A butadiene recovery system for styrene-butadiene latex production

Abstract

The utility model discloses a butadiene recovery system for butadiene styrene latex production belongs to tail gas recovery equipment field, including liquid ring compressor, oil water separator, first delivery pump, separation tank and second delivery pump, and the liquid ring compressor import is connected with tail gas input pipeline, and the liquid ring compressor export is in communication with the oil water separator import, be equipped with first liquid phase pipeline and first reflux pipeline on the oil water separator, and first delivery pump both ends are in communication with first liquid phase pipeline export and separation tank import respectively, be equipped with second liquid phase pipeline on the separation tank, and second liquid phase pipeline export is in communication with second delivery pump input end, still include condensation circulating assembly, and condensation circulating assembly is used to receive and cool the part butadiene liquid that exports from reflux pipeline, then sends back to liquid ring compressor and circulates as working liquid. The utility model can reduce the overall land occupation of system, greatly shorten the recovery time of butadiene, reduce operation and maintenance cost, and guarantee the production benefit of enterprise.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas recovery equipment, specifically relating to a butadiene recovery system for styrene-butadiene latex production. Background Technology

[0002] Styrene-butadiene rubber (SBR) latex is a synthetic rubber latex produced through emulsion polymerization using butadiene and styrene as the main monomers. It possesses excellent physical properties, chemical stability, and adhesive properties, and is widely used in papermaking, carpets, architectural coatings, and rubber products. However, the production process of SBR latex generates significant amounts of waste gas due to incomplete polymerization and the release of volatile substances during degassing and drying processes. If this waste gas is released directly into the atmosphere without treatment, it will cause serious environmental pollution. Therefore, proper recovery and treatment of waste gas are essential during the production of SBR latex.

[0003] Currently, various methods can be used to recover waste gas from the production process of styrene-butadiene latex, such as condensation recovery and adsorption treatment. Condensation recovery involves lowering the temperature to condense some of the waste gas into a liquid for recovery, but this method has limited efficiency in recovering low-boiling-point butadiene. Adsorption treatment uses adsorbents such as activated carbon to adsorb the waste gas. Its advantage is that it ensures subsequent regeneration, but its disadvantage is that it is easily saturated, requiring frequent replacement or regeneration of the adsorbent. Furthermore, the waste gas includes not only butadiene but also styrene monomer and water, so the recovery effects of the above two methods are not ideal.

[0004] To optimize butadiene recovery efficiency, a novel butadiene recovery system has been designed, employing a process of water washing, primary condensation, evaporation separation, secondary condensation, and recovery to recover butadiene tail gas. However, this system has a complex overall structure, requires a large footprint, and involves intensive operation. The recovery process is cumbersome, requiring not only water washing but also evaporation separation after primary condensation, followed by secondary condensation, resulting in a long recovery cycle. Furthermore, the system uses a large number of devices, leading to high maintenance costs in actual production and significantly reducing the company's production efficiency. Therefore, there is an urgent need for a butadiene recovery system that can solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing a butadiene recovery system for styrene-butadiene latex production, aiming to solve the problems of cumbersome recovery processes, long recovery cycles, and high operation and maintenance costs in current butadiene recovery systems. To achieve the above objective, this invention provides the following technical solution:

[0006] A butadiene recovery system for styrene-butadiene latex production includes a liquid ring compressor, an oil-water separator, a first transfer pump, a separation tank, and a second transfer pump. The liquid ring compressor inlet is connected to a tail gas input pipeline, and the liquid ring compressor outlet is connected to the oil-water separator inlet. The oil-water separator is equipped with a first liquid phase pipeline and a first reflux pipeline for outputting the separated butadiene liquid. The first transfer pump is connected at both ends to the outlet of the first liquid phase pipeline and the inlet of the separation tank, respectively. The separation tank is equipped with a second liquid phase pipeline for continuing to output butadiene liquid, and the outlet of the second liquid phase pipeline is connected to the input end of the second transfer pump. The system also includes a condensation circulation assembly. The condensation circulation assembly receives and cools a portion of the butadiene liquid output from the reflux pipeline, and then returns it to the liquid ring compressor for reuse as a working fluid.

