Trifluoroacetyl chloride rectifying tower

Abstract

The utility model discloses a trifluoroacetyl chloride rectifying tower, which belongs to the technical field of chemical engineering and is characterized in that a circulating distillation kettle is connected with a trifluoroacetyl chloride rectifying tower assembly, the trifluoroacetyl chloride rectifying tower assembly is connected with a reboiler assembly, the trifluoroacetyl chloride rectifying tower assembly is connected with a condenser assembly, and the condenser assembly is connected with a return tank. And the return tank is connected with a gasifier assembly. When trifluoroacetyl chloride steam mixed with F113a and SO3 enters the condenser, non-condensable F113a and SO3 gas in the condenser is recycled into the falling film absorption tower, low-temperature frozen silicone oil flows through the condenser from a low-temperature frozen silicone oil outlet, supplies cold to the condenser and then flows into the expansion tank, and a water return pipe of the condenser absorbs cold air of the expansion tank for cooling and condensation; the liquid phase in the condenser enters the reflux tank, and the residual F113a and SO3 gas in the reflux tank are recycled into the falling film absorption tower again, so that the efficient recycling of F113a and SO3 is achieved, and the unit consumption of SO3 and F113a is reduced to 1.10 and 2.05 from 1.48 and 2.83.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a trifluoroacetyl chloride rectification tower. Background Art

[0002] The production of trifluoroacetyl chloride is to add 1,1,2-trifluorotrichloroethane and sulfur trioxide (hereinafter referred to as F113a and SO3) and a catalyst into an oxidation kettle to produce trifluoroacetyl chloride and sulfuryl chloride. There is a large amount of F113a in the product, so it needs to be purified in a distillation tower.

[0003] For example, Chinese patent CN213192565U proposes a distillation tower for trifluoroacetyl chloride production, including a distillation tower body, on which a feed pipe, an upper discharge pipe and a lower discharge pipe are provided, a heat dissipation component is provided on the upper part of the distillation tower body, a pressure relief component is provided on the outer wall of the distillation tower body, a sleeve-shaped explosion-proof plate is fixedly sleeved on the outer wall of the distillation tower body, and the distillation tower body includes an inner tower and an outer tower, which improves the cooling efficiency and safety of the distillation tower compared with the prior art.

[0004] Although the above patent can realize the recycling of raw materials, the raw materials cannot be continuously put into the oxidation kettle for reaction. The raw materials need to be processed before they can be used again, and the recycling efficiency is not high.

[0005] Based on this, the utility model designs a trifluoroacetyl chloride distillation tower to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a trifluoroacetyl chloride distillation tower.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A trifluoroacetyl chloride rectification column, including a circulating still;

[0009] The discharge end of the circulating still is connected to a trifluoroacetyl chloride rectification tower assembly for rectifying and purifying trifluoroacetyl chloride and recovering F113a;

[0010] The liquid outlet end of the trifluoroacetyl chloride distillation tower component is connected to a reboiler component for circulating and heating the liquid in the trifluoroacetyl chloride distillation tower component;

[0011] One of the steam outlet ends of the trifluoroacetyl chloride rectification tower assembly is connected to a condenser assembly for separating trifluoroacetyl chloride;

[0012] The liquid outlet end of the condenser assembly is connected to a reflux tank for further separating trifluoroacetyl chloride;

[0013] The liquid outlet end of the reflux tank is connected with a vaporizer component for vaporizing liquid trifluoroacetyl chloride.

[0014] The trifluoroacetyl chloride rectification tower component comprises a rectification tower, a first side line extraction port, a second side line extraction port, a crude sulfuryl chloride storage tank, an oxidation reactor, a waste buffer, a hot water tank and a plate heat exchanger, the discharge end of the circulating distillation reactor is connected to the feed end of the rectification tower, the discharge end of the rectification tower is connected to the crude sulfuryl chloride storage tank, the exhaust gas outlet end of the rectification tower is connected to the waste buffer, the water inlet end of the rectification tower is connected to the hot water tank, the water outlet end of the rectification tower is connected to the plate heat exchanger, the second side line extraction port and the first side line extraction port are respectively arranged above the feed end of the rectification tower, the first side line extraction port is higher than the second side line extraction port, and the first side line extraction port and the second side line extraction port are both connected to the oxidation reactor.

