Pentafluoroethane catalyst regeneration optimization device

Abstract

The utility model relates to the technical field of pentafluoroethane production, in particular to a pentafluoroethane catalyst regeneration optimization device. The pentafluoroethane catalyst regeneration optimization device comprises an AHF pipeline and an N2 pipeline, an AHF flowmeter and an AHF regulating valve are arranged on the AHF pipeline, an N2 flowmeter and an N2 regulating valve are arranged on the N2 pipeline, the AHF pipeline and the N2 pipeline are both connected with an inlet of a preheater, an outlet of the preheater is connected with an inlet of a mixing tank, an outlet of the mixing tank is connected with a gas inlet in the top of a reactor through a gas feeding pipe, and the gas feeding pipe is connected with a gas outlet in the top of the reactor. The bottom outlet of the reactor is connected with an alkaline tower, the upper part of the alkaline tower is provided with an alkaline water pipe and is connected with an alkaline water tank, the top of the alkaline tower is provided with a gas outlet pipe, the gas outlet pipe is connected with the alkaline water pipe, the gas outlet pipe is provided with a condenser, and the gas outlet of the condenser is connected with the N2 pipeline through a gas return pipe. According to the utility model, corrosion of hydrofluoric acid to equipment is reduced; the catalyst is protected, and the service cycle and the service life of the catalyst are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pentafluoroethane production, in particular to a pentafluoroethane catalyst regeneration optimization device. Background Art

[0002] During the production of pentafluoroethane, corrosive substances are generated during catalyst regeneration. After commissioning, the initial dehydration of the catalyst produces a high moisture content of hydrogen fluoride, generating highly corrosive aqueous hydrofluoric acid. Furthermore, after air regeneration of the catalyst is complete and AHF (anhydrous hydrogen fluoride) is introduced, the AHF reacts with the catalyst to produce water, generating a corrosive aqueous acidic material. In existing production processes, the fumigation / dehydration process accumulates aqueous hydrofluoric acid in the reactor vessel, causing varying degrees of corrosion to the reaction system equipment, shortening its lifespan. Therefore, the aqueous hydrofluoric acid should be promptly discharged, as circulating it in the system is detrimental to catalyst activation.

[0003] To address this issue, the current method mainly uses pressure and temperature to determine the water enrichment situation. After the material circulates in the system, water removal operations are carried out regularly. However, this measure cannot intuitively reflect the equipment status and is prone to cause equipment corrosion. Utility Model Content

[0004] The technical problem to be solved by the utility model is to propose a pentafluoroethane catalyst regeneration optimization device, which reduces the corrosion of hydrofluoric acid on the equipment; is beneficial to protecting the catalyst, prolonging the service cycle, and increasing the life of the catalyst.

[0005] The pentafluoroethane catalyst regeneration optimization device of the utility model comprises an AHF pipeline and an N2 pipeline. The AHF pipeline is provided with an AHF flowmeter and an AHF regulating valve. The N2 pipeline is provided with an N2 flowmeter and an N2 regulating valve. The AHF pipeline and the N2 pipeline are both connected to a preheater inlet. The preheater outlet is connected to a mixing tank inlet. The mixing tank outlet is connected to an air inlet at the top of a reactor through an air supply pipe. The bottom outlet of the reactor is connected to an alkali washing tower. An alkali water pipe is provided at the top of the alkali washing tower and is connected to an alkali water tank. An air outlet pipe is provided at the top of the alkali washing tower and is connected to the alkali water pipe. A condenser is provided on the air outlet pipe. The air outlet of the condenser is connected to the N2 pipeline through an air return pipe.

[0006] Preferably, a heating tube is provided in the preheater.

[0007] Preferably, an air supply flow meter and an air supply regulating valve are provided on the air supply pipe.

[0008] Preferably, the condenser is provided with a refrigerant inlet and a refrigerant outlet.

[0009] Preferably, a spray pipe is provided in the alkali washing tower, and the spray pipe is connected to the alkali water pipe.

[0010] Preferably, fillers are provided in the alkali washing tower.

[0011] Preferably, an alkaline water pump is provided on the alkaline water pipe.

[0012] Preferably, a dryer is provided on the air return pipe, and a desiccant is provided in the dryer.

[0013] Valves can be installed on the pipeline according to control needs, and the flow of materials in the corresponding pipeline can be conveniently controlled and adjusted by opening and closing the valves.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The AHF flowmeter and AHF regulating valve on the AHF pipeline, as well as the N2 flowmeter and N2 regulating valve on the N2 pipeline, accurately measure the HF and N2 feeds, reducing the generation of moisture and reducing the corrosion of the reactor and subsequent pipeline equipment;

[0016] 2. After the feeding is completed, the inside of the reaction tower is purged with hot N2 alone, and the generated hydrofluoric acid and excess HF gas are promptly discharged into the alkali washing tower and absorbed by the alkaline liquid at the bottom, further reducing corrosion. At the same time, a small amount of HF-containing gas enters the alkali washing tower and contacts with the alkali liquid in reverse, and is absorbed by the alkali liquid while being cooled; a small amount of water-containing gas enters the condenser through the top of the alkali washing tower and is condensed into liquid, and enters the alkali washing tower together with the alkaline water in the alkaline water pipe as a spray liquid. At the same time, the dry N2 is sent to the N2 pipeline for recycling, saving N2 resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] In the figure: 1. AHF pipeline; 2. N2 pipeline; 3. AHF flowmeter; 4. AHF regulating valve; 5. N2 flowmeter; 6. N2 regulating valve; 7. Preheater; 8. Mixing tank; 9. Air supply pipe; 10. Reactor; 11. Alkali washing tower; 12. Alkali water pipe; 13. Alkali water tank; 14. Air outlet pipe; 15. Condenser; 16. Air supply flowmeter; 17. Air supply regulating valve; 18. Spray pipe; 19. Alkali water pump; 20. Return air pipe; 21. Dryer. DETAILED DESCRIPTION

[0019] The present invention will be described clearly and completely below with reference to the accompanying drawings.

