Corrosion inhibitor preparation tank with pre-mixing structure

Abstract

The utility model relates to a kind of corrosion inhibitor preparation tank with front premix structure, including cauldron main part, the bottom of cauldron main part is provided with support foot column, the top of cauldron main part is buckled with the tank cover that the closed cavity is formed with it cooperation, input pipe mouth that can be communicated with the inner cavity of cauldron main part and each parallel is inserted and installed on the tank cover, wherein, the input end of the first feeding pipe mouth of input pipe mouth is connected with the amine aldehyde premix component that can mix amine solution and aldehyde solution in advance by the inclined mixing delivery pipe that can continuously change amine aldehyde mixed solution state;Stirring component and waste gas discharge module that can be inserted into cauldron main part and carry out material agitation are also provided on the tank cover.The utility model can form the high degree of homogenization of imine intermediate solution by amine solution and aldehyde solution being mixed fully and evenly in advance and improve preparation efficiency and product purity.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary structure technology for corrosion inhibitor preparation, and in particular to a corrosion inhibitor preparation tank with a premixing structure. Background Technology

[0002] In recent years, the quality of crude oil resources has continued to deteriorate, characterized by increased heavy and inferior quality, with rising acidity, sulfur, and salt content. Especially with the increasing proportion of imported high-acid crude oil, corrosion problems in refinery equipment have become increasingly prominent. Atmospheric distillation tower top circulation systems and condensation units have suffered severe damage, threatening not only the long-term safe operation of the units but also significantly impacting enterprise profitability. While crude oil has a complex composition, with hydrocarbons dominating, trace amounts of sulfur, oxygen, nitrogen, chlorine, and organic-inorganic compounds formed by metal elements (such as inorganic salts, sulfides, and naphthenic acids), though present in low quantities, have become the core cause of corrosion in distillation units. To address this challenge, process corrosion prevention strategies are widely applied. Among these, the addition of neutralizing corrosion inhibitors (such as long-chain amides, pyridines, imidazoline derivatives, quaternary ammonium salts, or Mannich bases) is favored due to its ease of operation, high efficiency, and economy. These compounds adsorb onto metal surfaces through strong coordination or non-covalent interactions, forming a hydrophobic barrier to mitigate corrosion.

[0003] With the rapid growth of energy demand in the economy, the use of tertiary oil recovery technology to increase production has become widespread, leading to increasingly poor crude oil properties and a growing proportion of low-quality crude oil with high salt and acid content. Consequently, the demand for corrosion inhibitors in related petrochemical processing systems is also increasing, forcing corrosion inhibitor production equipment to be more efficient in its production. Existing reactors for corrosion inhibitor preparation require the step-by-step addition of multiple materials, coupled with continuous stirring to ensure uniform mixing and sufficient reaction. However, the heating and mixing of materials occur simultaneously, especially since the mixing of amine and aldehyde is an exothermic process. This easily leads to incompletely mixed amine-aldehyde solutions undergoing localized side reactions with other materials at high temperatures, reducing the purity of the subsequent condensation into Mannich bases. Furthermore, the reaction induction period during the mixing of amine and aldehyde solutions prolongs the reaction time within the reactor, easily causing localized reaction delays when adding materials in stages, thus affecting processing efficiency. Therefore, there is a need for a preparation device that can premix amines and aldehydes to form an imine intermediate and accelerate subsequent reaction rates, thereby improving preparation efficiency and quality. Utility Model Content

[0004] The purpose of this invention is to provide a corrosion inhibitor preparation tank with a pre-mixing structure that can form a highly homogenized imine intermediate solution in advance by fully and uniformly mixing amine and aldehyde solutions, thereby improving preparation efficiency and product purity. This solves the problems of reaction lag and side reactions that easily occur due to insufficient and uneven mixing of amine and aldehyde solutions before reacting with other materials, resulting in the formation of non-target products and reducing the purity and quality of corrosion inhibitor preparation.

