An apparatus for treating acidic carbonate solvents
By designing a treatment device for acidic carbonate solvents, and utilizing a neutralization reactor and a refining tower to carry out the neutralization reaction between hydrogen chloride and a deacidifying agent, the problem of treating high-acidity carbonate solvents was solved, achieving efficient solvent separation and reduced energy consumption.
Patent Information
- Application Number
- CN202522630400.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-11
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-12-11
AI Technical Summary
In the production of liquid lithium hexafluorophosphate, the high-acidity carbonate solvent generated cannot be effectively treated, affecting product quality and cannot be reused in previous production processes, resulting in high-cost by-product disposal problems.
A solvent treatment device for acidic carbonates is designed. The device uses a neutralization reactor to neutralize hydrogen chloride and a deacidifying agent, and then separates the solvents using a purification column and a refining tower. The heat generated by the neutralization reaction is used to reduce energy consumption and improve solvent quality.
This method achieves effective separation of dimethyl carbonate and lithium hexafluorophosphate, improves product quality, and reduces production energy consumption through heat recovery.
Smart Images
Figure CN224938178U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of carbonate solvent treatment technology, and in particular to an apparatus for treating acidic carbonate solvents. Background Technology
[0002] During the production of liquid lithium hexafluorophosphate, a portion of carbonate solvent with high acidity is generated, which, if used directly, will affect product quality. Therefore, in order to control the product content, some of the solvent needs to be distilled off. However, this portion of solvent carries a much higher acidity than the product and cannot be reused in previous production processes. It can only be sold as a by-product. Therefore, the problem of how to process this portion of solvent at a low cost to make it reusable is urgent to solve. Utility Model Content
[0003] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing an acid-containing carbonate solvent treatment device. On the one hand, it neutralizes the hydrogen chloride in the solvent with a deacidifying agent, thereby improving the quality of the solvent product. On the other hand, it makes full use of the heat generated by the neutralization reaction, thus reducing energy consumption in the production process.
[0004] The present invention discloses an acid carbonate solvent treatment device, the technical solution of which includes a neutralization vessel (1), a receiving tank (2), a purification column (3), a refining tower (4), a reflux tank (5), a solvent transfer pump (6), a second feed pump (7), a reboiler (8), a tower top condenser (9), and a reflux pump (10). The neutralization vessel (1) and the receiving tank (2) are directly connected by a pipeline; the receiving tank (2) and the purification column (3) are connected by the solvent transfer pump (6). The impurity removal column (3) is connected to the middle and lower side line of the refining column (4) through a pipeline; the top of the refining column (4) is connected to the upper shell side of the top condenser (9) through a pipeline, and the lower part of the top condenser (9) is connected to the top of the reflux tank (5) through a pipeline; the bottom of the reflux tank (5) is connected to the top of the refining column (4) through a reflux pump (10), and the bottom of the refining column (4) is connected to a pipeline and a second feed pump (7), and a reboiler (8) is installed at the bottom of the refining column (4).
[0005] Preferably, the neutralization vessel (1) is provided with an external tracing pipe (1.1) on the outside. The lower side of the external tracing pipe (1.1) is connected to the refrigerant inlet end through a pipeline and a first control valve (1.2), and the upper side of the external tracing pipe (1.1) is connected to the refrigerant outlet end through a pipeline and a second control valve (1.3).
[0006] Preferably, the neutralization vessel (1) described above is equipped with a stirrer (1.4) for mixing the deacidifying agent and the carbonate solvent.
[0007] Preferably, the receiving tank (2) is provided with a water separator (2.1) and a partition plate (2.2) on the material inlet side for the sedimentation and stratification of the deacidifying agent and carbonate solvent, and the material inlet pipe is inserted into the middle and lower part of the material inlet side, with a horizontal height lower than the height of the partition plate (2.2).
[0008] Preferably, the feed inlet of the above-mentioned refining tower (4) is located in the lower part of the tower body.
[0009] Preferably, a product discharge pipeline (11) is provided on the pipeline between the output end of the above-mentioned reflux pump (10) and the top of the refining tower (4).
