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CN-224208004-U - Purification system for producing trifluoroacetic acid

CN224208004UCN 224208004 UCN224208004 UCN 224208004UCN-224208004-U

Abstract

The utility model discloses a purification system for producing trifluoroacetic acid, which comprises a reaction kettle, a rectifying tower, a condenser, a reboiler, a collecting tank, a separating tank and a metering pump, wherein a discharge port of the reaction kettle is connected with a liquid inlet of the metering pump through a first pipeline, a liquid outlet of the metering pump is connected with a feed port of the rectifying tower through a second pipeline, a bottom of the rectifying tower is connected with a feed port of the reboiler through a third pipeline, the rectifying tower comprises a rectifying section of an upper half section and an extracting section of a lower half section, a discharge port of the reboiler is connected with the top of the extracting section of the rectifying tower through a fourth pipeline, the top of the rectifying section of the rectifying tower is connected with an air inlet of the separating tank through a fifth pipeline, an air outlet of the separating tank is connected with an air inlet of the condenser through a sixth pipeline, and a discharge port of the condenser is connected with the feed port of the collecting tank through a seventh pipeline. The utility model not only improves the purity of the trifluoroacetic acid, but also realizes the recycling of resources and reduces the production cost.

Inventors

  • XU YU
  • Cui huilong

Assignees

  • 宁夏佰斯特医药化工有限公司

Dates

Publication Date
20260508
Application Date
20250324

Claims (6)

  1. 1. The purification system for producing trifluoroacetic acid comprises a reaction kettle (1), a rectifying tower (2), a condenser (3), a reboiler (4), a collecting tank (5), a separating tank (6) and a metering pump (7), and is characterized in that a discharge port of the reaction kettle (1) is connected with a liquid inlet of the metering pump (7) through a first pipeline (101), a liquid outlet of the metering pump (7) is connected with a feed inlet of the rectifying tower (2) through a second pipeline (102), a bottom of the rectifying tower (2) is connected with a feed inlet of the reboiler (4) through a third pipeline (103), a rectifying section (21) containing an upper half section and an extraction section (22) of a lower half section are arranged in the rectifying tower (2), a discharge port of the reboiler (4) is connected with the top of the extraction section (22) of the rectifying tower (2) through a fourth pipeline (104), the top of the rectifying section (21) is connected with the separating tank (6) through a fifth pipeline (105), and an air inlet of the separating tank (6) is connected with a gas inlet of the seventh pipeline (106) through a condensing section (107).
  2. 2. The purification system for producing trifluoroacetic acid according to claim 1, wherein a stirring mechanism (11) is arranged inside the reaction kettle (1), a jacket (12) is arranged on the side wall of the reaction kettle (1), and a circulating liquid inlet (13) and a circulating liquid outlet (14) which are communicated with the inner cavity of the jacket (12) are arranged on the side wall of the reaction kettle (1).
  3. 3. The purification system for producing trifluoroacetic acid according to claim 1, wherein a spiral heat exchange coil (61) is arranged in the separation tank (6), the low end of the spiral heat exchange coil (61) is connected with a fifth pipeline (105), the high end of the spiral heat exchange coil (61) is connected with a sixth pipeline (106), and a circulating heat medium inlet (62) and a circulating refrigerant outlet (63) are sequentially arranged on the side wall of the separation tank (6).
  4. 4. A purification system for producing trifluoroacetic acid according to claim 3, characterized in that the bottom of the separation tank (6) is provided with a temperature sensor (64).
  5. 5. The purification system for producing trifluoroacetic acid according to claim 1, wherein the third pipe (103) is connected to a drain pipe (201), and a first electromagnetic valve (202) is provided to the drain pipe (201).
  6. 6. Purification system for producing trifluoroacetic acid according to claim 1, characterized in that the sixth conduit (106) is connected to the vacuum pump (8) through a ninth conduit (108), on which ninth conduit (108) a second solenoid valve (203) is arranged.

