum water tank (3) via a vacuum circulation line (6). The vacuum circulation line (6) is equipped with a vacuum pump (7). The vacuum circulation line (6) is connected to a branch line (8). The branch line (8) is equipped with a standby vacuum pump (9). The standby vacuum pump (9) is connected in parallel with the vacuum pump (7). The vacuum circulation line (6) is equipped with a vacuum jet pump (10) near the vacuum water tank (3). The vacuum jet pump (10) is connected to a vacuum tank (11). The vacuum tank (11) is connected to a vacuum buffer tank (12).
2. The hydrochloric acid makeup water system for the methyl allyl chloride device according to claim 1, characterized in that, A water valve (41) is provided on the fresh water injection pipeline (4).
3. The hydrochloric acid makeup water system for the methyl allyl chloride device according to claim 1, characterized in that, The vacuum water condenser (5) has a cooling medium inlet pipeline (51) at the bottom and a cooling medium outlet pipeline (52) at the top.
4. The hydrochloric acid makeup water system for the methyl allyl chloride unit according to claim 1, characterized in that, The top of the vacuum water tank (3) is connected to the exhaust gas treatment device (31).