Tower type post-treatment device for ethoxylation reaction

Abstract

The utility model provides a tower-type post-treatment device for ethoxylation reaction, the tower-type post-treatment device comprises at least one stage of packed tower, a tail gas condenser and a finished product storage tank, the bottom outlet of the packed tower is connected with the finished product storage tank, the top of the finished product storage tank is connected with the lower part of the packed tower through an air pressure balance pipeline, and the tail gas condenser is connected with the air pressure balance pipeline. A top outlet of the packed tower is connected with the tail gas condenser; a liquid material distributor, a packing layer, a packing bracket and a material collecting cavity are sequentially arranged in the packed tower from top to bottom. According to the utility model, the packed tower is used as main equipment of the post-treatment device, the mass transfer area is increased through the arrangement of the packing layer and the liquid distributor, and materials are dispersed into fine liquid drops to be in full contact with the packing, so that the separation efficiency is improved; according to the heat of the primary product of the ethoxylation reaction, light components are fully removed, materials do not need to be additionally heated, and the treatment cost is reduced; the device is simple in structure, easy and convenient to operate, capable of being continuously operated and wider in application range.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic product processing and separation, and relates to a tower-type post-treatment device for ethoxylation reaction. Background Technique

[0002] Ethoxylation reaction mainly refers to a class of ring-opening addition reactions that occur between ethylene oxide and organic compounds containing active hydrogen under the action of a catalyst. One of the important uses of its generated products is as surfactants, especially as non-ionic surfactants. During the ring-opening polymerization process of ethylene oxide, some side reactions will inevitably occur at the same time. The by-products generated include dioxane, which is a harmful component with a pungent odor and needs to be removed, that is, post-treatment of the reaction is required to remove harmful components such as free ethylene oxide and by-product dioxane from the initial product of the ethoxylation reaction.

[0003] At present, for traditional ethoxylation reaction devices, a stirred reaction kettle is usually used, and its post-treatment is generally carried out in the reaction kettle after the ethoxylation reaction ends, and harmful light components are removed by heating and vacuum pumping; for more advanced loop injection or loop spray ethoxylation reaction devices, after the reaction ends, the ethoxylated product will be transferred to a post-treatment kettle for post-treatment, that is, the post-treatment of the above reaction devices is carried out in kettle-type equipment. Due to the small specific surface area of the liquid material in the kettle and low mass transfer efficiency, the removal of by-products takes a long time and is not thorough, ultimately resulting in the residue of harmful components such as ethylene oxide and dioxane.

[0004] CN 203540086U discloses a centrifugal spray dioxane removal device for ethoxylated alkyl sulfates. The device includes a feed inlet, a feeding device, a centrifugal spray tower, a discharging device, and a discharging outlet connected in sequence, and a recycling device that transports the material at the recycling outlet of the centrifugal spray tower to the feed inlet through a pipeline. In the centrifugal spray tower, the raw material inlet is connected to the feeding device, dry air is introduced into the air inlet, the finished product outlet is connected to the discharging device, and the recycling outlet is connected to the recycling device. The product prepared by this device is an anionic surfactant, and its product is in an aqueous solution state. It can be post-treated by a centrifugal spray tower, but it is not suitable to use a packed tower, otherwise it is easy to cause solid adhesion and packing blockage due to water evaporation.

[0005] CN 101092426 A discloses a reaction system for continuously producing chloropropyltriethoxysilane and its synthesis method. The liquid outlet at the bottom of the ethanol storage tank in the reaction system is connected to a second heat exchanger. The gas outlet of the second heat exchanger is connected to the gas inlet at the lower part of a stripping column. The gas outlet at the top of the stripping column is connected to the gas inlet of a third heat exchanger. The gas outlet of the third heat exchanger is connected to the gas inlet of a first air extraction ceramic pump. The liquid outlet of the third heat exchanger is connected to the liquid inlet of an esterification reactor. Although the stripping column is also filled with packing, its main unit operation is stripping rather than just the separation function of the packing. The crude product cannot be separated and purified only by a packed column.

