Device for increasing water value qualification speed of butadiene device product

Abstract

The utility model provides a device for increasing the product water value qualification speed of a butadiene device, which is characterized in that pipelines are arranged at the outlet of a heavy component removal tower reflux pump and a light component removal tower reflux tank, and the heavy component removal tower reflux pump is used for directly conveying water-containing industrial butadiene with an unqualified water value at the initial start-up stage into the light component removal tower reflux tank; water entrained in industrial butadiene is separated by utilizing the water diversion funnel of the reflux tank of the light component removal tower, so that the product qualification speed is greatly increased, the product qualification speed can be increased, the energy consumption and the material consumption can be reduced, the product can obtain profit in advance, the upstream and downstream load increasing speed can be increased, and better economic benefits can be obtained.

Description

Technical Field

[0001] This utility model belongs to the field of butadiene production technology, specifically relating to a device for accelerating the qualification of water content in industrial butadiene products during the initial startup phase of a butadiene plant. Background Technology

[0002] The butadiene unit uses the acetonitrile process to produce butadiene. When producing qualified industrial butadiene, dehydration measures must be taken to ensure that the water content in the industrial butadiene product is ≤20ppm to meet the product's quality requirements. In the initial stage of the production unit's start-up, it is very important to ensure that the product's water content meets the factory's requirements as soon as possible.

[0003] The purpose of the butadiene light component removal tower is to remove methylacetylene and water entrained in industrial butadiene products. These two components flow out as light components from the top of the tower, and the pressure at the top fluctuates with the methylacetylene content and the temperature of the cooling water. Because methylacetylene can cause a self-decomposition explosion under certain conditions, its concentration must be less than 45%. Therefore, some butadiene must be lost to maintain this limit. A reflux tank is installed at the top of the tower, and the reflux tank is equipped with a water separation funnel. The methylacetylene gas is discharged into a flare or methylacetylene gas recovery device at the top of the tank, and the water collected by the water separation funnel is discharged into the solvent recovery system.

[0004] The function of a butadiene deweighting column is to utilize the difference in relative volatility of materials within the column to separate industrial butadiene from heavy component impurities (cis-2-butene, 1,2-butadiene, ethyl acetylene, C5, C6, dimers, TBC, toluene, etc.) through general distillation. The heavy components are removed from the bottom of the column, while 1,3-butadiene and media with similar relative volatility are distilled off at the top of the column.

[0005] Based on the analysis of the functions of the light and heavy component removal towers, the reflux tank of the heavy component removal tower lacks dehydration capacity. In the initial stage of butadiene production, the butadiene moisture value is solely controlled by the separation funnel in the reflux tank of the light component removal tower. The dehydration principles of the light and heavy component removal towers are the same: water is discharged as a light component within a large amount of butadiene. Because the vapor recovery rate from the top of the heavy component removal tower is three times that of the light component removal tower, the heavy component removal tower has a stronger dehydration capacity. However, the reflux tank of the heavy component removal tower lacks a separation funnel, so currently, water is discharged through the separation funnel in the light component removal tower's reflux tank. The drainage capacity of the light component removal tower's reflux tank is limited, and the time required to control the moisture value to the acceptable level is relatively long, generally around 3-10 days, resulting in wasted energy and material resources. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] This invention proposes a device for improving the speed at which the water content of butadiene products meets the required standards, in order to solve the technical problem of how to ensure that the water content of industrial butadiene products meets the required standards as quickly as possible during the initial startup phase of a butadiene plant.

[0008] (II) Technical Solution

[0009] To solve the above-mentioned technical problems, this utility model proposes a device for improving the rate of product water value qualification in butadiene plants. The device connects a new pipeline between the outlet of the heavy removal tower reflux pump and the light removal tower reflux tank; a new first valve is installed at the connection between the new pipeline and the light removal tower reflux tank; and a new second valve is installed at the connection between the new pipeline and the outlet of the heavy removal tower reflux pump.

[0010] Furthermore, a new first drain valve and a new flare discharge line valve are installed before the first valve.

[0011] Furthermore, a second drain is installed after the second valve; nitrogen is introduced into the second drain, which serves as the nitrogen purging inlet, and the residual industrial butadiene is purged into the flare system using the newly added flare discharge line valve.

[0012] Furthermore, when the liquid level in the heavy removal tower reflux tank reaches 30%, the heavy removal tower reflux pump is started, and the first and second valves are opened to directly introduce the water-containing industrial butadiene product into the light removal tower reflux tank. The water is separated using the water separator funnel in the light removal tower reflux tank. During the initial start-up, the flow rate of water-containing industrial butadiene in the pipeline is increased, and the heating capacity of the light removal tower reboiler is increased. This allows the industrial butadiene with a higher water content in the heavy removal tower reflux tank to be separated from the water using the water separator funnel, thus accelerating the removal of water from the system.

[0013] (III) Beneficial Effects

[0014] This invention proposes a device for improving the speed of product water quality qualification in butadiene plants. By installing pipelines at the outlet of the heavy removal tower reflux pump and the light removal tower reflux tank, the heavy removal tower reflux pump directly transports the initially unqualified water-containing industrial butadiene to the light removal tower reflux tank. The water-separating funnel in the light removal tower reflux tank separates the water entrained in the industrial butadiene, thus significantly increasing the product qualification speed. This accelerates product qualification, reduces energy and material consumption, allows for earlier profit generation, and also increases upstream and downstream load, leading to better economic benefits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the device and its working principle for improving the rate of water content qualification of butadiene products.

