A device for recovering secondary octyl alcohol in sebacic acid production

Abstract

This invention provides a 2-octanol recovery device for sebacic acid production, comprising a cracking reaction assembly, a high-level water tank, and a condensation recovery assembly. The cracking reaction assembly includes a cracking reactor and a feed tank. A gas emission pipe is located at the top of the cracking reactor, and the bottom of the reactor is connected to the feed tank via a discharge port. The condensation recovery assembly includes a condenser, a tail gas absorption tower, and a 2-octanol separation tank. A condensate inlet is located on one side of the condenser, and a water outlet is located at the top of the condenser. The water outlet is connected to the feed tank via a pipeline and also to a decolorization workshop via a pipeline. A water inlet and a condensate outlet are located at the bottom of the condenser. The water inlet is connected to the high-level water tank via a pipeline, and the condensate outlet is connected to the 2-octanol separation tank via a pipeline. This invention not only effectively recovers 2-octanol from high-temperature gas through the condenser but also converts the heat energy in the high-temperature gas into hot water for use in the next stage of production, thus achieving energy saving and consumption reduction.

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 2-octanol in sebacic acid production. Background Technology

[0002] The second stage in the production of sebacic acid involves the reaction of ricinoleic acid with sodium hydroxide solution, followed by a high-temperature cracking reaction in the presence of phenol as a flux to produce the disodium salt of sebacic acid. The resulting 2-octanol possesses all the chemical properties of secondary alcohols; upon oxidation, it forms an aldehyde, which in turn forms an acid. Dehydration produces an olefin, and reaction with acids forms esters. Therefore, it has high recycling value and can be used to produce plasticizers, emulsifiers, solvents, and raw materials for organic synthesis. Chinese utility model patent application 2024231482071 discloses a device for recovering sebacic acid tail gas containing 2-octanol, including a spray tower, separation and recovery tanks, and a gas adsorption component. The spray tower has a gas outlet at the top, connected to the gas adsorption component. A spray pipe is located on the upper part of the spray tower body, and multiple stainless steel corrugated packing materials are spaced apart inside the spray tower. A waste gas inlet pipe and a liquid recovery pipe are located at the lower part of the spray tower. Multiple interconnected separation and recovery tanks are located at the lower end of the liquid recovery pipe, with adjacent separation and recovery tanks connected at the top. A drain outlet is located at the bottom of the first separation and recovery tank, connected to a circulating water pump, which is connected to the spray pipe. A 2-octanol recovery port is located in the light phase liquid zone at the upper part of the last separation and recovery tank. However, the 2-octanol-containing gas discharged from the cracking reactor is at a very high temperature, and a large amount of heat energy is present during the recovery process. The above-mentioned device cannot recover and utilize this heat energy, resulting in energy waste. Summary of the Invention

[0003] The technical problem solved by this invention is that existing 2-octanol recovery devices cannot recover heat energy, resulting in energy waste.

[0004] This utility model provides a 2-octanol recovery device in sebacic acid production, including a cracking reaction assembly, a high-level water tank, and a condensation recovery assembly. The cracking reaction assembly includes a cracking kettle and a feed tank. A gas emission pipe is provided at the top of the cracking kettle, and the bottom of the cracking kettle is connected to the feed tank via a discharge port. The condensation recovery assembly includes a condenser, a tail gas absorption tower, and a 2-octanol separation tank. A condensate inlet is provided on one side of the condenser for connection to the gas emission pipe. A water outlet is provided at the upper end of the condenser, which is connected to the feed tank via a pipe and also connected to the decolorization workshop via a pipe. A water inlet and a condensate outlet are provided at the lower end of the condenser. The water inlet is connected to the high-level water tank via a pipe, and the condensate outlet is connected to the 2-octanol separation tank via a pipe. The 2-octanol separation tank is connected to the 2-octanol recovery tank, and the condensate outlet is also connected to the tail gas absorption tower via a pipe.

[0005] The elevated water tank is equipped with a first inlet pipe and a second inlet pipe. The water source in the first inlet pipe is the wastewater generated by the production system, which has been treated by biochemical processes and meets the discharge standards. This serves as the main water source for the elevated water tank. The water source in the second inlet pipe is tap water, which is used to replenish the water level when the water level in the elevated water tank is too low.

[0006] The exhaust gas absorption tower is equipped with an exhaust pipe at the top, and an automatic exhaust valve is installed on the exhaust pipe to discharge the purified hydrogen into the upper atmosphere.

[0007] The gas in the gas discharge pipe is a mixture of 2-octanol and hydrogen produced in the cracking reactor, and the temperature of the mixture is greater than or equal to 250°C.

[0008] The condenser is provided in two sets, which are connected in series.

[0009] The water temperature discharged from the condenser outlet is 75-85℃.

[0010] This invention has the following beneficial effects: The sebacic acid production 2-octanol recovery device of this invention uses two sets of condensers to condense and recover the high-temperature 2-octanol gas generated in the cracking reaction during the sebacic acid production process. It can not only effectively recover the 2-octanol in the waste gas, but also convert the heat energy in the high-temperature gas into hot water, which can be used for the "material processing" of sebacic acid disodium salt in the next stage of production, as well as the resin regeneration and cleaning process in the decolorization workshop, thereby playing a role in energy saving and consumption reduction. Attached Figure Description

[0011] Figure 1 A schematic diagram of the 2-octanol recovery device in the production of sebacic acid according to this utility model. Detailed Implementation

[0012] 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.