[0006] In summary, for the post-treatment device of ethoxylation reaction, it is necessary to select appropriate separation equipment and separation operations according to the composition of the reaction materials to achieve efficient removal of harmful components such as by-products, improve the separation efficiency, simplify the equipment structure, and reduce the cost. Utility Model Content

[0007] Aiming at the problems existing in the prior art, the purpose of the present utility model is to provide a tower-type post-treatment device for ethoxylation reaction. The device uses a packed column as the post-treatment device for the reaction, utilizes the tower-type equipment and packing to increase the mass transfer area, and then uses the heat of the reaction materials themselves to achieve the separation of light components in the crude product, effectively improving the separation efficiency, without additional heating, and reducing the treatment cost.

[0008] To achieve this purpose, the present utility model adopts the following technical solutions:

[0009] The present utility model provides a tower-type post-treatment device for ethoxylation reaction. The tower-type post-treatment device includes at least one stage of packed column, a tail gas condenser and a finished product storage tank. The upper part of the packed column is provided with an inlet for the crude product of ethoxylation reaction. The bottom outlet of the packed column is connected to the inlet of the finished product storage tank. The top of the finished product storage tank and the lower part of the packed column are connected by a pressure balance pipeline. The top outlet of the packed column is connected to the inlet of the tail gas condenser.

[0010] Inside the packed column, a liquid material distributor, a packing layer, a packing support and a material collection chamber are successively arranged from top to bottom.

[0011] In the present utility model, for the post-treatment process of ethoxylation organic reaction, especially when the ethoxylation product is a non-ionic surfactant, by utilizing the characteristics of the reaction materials, a packed tower is used as the main equipment for the post-treatment process. The mass transfer area is increased by setting a packing layer. Meanwhile, a liquid distributor is arranged in the packed tower to disperse it into fine droplets and then fully contact with the packing, thereby improving the separation efficiency. According to the heat of the initial product of the ethoxylation reaction, through the setting of at least one stage of packed tower, the sufficient removal of light components can be achieved without additional heating of the materials, effectively reducing the processing cost of the materials. The device has a simple structure, is easy to operate, can be continuously operated, and has a wider application range.

[0012] The following are the preferred technical solutions of the present utility model, but not the limitations of the technical solutions provided by the present utility model. Through the following technical solutions, the technical objectives and beneficial effects of the present utility model can be better achieved.

[0013] As a preferred technical solution of the present utility model, the tower-type post-treatment device is a tower-type post-treatment device for preparing ethoxylated non-ionic surfactant by ethoxylation reaction, that is, the product obtained by the ethoxylation reaction is an ethoxylated non-ionic surfactant, and its types include fatty alcohol polyoxyethylene ether AEO, fatty acid methyl ester ethoxylate FMEE, or oil ethoxylate SOE, etc.

[0014] As a preferred technical solution of the present utility model, the packed tower includes two stages, namely the first packed tower and the second packed tower, and the bottom outlet of the first packed tower is connected to the upper inlet of the second packed tower.

[0015] As a preferred technical solution of the present utility model, the tower-type post-treatment device further includes a first feed pump and a second feed pump. The first feed pump is located on the feed pipeline of the first packed tower, and the second feed pump is located on the feed pipeline of the second packed tower.

[0016] In the present utility model, through the setting of two stages of serially connected packed towers, the separation degree of ethylene oxide and by-products in the initial product of the ethoxylation reaction can be effectively improved. The internal structures of the two stages of packed towers are basically the same, and the number of stages of the packed tower can also be selected according to the impurity component content of the material to be separated, so as to be suitable for the treatment of reaction materials with different impurity contents.

[0017] As a preferred technical solution of the present utility model, the bottom outlet of the second packed tower is connected to the inlet of the finished product storage tank. The top of the finished product storage tank and the lower part of the second packed tower are connected by a gas pressure balance pipeline. The top outlets of the first packed tower and the second packed tower are both connected to the inlet of the tail gas condenser.

[0018] In the present utility model, the provision of the air pressure balance pipeline between the second packing tower and the finished product storage tank can keep the gas pressures between the two consistent, avoiding the problem that the liquid product is difficult to flow into the finished product storage tank due to unbalanced pressures between the two.

