Refining device for low-evaporation-residue high-purity difluorochloroethane

Abstract

The utility model relates to a low-evaporation residue high-purity difluorochloroethane refining device which is characterized in that a difluorochloroethane semi-finished product gas pipe is respectively switched by two pump valves to be connected into a main molecular sieve dryer and a standby molecular sieve dryer, and the main molecular sieve dryer and the standby molecular sieve dryer are respectively switched by the two pump valves to be connected to a screen filter; the screen filter is connected to the magnetic shielding filter through the pump valve, the magnetic shielding filter is connected to the sedimentation filter through the pump valve, and the sedimentation filter is connected to the precision filter through the pump valve and then is conveyed to a finished product storage tank. The device is compact in structure, impurities such as evaporation residues and residual iron salt in difluorochloroethane can be well removed, and the product purity is improved.

Description

Technical Field

[0001] The utility model relates to a chemical production device, in particular to a low-evaporation residue high-purity dichlorofluoroethane refining device. Background Art

[0002] PVDF is the second largest product among fluoroplastics in terms of output, mainly used in fields such as petrochemical industry, electronic and electrical, and fluorocarbon coatings. The purity requirement for dichlorofluoroethane products used for synthesizing PVDF is not high, with high evaporation residues and impurities such as residual iron salts and silicates in the products. With the rapid development of the lithium battery industry, the fluoroplastic PVDF used therein cannot meet the requirements of lithium battery grade manufacturers, restricting the application field of dichlorofluoroethane in the lithium battery industry. Summary of the Invention

[0003] The utility model provides a low-evaporation residue high-purity dichlorofluoroethane refining device with a compact structure, which can preferably remove impurities such as evaporation residues and residual iron salts in dichlorofluoroethane and improve the product purity.

[0004] The technical solution adopted by the utility model is: a low-evaporation residue high-purity dichlorofluoroethane refining device, characterized in that: it includes a main molecular sieve dryer and a standby molecular sieve dryer. The semi-finished dichlorofluoroethane gas pipe is respectively switched and connected to the main molecular sieve dryer and the standby molecular sieve dryer by two pump valves. The main molecular sieve dryer and the standby molecular sieve dryer are respectively switched and connected to a screen filter by two pump valves. The screen filter is connected to a magnetic shielding filter by a pump valve. The magnetic shielding filter is connected to a settling filter by a pump valve. The settling filter is connected to a precision filter by a pump valve and then sent to a finished product storage tank.

[0005] The settling filter is a plate-type cyclone settling filter.

[0006] The pump valve is a canned motor pump.

[0007] The utility model comprehensively filters and purifies the semi-finished dichlorofluoroethane through screen filtration, magnetic adsorption, plate-type cyclone settler, and precision filtration. The dichlorofluoroethane material after being dehydrated and dried by one main and one standby molecular sieve is transported to the screen filter by a canned motor pump to remove impurities such as larger-particle-size and worn molecular sieve desiccants. The dichlorofluoroethane material processed by the screen filter enters the magnetic shielding filter, and impurities such as iron salts and rust are removed through high magnetic force. The dichlorofluoroethane after magnetic shielding filtration enters the plate-type cyclone settling filter, and impurities are removed through deceleration sedimentation. The dichlorofluoroethane processed by the plate-type cyclone settling filter enters the precision filter for filtration and purification and then goes to the finished product storage tank. After adopting this device, impurities such as evaporation residues, iron salts, and silicates in dichlorofluoroethane can be reduced by one order of magnitude, fully meeting the requirements of lithium battery grade high-purity dichlorofluoroethane. Description of the Drawings

[0008] Figure 1 This is a schematic structural diagram of the present utility model.

[0009] In the figure: the semi-finished product gas pipe of 1,1-dichloro-1,2,2,2-tetrafluoroethane 1, main molecular sieve dryer 2, standby molecular sieve dryer 3, canned motor pump 4, screen filter 5, magnetic shielding filter 6, plate type cyclone sedimentation filter 7, precision filter 8, finished product storage tank 9. Specific embodiments

[0010] The following further explains in conjunction with the attached drawings.

[0011] Figure 1 As shown: a high-purity 1,1-dichloro-1,2,2,2-tetrafluoroethane refining device with low evaporation residue, including main molecular sieve dryer 2, standby molecular sieve dryer 3, canned motor pump 4, screen filter 5, magnetic shielding filter 6, plate type cyclone sedimentation filter 7, precision filter 8, finished product storage tank 9.

[0012] The semi-finished product gas pipe of 1,1-dichloro-1,2,2,2-tetrafluoroethane 1 is respectively switched and connected to the main molecular sieve dryer 2 and the standby molecular sieve dryer 3 by two canned motor pumps 4. The main molecular sieve dryer 2 and the standby molecular sieve dryer 3 are respectively switched and connected out to the screen filter 5 by two canned motor pumps. The screen filter 5 is connected out to the magnetic shielding filter 6 by a canned motor pump. The magnetic shielding filter 6 is connected out to the plate type cyclone sedimentation filter 7 by a canned motor pump. The plate type cyclone sedimentation filter 7 is connected out to the precision filter 8 by a canned motor pump and then sent to the finished product storage tank 9.

[0013] In this embodiment, the precision filter can be commercially available or the filter of the applicant's prior utility model 201220701293.2.

Claims

1. A high-purity dichlorofluoroethane refining device with low evaporation residue, characterized in that: It includes a main molecular sieve dryer and a standby molecular sieve dryer. The semi-finished gas pipe of 1,1-dichloro-1-fluoroethane is respectively switched and connected to the main molecular sieve dryer and the standby molecular sieve dryer by two pump valves. The main molecular sieve dryer and the standby molecular sieve dryer are respectively switched and connected out to a screen filter by two pump valves. The screen filter is connected out to a magnetic shielding filter by a pump valve. The magnetic shielding filter is connected out to a settling filter by a pump valve. The settling filter is connected out to a precision filter by a pump valve and then sent to a finished product storage tank.

2. The high-purity 1,1-dichloro-1-fluoroethane refining device with low evaporation residue according to claim 1, wherein: The settling filter is a plate type cyclone settling filter.

3. The high-purity 1,1-dichloro-1-fluoroethane refining device with low evaporation residue according to claim 1, wherein: The pump valve is a canned motor pump.

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