[0005] The technical solution adopted by this utility model is as follows: a corrosion inhibitor preparation tank with a pre-mixing structure, including a tank body, a support column at the bottom of the tank body, a tank cover that fits with the tank body to form a sealed chamber, an input port that can communicate with and is connected in parallel with the inner cavity of the tank body is inserted into the tank cover, wherein the input end of the first feeding port of the input port is connected to an amine-aldehyde premixing component that can premix amine solution and aldehyde solution through an inclined mixing conveying pipe that can continuously change the state of the amine-aldehyde mixture; a stirring component that can extend into the tank body to agitate the material and an exhaust gas emission module are also provided on the tank cover.

[0006] According to a preferred embodiment, the amine-aldehyde premixing assembly includes a drip premixing tank shell, a first raw material tank, and a second raw material tank. The first raw material tank is connected to an inlet pipe on the side of the drip premixing tank shell. The second raw material tank is positioned on the top surface of the drip premixing tank shell with its drip pipes arranged in an array on its bottom surface inserted into the shell. The side of the drip premixing tank shell away from the first raw material tank is connected to the inclined mixing and conveying pipe via an outlet pipe.

[0007] According to a preferred embodiment, a diversion triangular prism corresponding to the drip head is arranged in a staggered array inside the shell of the drip premixing tank. The upper and lower axial ends of the diversion triangular prism are respectively connected to the top and bottom walls of the shell of the drip premixing tank.

[0008] According to a preferred embodiment, the top of the second raw material liquid tank is provided with a second injection port for convenient input of pre-configured diluent, and a second sealing cap is detachably threaded onto the second injection port. A connecting air pipe communicating with the inner cavity of the second raw material liquid tank is also provided on one side of the second injection port, and an air valve is provided in the connecting air pipe.

[0009] According to a preferred embodiment, the inclined mixing and conveying pipe includes a mixing guide pipe, an inclined inlet pipe, and an inclined outlet pipe, wherein the input end and the output end of the mixing guide pipe are respectively connected to the inclined inlet pipe and the inclined outlet pipe; the input end of the inclined inlet pipe is connected to the liquid outlet pipe head; and the output end of the inclined outlet pipe is connected to the input end of the first feeding pipe port of the input pipe port.

[0010] According to a preferred embodiment, the connecting pipe and the expansion pipe of the mixing guide pipe are connected in series in an alternating manner, and a flow-dividing insert capable of forming a flow-dividing island is inserted into the cavity of the expansion pipe. A turbulence turbine is also provided in the connecting pipe between two adjacent expansion pipes.

[0011] According to a preferred embodiment, the stirring assembly includes a stirring motor mounted on the tank cover, a stirring shaft that is drivenly connected to the stirring motor and extends into the main body of the tank, and stirring blades that are circumferentially spaced on the stirring shaft.

[0012] The beneficial effects of this utility model are: The amine-aldehyde premixing component described in this application can premix the amine solution in a thin-layer flowing aldehyde solution through multi-stage droplet mixing, thereby effectively achieving amine and aldehyde premixing. The resulting mixed liquid flow undergoes continuous flow state changes in the inclined mixing delivery pipe, allowing the solute molecules to undergo continuous relative movement in the solvent. This enables the two solutes to gradually and uniformly mix in the solvent, improving the uniformity of premixing, enabling the early acquisition of the imine intermediate, reducing potential side reactions during the condensation into Mannich base in the reactor body, and improving the purity of the preparation. Furthermore, premixing can effectively shorten the reaction induction period, avoiding the reaction lag problem caused by stepwise addition in the reactor body, thus improving the preparation efficiency and increasing the condensation rate by more than 30%. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a preferred corrosion inhibitor preparation tank with a premixing structure proposed in this utility model; Figure 2 This is a cross-sectional schematic diagram of the shell of a preferred corrosion inhibitor preparation tank with a pre-mixing structure proposed in this utility model; Figure 3 This is an axial cross-sectional view of the mixing guide pipe of a preferred corrosion inhibitor preparation tank with a pre-mixing structure proposed in this utility model. Detailed Implementation

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] The technical solutions provided by this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the descriptions of these embodiments are for the purpose of helping to understand this utility model, but do not constitute a limitation thereof. In some examples, because some implementation methods belong to existing or conventional technology, they are not described or are not described in detail. The serial numbers assigned to components in this document, such as "first," "second," etc., are only used to distinguish the described objects and do not have any sequential or technical meaning.

