Pasteurization two-section filler rectifying tower for rectifying 1, 2-butadiene

Abstract

The utility model provides a pasteurization two-section packing rectifying tower for rectifying 1, 2-butadiene, and relates to the field of petrochemical industry. The rectifying tower comprises a tower body, a tower kettle reboiler and a tower top condenser, wherein the tower kettle reboiler and the tower top condenser are arranged outside the tower body; a feeding hole is formed in the middle of the tower body, a liquid outlet is formed in the bottom of the tower body, a tower kettle reflux inlet is formed in the lower part of the tower body, a product outlet is formed in the top of the tower body, and a pasteurization section and two rectification filler sections are arranged in the tower body from top to bottom; the pasteurization section comprises a pasteurization filler layer, a first through type spiral plate heat exchanger and a second through type spiral plate heat exchanger. The device disclosed by the utility model is used for a de-heavy rectification procedure in a process of purifying a 1, 2-butadiene product in a continuous rectification mode of de-light first and de-heavy second, continuous de-heavy rectification is carried out through the arranged two rectification filler sections, and then pasteurization treatment is carried out through the arranged pasteurization section, so that the 1, 2-butadiene product with high purity and high product yield is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a pasteurized two-stage filling distillation tower for 1,2-butadiene distillation. Background Art

[0002] In actual production, some companies have successfully realized the reuse of heavy components from the butadiene extraction unit of ethylene plants. By using the heavy components from the butadiene extraction unit of ethylene plants as raw materials to extract 1,2-butadiene, the added value of ethylene plants can be increased, the waste of raw materials can be significantly reduced, and the overall utilization rate of resources can be improved.

[0003] The heavy components in the butadiene extraction unit of the ethylene plant include various C4 hydrocarbons (such as isobutane, butane, butene, 2-butene, etc.), high-boiling-point acetylenes, and other by-products or impurities produced during the extraction process. Various impurities need to be separated and removed to obtain high-purity 1,2-butadiene.

[0004] Chinese patent CN 101337858 B provides a process technology and equipment for preparing 1,2-butadiene by a continuous method, which purifies 1,2-butadiene by a continuous distillation method of first removing the heavy and then the light. The distillation tower used is a conventional packed tower, and the purity and recovery rate of the obtained 1,2-butadiene product need to be improved.

[0005] The inventors have found that the continuous distillation method of first removing light components and then removing heavy components and then pasteurizing to purify 1,2-butadiene products can not only reduce the agglomeration of materials, but also improve the recovery rate of 1,3-butadiene and reduce the overall material consumption. Very few heavy components are finally discharged, especially pasteurization treatment has a more obvious effect on the purity and yield of 1,2-butadiene products. Utility Model Content

[0006] The utility model aims to provide a pasteurized two-stage filling distillation tower for 1,2-butadiene distillation, which is used for the de-heavy distillation process in the process of purifying 1,2-butadiene products by continuous distillation in which light is first removed and heavy is removed afterwards, and solves the problem that the purification effect of the de-heavy distillation tower in the process of purifying 1,2-butadiene by the existing continuous distillation method needs to be improved.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] The utility model provides a pasteurized two-stage packing distillation tower for 1,2-butadiene distillation, comprising a tower body, a tower kettle reboiler, and a tower top condenser, wherein the tower kettle reboiler and the tower top condenser are both arranged outside the tower body;

[0009] The middle part of the tower body is provided with a feed inlet, the bottom part is provided with a liquid outlet, the lower part is provided with a tower kettle reflux port, the liquid outlet port is connected with the tower kettle reboiler and the tower kettle reflux port in sequence through pipelines, the top of the tower body is provided with a product outlet, the product outlet is connected with the hot side inlet of the tower top condenser, the hot side outlet of the tower top condenser discharges 1,2-butadiene liquid product, the hot side medium inlet of the tower kettle reboiler is connected with the condensate water supply pipeline outside the boundary, the hot side medium outlet of the tower kettle reboiler is connected with the condensate water return pipeline outside the boundary, the cold side medium inlet of the tower top condenser is connected with the circulating cooling water supply pipeline outside the boundary, the cold side medium outlet of the tower top condenser is connected with the circulating cooling water return pipeline outside the boundary, and a pasteurization section and two distillation packing sections are provided from top to bottom in the tower body;

