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Method for purifying hydrogen fluoride in trifluoromethanesulfonyl fluoride

A technology of hydrogen fluoride and trifluoromethanesulfonyl fluoride in trifluoromethanesulfonyl fluoride, which is applied in the field of purification of hydrogen fluoride in trifluoromethanesulfonyl fluoride, can solve the problems of collapse of adsorbent, inability to remove hydrogen fluoride, and high hydrogen fluoride, etc. The effect of low cost, avoiding collapse and simple process

Pending Publication Date: 2022-05-13
PERIC SPECIAL GASES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The crude trifluoromethanesulfonyl fluoride liquid usually contains hydrogen fluoride impurities, and trifluoromethanesulfonyl fluoride and hydrogen fluoride will form an azeotrope, and the hydrogen fluoride cannot be removed by traditional rectification methods
And because the content of hydrogen fluoride in crude trifluoromethanesulfonyl fluoride liquid is relatively high, directly adopting adsorbent to adsorb hydrogen fluoride will cause the collapse of adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The purification method of hydrogen fluoride in the trifluoromethanesulfonyl fluoride of the present embodiment comprises the following steps:

[0024] S1. First pump the mixing kettle to negative pressure, the negative pressure is -0.07MPa, then transfer the crude trifluoromethanesulfonyl fluoride liquid in the crude product tank to the mixing kettle, and add sodium fluoride extractant, Stirring for 2 hours at a temperature of -25°C to obtain a mixture;

[0025] The mass fraction of hydrogen fluoride in the crude trifluoromethanesulfonyl fluoride liquid described in S1 is 5wt%; the dosage ratio of the crude trifluoromethanesulfonyl fluoride liquid and the extractant in the mixture described in S1 is 100mL:2g;

[0026] S2, feed nitrogen into the mixing tank described in S1, press the mixture obtained in S1 into a rectification tower for rectification, distill out the light component trifluoromethanesulfonyl fluoride, and discharge the heavy component impurities to hydro...

Embodiment 2

[0031] The purification method of hydrogen fluoride in the trifluoromethanesulfonyl fluoride of the present embodiment comprises the following steps:

[0032] S1. First pump the mixing tank to negative pressure, the negative pressure is -0.04MPa, then transfer the crude trifluoromethanesulfonyl fluoride liquid in the crude product tank to the mixing tank, and add potassium fluoride extractant, Stirring for 7 hours at a temperature of -32°C to obtain a mixture;

[0033] The mass fraction of hydrogen fluoride in the crude trifluoromethanesulfonyl fluoride liquid described in S1 is 7wt%; the dosage ratio of the crude trifluoromethanesulfonyl fluoride liquid and the extractant in the mixture described in S1 is 100mL: 3g;

[0034] S2, feed nitrogen into the mixing tank described in S1, press the mixture obtained in S1 into a rectification tower for rectification, distill out the light component trifluoromethanesulfonyl fluoride, and discharge the heavy component impurities to hydro...

Embodiment 3

[0039] The purification method of hydrogen fluoride in the trifluoromethanesulfonyl fluoride of the present embodiment comprises the following steps:

[0040] S1. First pump the mixing tank to negative pressure, the negative pressure is -0.01MPa, then transfer the crude product trifluoromethanesulfonyl fluoride liquid in the crude product tank to the mixing tank, and add potassium hydrogen fluoride extractant, Stirring for 10 hours at -40°C to obtain a mixture;

[0041] The mass fraction of hydrogen fluoride in the crude trifluoromethanesulfonyl fluoride liquid described in S1 is 10wt%; the dosage ratio of the crude trifluoromethanesulfonyl fluoride liquid and the extractant in the mixture described in S1 is 100mL:5g;

[0042] S2, feed nitrogen into the mixing tank described in S1, press the mixture obtained in S1 into a rectification tower for rectification, distill out the light component trifluoromethanesulfonyl fluoride, and discharge the heavy component impurities to hydr...

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Abstract

The invention discloses a method for purifying hydrogen fluoride in trifluoromethanesulfonyl fluoride, which comprises the following steps: firstly, pumping negative pressure in a mixing kettle, then introducing a crude trifluoromethanesulfonyl fluoride liquid, and adding an extracting agent to obtain a mixture; introducing nitrogen into the mixing kettle, transferring the mixture into a rectifying tower for rectifying, discharging heavy component impurities, and distilling out a light component trifluoromethanesulfonyl fluoride; and then introducing the evaporated light component trifluoromethanesulfonyl fluoride into an adsorption tower, adsorbing by adopting an adsorbent to obtain a refined trifluoromethanesulfonyl fluoride gas, and condensing into liquid in a refined tank. According to the invention, the extraction agent is adopted, and the action between the hydrogen fluoride and the extraction agent is utilized, so that the relative volatility between the hydrogen fluoride and the trifluoromethanesulfonyl fluoride is changed, and the vast majority of hydrogen fluoride can be removed; after the rectification process, the content of hydrogen fluoride in trifluoromethanesulfonyl fluoride is low, and the hydrogen fluoride is removed by using the adsorbent, so that the collapse of the adsorbent is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a method for purifying hydrogen fluoride in trifluoromethanesulfonyl fluoride. Background technique [0002] The crude trifluoromethanesulfonyl fluoride liquid usually contains hydrogen fluoride impurities, and trifluoromethanesulfonyl fluoride and hydrogen fluoride will form an azeotrope, and the hydrogen fluoride cannot be removed by traditional rectification methods. And because the hydrogen fluoride content in the crude trifluoromethanesulfonyl fluoride liquid is relatively high, directly using the adsorbent to adsorb hydrogen fluoride will cause the collapse of the adsorbent. Therefore, it is particularly important to develop a purification method for hydrogen fluoride in trifluoromethanesulfonyl fluoride. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for purifying hydrogen fluoride in trifl...

Claims

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Application Information

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IPC IPC(8): B01D11/04B01D3/14B01D53/78B01D53/68
CPCB01D11/04B01D3/143B01D53/78B01D53/68B01D2257/2047B01D2251/108
Inventor 朱姜涛范娜马毅斌王志民苏子杰李柄缘李林
Owner PERIC SPECIAL GASES CO LTD
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