A purification apparatus and electrolyte preparation system for 2-methyl-adipic acid

Abstract

This utility model discloses a purification device and an electrolyte preparation system for 2-methyl-adipic acid. The purification device first purifies the crude electrolyte with high viscosity through a thin-film evaporator, separates the light components, and then performs distillation. This combines the advantages of high evaporation efficiency of the thin-film evaporator with the distillation effect of the distillation column, resulting in a high-purity purified product, which promotes the industrial production of high-quality aluminum electrolytic capacitor electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of electrolyte purification technology for aluminum electrolytic capacitors, specifically to a purification device for 2-methyl-adipic acid and an electrolyte preparation system. Background Technology

[0002] Aluminum electrolytic capacitors are polarized electrolytic capacitors. Their anode (+) electrode is made of etched aluminum foil, which undergoes anodizing and is surrounded by a thin layer of aluminum oxide insulation, serving as the capacitor's dielectric. Aluminum electrolytic capacitors can be classified into liquid aluminum electrolytic capacitors and solid aluminum electrolytic capacitors based on the type of electrolyte. These products are widely used in consumer electronics, communication products, computers and peripherals, instruments, automation control, the automotive industry, optoelectronic products, high-speed rail, aviation, and military equipment.

[0003] High-end low-voltage sheet aluminum capacitors still need to be imported in large quantities. Domestic electrolytes have problems such as short lifespan, leakage, and gas expansion. Ultimately, this is because the electrolytes used in capacitors are not pure. Therefore, improving the quality of domestically produced electrolytes has become an urgent problem to be solved.

[0004] Taking the adipic acid derivative electrolyte 2-methyl-adipic acid as an example, the reaction process is as follows: After the raw material 2-methylcyclohexanone reacts with Fenton's reagent in concentrated sulfuric acid and methanol solvent to obtain a mixed carboxylic acid ester, it is then saponified and acidified by washing with water to generate 2-methyl-adipic acid. However, due to the presence of a small amount of methyl 16-enoate impurities in the raw material 2-methylcyclohexanone, the reaction generates 2-methyl-docosanoic acid. Since the viscosity of 2-methyl-docosanoic acid and 2-methyl-adipic acid is relatively high after blending, it is not conducive to the purification of 2-methyl-adipic acid, affecting the purification efficiency and hindering industrial production.

[0005] Therefore, it is necessary to design a refining device to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a purification apparatus for 2-methyl-adipic acid, in order to solve the defect that the presence of high-viscosity impurities is detrimental to purification.

[0007] To achieve the above objectives, the solution of this utility model is as follows:

[0008] A purification apparatus for 2-methyl-adipic acid includes a thin-film evaporator, a distillation column, and an electrolyte receiving unit connected to a feed unit; the thin-film evaporator and the distillation column are used to obtain light components; the upper part of the thin-film evaporator is connected to the lower part of the distillation column, and the top of the distillation column is connected to the electrolyte receiving unit.

[0009] Furthermore, the thin-film evaporator and the distillation column are each equipped with light component reflux lines.

[0010] Preferably, the light component reflux line of the thin-film evaporator is equipped with a first condenser, and the light component reflux line of the distillation column is equipped with a second condenser; the medium output channel of the second condenser is connected to the medium input channel of the first condenser.

[0011] Furthermore, a second storage tank is provided between the thin-film evaporator and the distillation column, and the second storage tank is connected to the vacuum system.

[0012] Furthermore, the electrolyte receiving unit includes a storage tank three, which is connected to a vacuum system.

[0013] Furthermore, the bottom of the thin-film evaporator is connected to a storage tank.

[0014] This utility model also provides an electrolyte preparation system, including the above-described refining device and a preparation vessel; the inlet of the preparation vessel is connected to the electrolyte receiving unit.

[0015] Furthermore, the preparation vessel is equipped with an ammonia inlet pipe and an ethylene glycol inlet pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The purification device described in this invention first purifies the crude electrolyte with high viscosity using a thin-film evaporator, separates the light components, and then performs distillation. This combines the advantages of high evaporation efficiency of the thin-film evaporator with the distillation effect of the distillation column, resulting in a high-purity product and promoting the industrial production of high-purity 2-methyl-adipic acid electrolyte. Attached Figure Description

[0018] Figure 1 A schematic diagram of the purification apparatus and electrolyte preparation system for 2-methyl-adipic acid provided by this utility model.

[0019] The attached figures are labeled as follows:

[0020] C1, Condenser 1; C2, Condenser 2; E1, Reboiler; L1, Reflux Pipe 1; L2, Reflux Pipe 2; P1, Pump 1; P2, Pump 2; P3, Pump 3; R1, Preparation vessel; S1, Storage tank 1; S2, Storage tank 2; S3, Storage tank 3; S4, Storage tank 4; T1, Thin-film evaporator; T2, Distillation column; 10, Ammonia feed pipe; 20, Ethylene glycol feed pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be understood that the terms "upper", "lower", "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 simplifying the description, 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.

[0023] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] like Figure 1 As shown, in one embodiment, a purification apparatus for 2-methyl-adipic acid is provided, including a thin-film evaporator T1, a distillation column T2, and an electrolyte receiving unit connected to a crude 2-methyl-adipic acid feed unit; the thin-film evaporator T1 and the distillation column T2 are respectively used to obtain light components; the upper part of the thin-film evaporator T1 is connected to the lower part of the distillation column T2, and the top of the distillation column T2 is connected to the electrolyte receiving unit.