[0007] Furthermore, the condensation cycle assembly includes a condenser and a second reflux line. The condenser inlet is connected to the outlet of the first reflux line, and the condenser outlet is connected to the bottom of the liquid ring compressor through the second reflux line.

[0008] Furthermore, the oil-water separator is provided with a first exhaust pipe at the top for conveying the gas separated at the top of the oil-water separator to the outside; the separation tank is provided with a second exhaust pipe at the top for conveying the gas accumulated at the top of the separation tank to the outside.

[0009] Furthermore, the end of the first exhaust pipe is connected to the interior of the second exhaust pipe.

[0010] Furthermore, the bottom of the separator is provided with a downwardly protruding water collection section; a first drain pipe is provided at the bottom of the water collection section. The first drain pipe is used to discharge the wastewater collected at the bottom of the water collection section to the outside.

[0011] Furthermore, the oil-water separator is also provided with a second drain pipe at the bottom; the end of the second drain pipe is connected to the interior of the first drain pipe. The second drain pipe is used to discharge the wastewater separated at the bottom of the oil-water separator.

[0012] Furthermore, it also includes an auxiliary material input pipeline; the auxiliary material input pipeline is arranged perpendicularly to the exhaust gas input pipeline, and the outlet of the auxiliary material input pipeline is connected to the interior of the exhaust gas input pipeline.

[0013] Furthermore, it also includes a first input pipe; the outlet of the liquid ring compressor and the inlet of the oil-water separator are connected through the first input pipe.

[0014] Furthermore, it also includes a second input pipe; the outlet end of the first delivery pump is connected to the inlet of the separation tank through the second input pipe; the inlet of the separation tank is located at the top of the separation tank.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model simplifies the butadiene recycling process, reduces the types and number of equipment used, makes the overall system structure compact and occupies a small area, can significantly shorten the butadiene recycling time, reduce operation and maintenance costs, and thus ensure the production efficiency of enterprises.

[0017] 2. This utility model is equipped with a condensation circulation component, which uses the butadiene solution separated by the oil-water separator as a circulating working fluid. On the one hand, by replacing the commonly used working fluid of the liquid ring compressor, i.e., the aqueous solution, the amount of water carried into the recovery system can be reduced, thereby reducing the amount of wastewater discharged from the subsequent system and reducing the wastewater treatment pressure. Through recycling, it can achieve the effect of energy saving and consumption reduction. On the other hand, the cooled butadiene solution can also cool down the liquid ring compressor, reducing the phenomenon of butadiene self-polymerization due to temperature rise during the compression process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] In the attached diagram: 1. Liquid ring compressor; 2. Oil-water separator; 3. Condenser; 4. First transfer pump; 5. Separation tank; 6. Second transfer pump; 51. Water collection section; 101. Tail gas inlet pipeline; 102. First inlet pipe; 103. First liquid phase pipeline; 104. Second inlet pipe; 105. Second liquid phase pipeline; 106. First exhaust pipeline; 107. Second exhaust pipeline; 108. First drain pipeline; 109. Second drain pipeline; 110. First return pipeline; 111. Second return pipeline; 112. Auxiliary material inlet pipeline. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0022] In the description of this utility model, "multiple" means two or more.

[0023] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0024] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0027] Example 1:

[0028] See attached Figure 1A butadiene recovery system for styrene-butadiene latex production includes a liquid ring compressor 1, an oil-water separator 2, a first transfer pump 4, a separation tank 5, and a second transfer pump 6. The inlet of the liquid ring compressor 1 is connected to a tail gas input pipeline 101, and the outlet of the liquid ring compressor 1 is connected to the inlet of the oil-water separator 2. The oil-water separator 2 is equipped with a first liquid phase pipeline 103 and a first return pipeline 110 for outputting the separated butadiene liquid. The first transfer pump 4 is connected at both ends to the outlet of the first liquid phase pipeline 103 and the inlet of the separation tank 5, respectively. The separation tank 5 is equipped with a second liquid phase pipeline 105 for continuing to output butadiene liquid, and the outlet of the second liquid phase pipeline 105 is connected to the input end of the second transfer pump 6. The system also includes a condensation circulation assembly. The condensation circulation assembly receives and cools a portion of the butadiene liquid output from the return pipeline, and then returns it to the liquid ring compressor 1 for reuse as a working fluid. As can be seen from the above structure, the exhaust gas inlet pipeline 101 is used to receive the exhaust gas generated during the production of styrene-butadiene latex and input it into the liquid ring compressor 1 through the inlet. The liquid ring compressor 1 is used to directly compress the exhaust gas to form a gas-liquid mixture containing butadiene liquid. Then, the compressed gas and liquid are transported together to the oil-water separator 2. The liquid ring compressor 1 has a simple and compact structure, which can reduce the overall system footprint. Moreover, the liquid ring compressor 1 does not require pretreatment such as gas-liquid separation or drying when treating exhaust gas, nor does it require multi-stage compression, reducing the investment in pretreatment equipment such as adsorption tanks. This reduces the types and number of equipment used and shortens the butadiene recovery cycle. The oil-water separator 2 is used to separate the gas, butadiene liquid, and wastewater in the gas-liquid mixture simultaneously. Among them, the first liquid phase pipeline 103 is used to continue to transport a portion of the butadiene liquid separated in the first stage. The butadiene liquid is pressurized by the first transfer pump 4 and transported to the separation tank 5 for temporary storage for secondary separation. Some of the gas separated from the oil-water separator 2 is carried into and accumulates at the top of the separator 5, while the butadiene liquid is located at the bottom inside the separator 5. Due to the different densities of wastewater and butadiene liquid, the butadiene liquid in the separator 5 can undergo secondary separation with the wastewater. Then, the separated butadiene liquid is pressurized and pumped out through the second liquid phase pipeline 105 by the second transfer pump 6. Subsequently, the butadiene liquid can be sent to an external recycling tank for storage, or it can be purified again as a raw material for latex polymerization, thereby realizing the recycling of materials and improving the utilization rate of raw materials.The first return line 110 is used to send another portion of the butadiene liquid separated in the first stage to the condensation circulation component for cooling. The cooled butadiene liquid is then returned to the liquid ring compressor 1 as a working fluid for recycling. This replaces the conventional working fluid (water solution) of the liquid ring compressor 1, reducing the wastewater content in the gas-liquid mixture input to the oil-water separator 2, thereby reducing subsequent wastewater discharge and achieving energy conservation and emission reduction. Furthermore, the cooled butadiene liquid can be used to cool the liquid ring compressor 1, ensuring a lower temperature for the gas-liquid mixture exiting the compressor and reducing the risk of butadiene self-polymerization due to high temperatures. This utility model's recycling system has a compact overall structure, small footprint, energy conservation and emission reduction, and significantly reduced operating costs due to the fewer devices used in the recycling process, ensuring the company's production efficiency. Moreover, the shorter recycling process significantly reduces the butadiene recycling time.

[0029] Example 2:

[0030] See attached Figure 1 Based on Embodiment 1, the condensation circulation assembly includes a condenser 3 and a second reflux line 111. The inlet of the condenser 3 is connected to the outlet of the first reflux line 110, and the outlet of the condenser 3 is connected to the bottom of the liquid ring compressor 1 through the second reflux line 111. As can be seen from the above structure, the butadiene solution output through the first reflux line 110 is cooled by the condenser 3 and then flows back to the liquid ring compressor 1 through the second reflux line 111, entering from the bottom of the liquid ring compressor 1. This portion of the refluxed butadiene solution serves as the working fluid, firstly maintaining the normal operation of the liquid ring compressor 1, secondly cooling the liquid ring compressor 1, and thirdly reducing the amount of external aqueous solution carried in, thereby reducing subsequent wastewater discharge. This design is not only ingenious and reduces external pollution but also has excellent energy-saving and consumption-reducing effects.