[0015] Furthermore, the distillation tower is connected to the reboiler assembly, and the distillation tower is connected to the reflux tank.

[0016] Furthermore, the distillation tower is connected to a condenser assembly.

[0017] Furthermore, the reboiler assembly includes a reboiler, a steam main and a waste hot water tank, the liquid outlet end of the distillation tower is connected to the liquid inlet end of the reboiler, the liquid outlet end of the reboiler is connected to one of the liquid inlets of the distillation tower, the steam inlet end of the reboiler is connected to the steam main, and the water outlet end of the reboiler is connected to the waste hot water tank.

[0018] Furthermore, when the raw materials in the distillation tower enter the reboiler for heating, they are sent to the distillation tower again. This cycle is repeated to ensure that the temperature of the raw materials in the distillation tower is stable. The low-pressure saturated steam flows from the steam main through the reboiler and provides heat for the reboiler before flowing into the waste hot water tank.

[0019] Furthermore, the condenser assembly includes a condenser, a low-temperature refrigeration silicone oil outlet, an expansion tank, a falling film absorption tower and a condenser return pipe, one of the steam outlet ends of the distillation tower is connected to the steam inlet end of the condenser, the oil inlet end of the condenser is connected to the low-temperature refrigeration silicone oil outlet, the oil outlet end of the condenser is connected to the expansion tank through the outer wall of the condenser return pipe, and the steam outlet end of the condenser is connected to the falling film absorption tower.

[0020] Furthermore, the liquid outlet end of the condenser is connected to the liquid inlet end of the reflux tank, the steam outlet end of the reflux tank is connected to the falling film absorption tower, the liquid outlet end of the reflux tank is respectively connected to the steam inlet end of the distillation tower and the vaporizer assembly, and the exhaust gas outlet end of the reflux tank is connected to the waste buffer.

[0021] Furthermore, the gasifier assembly includes a gasifier, a circulating water outlet, a circulating water main, a production pump and a pulsation damper. The liquid outlet end of the reflux tank is connected to the liquid inlet end of the gasifier through the pulsation damper and the production pump, the steam outlet end of the gasifier is connected to the falling film absorption tower, the water inlet end of the gasifier is connected to the circulating water outlet, and the water outlet end of the gasifier is connected to the circulating water main.

[0022] Furthermore, a plurality of temperature detection devices are arranged on the side line of the distillation tower, and the temperature in the tower is maintained below the lowest boiling point of the raw materials, 44.8°C.

[0023] Furthermore, a plurality of groups of thermal gas mass flow meters are installed on the connecting pipeline.

[0024] The utility model has the following technical effects:

[0025] In the utility model, when the raw materials in the circulating distillation kettle enter the distillation tower, the reboiler component repeatedly heats the raw materials in the distillation tower to ensure the temperature of the raw materials is stable, the crude sulfuryl chloride in the distillation tower enters the crude sulfuryl chloride storage tank, F113a and SO3 in the distillation tower are respectively recovered from the first side line production port and the second side line production port to the oxidation reaction kettle for continuous reaction, the waste gas enters the waste buffer from the top of the distillation tower, the trifluoroacetyl chloride steam mixed with F113a and SO3 enters the condenser component, and the hot circulating water flows from the hot water tank through the distillation tower and flows into the plate heat exchanger after providing heat for the distillation tower.

