Recovery device for sebacic acid tail gas containing sec-octanol

Abstract

The utility model provides a sebacic acid tail gas recovery device containing sec-octanol, which comprises a spray tower, a separation recovery box and a gas adsorption assembly, a gas outlet is arranged at the top of the spray tower and connected with the gas adsorption assembly, a spray pipe is arranged on the upper portion of a spray tower main body, a plurality of stainless steel corrugated fillers are arranged in the spray tower at intervals, and the stainless steel corrugated fillers are connected with the separation recovery box. The lower part of the spray tower is provided with a waste gas input pipe and a liquid recovery pipe, the lower end of the liquid recovery pipe is provided with a plurality of communicated separation recovery boxes, the upper parts of the adjacent separation recovery boxes are communicated, the bottom of the separation recovery box at the head end is provided with a water outlet, and the water outlet is connected with a circulating water pump; and a light phase liquid area at the upper part of the tail end separation recycling box is provided with a sec-octanol recycling opening. According to the utility model, tail gas containing sec-octanol is subjected to countercurrent spraying, washing and cooling, and then is discharged into the separating and recycling box for standing, separating and recycling, so that energy conservation and environmental protection are realized.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, and in particular relates to a device for recovering sebacic acid tail gas containing 2-octanol. Background Technology

[0002] Sebacic acid, a white, flaky crystalline solid, is mainly used to produce esters of sebacic acid, such as dibutyl sebacic acid, dioctyl sebacic acid, and diisooctyl sebacic acid. These esters can be used as plasticizers for plastics and cold-resistant rubbers, and can also be used to produce high-strength, low-density, high-molecular polymers such as Nylon 1010. They are also used in the synthesis of lubricant additives, fragrances, coatings, and cosmetics, making it an important organic chemical raw material. The main reaction principle of sebacic acid production involves adding ricinoleic acid and NaOH solution into a cracking reactor, where a cracking reaction occurs at 300-350°C to produce disodium sebacic acid, 2-octanol, and hydrogen gas. Although 2-octanol is a low-toxicity substance, it can cause harm to the body whether inhaled or absorbed through the skin, and is highly irritating to the skin and eyes, making it unsuitable for direct release into the atmosphere. Furthermore, 2-octanol can react with phthalic anhydride to produce di-2-ol phthalate, a commonly used plasticizer for polyvinyl chloride, and also used in synthetic fiber oils, defoamers, and in the synthesis of surfactants, coal flotation agents, and pesticide emulsifiers. It can also be used as a solvent for oils and waxes, and as a pharmaceutical raw material for the synthesis of the insecticide hexazoline. Chinese invention patent application 202311683132.4 discloses a granulation tail gas treatment device for sebacic acid, including a gas collection hood and an activated carbon adsorption device. A photopyrolysis box connected to both is provided between the activated carbon adsorption device and the gas collection hood. On the side of the activated carbon adsorption device away from the gas collection hood, a spray device for spraying waste gas, a plasma adsorption device for plasma adsorption of waste gas, and a fan for collecting waste gas are sequentially arranged, with adjacent sets of devices interconnected. The above-mentioned device adsorbs and sprays the tail gas generated during the production of sebacic acid, but the 2,3-octanol in the tail gas will also be lost, which is not conducive to saving production costs and is not conducive to environmental protection. Summary of the Invention

[0003] The technical problem solved by this invention is that existing sebacic acid tail gas treatment devices cannot recover useful substances, which is detrimental to environmental protection.

[0004] This invention provides a device for recovering sebacic acid tail gas containing 2-octanol, comprising a spray tower, a separation and recovery box, and a gas adsorption assembly.

[0005] The spray tower has a gas outlet at the top, which is connected to the gas adsorption component. A spray pipe is located on the upper part of the main body of the spray tower. Multiple stainless steel corrugated packing materials are spaced apart inside the spray tower. An exhaust gas inlet pipe and a liquid recovery pipe are located at the bottom of the spray tower. One end of the exhaust gas inlet pipe is an inlet for tail gas containing 2-octanol, and the other end passes through the side wall of the spray tower and extends into the interior. Small holes are evenly distributed on the outer surface of the portion of the exhaust gas inlet pipe located inside the spray tower. The liquid recovery pipe is positioned below the exhaust gas inlet pipe, and multiple interconnected separation and recovery boxes are located at the lower end of the liquid recovery pipe.