[0010] The beneficial effects of this utility model are: After the hydrogen chloride-containing material enters the neutralization reactor, the hydrogen chloride reacts with the deacidifying agent in the reactor. After the reaction, the material is temporarily stored in a receiving tank, then impurities are removed by a purification column before being transferred to a refining tower for further purification. Dimethyl carbonate is produced at the top of the tower, and a portion of it can be recycled back to the refining tower for further purification. Lithium hexafluorophosphate solvent is obtained at the bottom of the tower, which improves product quality. In addition, the material inlet side of the receiving tank is equipped with a water separator and a baffle plate for the sedimentation and stratification of the deacidifying agent and carbonate solvent, which facilitates the cleaning of waste residue. Furthermore, since the acid-base neutralization reaction is exothermic, the refrigerant in the external tracing pipe is heated to fully utilize its heat and reduce energy consumption in production. Attached Figure Description
[0011] Figure 1 This is a connection diagram of Embodiment 1 of this utility model; Figure 2 This is a connection diagram of Embodiment 2 of this utility model; In the diagram above: Neutralization vessel 1, Receiving tank 2, Impurity removal column 3, Refining tower 4, Reflux tank 5, Solvent transfer pump 6, Second feed pump 7, Reboiler 8, Tower top condenser 9, Reflux pump 10, Product discharge pipeline 11, External tracing pipe 1.1, First control valve 1.2, Second control valve 1.3, Agitator 1.4, Water separator 2.1, and Isolation plate 2.2. Detailed Implementation
[0012] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0013] Example 1, referring to Figure 1This utility model discloses an acid-containing carbonate solvent treatment device, comprising a neutralization vessel 1, a receiving tank 2, a purification column 3, a refining tower 4, a reflux tank 5, a solvent transfer pump 6, a second feed pump 7, a reboiler 8, a tower top condenser 9, and a reflux pump 10. The neutralization vessel 1 and the receiving tank 2 are directly connected by a pipeline; the receiving tank 2 and the purification column 3 are connected by the solvent transfer pump 6; the purification column 3 is connected by a pipeline to the lower middle side of the refining tower 4; the top of the refining tower 4 is connected by a pipeline to the upper shell side of the tower top condenser 9, and the lower part of the tower top condenser 9 is connected by a pipeline to the top of the reflux tank 5; the bottom of the reflux tank 5 is connected to the top of the refining tower 4 by the reflux pump 10, and the bottom of the refining tower 4 is connected by a pipeline and the second feed pump 7. The reboiler 8 is installed at the bottom of the refining tower 4.
[0014] The neutralization vessel 1 described above is equipped with a stirrer 1.4 for mixing the deacidifying agent and the carbonate solvent.
[0015] The receiving tank 2 is equipped with a water separator 2.1 and a partition plate 2.2 on the material inlet side for the sedimentation and stratification of the deacidifying agent and carbonate solvent. The material inlet pipe is inserted into the lower middle part of the material inlet side, and its horizontal height is lower than that of the partition plate 2.2. This allows the acid-base neutralized waste residue to settle on the material inlet side of the receiving tank 2. The lower side of the water separator 2.1 can be opened periodically to clean the waste residue.
[0016] The feed inlet of the aforementioned refining tower 4 is located in the lower middle part of the tower body.
[0017] A product discharge pipeline 11 is provided on the pipeline between the output end of the aforementioned reflux pump 10 and the top of the refining tower 4.
[0018] In the application of this invention, taking the material produced in the lithium hexafluorophosphate synthesis section containing 20% lithium hexafluorophosphate, 2% hydrogen chloride, and 78% dimethyl carbonate as an example, the hydrogen chloride-containing material enters the neutralization reactor 1, where the 2% hydrogen chloride and the deacidifying agent undergo a neutralization reaction. After the reaction, the material is temporarily stored in the receiving tank 2. After impurity removal by the solvent transfer pump 6 through the impurity removal column 3, it is transferred to the refining tower 4 for refining. The dimethyl carbonate gas produced at the top of the tower is then condensed into a liquid. A portion of this liquid can be returned to the refining tower 4 for further refining, while the other portion can be collected. The bottom of the refining tower 4 yields liquid lithium hexafluorophosphate solvent, thus achieving the separation of dimethyl carbonate and lithium hexafluorophosphate.