[0016] The following is a detailed explanation with reference to the accompanying drawings. Example

[0017] This application provides a corrosion inhibitor preparation tank with a premixing structure, which includes a tank body 1, supporting columns 2, a tank cover 3, an inlet 4, an amine-aldehyde premixing component 5, an inclined mixing and conveying pipe 6, a stirring component 7, and an exhaust gas emission module 8.

[0018] according to Figure 1-3In one specific embodiment, the vessel body 1 forms a corrosion-resistant cavity structure capable of accommodating and mixing multiple raw materials. Supporting legs 2 are provided at the bottom of the vessel body 1. A lid 3, forming a sealed cavity, is fitted onto the top of the vessel body 1. An input port 4, communicating with and connected in parallel to the inner cavity of the vessel body 1, is inserted into the lid 3. The input end of the first feeding port 41 of the input port 4 is connected to an amine-aldehyde premixing assembly 5, capable of premixing amine and aldehyde solutions, via an inclined mixing conveying pipe 6 that continuously changes the state of the amine-aldehyde mixture. A stirring assembly 7, capable of extending into the vessel body 1 to agitate materials, and an exhaust gas emission module 8 are also provided on the lid 3. The amine-aldehyde premixing component 5 provided in this application can premix the amine solution in a thin-layer flowing aldehyde solution through multi-stage droplet mixing, thereby effectively achieving amine and aldehyde premixing. The resulting mixed liquid flow can undergo continuous flow state changes in the inclined mixing delivery pipe 6, and the solute molecules of the two can undergo continuous relative movement in the solvent, so that the two solutes can be gradually and uniformly mixed in the solvent, improving the uniformity of premixing, realizing the early acquisition of imine intermediates, reducing the side reactions that may occur when the main body 1 of the reactor condenses into Mannich base, and improving the purity of preparation. Furthermore, premixing can effectively shorten the reaction induction period, avoid the reaction lag problem caused by stepwise addition in the main body 1 of the reactor, improve the preparation efficiency, and increase the condensation rate by more than 30%.

[0019] Preferably, the bottom side of the vessel body 1 is provided with multiple circumferentially spaced support columns 2 by welding, so that it can be stably suspended and supported. Preferably, sealing auxiliary components such as sealing gaskets are embedded between the mating ring surfaces of the lid 3 and the vessel body 1, so that when the lid 3 is installed on the vessel body 1 by countersunk screws or other limiting devices, the two can cooperate to form a sealed cavity, ensuring that the corrosion inhibitor can be isolated from the outside environment during the preparation process, avoiding problems such as waste gas leakage, and improving the environmental protection and safety of the preparation. Preferably, a discharge port for convenient discharge of the prepared corrosion inhibitor is also inserted at the center of the bottom surface of the vessel body 1.

[0020] Preferably, the inlet 4 includes a first feed inlet 41 for feeding the amine-aldehyde mixture and a second feed inlet 42 for convenient addition of other aqueous solvents, catalysts, pH adjusters, functional additives, and auxiliary additives. More preferably, the first feed inlet 41 and the second feed inlet 42 are fixedly inserted into the tank cover 3 by welding or other means. More preferably, the second feed inlet 42 has two on / off valves spaced apart on its tube body to form an intermediate compartment, thereby facilitating the addition of auxiliary materials during the intermediate stage of the reaction under a sealed and isolated state, and preventing the escape of waste gas during the feeding process.