[0026] According to the utility model, when trifluoroacetyl chloride steam mixed with F113a and SO3 enters the condenser, the non-condensable F113a and SO3 gases in the condenser are recovered to the falling film absorption tower, the low-temperature refrigeration silicone oil flows from the low-temperature refrigeration silicone oil outlet through the condenser and flows into the expansion tank after cooling the condenser, and the condenser return pipe cools and condenses by absorbing the cold air of the expansion tank; the liquid phase in the condenser enters the reflux tank, and the residual F113a and SO3 gases in the reflux tank are recovered to the falling film absorption tower again, so as to achieve efficient recovery of F113a and SO3, and the unit consumption of SO3 and F113a is reduced from 1.48 and 2.83 to 1.10 and 2.05; the waste gas in the reflux tank enters the waste buffer, and part of the liquid trifluoroacetyl chloride in the reflux tank is vaporized and flows back to the distillation tower to keep the temperature balance in the distillation tower, and the remaining liquid trifluoroacetyl chloride enters the vaporizer component.

[0027] When the liquid trifluoroacetyl chloride in the reflux tank passes through the pulsation damper, the pressure pulsation of the liquid in the pipeline is eliminated and then the liquid is transported to the gasifier by the extraction pump, thereby achieving the protection effect on the gasifier. The liquid trifluoroacetyl chloride is vaporized in the gasifier and then returns to the falling film absorption tower. The circulating water flows through the gasifier from the circulating water outlet and provides heat for the gasifier and then flows into the circulating water main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic structural diagram of a trifluoroacetyl chloride distillation tower of the utility model;

[0030] Figure 2 It is a schematic structural diagram of a trifluoroacetyl chloride distillation tower of the utility model;

[0031] Figure 3 The utility model is a flow chart of the trifluoroacetyl chloride distillation tower.

[0032] The numbers in the figure represent:

[0033] 1. Circulating still; 2. Trifluoroacetyl chloride distillation tower assembly; 21. Distillation tower; 22. First side line outlet; 23. Second side line outlet; 24. Crude sulfuryl chloride storage tank; 25. Oxidation reactor; 26. Waste buffer; 27. Hot water tank; 28. Plate heat exchanger; 3. Reboiler assembly; 31. Reboiler; 32. Steam main; 33. Waste hot water tank; 4. Condenser assembly; 41. Condenser; 42. Low-temperature refrigeration silicone oil outlet; 43. Expansion tank; 44. Falling film absorption tower; 45. Condenser return pipe; 5. Reflux tank; 6. Vaporizer assembly; 61. Vaporizer; 62. Circulating water outlet; 63. Circulating water main; 64. Production pump; 65. Pulsation damper. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] The utility model is further described below in conjunction with embodiments.

[0036] Example 1

[0037] Please refer to the instruction manual Figure 1-3 , a trifluoroacetyl chloride distillation tower, comprising a circulating still 1;

[0038] The discharge end of the circulating still 1 is connected to a trifluoroacetyl chloride distillation tower assembly 2 for distilling and purifying trifluoroacetyl chloride and recovering F113a;

[0039] The trifluoroacetyl chloride rectification tower assembly 2 comprises a rectification tower 21, a first side line extraction port 22, a second side line extraction port 23, a crude sulfuryl chloride storage tank 24, an oxidation reactor 25, a waste buffer 26, a hot water tank 27 and a plate heat exchanger 28, the discharge end of the circulating still 1 is connected to the feed end of the rectification tower 21, the discharge end of the rectification tower 21 is connected to the crude sulfuryl chloride storage tank 24, the exhaust gas outlet end of the rectification tower 21 is connected to the waste buffer 26, the water inlet end of the rectification tower 21 is connected to the hot water tank 27, the water outlet end of the rectification tower 21 is connected to the plate heat exchanger 28, the second side line extraction port 23 and the first side line extraction port 22 are respectively arranged above the feed end of the rectification tower 21, the first side line extraction port 22 is higher than the second side line extraction port 23, and the first side line extraction port 22 and the second side line extraction port 23 are both connected to the oxidation reactor 25;