[0031] The oil-water separator 2 is equipped with a first exhaust pipe 106 at its top, used to transport the gas separated from the top of the oil-water separator 2 to the outside; the separation tank 5 is equipped with a second exhaust pipe 107 at its top, used to transport the gas accumulated at the top of the separation tank 5 to the outside. As can be seen from the above structure, after the oil-water separator 2 separates the gas, butadiene liquid, and wastewater in the gas-liquid mixture, the gas accumulates at the top of the oil-water separator 2 and is output to the outside through the first exhaust pipe 106. A small portion of the gas is carried into the separation tank 5 by the first liquid phase pipe 103 when the first transfer pump 4 transports the butadiene liquid. Therefore, the separation tank 5 is also equipped with a second exhaust pipe 107 at its top, which can transport the gas accumulated at the top of the separation tank 5 to the outside, further separating the gas and ensuring the separation effect.

[0032] The end of the first exhaust pipe 106 is internally connected to the second exhaust pipe 107. As can be seen from the above structure, the connection between the end of the first exhaust pipe 106 and the internal connection of the second exhaust pipe 107 is used to gather the separated gases together and discharge them to the outside. Specifically, the end of the second exhaust pipe 107 can be connected to an incineration device to partially incinerate the gases, thereby reducing environmental pollution.

[0033] The separator 5 has a downwardly protruding water collection section 51 at its bottom; the bottom of the water collection section 51 is equipped with a first drain pipe 108. As can be seen from the above structure, the first drain pipe 108 is used to discharge the wastewater separated by the separator 5. In the separator 5, the non-condensable gas phase gathers at the top of the separator 5, while the liquid phase mixture, due to its density difference, allows the butadiene liquid and wastewater in the tank to separate. Since butadiene has a lower density than water, it is located above the water in the separator 5, and the wastewater gathers at the bottom of the separator 5. Therefore, the downwardly protruding water collection section 51 at the bottom of the separator 5 facilitates the collection and discharge of wastewater. Specifically, the bottom of the water collection section 51 can be designed as a downwardly protruding arc shape. The bottom of the water collection section 51 is equipped with a first drain pipe 108 for discharging the wastewater outward from the bottom of the water collection section 51.

[0034] The oil-water separator 2 is also equipped with a second drain pipe 109 at its bottom; the end of the second drain pipe 109 is connected to the interior of the first drain pipe 108. As can be seen from the above structure, the second drain pipe 109 is used to discharge the wastewater separated by the oil-water separator 2. The oil-water separator 2 separates a gas-liquid mixture containing butadiene. The separated water collects at the bottom of the oil-water separator 2 and is discharged through the second drain pipe 109 at the bottom of the oil-water separator 2. The end of the second drain pipe 109 is connected to the interior of the first drain pipe 108, allowing the wastewater separated by the oil-water separator 2 and the separation tank 5 to collect in the second drain pipe 109 and be discharged together. The discharged wastewater can then be further treated in a wastewater treatment device.

[0035] Example 3:

[0036] See attached Figure 1Based on Embodiment 2, an auxiliary material input pipeline 112 is also included. The auxiliary material input pipeline 112 is perpendicularly arranged to the exhaust gas input pipeline 101, and its outlet is connected to the interior of the exhaust gas input pipeline 101. As can be seen from the above structure, one end of the auxiliary material input pipeline 112 is connected to the outside, and the other end is vertically connected to the exhaust gas input pipeline 101. It is used to input a polymerization inhibitor into the exhaust gas containing butadiene through the exhaust gas input pipeline 101 to prevent the butadiene in the exhaust gas from undergoing self-polymerization. Specifically, the exhaust gas input pipeline 101 can be arranged horizontally, and the auxiliary material input pipeline 112 can be arranged vertically, with one end vertically connected to the exhaust gas input pipeline 101. Preferably, an electronic valve can be added to the auxiliary material input pipeline 112 to control the amount of polymerization inhibitor added in real time.