[0025] Because crude 2-methyl-adipic acid contains impurities such as 2-methyl-docosalicylic acid, resulting in high viscosity, high-viscosity materials experience significant mass transfer resistance during distillation. Therefore, direct distillation would negatively impact distillation efficiency. In the above embodiment, the refining apparatus first uses a thin-film evaporator to perform preliminary distillation of the high-viscosity crude electrolyte to obtain a light component containing 2-methyl-adipic acid. After obtaining the light component through distillation, further distillation is performed to remove residual high-boiling-point impurities such as 2-methyl-docosalicylic acid, yielding high-purity 2-methyl-adipic acid. This distillation apparatus combines the high evaporation efficiency of a thin-film evaporator with the effective distillation of a distillation column, resulting in high refining efficiency and high product purity.

[0026] In the above embodiments, the feeding unit includes a connected storage tank S1 and a pump for pumping crude 2-methyl-adipic acid from the storage tank S1 into the thin-film evaporator T1; the electrolyte receiving unit is a storage tank S3.

[0027] In a preferred embodiment, to improve system balance and separation efficiency, the upper part of the thin-film evaporator T1 is equipped with a reflux pipe L1, and a condenser C1 is installed on the reflux pipe L1 for condensing and refluxing light components. A bypass line connects the reflux pipe L1 to storage tank S2, which is connected to the lower part of the distillation column T2 via pump P2. The top of the distillation column T2 is equipped with a reflux pipe L2, and a condenser C2 is installed on the reflux pipe L2 for condensing and refluxing light components from the top of the column. A bypass line connects the reflux pipe L2 to storage tank S3 for storing purified 2-methyl-adipic acid; a reboiler E1 is also provided at the bottom of the distillation column T2 for reboiling the bottom material.

[0028] In the above embodiment, the thin-film evaporator T1 can be a common scraped-film evaporator, with a heating steam jacket on the outside of the shell and a rotatable scraper inside, driven by a rotating shaft at the center of the cylinder. The feed liquid is added tangentially from the top of the evaporator, and under the influence of gravity and the rotating scraper, forms a downward-swirling thin film along the inner wall of the shell. The lighter components are evaporated, forming a rising vapor stream, which is condensed in condenser C1 and then enters the distillation column T2; the heavier components are discharged from the bottom of the evaporator into the connected storage tank S4.

[0029] In a preferred embodiment, the medium output channel of condenser C2 is connected to the medium input channel of condenser C1; by connecting the refrigerants in series, energy consumption is reduced and costs are lowered.

[0030] In a preferred embodiment, to improve the thin-film evaporation efficiency, storage tanks S2 and S3 are respectively connected to a vacuum system to provide vacuum to the corresponding connected thin-film evaporator T1 and distillation column T2.

[0031] In another embodiment, an electrolyte preparation system is provided, including the purification device described above and a preparation vessel R1; the bottom of storage tank S3 is connected to the inlet of preparation vessel R1 via pump P3, and 2-methyl-adipate electrolyte is prepared by adding salt-forming reagents and solvents into preparation vessel R1.

[0032] In a preferred embodiment, the preparation vessel R1 is equipped with an ammonia inlet pipe 10 and an ethylene glycol inlet pipe 20. 2-methyl-ammonium adipate is obtained by reacting ammonia with 2-methyl-adipic acid, and ethylene glycol is used as a solvent to prepare an aluminum electrolytic capacitor electrolyte that meets the requirements.

[0033] It is understandable that the materials of the components used in the above refining equipment and electrolyte preparation system can be selected according to the requirements of the physicochemical properties of the raw materials, and commonly used instruments, meters or valves can be selected or added according to the operational requirements. All of the above are within the design scope of this solution and will not be elaborated here.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A refining apparatus for 2-methyl-hexanedioic acid, characterized by comprising: It includes a thin-film evaporator (T1), a distillation column (T2), and an electrolyte receiving unit connected to a feed unit; the thin-film evaporator (T1) and the distillation column (T2) are used to obtain light components; the upper part of the thin-film evaporator (T1) is connected to the lower part of the distillation column (T2), and the top of the distillation column (T2) is connected to the electrolyte receiving unit.

2. The finishing apparatus according to claim 1, characterized by The thin-film evaporator (T1) and the distillation column (T2) are each equipped with light component reflux lines.

3. The finishing apparatus according to claim 2, characterized in that, The light component reflux line of the thin film evaporator (T1) is equipped with condenser one (C1), and the light component reflux line of the distillation column (T2) is equipped with condenser two (C2); the medium output channel of condenser two (C2) is connected to the medium input channel of condenser one (C1).

4. The finishing apparatus according to claim 1, wherein A second storage tank (S2) is provided between the thin-film evaporator (T1) and the distillation column (T2), and the second storage tank (S2) is connected to the vacuum system.

5. The finishing apparatus according to claim 1, wherein The electrolyte receiving unit includes a storage tank (S3), which is connected to a vacuum system.

6. The finishing apparatus according to claim 1, wherein The bottom of the thin-film evaporator (T1) is connected to storage tank four (S4).

7. An electrolyte formulation system characterized by, The apparatus includes the refining device as described in any one of claims 1-6, and a preparation vessel (R1); the inlet of the preparation vessel (R1) is connected to the electrolyte receiving unit.

8. The electrolyte formulation system of claim 7, wherein, The preparation vessel (R1) is equipped with an ammonia inlet pipe (10) and an ethylene glycol inlet pipe (20).

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