[0010] The pasteurization section includes a pasteurization packing layer and a first through-type spiral plate heat exchanger, wherein the pasteurization packing layer is arranged on the top of the first through-type spiral plate heat exchanger;

[0011] The first through-type spiral plate heat exchanger includes a first closed spiral hot side flow channel and a first axial through cold side flow channel. The inlet of the first closed spiral hot side flow channel is connected to the condensate water supply pipeline through a first heating branch pipe, and the outlet of the first closed spiral hot side flow channel is connected to the hot side medium inlet of the tower kettle reboiler through a first return water branch pipe.

[0012] Furthermore, the condensate water supply pipeline is provided with a first diverting three-way valve and a first collecting three-way valve, the inlet and one of the outlets of the first diverting three-way valve are connected to the condensate water supply pipeline, the other outlet of the first diverting three-way valve is connected to the inlet of the first heating branch pipe, the inlet and one of the outlets of the first collecting three-way valve are connected to the condensate water supply pipeline, and the other outlet of the first collecting three-way valve is connected to the outlet of the first return water branch pipe.

[0013] Furthermore, a second through-type spiral plate heat exchanger is also arranged on the top of the pasteurization packing layer, and the second through-type spiral plate heat exchanger includes a second closed spiral hot side flow channel and a second axial through cold side flow channel. The inlet of the second closed spiral hot side flow channel is connected to the first heating branch pipe through a second heating branch pipe, and the outlet of the second closed spiral hot side flow channel is connected to the first return water branch pipe through a second return water branch pipe. A high-temperature air source heat pump is provided on the second heating branch pipe.

[0014] Furthermore, a second diverting three-way valve is provided on the first heating branch pipe, and a second collecting three-way valve is provided on the first return water branch pipe. The inlet and one of the outlets of the second diverting three-way valve are connected to the first heating branch pipe, and the other outlet is connected to the inlet of the second heating branch pipe. The inlet and one of the outlets of the second collecting three-way valve are connected to the first return water branch pipe, and the other outlet of the second collecting three-way valve is connected to the outlet of the second return water branch pipe.

[0015] Furthermore, the width of the first closed spiral hot side flow channel is smaller than the width of the first axially through cold side flow channel, and the width of the second closed spiral hot side flow channel is smaller than the width of the second axially through cold side flow channel.

[0016] Preferably, the pasteurized packing layer has a height of 1.2 meters, which is equivalent to four theoretical plates. The pasteurized packing layer adopts regular plate corrugated packing, with a packing wire diameter of not less than 0.6 mm, a minimum pore size of 0.6 mm, and an average pore size of ≥0.75 mm.

[0017] Furthermore, the distillation packing section includes a distillation packing support plate and a distillation packing layer. The distillation packing layer is arranged on the distillation packing support plate. The distillation packing support plate adopts a corrugated plate structure. The distillation packing support plate is evenly provided with air holes. The distillation packing layer adopts a high-efficiency wire mesh packing.

[0018] Preferably, the packing of the distillation packing layer is 3 meters high, the number of theoretical plates per meter of packing is ≥ four, the packing wire diameter is not less than 0.6 mm, the minimum pore diameter is 0.5 mm, and the average pore diameter is ≥ 0.7 mm.

[0019] Preferably, the wave height on the distillation packing support plate is 100 mm, the diameter of the air distribution holes is 3 mm, and the air distribution holes are arranged in a regular triangle shape, with an opening rate between 35% and 42%.

[0020] Furthermore, a tower bottom circulation pump is arranged on the pipeline between the liquid outlet and the tower bottom reboiler.

[0021] Furthermore, a stabilizer injection port is provided at the lower portion of the tower body, and a nitrogen injection port is provided at the upper portion thereof.

[0022] Furthermore, a top reflux port is provided at the upper part of the tower body, and the hot side outlet of the top condenser is connected to the buffer tank and the top reflux pump in sequence. The top reflux pump outlet is divided into two paths, one is connected to the top reflux port, and the other is used to discharge 1,2-butadiene liquid product.