[0006] The separation and recovery tank has a top plate at the top and multiple partitions inside. The partitions include vertical and horizontal sections connected at the top and bottom, dividing the tank into a light phase liquid zone and a heavy phase liquid zone. A single-edged blade baffle is provided on the horizontal section of the partition. The upper part of the single-edged blade baffle has a gap with the top plate of the separation and recovery tank. The upper parts of adjacent separation and recovery tanks are connected. The bottom of the first separation and recovery tank is provided with a drain outlet, which is connected to a circulating water pump. The circulating water pump is connected to a spray pipe. The upper part of the light phase liquid zone of the last separation and recovery tank is provided with a 2-octanol recovery port.

[0007] Furthermore, the gas adsorption assembly comprises multiple interconnected activated carbon adsorption boxes, and a detection sensor is provided at the exhaust port of the gas adsorption assembly.

[0008] Furthermore, the spray tower is a stainless steel cylinder with a diameter of 1.8m, and the side wall of the spray tower is provided with multiple inspection ports.

[0009] Furthermore, there are two stainless steel corrugated packings, which are respectively installed on the upper and lower sides of the spray pipe, and the thickness of the upper stainless steel corrugated packing is less than that of the lower stainless steel corrugated packing.

[0010] Furthermore, the diameter of the small hole on the outer surface of the exhaust gas inlet pipe is 1 mm.

[0011] Furthermore, the separation and recycling box has a stainless steel body and a tempered glass top plate.

[0012] Furthermore, the height of the single-edged blade baffle is higher than the height of the 2-octanol recovery port, and the single-edged blade baffle is a stainless steel plate with the same width as the partition, with a 40-50° bevel at the top.

[0013] Furthermore, a valve is provided on the pipeline connecting the circulating water pump to the drain outlet of the separation and recovery tank, and the circulating water pump is also provided with a water replenishment inlet.

[0014] This invention has the following beneficial effects: The sebacic acid tail gas recovery device containing 2-octanol utilizes the physical property that 2-octanol is sparingly soluble in water at room temperature. The tail gas containing 2-octanol is sent to a spray tower for countercurrent spray washing and cooling, and then discharged into a separation and recovery tank for settling. The condensed 2-octanol and water are separated and recovered by single-edged blade liquid phase separation technology through three single-edged blade liquid phase separation processes, saving production costs. At the same time, an activated carbon adsorption box is installed at the exhaust port at the top of the spray tower to ensure that the gas emitted into the atmosphere meets the green emission target of environmental protection requirements, thus achieving energy conservation and environmental protection. Attached Figure Description

[0015] Figure 1 A schematic diagram of the device for recovering sebacic acid tail gas containing 2-octanol according to this utility model. Detailed Implementation

[0016] To clearly illustrate the technical features of this solution, specific embodiments are described below in conjunction with the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figure 1 As shown, a device for recovering sebacic acid tail gas containing 2-octanol includes a spray tower 1, a separation and recovery box, and a gas adsorption component.

[0019] The spray tower is a stainless steel cylinder with a diameter of 1.8m. Multiple inspection ports 7 are provided on the side wall of the spray tower 1. A gas exhaust port 2 is located at the top of the spray tower 1, and the gas exhaust port 2 is connected to a gas adsorption assembly. The gas adsorption assembly consists of multiple interconnected activated carbon adsorption boxes 15. A detection sensor is installed at the exhaust port of the gas adsorption assembly to ensure that the discharged gas meets environmental standards.

[0020] The spray tower 1 is equipped with a spray pipe 5 at its upper part. Several nozzles are evenly arranged at the lower end of the pipe wall of the spray pipe 5 to spray water mist. The spray tower 1 is equipped with multiple stainless steel corrugated packings 6 at intervals. In this embodiment, there are two stainless steel corrugated packings 6, which are respectively arranged on the upper and lower sides of the spray pipe 5. The thickness of the upper stainless steel corrugated packing 6 is smaller than that of the lower stainless steel corrugated packing 6.