[0020] like Figure 1As shown, the pentafluoroethane catalyst regeneration optimization device described in the utility model includes an AHF pipeline 1 and an N2 pipeline 2. The AHF pipeline 1 is provided with an AHF flowmeter 3 and an AHF regulating valve 4, and the N2 pipeline 2 is provided with an N2 flowmeter 5 and an N2 regulating valve 6. The AHF pipeline 1 and the N2 pipeline 2 are both connected to the inlet of the preheater 7, the outlet of the preheater 7 is connected to the inlet of the mixing tank 8, the outlet of the mixing tank 8 is connected to the air inlet at the top of the reactor 10 through the air supply pipe 9, and the bottom outlet of the reactor 10 is connected to the alkali washing tower 11. The upper part of the alkali washing tower 11 is provided with an alkaline water pipe 12, which is connected to the alkaline water tank 13. The top of the alkali washing tower 11 is provided with an outlet pipe 14, which is connected to the alkaline water pipe 12. A condenser 15 is provided on the outlet pipe 14, and the outlet of the condenser 15 is connected to the N2 pipeline 2 through the return air pipe 20.

[0021] A heating tube is provided in the preheater 7 .

[0022] The air supply pipe 9 is provided with an air supply flow meter 16 and an air supply regulating valve 17 .

[0023] The condenser 15 is provided with a refrigerant inlet and a refrigerant outlet.

[0024] A spray pipe 18 is provided in the alkali washing tower 11 , and the spray pipe 18 is connected to the alkali water pipe 12 .

[0025] The alkali washing tower 11 is provided with fillers.

[0026] The alkaline water pipe 12 is provided with an alkaline water pump 19 .

[0027] A dryer 21 is provided on the return air pipe 20 , and a desiccant is provided in the dryer 21 .

[0028] The working process is as follows: HF and N2 are accurately metered through the AHF flowmeter 3 and AHF regulating valve 4 on the AHF pipeline 1, and the N2 flowmeter 5 and N2 regulating valve 6 on the N2 pipeline 2. HF and N2 enter the preheater 7 for heating, then enter the mixing tank 8 for thorough mixing, and then enter the reactor 10 through the air supply pipe 9.

[0029] After the feeding is completed, the HF feed is turned off and N2 is used for purging. The N2 heated by the preheater is used to purge the mixing tank 8 and the reactor 10. The generated hydrogen fluoride enters the alkaline solution at the bottom of the alkaline water tank 13 and is absorbed. The remaining gas flows upward and contacts the liquid sprayed from the spray pipe 18 in the opposite direction. While the gas is cooled, a small amount of HF is absorbed. The gas then passes through the outlet pipe 14 and enters the condenser 15 for condensation. The resulting condensed water enters the alkaline water pipe 12 and enters the alkaline washing tower 11 together with the alkaline water as a spray liquid and is sprayed from the spray pipe 18. After passing through the condenser 15, most of the moisture and HF in the gas are removed. The remaining N2 enters the return gas pipe 20, is further dried by the dryer 21, and is then sent to the N2 pipeline for recycling.

Claims

1. A pentafluoroethane catalyst regeneration optimization device, characterized in that: The invention comprises an AHF pipeline (1) and an N2 pipeline (2). The AHF pipeline (1) is provided with an AHF flowmeter (3) and an AHF regulating valve (4). The N2 pipeline (2) is provided with an N2 flowmeter (5) and an N2 regulating valve (6). The AHF pipeline (1) and the N2 pipeline (2) are both connected to the inlet of a preheater (7). The outlet of the preheater (7) is connected to the inlet of a mixing tank (8). The outlet of the mixing tank (8) is connected to the air inlet at the top of a reactor (10) through an air supply pipe (9). The outlet at the bottom of the reactor (10) is connected to an alkali washing tower (11). An alkali water pipe (12) is provided on the top of the alkali washing tower (11) and is connected to an alkali water tank (13). An air outlet pipe (14) is provided on the top of the alkali washing tower (11). The air outlet pipe (14) is connected to the alkali water pipe (12). A condenser (15) is provided on the air outlet pipe (14). The air outlet of the condenser (15) is connected to the N2 pipeline (2) through an air return pipe (20).

2. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: A heating pipe is provided in the preheater (7).

3. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: An air supply flow meter (16) and an air supply regulating valve (17) are provided on the air supply pipe (9).

4. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: The condenser (15) is provided with a refrigerant inlet and a refrigerant outlet.

5. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: A spray pipe (18) is provided in the alkali washing tower (11), and the spray pipe (18) is connected to the alkali water pipe (12).

6. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: The alkali washing tower (11) is provided with fillers.

7. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: The alkaline water pipe (12) is provided with an alkaline water pump (19).

8. The pentafluoroethane catalyst regeneration optimization device according to claim 1, characterized in that: A dryer (21) is provided on the air return pipe (20), and a desiccant is provided in the dryer (21).

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