[0040] The distillation tower 21 is connected to the reboiler assembly 3, the distillation tower 21 is connected to the reflux tank 5, and the distillation tower 21 is connected to the condenser assembly 4;

[0041] When the raw materials in the circulating still 1 enter the distillation tower 21, the reboiler assembly 3 repeatedly heats the raw materials in the distillation tower 21 to ensure that the raw material temperature is stable, the crude sulfuryl chloride in the distillation tower 21 enters the crude sulfuryl chloride storage tank 24, the F113a and SO3 in the distillation tower 21 are respectively recovered from the first side line outlet 22 and the second side line outlet 23 to the oxidation reactor 25 for further reaction, the exhaust gas enters the waste buffer 26 from the top of the distillation tower 21, the trifluoroacetyl chloride vapor mixed with F113a and SO3 enters the condenser assembly 4, and the hot circulating water flows from the hot water tank 27 through the distillation tower 21 and flows into the plate heat exchanger 28 after providing heat for the distillation tower 21.

[0042] The liquid outlet end of the trifluoroacetyl chloride distillation tower component 2 is connected to a reboiler component 3 for circulating and heating the liquid in the trifluoroacetyl chloride distillation tower component 2;

[0043] The reboiler assembly 3 includes a reboiler 31, a steam main pipe 32 and a waste hot water tank 33, the liquid outlet of the distillation tower 21 is connected to the liquid inlet of the reboiler 31, the liquid outlet of the reboiler 31 is connected to one of the liquid inlets of the distillation tower 21, the steam inlet of the reboiler 31 is connected to the steam main pipe 32, and the water outlet of the reboiler 31 is connected to the waste hot water tank 33;

[0044] When the raw materials in the distillation tower 21 enter the reboiler 31 for heating, they are then sent to the distillation tower 21. This cycle is repeated to ensure that the temperature of the raw materials in the distillation tower 21 is stable. The low-pressure saturated steam flows from the steam main 32 through the reboiler 31 and provides heat for the reboiler 31 before flowing into the waste hot water tank 33.

[0045] One of the steam outlet ends of the trifluoroacetyl chloride distillation tower component 2 is connected to a condenser component 4 for separating trifluoroacetyl chloride;

[0046] The condenser assembly 4 includes a condenser 41, a cryogenic silicone oil outlet 42, an expansion tank 43, a falling film absorption tower 44 and a condenser return pipe 45. One of the steam outlet ends of the distillation tower 21 is connected to the steam inlet end of the condenser 41, the oil inlet end of the condenser 41 is connected to the cryogenic silicone oil outlet 42, the oil outlet end of the condenser 41 is connected to the expansion tank 43 through the outer wall of the condenser return pipe 45, and the steam outlet end of the condenser 41 is connected to the falling film absorption tower 44;

[0047] The liquid outlet end of the condenser assembly 4 is connected to a reflux tank 5 for further separating trifluoroacetyl chloride;

[0048] The liquid outlet of the condenser 41 is connected to the liquid inlet of the reflux tank 5, the steam outlet of the reflux tank 5 is connected to the falling film absorber 44, the liquid outlet of the reflux tank 5 is respectively connected to the steam inlet of the distillation tower 21 and the vaporizer assembly 6, and the waste gas outlet of the reflux tank 5 is connected to the waste buffer 26;