[0019] As a preferred technical solution of the present utility model, the liquid material distributor is located below the inlet of the packing tower. A number of round holes are evenly provided on the liquid material distributor, and the aperture of the round holes is 1 - 5 mm, such as 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc., but not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0020] As a preferred technical solution of the present utility model, the packing in the packing layer is ceramic packing, including Raschig rings or Pall rings. The diameter of the packing is 25 - 50 mm, such as 25 mm, 30 mm, 35 mm, 40 mm, 45 mm or 50 mm, etc., but not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0021] As a preferred technical solution of the present utility model, the packing support is fixed on the inner wall of the packing tower. The packing support is a stainless - steel grid packing support, and the spacing between adjacent grids in the packing support is 15 - 25 mm, such as 15 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm or 25 mm, etc., but not limited to the listed values. Other unlisted values within this numerical range are equally applicable.

[0022] In the present utility model, the spacing between the grids in the packing support should be smaller than the diameter of the packing to prevent the packing from leaking out through the grids.

[0023] As a preferred technical solution of the present utility model, the tower - type post - treatment device further includes a vacuum pump. The vacuum pump is connected to the outlet of the tail gas condenser, and the connection pipeline between the top outlet of the packing tower and the tail gas condenser is a vacuum pipeline.

[0024] As a preferred technical solution of the present utility model, the vacuum pump includes a water - ring vacuum pump or a rotary vane vacuum pump, and the tail gas condenser is a liquid - cooled heat exchanger.

[0025] In the present utility model, the temperature of the non - ionic surfactant primary product obtained after ethoxylation reaction is about 140 - 160 °C, such as 140 °C, 145 °C, 150 °C, 155 °C or 160 °C, etc. Utilizing its own heat and under the action of the packing in the packing tower, and through the provision of the vacuum pump, a vacuum state is maintained inside the packing tower, which helps the separated ethylene oxide and dioxane to be quickly discharged and condensed and collected by the tail gas condenser.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] (1) The utility model uses a packed tower as the main equipment of the post-treatment device, and increases the mass transfer area through the setting of at least one stage of packed tower and the internal packing layer. At the same time, a liquid distributor is arranged in the packed tower to disperse it into fine liquid droplets and fully contact with the packing, thereby improving the separation efficiency;

[0028] (2) According to the heat of the initial product of the ethoxylation reaction, the utility model can fully remove light components. The content of free ethylene oxide in the product is less than 1 ppm, and the content of by-product dioxane is less than 5 ppm. There is no need to heat the material additionally, effectively reducing the processing cost of the material;

[0029] (3) The device of the utility model has a simple structure, is easy to operate, can be continuously operated, and has a wider application range. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a tower-type post-treatment device for ethoxylation reaction provided in Embodiment 1 of the utility model;

[0031] Figure 2 is a schematic internal structure diagram of the packed tower provided in Embodiment 1 of the utility model;

[0032] Among them, 11 - the first packed tower, 12 - the second packed tower, 2 - the tail gas condenser, 3 - the finished product storage tank, 41 - the first feed pump, 42 - the second feed pump, 5 - the liquid material distributor, 6 - the packing layer, 7 - the packing support, 8 - the material collection chamber, 9 - the vacuum pump. Detailed Embodiments

[0033] To better illustrate the utility model and facilitate the understanding of its technical solutions, the following further details the utility model. However, the following embodiments are only simple examples of the utility model and do not represent or limit the scope of the patent protection of the utility model. The scope of protection of the utility model is subject to the claims.

[0034] The following are typical but non-limiting embodiments of the utility model:

[0035] Embodiment 1:

[0036] This embodiment provides a tower-type post-treatment device for ethoxylation reaction. The schematic structural diagram of the tower-type post-treatment device is as shown in Figure 1As shown, it includes a two-stage packed tower, a tail gas condenser 2 and a finished product storage tank 3. The upper part of the packed tower is provided with an inlet for the initial product of ethoxylation reaction. The bottom outlet of the packed tower is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the packed tower are connected by a pressure balance pipeline. The top outlet of the packed tower is connected to the inlet of the tail gas condenser 2;

[0037] The internal structure schematic diagram of the packed tower is as Figure 2 shown, and a liquid material distributor 5, a packing layer 6, a packing support 7 and a material collection chamber 8 are successively arranged from top to bottom.

[0038] The product obtained by the ethoxylation reaction is an ethoxylated nonionic surfactant, and specifically fatty alcohol polyoxyethylene ether AEO is selected.