[0021] The lower part of the spray tower is equipped with an exhaust gas inlet pipe 3 and a liquid recovery pipe 4. One end of the exhaust gas inlet pipe 3 is the inlet for the tail gas containing 2-octanol, and the other end passes through the side wall of the spray tower 1 and extends into the interior. The part of the exhaust gas inlet pipe 3 located inside the spray tower has small holes evenly distributed on its outer surface, with a diameter of 1mm. The liquid recovery pipe 4 is set below the exhaust gas inlet pipe 3. Multiple interconnected separation and recovery boxes 8 are set at the lower end of the liquid recovery pipe 4. The upper parts of adjacent separation and recovery boxes 8 are connected. The bottom of the first separation and recovery box 8 is equipped with a drain outlet 11, which is connected to the inlet of the circulating water pump 13. A valve is installed on the pipeline connecting the drain outlet 11 and the circulating water pump 13. The circulating water pump 13 is also equipped with a supplementary water inlet 14 to replenish an appropriate amount of water to the spray pipe 5 at regular intervals. The outlet of the circulating water pump 13 is connected to the spray pipe 5. The upper light phase liquid zone of the last separation and recovery box 8 is equipped with a 2-octanol recovery port 12, which is connected to the 2-octanol storage tank.

[0022] In this embodiment, two separation and recovery boxes 8 are provided. Each separation and recovery box 8 has a stainless steel body with a tempered glass top plate. The first box contains two partitions 10, and the last box contains one partition 10. Each partition 10 includes a vertically connected section and a horizontal section, dividing the box into a light phase liquid zone and a heavy phase liquid zone. A single-edged blade baffle 9 is provided on the horizontal section of the partition 10. The height of the single-edged blade baffle 9 is higher than the height of the 2-octanol recovery port 12. The single-edged blade baffle 9 is a stainless steel plate with the same width as the partition, and its top edge is a 40-50° bevel. There is a gap between the upper end of the single-edged blade baffle 9 and the top plate of the separation and recovery box 8, allowing communication between the upper space of the separation and recovery box 8. Since 2-octanol is poorly soluble in water and has a density of 0.835 g / cm³... 3 (20℃) It will float on the top of the liquid and be gradually separated by three single-edged blade baffles 9 to achieve the purpose of purification.

[0023] All other parts of this utility model that are not described in detail belong to the prior art, and therefore will not be described in detail here.

[0024] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A device for recovering sebacic acid tail gas containing 2-octanol, characterized in that, Includes spray tower, separation and recovery box, and gas adsorption assembly. The spray tower has a gas outlet at the top, which is connected to the gas adsorption component. A spray pipe is located on the upper part of the main body of the spray tower. Multiple stainless steel corrugated packing materials are spaced apart inside the spray tower. An exhaust gas inlet pipe and a liquid recovery pipe are located at the bottom of the spray tower. One end of the exhaust gas inlet pipe is an inlet for tail gas containing 2-octanol, and the other end passes through the side wall of the spray tower and extends into the interior. Small holes are evenly distributed on the outer surface of the portion of the exhaust gas inlet pipe located inside the spray tower. The liquid recovery pipe is positioned below the exhaust gas inlet pipe, and multiple interconnected separation and recovery boxes are located at the lower end of the liquid recovery pipe. The separation and recovery tank has a top plate at the top and multiple partitions inside. The partitions include vertical and horizontal sections connected at the top and bottom, dividing the tank into a light phase liquid zone and a heavy phase liquid zone. A single-edged blade baffle is provided on the horizontal section of the partition. The upper part of the single-edged blade baffle has a gap with the top plate of the separation and recovery tank. The upper parts of adjacent separation and recovery tanks are connected. The bottom of the first separation and recovery tank is provided with a drain outlet, which is connected to a circulating water pump. The circulating water pump is connected to a spray pipe. The upper part of the light phase liquid zone of the last separation and recovery tank is provided with a 2-octanol recovery port.

2. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The gas adsorption assembly consists of multiple interconnected activated carbon adsorption boxes, and a detection sensor is installed at the exhaust port of the gas adsorption assembly.

3. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The spray tower is a stainless steel cylinder with a diameter of 1.8m, and the side wall of the spray tower is provided with multiple inspection ports.

4. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, Two stainless steel corrugated packing materials are provided, one on the upper side and the other on the lower side of the spray pipe. The thickness of the upper stainless steel corrugated packing material is less than that of the lower stainless steel corrugated packing material.

5. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The diameter of the small hole on the outer surface of the exhaust gas inlet pipe is 1 mm.

6. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The separation and recycling box has a stainless steel body and a tempered glass top plate.

7. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The height of the single-edged blade baffle is higher than the height of the 2-octanol recovery port. The single-edged blade baffle is a stainless steel plate with the same width as the partition, and the top edge is a 40-50° bevel.

8. The device for recovering sebacic acid tail gas containing 2-octyl alcohol according to claim 1, characterized in that, The pipeline connecting the circulating water pump to the drain outlet of the separation and recovery tank is equipped with a valve, and the circulating water pump is also equipped with a water replenishment inlet.

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