Description

Purification system for producing trifluoroacetic acid Technical Field The utility model relates to the technical field of trifluoroacetic acid purification, in particular to a purification system for producing trifluoroacetic acid. Background Trifluoroacetic acid (Trifluoroacetic acid, TFA) is a colorless liquid with a pungent odor. It is a strong organic acid with extremely high corrosiveness and toxicity. Trifluoroacetic acid has found wide application in many fields, such as organic synthesis, pharmaceutical, analytical chemistry, and the like, due to its unique physical and chemical properties. The trifluoroacetic acid contains three fluorine atoms in the molecular structure, which makes it highly electronegative and therefore highly electrophilic and nucleophilic. This allows trifluoroacetic acid to act as a powerful catalyst in organic synthesis for accelerating the progress of chemical reactions. In addition, trifluoroacetic acid can also be an effective solvent for dissolving various organic substances. However, the widespread use of trifluoroacetic acid also presents some problems. Firstly, because of its high corrosiveness and toxicity, handling and storage of trifluoroacetic acid requires great care. At present, in the process of preparing trifluoroacetic acid through sodium trifluoroacetate purification, the traditional purification process is to cool sodium trifluoroacetate, add absolute ethyl alcohol under stirring, and then slowly add concentrated sulfuric acid. And heating and refluxing for half an hour, then carrying out fractionation, and collecting the fraction at 62-64 ℃ to obtain the trifluoroacetic acid, wherein the produced trifluoroacetic acid has low purity, low yield, low ethanol utilization rate and high purification cost. Disclosure of utility model The utility model provides a purification system for producing trifluoroacetic acid, which solves the problems of low purity, low yield, low ethanol utilization rate and high production cost of the traditional trifluoroacetic acid. The utility model provides a purification system for producing trifluoroacetic acid, which comprises a reaction kettle, a rectifying tower, a condenser, a reboiler, a collecting tank, a separating tank and a metering pump, wherein a discharge port of the reaction kettle is connected with a liquid inlet of the metering pump through a first pipeline, a liquid outlet of the metering pump is connected with a feed inlet of the rectifying tower through a second pipeline, a bottom of the rectifying tower is connected with the feed inlet of the reboiler through a third pipeline, the rectifying tower comprises a rectifying section of an upper half section and an extracting section of a lower half section, a discharge port of the reboiler is connected with the top of the extracting section of the rectifying tower through a fourth pipeline, the top of the rectifying section of the rectifying tower is connected with an air inlet of the separating tank through a fifth pipeline, an air outlet of the separating tank is connected with an air inlet of the condenser through a sixth pipeline, and a discharge port of the condenser is connected with the feed inlet of the collecting tank through a seventh pipeline. In the above technical scheme, further, stirring mechanism is arranged inside the reaction kettle, a jacket is arranged on the side wall of the reaction kettle, and a circulating liquid inlet and a circulating liquid outlet which are communicated with the inner cavity of the jacket are arranged on the side wall of the reaction kettle. In the above technical scheme, further, spiral heat exchange coil is arranged in the separation tank, the low end of the spiral heat exchange coil is connected with the fifth pipeline, the high end of the spiral heat exchange coil is connected with the sixth pipeline, and a circulating heat medium inlet and a circulating refrigerant outlet are sequentially arranged on the side wall of the separation tank. In the above technical scheme, further, a temperature sensor is arranged at the bottom of the separation tank. In the above technical scheme, further, the third pipeline is connected with a liquid discharge pipe, and a first electromagnetic valve is arranged on the liquid discharge pipe. In the above technical scheme, further, the sixth pipeline is connected with the vacuum pump through a ninth pipeline, and a second electromagnetic valve is arranged on the ninth pipeline. According to the technical scheme, the utility model provides a purification system for producing trifluoroacetic acid. Compared with the prior art, the utility model has the beneficial effects that: 1. Sodium trifluoroacetate and sulfuric acid are added into a reaction kettle to react, a mixture of trifluoroacetic acid and sodium sulfate is generated, the reaction mixture is conveyed into an extraction section of a rectifying tower after being metered by a metering pump, ethanol is added to extract, the extracted mi