Preparation of 1,1-difluoroethane and fluorating catalyst

A technology based on fluorination catalyst and difluoroethane, applied in 1 field, can solve problems such as difficulty in disposal, affecting product yield and the like
CN101412654AActive Publication Date: 2009-04-22ZHEJIANG QUHUA FLUOR CHEM

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG QUHUA FLUOR CHEM
Publication Date
2009-04-22

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for preparing 1, 1-difluoroethane and a fluorination catalyst using the method. The method is characterized in that in the presence of a chromium-based fluorination catalyst, ethyne and anhydrous hydrofluoric acid are gasified and mixed to undergo gas-phase fluorination reaction so as to generate 1,1- difluoroethane HFC-152a(C2H4F2); the reaction temperature is between 140 and 380 DEG C; the pressure is between 0.3 and 1.8 MPa; under the standard condition, air speed of a reactor is between 300 and 2,200 h<-1>; the mixture ratio of the reaction materials of the anhydrous hydrofluoric acid to the ethyne is 4 to 1-30 to 1; the transformation rate of the ethyne in an outlet of the reactor reaches over 75 percent; and the selectivity of HFC-152a reaches over 90 percent.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to a process for the preparation of hydrofluorocarbons (HFCs). Specifically, 1,1-difluoroethane (CH 4 CF 2 ) preparation method. Background technique

[0002] HFC-152a, molecular structure is CH 3 —CHF 2 , the chemical name is 1,1-difluoroethane, the English name is: 1,1-bifluoroethane, the molecular weight is 66, the boiling point is -24.7 ° C, the ozone destruction potential value ODP=0; the global warming coefficient value GWP=0.03, is a An excellent alternative to ODS (Ozone Depleting Substances). Since HFC-152a has very similar physicochemical properties and thermodynamic properties to CFC-12, it is the preferred alternative to CFC-12. The mixed refrigerant HFC-152a / HCFC-22 is one of the main substances used to replace CFC-12, which has a damaging effect on the atmospheric ozone layer in recent years. In my country, as an environmental protection and energy saving working fluid, it is widely used in small refrig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More