[0021] Preferably, the amine-aldehyde premixing assembly 5 includes a drip premixing tank shell 51, a first raw material tank 52, and a second raw material tank 53. Preferably, the first raw material tank 52 is connected to the inlet pipe head 511 on the side of the drip premixing tank shell 51. Preferably, the second raw material tank 53 is positioned on the top surface of the drip premixing tank shell 51 by inserting the drip pipe heads 531 arranged in an array on its bottom surface. Preferably, the side of the drip premixing tank shell 51 away from the first raw material tank 52 is connected to the inclined mixing conveying pipe 6 via an outlet pipe head 512, so that the liquid flow after drip mixing can continuously change its flow state in the inclined mixing conveying pipe 6 through multiple separations and reunifications, thereby achieving uniform mixing of the amine solution and the aldehyde solution during the conveying process. Preferably, the first raw material tank 52 is pre-filled with aldehyde solution. Preferably, the second raw material tank 53 is pre-filled with amine solution. For example, the first raw material tank 52 and the second raw material tank 53 are respectively filled with 10% formaldehyde ethanol solution and 25% ethylenediamine aqueous solution, and the liquid volume ratio of the two is 2:1. Thus, when the aldehyde solution flows flat over the bottom surface of the premixing tank shell 51, the amine solution falling from above is mixed in a multi-stage dripping manner.

[0022] Preferably, a diversion triangular prism 513 corresponding to the drip head 531 is arranged in a staggered array inside the shell of the drip premixing tank 51. Preferably, the upper and lower axial ends of the diversion triangular prism 513 are respectively connected to the top and bottom walls of the shell of the drip premixing tank 51.

[0023] Preferably, the top of the first raw material tank 52 is provided with a first injection port for easy input of a pre-configured dilution solution. A first cover is provided on the first injection port. Preferably, the bottom of the first raw material tank 52 is provided with a first drain port, and the first drain port is sealed to the inlet pipe head 511 via a flange structure.

[0024] Preferably, the top of the second raw material tank 53 is provided with a second injection port 532 for convenient input of pre-configured diluent. More preferably, a second sealing cap 533 is detachably threaded onto the second injection port 532. Preferably, a connecting air pipe 534 communicating with the inner cavity of the second raw material tank 53 is also provided on one side of the second injection port 532. More preferably, an air valve 535 is provided in the connecting air pipe 534, which allows the operator to manually adjust the opening and closing of its cavity. Preferably, when the air valve 535 is opened, the air pressure inside and outside the second raw material tank 53 is balanced at atmospheric pressure. Under the action of gravity, the liquid overcomes surface tension and viscous resistance and is discharged from the bottom small hole in the form of dripping liquid. This process conforms to Torricelli's law. When the gas valve 535 is closed, the second raw material tank 53 forms a sealed space. As the liquid flows out, the internal air pressure decreases, and the external atmospheric pressure squeezes the liquid in the opposite direction through the small-hole tube. When the internal and external pressure difference is balanced with the surface tension of the liquid, the dripping stops. At this time, the small-hole tube cannot release air, creating a pressure lock-in effect. More preferably, the gas valve 535 provided in this application is manually opened by the operator at the beginning of solution preparation, and it is directly set with a single open / close position, eliminating the need for adjusting the amount of gas introduced.

[0025] Preferably, the lower end of the drip head 531 has a diameter of 1 mm to effectively prevent continuous drainage due to the siphon effect after the air valve is closed. More preferably, a miniature one-way valve is installed inside the drip head 531 to prevent backflow of the medicine. The miniature one-way valve automatically opens when the liquid is discharged and quickly closes under the action of a spring or liquid pressure difference when drainage stops, effectively blocking the backflow path. Combined with the manual control of the air valve 535 and the structural design of the drip head 531, this ensures that the second raw material tank 53 remains sealed when not in operation, preventing evaporation, contamination, and pressure imbalance. This design is particularly suitable for high-precision liquid preparation scenarios, ensuring consistency of the amount dispensed each time and operational safety.

[0026] Preferably, the drip tube head 531 is inserted into the bottom surface of the second raw material liquid tank 53 by welding or other sealing assembly methods to ensure tight insertion and prevent leakage when the air valve is closed.