[0039] The packed tower includes two stages, namely a first packed tower 11 and a second packed tower 12. The bottom outlet of the first packed tower 11 is connected to the upper inlet of the second packed tower 12.

[0040] The tower-type post-treatment device further includes a first feed pump 41 and a second feed pump 42. The first feed pump 41 is located on the feed pipeline of the first packed tower 11, and the second feed pump 42 is located on the feed pipeline of the second packed tower 12.

[0041] The bottom outlet of the second packed tower 12 is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the second packed tower 12 are connected by a pressure balance pipeline. The top outlets of the first packed tower 11 and the second packed tower 12 are both connected to the inlet of the tail gas condenser 2.

[0042] The liquid material distributor 5 is located below the inlet of the packed tower. The liquid material distributor 5 is evenly provided with a number of round holes, and the aperture of the round holes is 3 mm.

[0043] The packing in the packing layer 6 is ceramic packing, including Raschig rings, and the diameter of the packing is 40 mm.

[0044] The packing support 7 is fixed on the inner wall of the packed tower. The packing support 7 is a stainless steel grid packing support, and the distance between adjacent grids in the packing support is 20 mm.

[0045] The tower-type post-treatment device further includes a vacuum pump 9. The vacuum pump 9 is connected to the outlet of the tail gas condenser 2, and the connection pipeline between the top outlet of the packed tower and the tail gas condenser 2 is a vacuum pipeline.

[0046] The vacuum pump 9 is a water-ring vacuum pump, and the tail gas condenser 2 is a liquid-cooled shell-and-tube heat exchanger.

[0047] Example 2:

[0048] This embodiment provides a tower-type post-treatment device for ethoxylation reaction. The tower-type post-treatment device includes two-stage packing towers, a tail gas condenser 2 and a finished product storage tank 3. An initial product inlet for ethoxylation reaction is provided at the upper part of the packing tower. The bottom outlet of the packing tower is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the packing tower are connected by a pressure balance pipeline. The top outlet of the packing tower is connected to the inlet of the tail gas condenser 2.

[0049] Inside the packing tower, a liquid material distributor 5, a packing layer 6, a packing support 7 and a material collection chamber 8 are successively arranged from top to bottom.

[0050] The product obtained from the ethoxylation reaction is an ethoxylated non-ionic surfactant, specifically, fatty alcohol polyoxyethylene ether AEO is selected.

[0051] The packing tower includes two stages, namely a first packing tower 11 and a second packing tower 12. The bottom outlet of the first packing tower 11 is connected to the upper inlet of the second packing tower 12.

[0052] The tower-type post-treatment device further includes a first feed pump 41 and a second feed pump 42. The first feed pump 41 is located on the feed pipeline of the first packing tower 11, and the second feed pump 42 is located on the feed pipeline of the second packing tower 12.

[0053] The bottom outlet of the second packing tower 12 is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the second packing tower 12 are connected by a pressure balance pipeline. The top outlets of the first packing tower 11 and the second packing tower 12 are both connected to the inlet of the tail gas condenser 2.

[0054] The liquid material distributor 5 is located below the inlet of the packing tower. A number of round holes are evenly arranged on the liquid material distributor 5, and the diameter of the round holes is 5 mm.

[0055] The packing in the packing layer 6 is ceramic packing, including Pall rings, and the diameter of the packing is 25 mm.

[0056] The packing support 7 is fixed on the inner wall of the packing tower. The packing support 7 is a stainless steel grid packing support, and the distance between adjacent grids in the packing support is 15 mm.

[0057] The tower-type post-treatment device further includes a vacuum pump 9. The vacuum pump 9 is connected to the outlet of the tail gas condenser 2, and the connection pipeline between the top outlet of the packing tower and the tail gas condenser 2 is a vacuum pipeline.

[0058] The vacuum pump 9 is a rotary vane vacuum pump, and the tail gas condenser 2 is a liquid-cooled shell-and-tube heat exchanger.

[0059] Example 3:

[0060] This example provides a tower post-treatment device for ethoxylation reaction. The tower post-treatment device includes two-stage packing towers, a tail gas condenser 2 and a finished product storage tank 3. An ethoxylation reaction initial product inlet is provided at the upper part of the packing tower. The bottom outlet of the packing tower is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the packing tower are connected by a pressure balance pipeline. The top outlet of the packing tower is connected to the inlet of the tail gas condenser 2.

