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Method for removing moisture from fluorine-containing compounds

一种化合物、水分的技术，应用在分离方法、化学仪器和方法、卤代烃歧化分离/纯化等方向，能够解决处理效率差、阻碍吸附、生产率差等问题，达到简单处理方法、减少水分量、环境负荷小的效果

Active Publication Date: 2013-05-15
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to treat fluoropropene with a low moisture concentration using a moisture adsorbent, a large packed tower is required, which has the disadvantage of poor treatment efficiency.
In addition, in the method using an adsorbent, since it is necessary to periodically stop the equipment to regenerate and replace the adsorbent, the productivity is poor, and furthermore, there are problems such as the need for a series of equipment.
In addition, it is also considered that when the adsorbent is exchanged, a large amount of industrial waste is generated, and since the treated hydrofluoroolefins may be adsorbed on the adsorbent, the adsorption of the water to be removed is hindered.

Method used

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  • Method for removing moisture from fluorine-containing compounds
  • Method for removing moisture from fluorine-containing compounds

Examples

Experimental program
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Embodiment 1

[0048] Water contained in 2,3,3,3-tetrafluoropropene (HFO-1234yf) was removed by the following method. Regarding this method, according to figure 1 The flowchart shown in the illustration.

[0049] Using a moisture absorption tower T11 having a height of 3 m and an inner diameter of 12 cm, HFO-1234yf having a moisture content of 2000 ppm by weight was continuously supplied at a rate of 13.8 kg / hr from the bottom of the tower ( S11 ). On the other hand, a lithium chloride aqueous solution having a concentration of 42% by weight was supplied from the top of the tower, and dispersed in the tower ( S13 ). The pressure of HFO-1234yf supplied in the column was 0.05 MPaG, and the temperature at the top of the column was 25°C.

[0050] The HFO-1234yf supplied from the bottom of the column is taken out from the top of the column and sent to the next step (S12). By this operation, the water-containing HFO-1234yf supplied from the bottom of the tower fully contacts the lithium chlori...

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Abstract

This method is characterized by bringing a fluorine-containing compound that is contaminated with moisture into contact with an aqueous solution that contains a metal salt. The method enables efficient continuous removal of moisture from various fluorine-containing compounds such as hydrofluoroolefins, and rarely produces waste or the like, thus being industrially advantageous.

Description

technical field [0001] The present invention relates to a method for removing moisture from fluorine-containing compounds. Background technique [0002] Hydrofluorocarbons (HFCs) such as pentafluoroethane (HFC-125) and difluoromethane (HFC-32) are important alternatives to chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) that may damage the ozone layer. Substances are widely used. It is used in many aspects such as heat medium, refrigerant, foaming agent, solvent, cleaning agent, propellant, fire extinguishing agent, etc., and is consumed in large quantities. [0003] However, these hydrofluorocarbons are powerful greenhouse substances, and may have an influence on global warming due to their diffusion. As a countermeasure against this, collection after use is carried out, but not all of them can be collected, and diffusion due to leakage or the like cannot be ignored. Especially in the use of refrigerants, heat medium, etc., the use of CO 2 or alternative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38B01D53/26C07C17/389C07C21/18
CPCB01D2252/10B01D2252/103B01D2251/402B01D2256/26B01D53/263B01D53/28C07C17/38B01D2251/404B01D2251/60B01D2251/302B01D2257/80Y02P20/155C07C21/18B01D53/26C07C17/389
Inventor 高桥一博
Owner DAIKIN IND LTD