Tetrafluoroethylene vacuum recovery system

Abstract

The utility model relates to the technical field of vacuum recovery systems, and particularly discloses a tetrafluoroethylene vacuum recovery system which comprises a first vacuum degassing chamber, a second vacuum degassing chamber, a primary condenser, a first steam-jet pump, a second steam-jet pump, a secondary condenser and a water ring vacuum pump, the first vacuum degassing chamber is arranged above the second vacuum degassing chamber, the first vacuum degassing chamber and the second vacuum degassing chamber are connected through a second liquid pipeline, the bottom of the second vacuum degassing chamber is connected with a third liquid pipeline, and an inlet of the first steam jet pump is connected with the upper portion of the second vacuum degassing chamber through a first gas pipeline. And an outlet of the first steam-jet pump is connected with the first vacuum degassing chamber through a second gas pipeline. According to the vacuum recovery system disclosed by the utility model, tetrafluoroethylene gas can be subjected to vacuum recovery in a multi-stage vacuum degassing, condensing and heating manner, so that the recovery efficiency of the tetrafluoroethylene gas can be improved while the equipment cost is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum recovery systems and is applied to the fluorine chemical industry, in particular to a tetrafluoroethylene vacuum recovery system. Background Art

[0002] Existing fluorine chemical companies will produce waste liquid after drying tetrafluoroethylene with sulfuric acid. This waste liquid contains trace amounts of tetrafluoroethylene. Direct discharge wastes the tetrafluoroethylene raw material. Usually, companies will adopt recycling methods to improve their efficiency. However, existing recycling devices are relatively expensive. In order to recover trace amounts of tetrafluoroethylene, expensive equipment is used, which will increase the recycling cost and thus will not bring much benefit to the company. Therefore, the meaning of recycling tetrafluoroethylene is lost. In order to reduce the recycling cost and improve the efficiency of tetrafluoroethylene recovery, there is an urgent need to design a tetrafluoroethylene vacuum recovery system to solve the above problems, and at the same time save energy and reduce emissions for the company and achieve a greener production process. Summary of the Invention

[0003] The utility model aims to provide a tetrafluoroethylene vacuum recovery system, which solves the above-mentioned problem that the existing device for recovering trace tetrafluoroethylene is too high in cost, resulting in increased recovery costs, and the problem that the existing low-cost device has low recovery efficiency.

[0004] To solve the above technical problems, the utility model provides a tetrafluoroethylene vacuum recovery system, comprising a first vacuum degassing chamber, a second vacuum degassing chamber, a first condenser, a first steam jet pump, a second steam jet pump, a second condenser and a water ring vacuum pump, wherein the inlet of the first vacuum degassing chamber is connected to a first liquid pipeline, the first vacuum degassing chamber is arranged above the second vacuum degassing chamber, and the two are connected by a second liquid pipeline, the bottom of the second vacuum degassing chamber is connected to a third liquid pipeline, the inlet of the first steam jet pump is connected to the upper part of the second vacuum degassing chamber through a first gas pipeline, the outlet of the first steam jet pump is connected to the first vacuum degassing chamber through a second gas pipeline, the first vacuum degassing chamber is connected to the first condenser through a third gas pipeline, the outlet of the first condenser is connected to the second steam jet pump through a fourth gas pipeline, the outlet of the second steam jet pump is connected to the second condenser through a fifth gas pipeline, the outlet of the second condenser is connected to the water ring vacuum pump, and the water ring vacuum pump is connected to a main pipeline.

[0005] Furthermore, the bottoms of the primary condenser and the secondary condenser are connected to a first acidic water pipeline and a second acidic water pipeline respectively, and the outlet ends of the first acidic water pipeline and the second acidic water pipeline are both connected to storage tanks.

[0006] Furthermore, the driving source inlets of the first steam jet pump and the second steam jet pump are respectively connected to the first superheated steam pipe and the second superheated steam pipe, and the inlet ends of the first superheated steam pipe and the second superheated steam pipe are connected to the superheated steam main pipe.

[0007] Furthermore, the inlet end of the primary condenser is connected to a first circulating water inlet pipe, and the outlet end of the primary condenser is connected to a first circulating water return pipe.

[0008] Furthermore, the inlet end of the secondary condenser is connected to a second circulating water inlet pipe, the outlet end of the secondary condenser is connected to a second circulating water return pipe, the second circulating water inlet pipe and the first circulating water inlet pipe are both connected to a circulating water inlet main pipe, and the second circulating water return pipe and the first circulating water return pipe are both connected to a circulating water return main pipe.

