Method for separating and recovery difluorochloromethane azeotropic hexafluoropropene

A technology of difluorochloromethane and hexafluoropropylene, which is applied in the field of novel separation and recovery of difluorochloromethane-hexafluoropropylene azeotrope, and can solve problems such as increased operating costs, complicated process flow, and high price. Achieve the effect of lower operating cost, simple process flow and convenient operation

Active Publication Date: 2006-09-13
CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] 1. The process is complicated, there are many equipments, and the operation is troublesome
[0022] 2. The recovered product has poor purity and needs to be washed with water or absorbed by activated carbon to remove the extractant, resulting in new environmental pollution
[0023] 3. The extraction agent is lost during the operation, the low-priced extraction agent has a small processing capacity, and the high-efficiency extraction agent

Method used

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  • Method for separating and recovery difluorochloromethane azeotropic hexafluoropropene
  • Method for separating and recovery difluorochloromethane azeotropic hexafluoropropene
  • Method for separating and recovery difluorochloromethane azeotropic hexafluoropropene

Examples

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Effect test

Embodiment 1

[0050] Please combine figure 1 , at an ambient temperature of 20°C and a pressure of 0.5 MPa (absolute pressure), the azeotropic mixture of difluorochloromethane-hexafluoropropylene (the amount of the substance consists of 87% of difluorochloromethane and 13% of hexafluoropropylene) passes through Pipeline 1 passes through gas separation membrane module 2 in a gaseous state, and two streams of gas whose azeotropic ratio has been destroyed are obtained from gas separation membrane module 2: one is the permeate gas (substance) mainly composed of difluorochloromethane (HCFC-22) The amount consists of difluorochloromethane 97.67%, hexafluoropropylene 2.33%), which is introduced into the TFE production plant low-pressure gas cabinet 4 through pipeline 3 and reclaimed; the other is the retentate gas based on hexafluoropropylene (HFP) ( The amount of substance consists of chlorodifluoromethane 14.2%, hexafluoropropylene 85.8%).

[0051] The retentate gas is condensed through the pi...

Embodiment 2

[0053] Please combine figure 2 , at an ambient temperature of 20°C and a pressure of 0.5 MPa (absolute pressure), the azeotropic mixture of difluorochloromethane-hexafluoropropylene (the amount of the substance consists of 87% of difluorochloromethane and 13% of hexafluoropropylene) passes through Pipeline 1 passes through gas separation membrane module 2 in a gaseous state, and two streams of gas whose azeotropic ratio has been destroyed are obtained from gas separation membrane module 2: one is the permeate gas (substance) mainly composed of difluorochloromethane (HCFC-22) The amount composition is 97.67% of difluorochloromethane, 2.33% of hexafluoropropylene); the other is the retentate gas mainly based on hexafluoropropylene (HFP) (the amount of substance is composed of 14.2% of difluorochloromethane, Hexafluoropropylene 85.8%).

[0054] The retentate gas is condensed through the pipeline 5 through the -35°C condenser 6, collected into the condensate collection tank 7, a...

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Abstract

A process for separating and recovering bifluoro-chloromethane-hexafluoropropene azeotrope includes such steps as passing said gas-state mixed azeotrope through gas separating membrane to obtain penetrated bifluoro-chloromethane gas and residual hexafluoropropene gas, condensing the residual gas, rectifying to obtain pure hexafluoropropene, recovering the mixed azeotrope from tower top, returning it along with said penetrated gas back to rectifying system in tetrafluoro ethene production apparatus, and rectifying separation to recover bifluoro-chloromethane.

Description

technical field [0001] The present invention relates to a novel separation and recovery method of difluorochloromethane-hexafluoropropylene azeotrope, more specifically, the preliminary separation of difluorochloromethane-hexafluoropropylene azeotrope through a special high-efficiency gas separation membrane, Destroy its azeotropic ratio, and then use rectification to recover difluorochloromethane (HCFC-22 or F-22) and hexafluoropropylene (HFP) respectively. Background technique [0002] Fluorine is the first element of the VII main group, with the largest electronegativity and small atomic radius. The van der Waals radius is 0.135nm, which is only slightly larger than the hydrogen atom's van der Waals radius of 0.12nm. Most of the hydrogen atoms in organic compounds can be replaced by fluorine atoms with similar volumes to form a large number of organic fluorine compounds. Due to the large electronegativity of fluorine, small atomic radius, low polarizability of fluorine-c...

Claims

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Application Information

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IPC IPC(8): C07C17/38C07C17/383C07C19/10C07C21/18B01D53/22
Inventor 谢建平朱余民丁念承贺高红阮雪花苏学峰
Owner CHANGSHU 3F ZHONGHAO NEW CHEM MATERIALS
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