[0027] The lower end diameter of the dropper head 531 in this application is 1mm, which is within the common diameter range of conventional small-hole heads. It balances flowability and anti-clogging properties, making it suitable for most reaction liquids such as organic solvents and dilute acids. It avoids the problem of complete flow obstruction due to excessive surface tension caused by an excessively small diameter, and also avoids the problem of continuous leakage due to siphoning or poor sealing caused by an excessively large diameter.

[0028] More preferably, the drip head 531 provided in this application adopts a conical head with a large inlet and a small outlet to reduce the risk of retention, and the length-to-diameter ratio of the drip head 531 is greater than 50 to ensure that the liquid filling the drip head 531 can effectively overcome surface tension and viscous resistance under the action of gravity, thereby stabilizing the dripping rate when the air valve 535 is opened.

[0029] Preferably, to ensure corrosion resistance when in contact with acid / alkali liquids, the body of the second raw material liquid tank 53, the drip head 531, and the second injection port 532 provided in this application are made of 316L stainless steel. More preferably, the second sealing cover 533, the connecting air pipe 534, and the air valve 535 can be made of polytetrafluoroethylene (PTFE) or 316L stainless steel.

[0030] Preferably, the inclined mixing and conveying pipe 6 includes a mixing guide pipe 61, an inclined inlet pipe 62, and an inclined outlet pipe 63. Preferably, the inlet and outlet ends of the mixing guide pipe 61 are sealed to the inclined inlet pipe 62 and the inclined outlet pipe 63 respectively via flange structures, so that the mixing guide pipe 61 forms an inclined mixing and conveying pipeline between the amine-aldehyde premixing component 5 and the vessel body 1, which have a height difference in the layout position. Preferably, the inlet end of the inclined inlet pipe 62 is connected to the liquid outlet head 512 via a flange structure. Preferably, the outlet end of the inclined outlet pipe 63 is connected to the inlet end of the first feeding port 41 of the inlet pipe 4 via a flange structure. Preferably, the connecting pipe 611 and the expansion pipe 612 of the mixing guide pipe 61 are connected in series in an alternating manner, and a flow-dividing strip 613 capable of forming a flow-dividing island is inserted in the cavity of the expansion pipe 612. The flow-dividing strip 613 forces the amine-aldehyde mixture flowing into the expansion pipe 612 to separate and merge, continuously changing the flow state of the liquid to accelerate the mixing of amine and aldehyde. Preferably, a turbulence turbine 614 is also provided in the connecting pipe 611 located between two adjacent expansion pipes 612. The turbulence turbine 614 rotates under the impact of the airflow, continuously cutting through the liquid flow to accelerate the relative movement between material molecules in the liquid flow, thereby accelerating the mixing of amine and aldehyde and improving the mixing uniformity.

[0031] Preferably, the stirring assembly 7 includes a stirring motor 71 mounted on the tank cover 3, a stirring shaft 72 connected to the stirring motor 71 and extending into the vessel body 1, and stirring blades 73 arranged circumferentially on the stirring shaft 72. Preferably, the stirring motor 71 can be an ANJ / LPD-35 type stirring drive motor, which forms a closed electrical circuit with the power supply through a cable with a switch, and the operator controls its movement by manually closing the switch. Preferably, the vessel body 1 and the stirring assembly 7 of this application can directly adopt the relevant content disclosed in the prior art with publication number CN210079521U. The structures of the vessel body 1 and the stirring assembly 7 are all existing conventional designs. This application adds a premix structure to the existing technology to improve the fullness and uniformity of material mixing. Therefore, this part is a direct use of the prior art.

[0032] Preferably, the exhaust gas emission module 8 can treat and directionally discharge the exhaust gas generated during the preparation of the corrosion inhibitor, thereby improving the environmental protection and safety of the exhaust gas discharge. Preferably, the exhaust gas emission module 8 can directly adopt the exhaust gas emission device disclosed in the prior art with publication number CN210079521U, which is prior art and will not be described in detail in this application.