[0009] Beneficial effects of the utility model: The vacuum recovery system of the utility model can vacuum recover trace tetrafluoroethylene gas in the sulfuric acid adsorbent through multi-stage vacuum degassing, condensation and heating, so that the recovered sulfuric acid solution can continue to be used in the next process, while increasing the equipment cost and also improving the recovery efficiency of tetrafluoroethylene gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 This is an overall schematic diagram of a tetrafluoroethylene vacuum recovery system of the utility model;

[0012] In the figure: 1-first vacuum degassing chamber, 2-second vacuum degassing chamber, 3-primary condenser, 4-first steam jet pump, 5-second steam jet pump, 6-secondary condenser, 7-water ring vacuum pump, 8-first liquid pipeline, 9-second liquid pipeline, 10-third liquid pipeline, 11-first gas pipeline, 12-second gas pipeline, 13-third gas pipeline, 14-fourth gas pipeline, 15-fifth gas pipeline, 16-main pipeline, 17-first acidic water pipeline, 18-second acidic water pipeline, 19-storage tank, 20-first superheated steam pipeline, 21-second superheated steam pipeline, 22-superheated steam main pipeline, 23-first circulating water inlet pipeline, 24-first circulating water return pipeline, 25-second circulating water inlet pipeline, 26-second circulating water return pipeline, 27-circulating water inlet main pipeline, 28-circulating water return main pipeline. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings of the present invention specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the utility model.

[0014] In a specific embodiment of the present invention, Figure 1 As shown, a tetrafluoroethylene vacuum recovery system is specifically disclosed, including a first vacuum degassing chamber 1, a second vacuum degassing chamber 2, a primary condenser 3, a first steam jet pump 4, a second steam jet pump 5, a secondary condenser 6 and a water ring vacuum pump 7. The inlet of the first vacuum degassing chamber 1 is connected to a first liquid pipeline 8, the first vacuum degassing chamber 1 is arranged above the second vacuum degassing chamber 2, and the two are connected by a second liquid pipeline 9. The bottom of the second vacuum degassing chamber 2 is connected to a third liquid pipeline 10, the inlet of the first steam jet pump 4 is connected to the upper part of the second vacuum degassing chamber 2 through a first gas pipeline 11, the outlet of the first steam jet pump 4 is connected to the first vacuum degassing chamber 1 through a second gas pipeline 12, the first vacuum degassing chamber 1 is connected to the first condenser 3 through a third gas pipeline 13, the outlet of the first condenser 3 is connected to the second steam jet pump 5 through a fourth gas pipeline 14, the outlet of the second steam jet pump 5 is connected to the secondary condenser 6 through a fifth gas pipeline 15, the outlet of the secondary condenser 6 is connected to the water ring vacuum pump 7, and the water ring vacuum pump 7 is connected to a main pipeline 16.

[0015] The bottoms of the primary condenser 3 and the secondary condenser 6 are connected to a first acidic water pipeline 17 and a second acidic water pipeline 18 respectively. The outlet ends of the first acidic water pipeline 17 and the second acidic water pipeline 18 are both connected to a storage tank 19 .

[0016] The driving source inlets of the first steam jet pump 4 and the second steam jet pump 5 are respectively connected to the first superheated steam pipe 20 and the second superheated steam pipe 21. The driving force of the first steam jet pump 4 and the second steam jet pump 5 are both superheated steam. The inlet ends of the first superheated steam pipe 20 and the second superheated steam pipe 21 are connected to the superheated steam main pipe 22.

[0017] The inlet end of the primary condenser 3 is connected to a first circulating water inlet pipe 23 , and the outlet end of the primary condenser 3 is connected to a first circulating water return pipe 24 .

[0018] The inlet end of the secondary condenser 6 is connected to the second circulating water inlet pipe 25, and the outlet end of the secondary condenser 6 is connected to the second circulating water return pipe 26. The second circulating water inlet pipe 25 and the first circulating water inlet pipe 23 are both connected to the circulating water inlet main pipe 27, and the second circulating water return pipe 26 and the first circulating water return pipe 24 are both connected to the circulating water return main pipe 28. The cooling medium of the primary condenser 3 and the secondary condenser 6 is circulating water.

[0019] The vacuum recovery system of the utility model can vacuum recover trace tetrafluoroethylene gas in the sulfuric acid adsorbent by multi-stage vacuum degassing, condensation and heating, so that the recovered sulfuric acid solution can be further used in the next process, while reducing equipment costs and also improving the recovery efficiency of tetrafluoroethylene gas.

