Dixylene recovery device for vinyl acetylene production

Abstract

The utility model relates to the field of chemical engineering, in particular to a xylene recovery device for vinyl acetylene production. The xylene recovery device for vinyl acetylene production comprises an absorption tower, a polymerization kettle, a recovery tower, a condenser and a filtering device, the absorption tower is used for absorbing DVA, high polymers and main xylene components in reaction gas, the absorption tower is connected with the polymerization kettle through a pipeline, and the polymerization kettle is used for polymerizing DVA in the absorption tower and DVA in xylene. According to the xylene recovery device for vinyl acetylene production, the absorption tower and the recovery tower are effectively combined, xylene in the production process can be efficiently recovered, waste of raw materials is reduced, the utilization rate of resources is improved, the production cost is reduced, and the production efficiency is improved through the effect of the condenser and the recovery device. Xylene in the waste gas can be condensed into a liquid state to be recycled, so that pollution caused by direct emission of the waste gas into the environment is avoided, and negative effects on the environment are reduced.

Description

Technical Field

[0001] The utility model relates to the field of chemical engineering, in particular to a xylene recovery device for vinyl acetylene production. Background Art

[0002] With the rapid development of the chemical industry, vinyl acetylene (DVA), as an important chemical raw material, is widely used in the production of products such as chloroprene rubber. However, in the production process of DVA, a large amount of waste gas containing DVA, polymers and xylene is generated. If these waste gases are directly discharged without treatment, it will not only cause waste of resources, but also cause serious environmental pollution. Traditional recovery methods often can only recover part of the xylene, and the recovery efficiency is not high, resulting in a large amount of resources being wasted. Moreover, in the recovery process, organic compounds in the waste gas may be carried out together with water vapor, forming secondary pollution and having a serious impact on the environment.

[0003] Therefore, it is necessary to provide a new xylene recovery device for vinyl acetylene production to solve the above technical problems. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a xylene recovery device for vinyl acetylene production.

[0005] The xylene recovery device for vinyl acetylene production provided by the utility model includes:

[0006] An absorption tower, which is used to absorb DVA, polymers and the main xylene components in the reaction gas;

[0007] A polymerization kettle, the absorption tower is connected to the polymerization kettle through a pipeline, and the polymerization kettle is used to polymerize DVA in the absorption tower with DVA in xylene to convert it into a polymer;

[0008] A recovery tower, the polymerization kettle is connected to the recovery tower through a pipeline, and the recovery tower is used to carry out vacuum distillation on the xylene containing polymers to separate out xylene;

[0009] A condenser, the upper part of the recovery tower is connected to the condenser through a pipeline, and the condenser is used to cool the waste gas containing xylene;

[0010] A filtering device, the condenser is connected to the filtering device through a pipeline, and the filtering device is used to recover and filter the xylene waste liquid condensed into a liquid state.

[0011] Preferably, a temperature detector is installed at the top of the absorption tower.

[0012] Preferably, a pressure detector is installed on one side of the absorption tower.

[0013] Preferably, a pressure regulating valve is installed at the top of the absorption tower.

[0014] Preferably, the inside of the absorption tower is equidistantly provided with curved partition plates, and the curved partition plates are used to increase the gas-liquid contact area.

[0015] Preferably, the outside of the top end of the absorption tower is rotatably connected with C-shaped hoops at equal intervals, and the inside of the top ends of the C-shaped hoops are all threadedly connected with hand-tightening bolts.

[0016] Preferably, the top of the absorption tower is provided with a top cover, and an annular groove is opened on the top of the top cover. The C-shaped hoops are fixedly connected with the annular groove on the top of the top cover through hand-tightening bolts, and the bottom ends of the hand-tightening bolts are in extrusion contact with the inner wall of the annular groove.

[0017] Compared with the related technology, the xylene recovery device for vinylacetylene production provided by the present utility model has the following beneficial effects:

[0018] The present utility model provides a xylene recovery device for vinylacetylene production. Through the effective combination of the absorption tower and the recovery tower, xylene in the production process can be efficiently recovered, which not only reduces the waste of raw materials, but also improves the utilization rate of resources and reduces the production cost. Through the action of the condenser and the recovery device, the xylene in the waste gas can be condensed into liquid for recovery, avoiding the pollution caused by the direct discharge of the waste gas into the environment and reducing the negative impact on the environment. The device adopts a modular design, and each component is connected by pipelines, which is convenient for installation, disassembly and maintenance. At the same time, the top cover of the absorption tower is fixed by C-shaped hoops and hand-tightening bolts, which is convenient for opening and closing and provides convenience for maintenance and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the xylene recovery device for vinylacetylene production provided by the present utility model;

[0020] Figure 2 is Figure 1 a front view of the structure of the absorption tower shown;

[0021] Figure 3 is Figure 1 a rear view of the structure of the absorption tower shown;

[0022] Figure 4 is Figure 2 a schematic diagram of the internal structure of the absorption tower shown.