[0016] In the diagram: 1-Lightweight toll removal tower, 2-Lightweight toll removal tower condenser, 3-Lightweight toll removal tower reflux tank, 4-Lightweight toll removal tower reflux tank water distribution funnel, 5-Lightweight toll removal tower reflux pump, 6-Lightweight toll removal tower reboiler, 7-Lightweight toll removal tower outlet pump, 8-Heavyweight toll removal tower reboiler, 9-Heavyweight toll removal tower, 10-Heavyweight toll removal tower condenser, 11-Heavyweight toll removal tower reflux tank, 12-Heavyweight toll removal tower reflux pump, 13-Heavyweight toll removal pump, 14-Heavyweight toll removal tower bottom liquid outlet line, 15-New first valve, 16-New first drain, 17-New flare discharge line valve 1, 18-New second drain, 19-New second valve, 20-New pipeline. Detailed Implementation

[0017] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0018] like Figure 1 As shown, in the light component removal tower 1 and the heavy component removal tower 9, due to the intermolecular forces in the mixture of butadiene and water, the relative volatility of water to butadiene is 6.53 (at 40℃). Water with a boiling point of 100℃ becomes the "light component," while butadiene with a boiling point of only -4.41℃ becomes the "heavy component." Water and butadiene are condensed by the light component removal tower condenser 2 and then enter the light component removal tower reflux tank 3. They are then sent to the heavy component removal tower 9 by the light component removal tower outlet pump 7. The heavy component removal tower 9 is equipped with a heavy component removal tower reboiler 8 as a heat source. The gaseous butadiene in the heavy component removal tower 9 is cooled by the heavy component removal tower condenser 10 and then enters the heavy component removal tower reflux tank 11. The butadiene in the tower bottom is sent to the butadiene storage tank by the heavy component removal tower outlet pump 13 and the heavy component removal tower outlet liquid outlet line 14. The storage tank stores qualified butadiene products. Based on the above principle, water in the light component removal tower 1 is removed as a light component in the water separation funnel 4 of the light component removal tower reflux tank. In the initial stage of operation, the water value is not up to standard, and the water-containing industrial butadiene product will enter the heavy component removal tower 9. The amount of gas phase at the top of the heavy component removal tower 9 is three times that of the light component removal tower 1, so the dehydration capacity of the heavy component removal tower 9 is stronger than that of the light component removal tower 1.

[0019] Based on the above analysis, this embodiment proposes a device for improving the rate of product moisture content qualification in a butadiene unit. A new pipeline 20 is connected between the outlet of the heavy-duty tower reflux pump 12 and the light-duty tower reflux tank 3. A new first valve 15 is installed at the connection between the new pipeline 20 and the light-duty tower reflux tank 3. A new second valve 19 is installed at the connection between the new pipeline 20 and the outlet of the heavy-duty tower reflux pump 12.

[0020] A new first drain valve 16 and a new flare discharge line valve 17 are installed before the first valve 15. A new second drain valve 18 is installed after the second valve 19. Nitrogen gas is introduced into the new second drain valve 18, which serves as the nitrogen purging inlet. Residual industrial butadiene is purged into the flare system using the new flare discharge line valve 17 to prevent polymerization of residual industrial butadiene within the pipeline. The new first drain valve 16 serves as a reserved interface.

[0021] When the liquid level in the heavy removal tower reflux tank 11 reaches 30%, start the heavy removal tower reflux pump 12, open the first valve 15 and the second valve 19, and directly introduce the water-containing industrial butadiene product into the light removal tower reflux tank 3. Use the water separation funnel 4 of the light removal tower reflux tank to separate the water. In the initial stage of start-up, increase the flow rate of water-containing industrial butadiene in this pipeline and increase the heating capacity of the light removal tower reboiler 6. This will allow the industrial butadiene with a higher water content in the heavy removal tower reflux tank 3 to be separated from the water using the water separation funnel 4, thus accelerating the removal of water from the system. This will effectively improve the drainage speed of the unit system in the initial stage of start-up, accelerate the qualification of industrial butadiene products, reduce energy and material consumption, promote the load increase of upstream and downstream units, and significantly improve economic benefits.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for accelerating the rate of achieving the required water content in butadiene products, characterized in that, The device connects a new pipeline between the outlet of the heavy removal tower reflux pump and the light removal tower reflux tank; a new first valve is installed at the connection between the new pipeline and the light removal tower reflux tank; and a new second valve is installed at the connection between the new pipeline and the outlet of the heavy removal tower reflux pump.

2. The apparatus for improving the rate of water content qualification of butadiene products as described in claim 1, characterized in that, Install a new first drain valve and a new flare discharge line valve before the first valve.

3. The apparatus for improving the rate of water content qualification of butadiene products as described in claim 2, characterized in that, A second drain line is installed after the second valve; nitrogen is introduced into the second drain line, and the second drain line is used as the nitrogen purging inlet. The residual industrial butadiene is purged into the flare system using the valve of the newly added flare discharge line.

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