[0020] The workflow of this utility model:

[0021] The sulfuric acid solution mixed with trace amounts of tetrafluoroethylene gas is transported to the first vacuum degassing chamber 1 through the first liquid pipeline 8. The gaseous phase is then degassed and transported to the primary condenser 3 for condensation under a vacuum condition of 10 kPa.A. The second steam jet pump 5 extracts the non-condensable gas in the primary condenser 3 and transports it to the secondary condenser 6 for condensation again. The non-condensable gas in the secondary condenser 6 is extracted by the water ring vacuum pump 7 and directly transported to the tetrafluoroethylene main pipeline 16 for further utilization. Thus, the trace amount of tetrafluoroethylene gas in the sulfuric acid solution is vacuum recovered through simple steps, thereby improving the tetrafluoroethylene gas recovery efficiency and simultaneously increasing the concentration of the sulfuric acid solution.

[0022] When the gas phase vacuum condition in the second vacuum degassing chamber 2 reaches a vacuum degree of 6 kPa.A, the first steam jet pump 4 evacuates the gas and sprays high-temperature gas into the first vacuum degassing chamber 1 through the first steam jet pump 4 to heat the liquid therein, making it easier to desorb the tetrafluoroethylene gas in the heated liquid. The sulfuric acid solution from which the tetrafluoroethylene gas has been removed in the first vacuum degassing chamber 1 flows into the second vacuum degassing chamber 2 under the action of gravity. After the secondary degassing in the second vacuum degassing chamber 2, the sulfuric acid solution flows out under the action of gravity into the third liquid pipeline 10 and is transported to the next process through the third liquid pipeline 10. At the same time, the acidic water in the primary condenser 3 and the secondary condenser 6 are discharged into the storage tank 19 through the first acidic water pipeline 17 and the second acidic water pipeline 18 connected at the bottom, respectively.

[0023] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A tetrafluoroethylene vacuum recovery system, characterized in that: The invention comprises a first vacuum degassing chamber (1), a second vacuum degassing chamber (2), a primary condenser (3), a first steam jet pump (4), a second steam jet pump (5), a secondary condenser (6) and a water ring vacuum pump (7), wherein the inlet of the first vacuum degassing chamber (1) is connected to a first liquid pipeline (8), the first vacuum degassing chamber (1) is arranged above the second vacuum degassing chamber (2), and the two are connected via a second liquid pipeline (9), the bottom of the second vacuum degassing chamber (2) is connected to a third liquid pipeline (10), the inlet of the first steam jet pump (4) is connected to the second vacuum degassing chamber (2) via a first gas pipeline (11), and the inlet of the first steam jet pump (4) is connected to the second vacuum degassing chamber ( 2), the outlet of the first steam jet pump (4) is connected to the first vacuum degassing chamber (1) through a second gas pipeline (12), the first vacuum degassing chamber (1) is connected to the first-stage condenser (3) through a third gas pipeline (13), the outlet of the first-stage condenser (3) is connected to the second steam jet pump (5) through a fourth gas pipeline (14), the outlet of the second steam jet pump (5) is connected to the second-stage condenser (6) through a fifth gas pipeline (15), the outlet of the second-stage condenser (6) is connected to the water ring vacuum pump (7), and the water ring vacuum pump (7) is connected to a main pipeline (16).

2. A tetrafluoroethylene vacuum recovery system according to claim 1, characterized in that: The bottoms of the primary condenser (3) and the secondary condenser (6) are respectively connected to a first acidic water pipeline (17) and a second acidic water pipeline (18), and the outlet ends of the first acidic water pipeline (17) and the second acidic water pipeline (18) are both connected to a storage tank (19).

3. A tetrafluoroethylene vacuum recovery system according to claim 1, characterized in that: The driving source inlets of the first steam jet pump (4) and the second steam jet pump (5) are respectively connected to a first superheated steam pipe (20) and a second superheated steam pipe (21), and the inlet ends of the first superheated steam pipe (20) and the second superheated steam pipe (21) are connected to a superheated steam main pipe (22).

4. A tetrafluoroethylene vacuum recovery system according to claim 1, characterized in that: The inlet end of the primary condenser (3) is connected to a first circulating water inlet pipe (23), and the outlet end of the primary condenser (3) is connected to a first circulating water return pipe (24).

5. A tetrafluoroethylene vacuum recovery system according to claim 4, characterized in that: The inlet end of the secondary condenser (6) is connected to a second circulating water inlet pipe (25), the outlet end of the secondary condenser (6) is connected to a second circulating water return pipe (26), the second circulating water inlet pipe (25) and the first circulating water inlet pipe (23) are both connected to a circulating water inlet main pipe (27), and the second circulating water return pipe (26) and the first circulating water return pipe (24) are both connected to a circulating water return main pipe (28).

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