[0023] Reference numerals in the figures: 1, absorption tower; 2, polymerization kettle; 3, recovery tower; 4, condenser; 5, filtering device; 6, C-shaped hoop; 7, hand-tightening bolt; 8, top cover; 9, annular groove; 10, temperature detector; 11, pressure detector; 12, pressure regulating valve; 13, curved partition plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] The following describes in detail the specific implementation of the present utility model in conjunction with specific embodiments.

[0026] Please refer to Figures 1 to 4 , a xylene recovery device for vinylacetylene production, the xylene recovery device for vinylacetylene production includes:

[0027] Absorption tower 1, which is used to absorb DVA, polymers and the main xylene components in the reaction gas;

[0028] Polymerization kettle 2, the absorption tower 1 is connected to the polymerization kettle 2 through a pipeline, and the polymerization kettle 2 is used to polymerize the DVA in the absorption tower 1 with the DVA in the xylene to convert it into a polymer;

[0029] Recovery tower 3, the polymerization kettle 2 is connected to the recovery tower 3 through a pipeline, and the recovery tower 3 is used to carry out vacuum distillation on the xylene containing polymers to separate the xylene;

[0030] Condenser 4, the upper part of the recovery tower 3 is connected to the condenser 4 through a pipeline, and the condenser 4 is used to cool the waste gas containing xylene;

[0031] Filtering device 5, the condenser 4 is connected to the filtering device 5 through a pipeline, and the filtering device 5 is used to recover and filter the condensed liquid xylene waste liquid.

[0032] It should be noted that: during the production process of vinylacetylene, the reaction gas enters the absorption tower 1 through a pipeline. The packing layer in the absorption tower 1 can effectively absorb DVA vinylacetylene, polymers and the main xylene components in the reaction gas. When the DVA concentration in the absorption tower 1 reaches a certain level, the mixture containing DVA and xylene is transported to the polymerization kettle 2. The polymerization kettle 2 polymerizes the DVA in the DVA and xylene at appropriate temperature and pressure to convert it into a polymer. The polymerized mixture enters the recovery tower 3 through a pipeline. The recovery tower 3 uses the method of vacuum distillation to separate the xylene containing polymers. Under reduced pressure, the boiling point of xylene decreases, so it is separated from the mixture. Then, the waste gas containing xylene enters the condenser 4 and is cooled into liquid xylene waste liquid. The liquid xylene waste liquid enters the filtering device 5 through a pipeline. The filtering device 5 further processes the waste liquid, and through filtration and purification, pure xylene is obtained to realize the recovery and reuse of xylene.

[0033] Please refer to Figures 1 to 4, a temperature detector 10 is installed at the top of the absorption tower 1;

[0034] It should be noted that: the temperature detector 10 is used to monitor the temperature inside the tower in real time to ensure that the absorption process is carried out within an appropriate temperature range;

[0035] Please refer to Figures 1 to 4 , a pressure detector 11 is installed on one side of the absorption tower 1;

[0036] It should be noted that: the pressure detector 11 is used to monitor the pressure inside the tower to ensure the stability of the absorption process;

[0037] Please refer to Figures 1 to 4 , a pressure regulating valve 12 is installed at the top of the absorption tower 1;

[0038] It should be noted that: the pressure regulating valve 12 is used to adjust the internal pressure of the absorption tower 1;

[0039] Please refer to Figures 1 to 4 , curved partitions 13 are equidistantly arranged inside the absorption tower 1, and the curved partitions 13 are used to increase the gas-liquid contact area;

[0040] It should be noted that: by increasing the gas-liquid contact area, the absorption efficiency is improved;

[0041] Please refer to Figures 1 to 4 , C-shaped hoops 6 are rotatably connected equidistantly on the outer side of the top of the absorption tower 1, and hand-tightening bolts 7 are threadedly connected inside the tops of the C-shaped hoops 6;

[0042] It should be noted that: when the absorption tower 1 needs to be opened, the hand-tightening bolts 7 can be loosened to loosen the C-shaped hoops 6, so as to remove the top cover 8;

[0043] Please refer to Figures 1 to 4 , the absorption tower 1 is provided with a top cover 8 at the top, an annular groove 9 is opened at the top of the top cover 8, and the C-shaped hoop 6 is fixedly connected to the annular groove 9 at the top of the top cover 8 through the hand-tightening bolt 7, and the bottom ends of the hand-tightening bolts 7 are in extrusion contact with the inner wall of the annular groove 9;

[0044] It should be noted that: an annular groove 9 is opened at the top of the top cover 8, and the C-shaped hoop 6 is fixedly connected to the annular groove 9 at the top of the top cover 8 through the hand-tightening bolt 7 to ensure the sealing performance between the top cover 8 and the absorption tower 1.