[0023] Compared with the prior art, the beneficial technical effects of the utility model are:

[0024] 1. The pasteurized two-stage packed distillation tower for 1,2-butadiene distillation of the utility model is used for the heavy removal distillation process in the process of purifying 1,2-butadiene products in a continuous distillation mode of first removing light and then removing heavy. First, continuous heavy removal distillation is performed through the two-stage distillation packing sections, and then pasteurization is performed through the pasteurization section to obtain a 1,2-butadiene product with high purity and high product yield.

[0025] 2. The utility model can improve the pasteurization effect by arranging the first through-type spiral plate heat exchanger and the second through-type spiral plate heat exchanger in two sections of the pasteurization packing layer. The material is firstly subjected to medium-temperature pasteurization through the first through-type spiral plate heat exchanger and the middle and lower part of the pasteurization packing layer, and then subjected to high-temperature pasteurization through the upper part of the pasteurization packing layer and the second through-type spiral plate heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a pasteurized two-stage packed distillation tower for 1,2-butadiene distillation of the utility model;

[0027] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0028] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0029] Figure 4 for Figure 1 A three-dimensional view of a support plate for a medium distillation packing;

[0030] Figure numerals: 1-tower body, 101-feed port, 102-stabilizer injection port, 103-nitrogen injection port, 104-liquid outlet, 105-bottom reflux port, 106-product outlet, 107-tower top reflux port, 108-first through-type spiral plate heat exchanger, 1081-first closed spiral hot side flow channel, 1082-first axial through cold side flow channel, 109-second through-type spiral plate heat exchanger, 109 1-second closed spiral hot side flow channel, 1092-second axial through cold side flow channel, 110-pasteurization packing layer, 111-distillation packing support plate, 2-tower bottom reboiler, 3-tower bottom circulation pump, 4-tower top condenser, 5-buffer tank, 6-tower top reflux pump, 7-first diverter three-way valve, 8-second diverter three-way valve, 9-high temperature air source heat pump, 10-first collecting three-way valve, 11-second collecting three-way valve. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0032] In the description of the present utility model, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set, they can be directly connected, or indirectly connected through an intermediate medium, or they can be internally connected between two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0033] Example 1

[0034] like Figure 1-4 As shown, a pasteurized two-stage packed distillation tower for 1,2-butadiene distillation provided in this embodiment includes a tower body 1, a tower bottom reboiler 2, and a tower top condenser 4, wherein the tower bottom reboiler 2 and the tower top condenser 4 are both arranged outside the tower body 1;

[0035] The middle part of the tower body 1 is provided with a feed inlet 101, the bottom of the tower body 1 is provided with a liquid outlet 104, the lower part is provided with a tower kettle reflux port 105, the liquid outlet 104 is connected with the tower kettle reboiler 2 and the tower kettle reflux port 105 in sequence through pipelines, the top of the tower body 1 is provided with a product outlet 106, the product outlet 106 is connected with the hot side inlet of the tower top condenser 4, the hot side outlet of the tower top condenser 4 discharges 1,2-butadiene liquid product, the hot side medium inlet of the tower kettle reboiler 2 is connected to the condensate water supply pipeline outside the boundary, the hot side medium outlet of the tower kettle reboiler 2 is connected to the condensate water return pipeline outside the boundary, the cold side medium inlet of the tower top condenser 4 is connected to the circulating cooling water supply pipeline outside the boundary, the cold side medium outlet of the tower top condenser 4 is connected to the circulating cooling water return pipeline outside the boundary, and a pasteurization section and two distillation packing sections are provided from top to bottom in the tower body 1;

[0036] The pasteurization section includes a pasteurization packing layer 110 and a first through-type spiral plate heat exchanger 108 , and the pasteurization packing layer 110 is arranged on the top of the first through-type spiral plate heat exchanger 108 ;

[0037] The first through-type spiral plate heat exchanger 108 includes a first closed spiral hot side flow channel 1081 and a first axial through cold side flow channel 1082. The inlet of the first closed spiral hot side flow channel 1081 is connected to the condensate water supply pipeline through a first heating branch pipe, and the outlet of the first closed spiral hot side flow channel 1081 is connected to the hot side medium inlet of the tower bottom reboiler 2 through a first return water branch pipe.