[0061] Inside the packing tower, a liquid material distributor 5, a packing layer 6, a packing support 7 and a material collection chamber 8 are successively arranged from top to bottom.

[0062] The product obtained from the ethoxylation reaction is an ethoxylated non-ionic surfactant, specifically fatty acid methyl ester ethoxylate FMEE is selected.

[0063] The packing tower includes two stages, namely a first packing tower 11 and a second packing tower 12. The bottom outlet of the first packing tower 11 is connected to the upper inlet of the second packing tower 12.

[0064] The tower post-treatment device further includes a first feed pump 41 and a second feed pump 42. The first feed pump 41 is located on the feed pipeline of the first packing tower 11, and the second feed pump 42 is located on the feed pipeline of the second packing tower 12.

[0065] The bottom outlet of the second packing tower 12 is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the second packing tower 12 are connected by a pressure balance pipeline. The top outlets of the first packing tower 11 and the second packing tower 12 are both connected to the inlet of the tail gas condenser 2.

[0066] The liquid material distributor 5 is located below the inlet of the packing tower. A number of round holes are evenly arranged on the liquid material distributor 5, and the aperture of the round holes is 1 mm.

[0067] The packing in the packing layer 6 is ceramic packing, including Raschig rings, and the diameter of the packing is 50 mm.

[0068] The packing support 7 is fixed on the inner wall of the packing tower. The packing support 7 is a stainless steel grid packing support, and the distance between adjacent grids in the packing support is 25 mm.

[0069] The tower post-treatment device further includes a vacuum pump 9. The vacuum pump 9 is connected to the outlet of the tail gas condenser 2, and the connection pipeline between the top outlet of the packing tower and the tail gas condenser 2 is a vacuum pipeline.

[0070] The vacuum pump 9 is a water-ring vacuum pump, and the tail gas condenser 2 is a liquid-cooled shell-and-tube heat exchanger.

[0071] Example 4:

[0072] This example provides a tower post-treatment device for ethoxylation reaction. The tower post-treatment device includes a primary packing tower, a tail gas condenser 2, and a finished product storage tank 3. An ethoxylation reaction primary product inlet is provided at the upper part of the packing tower. The bottom outlet of the packing tower is connected to the inlet of the finished product storage tank 3. The top of the finished product storage tank 3 and the lower part of the packing tower are connected by a pressure balance pipeline. The top outlet of the packing tower is connected to the inlet of the tail gas condenser 2.

[0073] Inside the packing tower, a liquid material distributor 5, a packing layer 6, a packing support 7, and a material collection chamber 8 are successively arranged from top to bottom.

[0074] The product obtained from the ethoxylation reaction is an ethoxylated non-ionic surfactant, specifically selecting oil ethoxylate SOE.

[0075] The tower post-treatment device further includes a feed pump, and the feed pump is located on the feed pipeline of the packing tower.

[0076] The liquid material distributor 5 is located below the inlet of the packing tower. A number of round holes are evenly arranged on the liquid material distributor 5, and the aperture of the round holes is 2 mm.

[0077] The packing in the packing layer 6 is ceramic packing, including Raschig rings, and the diameter of the packing is 30 mm.

[0078] The packing support 7 is fixed on the inner wall of the packing tower. The packing support 7 is a stainless steel grid packing support, and the distance between adjacent grids in the packing support is 18 mm.

[0079] The tower post-treatment device further includes a vacuum pump 9. The vacuum pump 9 is connected to the outlet of the tail gas condenser 2, and the connection pipeline between the top outlet of the packing tower and the tail gas condenser 2 is a vacuum pipeline.

[0080] The vacuum pump 9 is a rotary vane vacuum pump, and the tail gas condenser 2 is a liquid-cooled shell-and-tube heat exchanger.