[0037] It also includes a first input pipe 102; the outlet of the liquid ring compressor 1 and the inlet of the oil-water separator 2 are connected through the first input pipe 102. As can be seen from the above structure, the butadiene gas-liquid mixture formed by pressurization by the liquid ring compressor 1 will be sent to the oil-water separator 2 for separation through the first input pipe 102. Specifically, the outlet of the liquid ring compressor 1 can be located on one side wall of the liquid ring compressor 1, and the inlet of the oil-water separator 2 is located on the side wall of the oil-water separator 2 near the liquid ring compressor 1.

[0038] It also includes a second input pipe 104; the outlet end of the first transfer pump 4 is connected to the inlet of the separator 5 through the second input pipe 104; the inlet of the separator 5 is located at the top of the separator 5. As can be seen from the above structure, the inlet of the separator 5 can be specifically located on one side of the top of the separator 5, and the second exhaust pipe 107 is located on the other side of the top of the separator 5, with the two not interfering with each other. The fluid output from the liquid ring compressor 1 is pressurized by the first transfer pump 4 and continues to flow through the second input pipe 104, then enters the interior of the separator 5 for secondary separation of gas, butadiene, and wastewater.

[0039] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A butadiene recovery system for styrene-butadiene latex production, characterized in that: The system includes a liquid ring compressor (1), an oil-water separator (2), a first transfer pump (4), a separation tank (5), and a second transfer pump (6). The inlet of the liquid ring compressor (1) is connected to a tail gas input pipeline (101), and the outlet of the liquid ring compressor (1) is connected to the inlet of the oil-water separator (2). The oil-water separator (2) is provided with a first liquid phase pipeline (103) and a first return pipeline (110) for outputting the separated butadiene liquid to the outside. The two ends of the first transfer pump (4) are connected to the outlet of the first liquid phase pipeline (103) and the inlet of the separation tank (5), respectively. The separation tank (5) is provided with a second liquid phase pipeline (105) for continuing to output butadiene liquid to the outside, and the outlet of the second liquid phase pipeline (105) is connected to the input end of the second transfer pump (6). The system also includes a condensation circulation assembly. The condensation circulation assembly is used to receive and cool part of the butadiene liquid output from the return pipeline, and then send it back to the liquid ring compressor (1) for use as a working fluid.

2. The butadiene recovery system according to claim 1, characterized in that: The condensation cycle assembly includes a condenser (3) and a second return line (111). The inlet of the condenser (3) is connected to the outlet of the first return line (110), and the outlet of the condenser (3) is connected to the bottom of the liquid ring compressor (1) through the second return line (111).

3. The butadiene recovery system according to claim 1, characterized in that: The oil-water separator (2) is provided with a first exhaust pipe (106) at the top, which is used to transport the gas separated at the top of the oil-water separator (2) to the outside; the separation tank (5) is provided with a second exhaust pipe (107) at the top, which is used to transport the gas accumulated at the top of the separation tank (5) to the outside.

4. The butadiene recovery system according to claim 3, characterized in that: The end of the first exhaust pipe (106) is connected to the interior of the second exhaust pipe (107).

5. The butadiene recovery system according to claim 1, characterized in that: The bottom of the separator (5) is provided with a downward protruding water collection part (51); the bottom of the water collection part (51) is provided with a first drain pipe (108).

6. The butadiene recovery system according to claim 5, characterized in that: The oil-water separator (2) is also provided with a second drain line (109) at the bottom; the end of the second drain line (109) is connected to the inside of the first drain line (108).

7. The butadiene recovery system according to claim 1, characterized in that: It also includes an auxiliary material input pipeline (112); the auxiliary material input pipeline (112) is arranged perpendicularly to the exhaust gas input pipeline (101), and the outlet of the auxiliary material input pipeline (112) is connected to the interior of the exhaust gas input pipeline (101).

8. The butadiene recovery system according to claim 1, characterized in that: It also includes a first input pipe (102); the outlet of the liquid ring compressor (1) and the inlet of the oil-water separator (2) are connected through the first input pipe (102).

9. The butadiene recovery system according to claim 1, characterized in that: It also includes a second input pipe (104); the outlet end of the first delivery pump (4) is connected to the inlet of the separation tank (5) through the second input pipe (104); the inlet of the separation tank (5) is located at the top of the separation tank (5).

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