[0033] Preferably, the electrical components such as the stirring motor 71 and the air pump of the exhaust gas emission module 8 involved in this application are all electrically connected to the controller and the power supply. The control method of this application is controlled by the controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, this utility model is only used to protect the mechanical device and its mechanical structural features. Therefore, this utility model will not explain the control method and circuit connection in detail.

[0034] For surface connections between components not explicitly specified in this application, conventional bolt connections, snap-fit ​​connections, or fixed connections such as welding can be used. As these are conventional connection methods, this application will not elaborate further on this part. Specifically, the connecting ends of the assembled components all form flange structures, and the two flange structures are connected by bolts, gaskets, or other structures.

[0035] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A corrosion inhibitor preparation tank with a pre-mixing structure, comprising a tank body (1), wherein the bottom of the tank body (1) is provided with supporting columns (2), characterized in that, The top of the vessel body (1) is fitted with a lid (3) that forms a sealed cavity with it. An inlet (4) is inserted into the lid (3) and communicates with and is connected in parallel to the inner cavity of the vessel body (1). The input end of the first feed port (41) of the input port (4) is connected to the amine-aldehyde premixing component (5) that can premix the amine solution and the aldehyde solution through the inclined mixing and conveying pipe (6) that can continuously change the state of the amine-aldehyde mixture. The can lid (3) is also provided with a stirring assembly (7) that can extend into the main body (1) of the vessel to stir the material and an exhaust gas emission module (8).

2. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 1, characterized in that, The amine-aldehyde premixing assembly (5) includes a drop-in premixing tank shell (51), a first raw material liquid tank (52), and a second raw material liquid tank (53), wherein, The first raw material liquid tank (52) is connected to the liquid inlet pipe (511) on the side of the drip premixing tank shell (51). The second raw material liquid tank (53) is placed on the top surface of the dropping premixing tank shell (51) by inserting the dropping tube heads (531) arranged in an array on its bottom surface. The side of the premixing tank shell (51) away from the first raw material tank (52) is connected to the inclined mixing and conveying pipe (6) through the liquid outlet pipe head (512).

3. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 2, characterized in that, Inside the casing of the premixing tank (51), a diversion triangular column (513) corresponding to the dropper head (531) is arranged in a staggered array. The upper and lower axial ends of the diversion triangular prism (513) are respectively connected to the top and bottom walls of the shell of the drip premixing box (51).

4. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 3, characterized in that, The top of the second raw material tank (53) is provided with a second injection port (532) for easy input of pre-configured dilution liquid, and a second sealing cap (533) is detachably threaded onto the second injection port (532). A connecting air pipe (534) is provided on one side of the second injection port (532) to communicate with the inner cavity of the second raw material liquid tank (53), and an air valve (535) is provided in the connecting air pipe (534).

5. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 4, characterized in that, The inclined mixing and conveying pipe (6) includes a mixing guide pipe (61), an inclined inlet pipe (62), and an inclined outlet pipe (63), wherein, The input end and output end of the mixing guide pipe (61) are respectively connected to the inclined inlet pipe (62) and the inclined outlet pipe (63); The input end of the oblique inlet pipe (62) is connected to the liquid outlet pipe head (512); The output end of the oblique outlet pipe (63) is connected to the input end of the first feeding port (41) of the input port (4).

6. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 5, characterized in that, The connecting pipe (611) and the expansion pipe (612) of the mixing guide pipe (61) are connected in series in an alternating manner, and a diversion strip (613) capable of forming a diversion island is inserted in the cavity of the expansion pipe (612). A turbulence turbine (614) is also provided in the connecting pipe (611) located between two adjacent expansion pipes (612).

7. The corrosion inhibitor preparation tank with a pre-mixing structure as described in claim 6, characterized in that, The stirring assembly (7) includes a stirring motor (71) mounted on the tank cover (3), a stirring shaft (72) that is connected to the stirring motor (71) and extends into the main body (1) of the tank, and stirring blades (73) that are arranged circumferentially on the stirring shaft (72).

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