Hexafluoroethane purification method
A technology of hexafluoroethane and purification methods, which is applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of insufficient removal depth, enhanced adsorbent, etc., and achieve improved purity, reduced regeneration times, and high selectivity sexual effect
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Embodiment 1
[0080] Pass the raw material of hexafluoroethane into the first rectification tower, at -40°C, 0.5MPa, and the vent flow rate is 1Nm 3 Perform a rectification under the condition of one rectification; pass the hexafluoroethane raw material that has undergone the first rectification into the second rectification tower at -57°C, 0.18MPa, and the vent flow rate is 0.5Nm 3 Secondary rectification is carried out under the condition of / h; the first adsorbent used includes CO 2 The special adsorbent is the first adsorbent a and 3A molecular sieve is used as the first adsorbent b to carry out low-temperature adsorption; the raw material of hexafluoroethane that has undergone low-temperature adsorption is under the pressure condition of 0.6MPa, and is made of 5A and 13X molecular sieves Molecular sieves mixed at a ratio of 1:1.5 are used as the second adsorbent for pressurized adsorption to finally obtain a hexafluoroethane product with a purity of more than 99.9995%, and the volume c...
Embodiment 2
[0083] Pass the raw material of hexafluoroethane into the first rectification tower, at -67.2°C, 0.3MPa, and the vent flow rate is 0.5Nm 3 Carry out a rectification under the condition of one rectification; pass the hexafluoroethane raw material that has undergone the first rectification into the second rectification tower, at -59.6°C, 0.32MPa, and the vent flow rate is 0.8Nm 3 Secondary rectification is carried out under the condition of / h; the first adsorbent used includes CO 2 The special adsorbent is the first adsorbent a and the molecular sieve mixed with 4A and 13X molecular sieve at a ratio of 1:2 is the first adsorbent b for low-temperature adsorption; Under the pressure conditions of 5A and 13X molecular sieves mixed at a ratio of 1:1.8 as the second adsorbent for pressurized adsorption, hexafluoroethane products with a purity of more than 99.9995% are finally obtained, and the hexafluoroethane The volume concentration of impurities contained in the product is N 2 ...
Embodiment 3
[0086] Pass the raw material of hexafluoroethane into the first rectification tower, at -38°C, 0.8MPa, and the vent flow rate is 0.7Nm 3 Carry out a rectification under the condition of one rectification; pass the hexafluoroethane raw material that has undergone the first rectification into the second rectification tower, at -60.8°C, 0.17MPa, and the vent flow rate is 0.4Nm 3 Secondary rectification is carried out under the condition of / h; the first adsorbent used includes CO 2 The special adsorbent is the first adsorbent a and 13X molecular sieve is used as the first adsorbent b for low-temperature adsorption; the hexafluoroethane raw material that has undergone low-temperature adsorption is under the pressure of 1 MPa, and the hexafluoroethane raw material is made of 5A and 13X molecular sieve. Molecular sieves mixed at a ratio of 1:2 are used as the second adsorbent for pressurized adsorption, and finally a hexafluoroethane product with a purity of more than 99.9995% is ob...
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