[0045] The working principle of the xylene recovery device for vinyl acetylene production provided by the present utility model is as follows: During the production process of vinyl acetylene, the reaction gas enters the absorption tower 1 through a pipeline. The packing layer in the absorption tower 1 can effectively absorb DVA (vinyl acetylene), polymers, and the main xylene components in the reaction gas. A temperature detector 10 is installed at the top of the absorption tower 1 to monitor the temperature inside the tower in real time, ensuring that the absorption process is carried out within an appropriate temperature range. At the same time, a pressure detector 11 is installed on one side of the absorption tower 1 to monitor the pressure inside the tower, guaranteeing the stability of the absorption process;

[0046] When the DVA concentration in the absorption tower 1 reaches a certain level, the mixture containing DVA and xylene is transported to the polymerization kettle 2. In the polymerization kettle 2, under appropriate temperature and pressure, the DVA in DVA and xylene is polymerized into a polymer. The polymerized mixture enters the recovery tower 3 through a pipeline. The recovery tower 3 uses the method of vacuum distillation to separate the xylene containing polymers. Under reduced pressure, the boiling point of xylene decreases, so it is separated from the mixture;

[0047] A condenser 4 is connected above the recovery tower 3 through a pipeline. After the waste gas containing xylene enters the condenser 4, it is cooled into liquid xylene waste liquid. The liquid xylene waste liquid enters the filtration device 5 through a pipeline. The filtration device 5 further processes the waste liquid, and through filtration and purification, pure xylene is obtained to achieve the recovery and reuse of xylene.

[0048] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present utility model.

Claims

1. A xylene recovery device for vinyl acetylene production, characterized in that: include: An absorption tower (1), the absorption tower (1) is used to absorb DVA, polymers and main xylene components in the reaction gas; A polymerization kettle (2), the absorption tower (1) is connected to the polymerization kettle (2) through a pipeline, and the polymerization kettle (2) is used to polymerize the DVA in the absorption tower (1) with the DVA in the xylene to convert them into a polymer; A recovery tower (3), wherein the polymerization kettle (2) is connected to the recovery tower (3) via a pipeline, and the recovery tower (3) is used to perform reduced pressure distillation on xylene containing the polymer to separate the xylene; A condenser (4), the recovery tower (3) is connected to a condenser (4) via a pipeline, and the condenser (4) is used to cool the waste gas containing xylene; A filtering device (5), the condenser (4) is connected to the filtering device (5) via a pipeline, and the filtering device (5) is used to recover and filter the xylene waste liquid condensed into liquid.

2. The xylene recovery device for vinyl acetylene production according to claim 1, characterized in that: A temperature detector (10) is installed on the top of the absorption tower (1).

3. The xylene recovery device for vinyl acetylene production according to claim 1, characterized in that: A pressure detector (11) is installed on one side of the absorption tower (1).

4. The xylene recovery device for vinyl acetylene production according to claim 1, characterized in that: A pressure regulating valve (12) is installed on the top of the absorption tower (1).

5. The xylene recovery device for vinyl acetylene production according to claim 1, characterized in that: Curved partitions (13) are arranged at equal intervals inside the absorption tower (1), and the curved partitions (13) are used to increase the gas-liquid contact area.

6. The xylene recovery device for vinyl acetylene production according to claim 1, characterized in that: A C-shaped hoop (6) is equidistantly rotatably connected to the outer side of the top of the absorption tower (1), and a hand-tightened bolt (7) is threadedly connected to the inner side of the top of the C-shaped hoop (6).

7. The xylene recovery device for vinyl acetylene production according to claim 6, characterized in that: A top cover (8) is provided on the top of the absorption tower (1), and an annular groove (9) is provided on the top of the top cover (8). The C-shaped hoop (6) is fixedly connected to the annular groove (9) on the top of the top cover (8) by means of a hand-tightening bolt (7), and the bottom ends of the hand-tightening bolts (7) are in compression contact with the inner wall of the annular groove (9).

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