[0038] The pasteurized two-stage packed distillation tower for 1,2-butadiene distillation in this embodiment is used for the de-heavy distillation process in the process of purifying 1,2-butadiene products by continuous distillation in which the light is first removed and the heavy is then removed. The heavy component of the butadiene extraction unit of the ethylene device is used as the initial raw material for purifying the 1,2-butadiene product. After the light distillation of the 1,3-butadiene concentration tower in the light distillation process, the de-lightened heavy component is extracted from the kettle of the 1,3-butadiene concentration tower. The de-lightened heavy component is used as the raw material for the de-heavy distillation and is fed into the tower body 1 through the feed port 101. After the de-heavy distillation of the two-stage distillation packing section and the pasteurization of the one-stage pasteurization section, the de-heavy component is extracted from the tower top product outlet 106.

[0039] In this embodiment, the out-of-boundary condensed water is used as a heat source, and the waste heat of the out-of-boundary condensed water is recovered and utilized, and the bottom temperature of the tower is controlled at 62-68°C.

[0040] Specifically, the condensate water supply pipeline is provided with a first diverting three-way valve 7 and a first collecting three-way valve 10, the inlet and one of the outlets of the first diverting three-way valve 7 are connected to the condensate water supply pipeline, the other outlet of the first diverting three-way valve 7 is connected to the inlet of the first heating branch pipe, the inlet and one of the outlets of the first collecting three-way valve 10 are connected to the condensate water supply pipeline, and the other outlet of the first collecting three-way valve 10 is connected to the outlet of the first return branch pipe. The condensate water from outside the boundary is divided into two paths, one path enters the tower kettle reboiler 2 through the condensate water supply pipeline, and the other path enters the first through-type spiral plate heat exchanger 108 through the first heating branch pipe and then enters the tower kettle reboiler 2 in parallel.

[0041] In this embodiment, the width of the first closed spiral hot side flow channel 1081 is smaller than the width of the first axial through cold side flow channel 1082. The first through spiral plate heat exchanger 108 has both heating and pasteurization filler support functions. The pasteurization filler layer 110 is 1.2 meters high, which is equivalent to four theoretical plates. The pasteurization filler layer 110 uses regular plate corrugated filler, the filler wire diameter is not less than 0.6 mm, the minimum pore diameter is 0.6 mm, and the average pore diameter is ≥0.75 mm.

[0042] Specifically, the distillation packing section includes a distillation packing support plate 111 and a distillation packing layer, the distillation packing layer is arranged on the distillation packing support plate 111, the distillation packing support plate 111 adopts a corrugated plate structure, the distillation packing support plate 111 is evenly provided with gas distribution holes, and the distillation packing layer adopts high-efficiency wire mesh packing. The distillation packing support plate 111 has the functions of both packing support and uniform gas distribution.

[0043] In this embodiment, the packing of the distillation packing layer is 3 meters high, the theoretical number of packing plates per meter is ≥ four, the packing wire diameter is not less than 0.6mm, the minimum pore size is 0.5mm, and the average pore size is ≥ 0.7mm; the wave height on the distillation packing support plate is 100mm, the pore size of the air distribution hole is 3mm, and the air distribution holes are arranged in a regular triangle shape, and the opening rate is between 35% and 42%.

[0044] Specifically, a tower bottom circulation pump 3 is arranged on the pipeline between the liquid outlet 104 and the tower bottom reboiler 2, a stabilizer injection port 102 is arranged at the lower part of the tower body 1, and a nitrogen injection port 103 is arranged at the upper part thereof. In this embodiment, during the heavy distillation, a stabilizer is injected into the tower body 1 through the stabilizer injection port 102, and the stabilizer is tributyl citrate (TBC) and 3,4-dimethyl aromatic amine compounded in a mass ratio of 1:1. During the light distillation, the top pressure of the tower body 1 is also controlled by controlling the flow of supplementary nitrogen and circulating cooling water. Nitrogen is injected through the nitrogen injection port 103, and the circulating cooling water is circulated through the outer circulating cooling water supply pipeline, the tower top condenser 4 and the circulating cooling water return pipeline. The top pressure of the tower body 1 is controlled in the range of 200 to 300 kPa.G.