[0049] When trifluoroacetyl chloride vapor mixed with F113a and SO3 enters the condenser 41, the non-condensable F113a and SO3 gas in the condenser 41 are recovered to the falling film absorption tower 44, and the low-temperature refrigeration silicone oil flows through the condenser 41 from the low-temperature refrigeration silicone oil outlet 42 and flows into the expansion tank 43 after cooling the condenser 41. The condenser return pipe 45 cools down and condenses by absorbing the cold air of the expansion tank 43; the liquid phase in the condenser 41 enters the reflux tank 5, and the residual F113a and SO3 gases are recovered again into the falling film absorption tower 44, thereby achieving efficient recovery of F113a and SO3, and the unit consumption of SO3 and F113a is reduced from 1.48 and 2.83 to 1.10 and 2.05; the waste gas in the reflux tank 5 enters the waste buffer 26, and part of the liquid trifluoroacetyl chloride in the reflux tank 5 is vaporized and flows back to the distillation tower 21 to maintain the temperature balance in the distillation tower 21, and the remaining liquid trifluoroacetyl chloride enters the vaporizer assembly 6.

[0050] The liquid outlet end of the reflux tank 5 is connected to a vaporizer assembly 6 for vaporizing liquid trifluoroacetyl chloride;

[0051] The gasifier assembly 6 includes a gasifier 61, a circulating water outlet 62, a circulating water main 63, a production pump 64 and a pulsation damper 65. The liquid outlet of the reflux tank 5 is connected to the liquid inlet of the gasifier 61 through the pulsation damper 65 and the production pump 64. The steam outlet of the gasifier 61 is connected to the falling film absorption tower 44. The water inlet of the gasifier 61 is connected to the circulating water outlet 62. The water outlet of the gasifier 61 is connected to the circulating water main 63.

[0052] When the liquid trifluoroacetyl chloride in the reflux tank 5 passes through the pulsation damper 65, the liquid pressure pulsation in the pipeline is eliminated and then transported to the vaporizer 61 by the extraction pump 64, thereby protecting the vaporizer 61. The liquid trifluoroacetyl chloride is vaporized in the vaporizer 61 and then returns to the falling film absorption tower 44. The circulating water flows through the vaporizer 61 from the circulating water outlet 62, provides heat for the vaporizer 61, and then flows into the circulating water main pipe 63.

[0053] Example 2

[0054] like Figure 1-3 As shown, preferably, multiple groups of temperature detection devices are arranged on the side line of the distillation tower 21, and the temperature in the tower is maintained below the lowest boiling point of the raw materials, 44.8°C;

[0055] This prevents the produced F113a and SO3 from dropping below the freezing point and causing blockage.

[0056] Example 3

[0057] like Figure 1-3 As shown, preferably, a plurality of sets of thermal gas mass flow meters are installed on the connecting pipeline.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A trifluoroacetyl chloride distillation tower, comprising a circulating still (1), characterized in that: The discharge end of the circulating still (1) is connected to a trifluoroacetyl chloride distillation tower component (2) for distilling and purifying trifluoroacetyl chloride and recovering F113a; The liquid outlet end of the trifluoroacetyl chloride distillation tower component (2) is connected to a reboiler component (3) for circulating and heating the liquid in the trifluoroacetyl chloride distillation tower component (2); One of the steam outlet ends of the trifluoroacetyl chloride rectification tower component (2) is connected to a condenser component (4) for separating trifluoroacetyl chloride; The liquid outlet end of the condenser assembly (4) is connected to a reflux tank (5) for further separating trifluoroacetyl chloride; The liquid outlet end of the reflux tank (5) is connected to a vaporizer assembly (6) for vaporizing liquid trifluoroacetyl chloride; The trifluoroacetyl chloride distillation tower assembly (2) comprises a distillation tower (21), a first side line production outlet (22), a second side line production outlet (23), a crude sulfuryl chloride storage tank (24), an oxidation reaction kettle (25), a waste buffer (26), a hot water tank (27) and a plate heat exchanger (28); the discharge end of the circulating distillation kettle (1) is connected to the feed end of the distillation tower (21), the discharge end of the distillation tower (21) is connected to the crude sulfuryl chloride storage tank (24), and the waste discharge end of the distillation tower (21) is connected to the crude sulfuryl chloride storage tank (24). The gas end is connected to the waste buffer (26), the water inlet end of the distillation tower (21) is connected to the hot water tank (27), the water outlet end of the distillation tower (21) is connected to the plate heat exchanger (28), and a second side line outlet (23) and a first side line outlet (22) are respectively provided above the feed end of the distillation tower (21), the first side line outlet (22) is higher than the second side line outlet (23), and the first side line outlet (22) and the second side line outlet (23) are both connected to the oxidation reaction kettle (25).