[0013] 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.

[0014] like Figure 1 As shown, a sebacic acid production octanol recovery unit includes a cracking reaction component, a high-level water tank 1, and a condensation recovery component.

[0015] The cracking reaction assembly includes a cracking reactor 3 and a feed tank 5. The top of the cracking reactor 3 is equipped with an exhaust pipe, through which a mixture of 2-octanol and hydrogen produced within the cracking reactor is discharged. The temperature of this mixture is greater than or equal to 250°C. The bottom of the cracking reactor 3 is connected to the feed tank 5 via a discharge port. After treatment in the feed tank 5, the disodium sebacic acid-containing feed solution is discharged into the homogenization tank of the production system. Once the homogenized feed solution reaches an appropriate Baume degree, it is sent to the neutralization workshop.

[0016] The elevated water tank 1 is used to input cold water into the condenser 2 to condense and recover the 2-octanol vapor discharged from the cracking reactor 3. The elevated water tank 1 is equipped with a first water inlet pipe and a second water inlet pipe. The water source in the first water inlet pipe is the wastewater generated by the production system that has been treated by biochemical processes and meets the discharge standards. This serves as the main water source for the elevated water tank 1. The water source in the second water inlet pipe is tap water, which is used to replenish the water level when the water level in the elevated water tank 1 is too low.

[0017] The condensation recovery assembly includes a condenser 2, a tail gas absorption tower 6, and a 2-octanol separation tank 4. In this embodiment, two sets of condensers 2 are connected in series. A condensate inlet is located on one side of the condenser 2 for connection to the exhaust gas pipe. A water outlet is located at the top of the condenser 2, with the water temperature at the outlet being 75-85℃. The outlet is connected via a pipe to a chemical feed tank 5 for dissolving the material lumps after the cracking reaction. The outlet is also connected via a pipe to a decolorization workshop 7 for cleaning the decolorizing resin and regenerating it. A water inlet and a condensate outlet are located at the bottom of the condenser 2. The water inlet is connected via a pipe to a high-level water tank 1, and the condensate outlet is connected via a pipe to the 2-octanol separation tank 4. After separation in the 2-octanol separation tank, the condensate is sent to the 2-octanol recovery tank 8. The condensate outlet is also connected to the tail gas absorption tower 6 via a pipeline. The tail gas absorption tower 6 is used to further absorb the small amount of 2-octanol gas remaining after condensation. The tail gas absorption tower 6 is equipped with an exhaust pipe at the top, and an automatic exhaust valve is installed on the exhaust pipe to discharge the purified hydrogen gas into the upper atmosphere.

[0018] 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.

[0019] 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 protected by this utility model.

Claims

1. A device for recovering 2-octanol in the production of sebacic acid, characterized in that, Includes cracking reaction components, elevated water tank, and condensate recovery components. The cracking reaction assembly includes a cracking reactor and a feed tank. The top of the cracking reactor is equipped with a gas exhaust pipe, and the bottom of the cracking reactor is connected to the feed tank via a discharge port. The condensation recovery assembly includes a condenser, a tail gas absorption tower, and a 2-octanol separation tank. The condenser has a condensate inlet on one side for connection to a gas emission pipe. The condenser has a water outlet at the top, which is connected to a chemical feed tank via a pipe and also connected to a decolorization workshop via a pipe. The condenser has a water inlet and a condensate outlet at the bottom. The water inlet is connected to the elevated water tank via a pipe, and the condensate outlet is connected to the 2-octanol separation tank via a pipe. The 2-octanol separation tank is connected to a 2-octanol recovery tank, and the condensate outlet is also connected to the tail gas absorption tower via a pipe.

2. The sebacic acid production 2-octanol recovery device according to claim 1, characterized in that, The elevated water tank is equipped with a first inlet pipe and a second inlet pipe. The water source in the first inlet pipe is the wastewater generated by the production system, which has been treated by biochemical processes and meets the discharge standards. This serves as the main water source for the elevated water tank. The water source in the second inlet pipe is tap water, which is used to replenish the water level when the water level in the elevated water tank is too low.

3. The sebacic acid production 2-octanol recovery device according to claim 1, characterized in that, The exhaust gas absorption tower is equipped with an exhaust pipe at the top, and an automatic exhaust valve is installed on the exhaust pipe to discharge the purified hydrogen into the upper atmosphere.

4. The sebacic acid production 2-octanol recovery device according to claim 1, characterized in that, The gas in the gas discharge pipe is a mixture of 2-octanol and hydrogen produced in the cracking reactor, and the temperature of the mixture is greater than or equal to 250°C.

5. The sebacic acid production 2-octanol recovery device according to claim 1, characterized in that, The condenser is provided in two sets, which are connected in series.

6. The sebacic acid production 2-octanol recovery device according to claim 1, characterized in that, The water temperature discharged from the condenser outlet is 75-85℃.

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