[0045] Example 2

[0046] On the basis of Example 1, a second through-type spiral plate heat exchanger 109 is further arranged on the top of the pasteurization filler layer 110. The second through-type spiral plate heat exchanger 109 includes a second closed spiral hot side flow channel 1091 and a second axial through cold side flow channel 1092. The inlet of the second closed spiral hot side flow channel 1091 is connected to the first heating branch pipe through a second heating branch pipe, and the outlet of the second closed spiral hot side flow channel 1091 is connected to the first return water branch pipe through a second return water branch pipe. A high-temperature air source heat pump 9 is provided on the second heating branch pipe.

[0047] In this embodiment, the temperature of the hot water output by the high-temperature air source heat pump 9 is between 75 and 90° C. By arranging a first through-type spiral plate heat exchanger 108 and a second through-type spiral plate heat exchanger 109 to improve the pasteurization effect, the material is firstly subjected to medium-temperature pasteurization through the first through-type spiral plate heat exchanger 108 and the lower middle part of the pasteurization packing layer 110, and then subjected to high-temperature pasteurization through the upper part of the pasteurization packing layer 110 and the second through-type spiral plate heat exchanger 109.

[0048] Specifically, a second diverting three-way valve 8 is provided on the first heating branch pipe, and a second collecting three-way valve 11 is provided on the first return water branch pipe. The inlet and one of the outlets of the second diverting three-way valve 8 are connected to the first heating branch pipe, and the other outlet is connected to the inlet of the second heating branch pipe. The inlet and one of the outlets of the second collecting three-way valve 11 are connected to the first return water branch pipe, and the other outlet of the second collecting three-way valve 11 is connected to the outlet of the second return water branch pipe. The condensate entering the first heating branch pipe is diverted for a second time through the second diversion three-way valve 8. One path enters the first through-type spiral plate heat exchanger 108 through the first heating branch pipe, and the other path enters the high-temperature air source heat pump 9 through the second heating branch pipe for heating and then enters the second through-type spiral plate heat exchanger 109. The condensate flowing out of the first through-type spiral plate heat exchanger 108 and the second through-type spiral plate heat exchanger 109 is connected through the second collecting three-way valve 11, and then connected with the condensate supply pipeline for a second time through the first collecting three-way valve 10. The condensate connected for the second time flows through the tower bottom reboiler 2 and then flows into the condensate return pipeline.

[0049] In this embodiment, the width of the second closed spiral hot-side flow channel 1091 is smaller than the width of the second axial through cold-side flow channel 1092 .

[0050] In this embodiment, a tower top reflux port 107 is provided at the upper part of the tower body 1, and the hot side outlet of the tower top condenser 4 is connected to the buffer tank 5 and the tower top reflux pump 6 in sequence. The tower top reflux pump 6 outlet is divided into two paths, one of which is connected to the tower top reflux port 107, and the other is used to discharge the 1,2-butadiene liquid product. The reflux ratio of the material pumped by the tower top reflux pump 6 is controlled at 25-30.

[0051] The above is a preferred embodiment of the utility model, which is used to explain the technical solution of the utility model in more detail, so that those skilled in the art can understand and use the utility model well. Those skilled in the art can also make routine modifications, equivalent substitutions and improvements within the spirit and principles of the utility model.

Claims

1. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation, characterized in that: It includes a tower body, a tower kettle reboiler, and a tower top condenser, wherein the tower kettle reboiler and the tower top condenser are both arranged outside the tower body; The middle part of the tower body is provided with a feed inlet, the bottom part is provided with a liquid outlet, the lower part is provided with a tower kettle reflux port, the liquid outlet port is connected with the tower kettle reboiler and the tower kettle reflux port in sequence through pipelines, the top of the tower body is provided with a product outlet, the product outlet is connected with the hot side inlet of the tower top condenser, the hot side outlet of the tower top condenser discharges 1,2-butadiene liquid product, the hot side medium inlet of the tower kettle reboiler is connected with the condensate water supply pipeline outside the boundary, the hot side medium outlet of the tower kettle reboiler is connected with the condensate water return pipeline outside the boundary, the cold side medium inlet of the tower top condenser is connected with the circulating cooling water supply pipeline outside the boundary, the cold side medium outlet of the tower top condenser is connected with the circulating cooling water return pipeline outside the boundary, and a pasteurization section and two distillation packing sections are provided from top to bottom in the tower body; The pasteurization section comprises a pasteurization packing layer and a first through-type spiral plate heat exchanger, wherein the pasteurization packing layer is arranged on the top of the first through-type spiral plate heat exchanger; The first through-type spiral plate heat exchanger includes a first closed spiral hot side flow channel and a first axial through cold side flow channel. The inlet of the first closed spiral hot side flow channel is connected to the condensate water supply pipeline through a first heating branch pipe, and the outlet of the first closed spiral hot side flow channel is connected to the hot side medium inlet of the tower kettle reboiler through a first return water branch pipe.

2. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 1, characterized in that: A first diverter three-way valve and a first collecting three-way valve are provided on the condensate water supply pipeline. The inlet and one of the outlets of the first diverter three-way valve are connected to the condensate water supply pipeline, and the other outlet of the first diverter three-way valve is connected to the inlet of the first heating branch pipe. The inlet and one of the outlets of the first collecting three-way valve are connected to the condensate water supply pipeline, and the other outlet of the first collecting three-way valve is connected to the outlet of the first return water branch pipe.

3. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 2, characterized in that: A second through-type spiral plate heat exchanger is also arranged on the top of the pasteurization filler layer. The second through-type spiral plate heat exchanger includes a second closed spiral hot side flow channel and a second axial through cold side flow channel. The inlet of the second closed spiral hot side flow channel is connected to the first heating branch pipe through a second heating branch pipe, and the outlet of the second closed spiral hot side flow channel is connected to the first return water branch pipe through a second return water branch pipe. A high-temperature air source heat pump is arranged on the second heating branch pipe.

4. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 3, characterized in that: A second diverting three-way valve is provided on the first heating branch pipe, and a second collecting three-way valve is provided on the first return branch pipe. The inlet and one of the outlets of the second diverting three-way valve are connected to the first heating branch pipe, and the other outlet is connected to the inlet of the second heating branch pipe. The inlet and one of the outlets of the second collecting three-way valve are connected to the first return branch pipe, and the other outlet of the second collecting three-way valve is connected to the outlet of the second return branch pipe.

5. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 4, characterized in that: The width of the first closed spiral hot side flow channel is smaller than the width of the first axial through cold side flow channel, and the width of the second closed spiral hot side flow channel is smaller than the width of the second axial through cold side flow channel.

6. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 5, characterized in that: The pasteurized packing layer has a height of 1.2 meters, which is equivalent to four theoretical plates. The pasteurized packing layer adopts regular plate corrugated packing, the packing wire diameter is not less than 0.6 mm, the minimum pore diameter is 0.6 mm, and the average pore diameter is ≥0.75 mm.

7. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 6, characterized in that: The distillation packing section comprises a distillation packing support plate and a distillation packing layer. The distillation packing layer is arranged on the distillation packing support plate. The distillation packing support plate adopts a corrugated plate structure. The distillation packing support plate is evenly provided with air distribution holes. The distillation packing layer adopts a high-efficiency wire mesh packing.

8. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 7, characterized in that: The packing of the distillation packing layer is 3 meters high, the theoretical number of packing plates per meter is ≥ four, the packing wire diameter is not less than 0.6mm, the minimum pore diameter is 0.5mm, and the average pore diameter is ≥0.7mm; the wave height on the distillation packing support plate is 100mm, the pore diameter of the air distribution is 3mm, and the air distribution pores are arranged in a regular triangle shape, with an opening rate between 35% and 42%.

9. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 1, characterized in that: A tower bottom circulation pump is arranged on the pipeline between the liquid outlet and the tower bottom reboiler, a stabilizer injection port is arranged at the lower part of the tower body, and a nitrogen injection port is arranged at the upper part thereof.

10. A pasteurized two-stage packed distillation tower for 1,2-butadiene distillation according to claim 1, characterized in that: A top reflux port is provided on the upper part of the tower body, and the hot side outlet of the top condenser is connected to the buffer tank and the top reflux pump in sequence. The top reflux pump outlet is divided into two paths, one of which is connected to the top reflux port and the other is used to discharge 1,2-butadiene liquid product.

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