2. The trifluoroacetyl chloride distillation tower according to claim 1, characterized in that: The distillation tower (21) is connected to the reboiler assembly (3), and the distillation tower (21) is connected to the reflux tank (5).

3. The trifluoroacetyl chloride distillation tower according to claim 2, characterized in that: The distillation tower (21) is connected to the condenser assembly (4).

4. The trifluoroacetyl chloride distillation tower according to claim 3, characterized in that: The reboiler assembly (3) comprises a reboiler (31), a steam main pipe (32) and a waste hot water tank (33); the liquid outlet end of the distillation tower (21) is connected to the liquid inlet end of the reboiler (31); the liquid outlet end of the reboiler (31) is connected to one of the liquid inlet ends of the distillation tower (21); the steam inlet end of the reboiler (31) is connected to the steam main pipe (32); and the water outlet end of the reboiler (31) is connected to the waste hot water tank (33).

5. The trifluoroacetyl chloride distillation tower according to claim 4, characterized in that: When the raw materials in the distillation tower (21) enter the reboiler (31) and are heated, they are sent back to the distillation tower (21). This cycle is repeated to ensure that the temperature of the raw materials in the distillation tower (21) is stable. The low-pressure saturated steam flows from the steam main pipe (32) through the reboiler (31) and provides heat for the reboiler (31) before flowing into the waste hot water tank (33).

6. The trifluoroacetyl chloride distillation tower according to claim 5, characterized in that: The condenser assembly (4) comprises a condenser (41), a low-temperature refrigeration silicone oil outlet (42), an expansion tank (43), a falling film absorption tower (44) and a condenser return pipe (45); one of the steam outlet ends of the distillation tower (21) is connected to the steam inlet end of the condenser (41); the oil inlet end of the condenser (41) is connected to the low-temperature refrigeration silicone oil outlet (42); the oil outlet end of the condenser (41) is connected to the expansion tank (43) through the outer wall of the condenser return pipe (45); and the steam outlet end of the condenser (41) is connected to the falling film absorption tower (44).

7. The trifluoroacetyl chloride distillation tower according to claim 6, characterized in that: The liquid outlet end of the condenser (41) is connected to the liquid inlet end of the reflux tank (5), the steam outlet end of the reflux tank (5) is connected to the falling film absorption tower (44), the liquid outlet end of the reflux tank (5) is respectively connected to the steam inlet end of the distillation tower (21) and the vaporizer assembly (6), and the waste gas outlet end of the reflux tank (5) is connected to the waste buffer (26).

8. The trifluoroacetyl chloride distillation tower according to claim 7, characterized in that: The gasifier assembly (6) comprises a gasifier (61), a circulating water outlet (62), a circulating water main pipe (63), a production pump (64) and a pulsation damper (65); the liquid outlet of the reflux tank (5) is connected to the liquid inlet of the gasifier (61) through the pulsation damper (65) and the production pump (64); the steam outlet of the gasifier (61) is connected to the falling film absorption tower (44); the water inlet of the gasifier (61) is connected to the circulating water outlet (62); and the water outlet of the gasifier (61) is connected to the circulating water main pipe (63).

9. The trifluoroacetyl chloride distillation tower according to claim 8, characterized in that: A plurality of groups of temperature detection devices are arranged on the side line of the distillation tower (21).

10. The trifluoroacetyl chloride distillation tower according to claim 9, characterized in that: A plurality of groups of thermal gas mass flow meters are installed on the connecting pipeline.

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