[0081] Using the tower-type post-treatment device in the above embodiment to remove light components from the initial product of ethoxylated nonionic surfactant, the temperature is approximately 140 - 160°C. After entering the first packing tower 11 through the first feed pump 41, it is dispersed into small droplets by the liquid material distributor 5, and then fully contacts the ceramic packing in the packing layer 6. The mass transfer specific surface area of the material is greatly increased. Under the condition of vacuum pumping, the light components ethylene oxide and dioxane in the initial product can be separated and removed by using the heat of the material itself. The temperature of the material passing through the first packing tower 11 drops to 110 - 130°C, and it can also enter the second packing tower 12 to further remove the light components by using the same structure and principle. The content of free ethylene oxide in the product is less than 1 ppm, and the content of by-product dioxane is less than 5 ppm. The finished product material enters the finished product storage tank 3 for storage. Among them, the tail gas condenser 2 and the vacuum pump 9 are used to provide a vacuum environment for the post-treatment device and condense and collect the removed tail gas.

[0082] As can be seen from the above embodiments, the present invention uses a packing tower as the main device of the post-treatment device, increases the mass transfer area by setting at least one packing tower and the internal packing layer, and at the same time sets a liquid distributor in the packing tower to disperse it into fine droplets and then fully contact the packing, thereby improving the separation efficiency. According to the heat of the initial product of the ethoxylation reaction itself, the light components can be fully removed. The content of free ethylene oxide in the product is less than 1 ppm, and the content of by-product dioxane is less than 5 ppm. There is no need to heat the material additionally, effectively reducing the processing cost of the material. The device has a simple structure, is easy to operate, can be continuously operated, and has a wider application range.

[0083] The applicant declares that the present invention uses the above embodiments to illustrate the detailed device of the present invention, but the present invention is not limited to the above detailed device, that is, it does not mean that the present invention must rely on the above detailed device to be implemented. Those skilled in the art should understand that any improvement to the present invention, equivalent replacement of the device of the present invention, addition of auxiliary devices, selection of specific methods, etc. all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A tower post-treatment device for ethoxylation reaction, characterized in that: The tower post-processing device comprises at least one level of packed tower, a tail gas condenser and a finished product storage tank, wherein the upper portion of the packed tower is provided with an inlet for the initial product of the ethoxylation reaction, the bottom outlet of the packed tower is connected to the inlet of the finished product storage tank, the top of the finished product storage tank and the lower portion of the packed tower are connected by a gas pressure balance pipeline, and the top outlet of the packed tower is connected to the inlet of the tail gas condenser; The inside of the packing tower is provided with a liquid material distributor, a packing layer, a packing support and a material collecting chamber in sequence from top to bottom.

2. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The product obtained by the ethoxylation reaction includes ethoxylated nonionic surfactant.

3. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The packed tower comprises two stages, namely a first packed tower and a second packed tower, wherein the bottom outlet of the first packed tower is connected to the upper inlet of the second packed tower.

4. The tower post-treatment device for ethoxylation reaction according to claim 3, characterized in that: The tower post-processing device further comprises a first feed pump and a second feed pump, wherein the first feed pump is located on a feed pipeline of the first packed tower, and the second feed pump is located on a feed pipeline of the second packed tower.

5. The tower post-treatment device for ethoxylation reaction according to claim 3, characterized in that: The bottom outlet of the second packed tower is connected to the inlet of the finished product storage tank, the top of the finished product storage tank and the lower part of the second packed tower are connected by an air pressure balance pipeline, and the top outlets of the first packed tower and the second packed tower are both connected to the inlet of the tail gas condenser.

6. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The liquid material distributor is located below the inlet of the packing tower. A plurality of circular holes are evenly arranged on the liquid material distributor. The diameter of the circular holes is 1 to 5 mm.

7. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The filler in the packing layer is a ceramic filler, including a Raschig ring or a Pall ring, and the diameter of the filler is 25 to 50 mm.

8. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The packing support is fixed on the inner wall of the packing tower. The packing support is a stainless steel grid packing support. The spacing between adjacent grids in the packing support is 15 to 25 mm.

9. The tower post-treatment device for ethoxylation reaction according to claim 1, characterized in that: The tower post-processing device further comprises a vacuum pump, which is connected to the outlet of the tail gas condenser. The connecting pipeline between the top outlet of the packed tower and the tail gas condenser is a vacuum pipeline.

10. The tower post-treatment device for ethoxylation reaction according to claim 9, characterized in that: The vacuum pump comprises a water ring vacuum pump or a rotary vane vacuum pump, and the tail gas condenser is a liquid-cooled heat exchanger.

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