[0019] Example 2: The present invention provides an acid-containing carbonate solvent treatment device, comprising a neutralization vessel 1, a receiving tank 2, a purification column 3, a refining tower 4, a reflux tank 5, a solvent transfer pump 6, a second feed pump 7, a reboiler 8, a tower top condenser 9, and a reflux pump 10. The neutralization vessel 1 and the receiving tank 2 are directly connected by a pipeline; the receiving tank 2 and the purification column 3 are connected by the solvent transfer pump 6; the purification column 3 is connected by a pipeline to the lower middle side of the refining tower 4; the top of the refining tower 4 is connected by a pipeline to the upper shell side of the tower top condenser 9, and the lower part of the tower top condenser 9 is connected by a pipeline to the top of the reflux tank 5; the bottom of the reflux tank 5 is connected to the top of the refining tower 4 by the reflux pump 10, and the bottom of the refining tower 4 is connected by a pipeline and the second feed pump 7. The reboiler 8 is installed at the bottom of the refining tower 4.
[0020] The difference from Example 1 is: Reference Figure 2 In this embodiment, an external tracing pipe 1.1 is provided on the outside of the neutralization vessel 1. The lower side of the external tracing pipe 1.1 is connected to the refrigerant inlet end through a pipeline and a first control valve 1.2, and the upper side of the external tracing pipe 1.1 is connected to the refrigerant outlet end through a pipeline and a second control valve 1.3.
[0021] Since the neutralization reaction of acid and base is an exothermic reaction, the refrigerant in the external tracing pipe 1.1 is heated to make full use of its heat.
[0022] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.
Claims
1. An apparatus for treating acidic carbonate solvents, characterized in that: The system includes a neutralization vessel (1), a receiving tank (2), a purification column (3), a refining tower (4), a reflux tank (5), a solvent transfer pump (6), a second feed pump (7), a reboiler (8), a tower top condenser (9), and a reflux pump (10). The neutralization vessel (1) and the receiving tank (2) are directly connected by a pipeline. The receiving tank (2) and the purification column (3) are connected by the solvent transfer pump (6). The purification column (3) is connected to the lower middle side of the refining tower (4) by a pipeline. The top of the refining tower (4) is connected to the upper shell side of the tower top condenser (9) by a pipeline. The lower part of the tower top condenser (9) is connected to the top of the reflux tank (5) by a pipeline. The bottom of the reflux tank (5) is connected to the top of the refining tower (4) by the reflux pump (10). The bottom of the refining tower (4) is connected by a pipeline and the second feed pump (7). The reboiler (8) is installed at the bottom of the refining tower (4).
2. An acid carbonate solvent treatment apparatus according to claim 1, wherein: The neutralization vessel (1) is provided with an external tracing pipe (1.1) on the outside. The lower side of the external tracing pipe (1.1) is connected to the refrigerant inlet end through a pipeline and a first control valve (1.2), and the upper side of the external tracing pipe (1.1) is connected to the refrigerant outlet end through a pipeline and a second control valve (1.3).
3. An acid carbonate solvent treatment apparatus according to claim 2, wherein: The neutralization vessel (1) is equipped with a stirrer (1.4) for mixing the deacidifying agent and the carbonate solvent.
4. The acid carbonate solvent treatment apparatus of claim 2, wherein: The receiving tank (2) is provided with a water separator (2.1) and a partition plate (2.2) on the material inlet side for the sedimentation and stratification of the deacidifying agent and carbonate solvent. The material inlet pipe is inserted into the middle and lower part of the material inlet side, and its horizontal height is lower than that of the partition plate (2.2).
5. An acid carbonate solvent treatment apparatus according to claim 4, wherein: The feed inlet of the refining tower (4) is located in the lower part of the tower body.
6. The apparatus for treating acidic carbonate solvents according to claim 5, characterized in that: A product discharge pipeline (11) is provided on the pipeline between the output end of the reflux pump (10) and the top of the refining tower (4).