Production Of HFO-1234YF ,new Type And Green Refrigerant r1234yf replacing 134a

- Jun 11, 2020-

With the introduction of more and more global environmental regulations and policies aimed at reducing the greenhouse effect of hydrofluorocarbons, the fourth generation refrigerant HFO-1234yf has attracted much attention. This product has zero ozone potential (0DP), slightly flammable and relatively The low global warming potential (GWP) is characterized by a new generation of 0DS substitutes-hydrofluoroolefins (HF0) after hydrochlorofluorocarbons (HCFC) and hydrofluorocarbons (HFC). In recent years, with the EU's recognition of HFO-1234yf, HFO-1234yf is most likely to replace HFC-134a as a new generation of automotive refrigerants. HFO-1234yf is mainly used in automobiles and refrigerators, but also in many large stationary and commercial refrigeration equipment.

Juhua is the largest fluorinated chemical manufacturer in Chin, products including industrial refrigerants,  pharma grade propellant, poly-fluoro products,etc.. Juhua HFO-1234YF is on development and targeting at high-end refrigerant market.and pharma propellant market with development of other new type HFO gases. HFO-1234 industrial grade can also be shorted as refrigerant R1234yf,  which is a green replacement gas for automotive air conditioning gas for R134a.

The current mainstream HFO-1234yf production process has the following types:

 

   Production process ①: HFO-1234yf is produced by the addition elimination method of hexafluoropropylene (HFP);

 

   Production process ②: HFO-1234yf is produced by dehydrofluorination method using pentafluoropropane (HFC-245cb) as raw material;

 

   Production process ③: HFO-1234yf is produced by the fluorine-chlorine exchange method using 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) as raw material;

 

   Production process ④: Using tetrachloromethane and tetrafluoroethylene (TFE) as raw materials to pyrolyze to obtain tetrafluoropropene (HFO-1234yf);

 

  Production process ⑤: Using mixture of hexafluoropropane (HFC-236ea) and pentafluoropropane (HFC-245eb) as raw material to produce tetrafluoropropene (HFO-1234yf);

 

Production process ① Brief introduction: Let hydrogen and hexafluoropropene (HFP) undergo catalytic addition reaction to generate hexafluoropropane, and then eliminate the reaction to generate pentafluoropropene (HFO-1225ye); the generated pentafluoropropene (HFO-1225ye) is also the same as Hydrogen undergoes a catalytic addition reaction to produce pentafluoropropane, and then eliminates the reaction to finally produce the product tetrafluoropropene (HFO-1234yf). The conversion rate of hexafluoropropylene to pentafluoropropylene in the process is 98.2%, the conversion rate of pentafluoropropene to tetrafluoropropene is 97.1%, and the total conversion rate is 95.2%.

 

Brief introduction of production process ②: 1,1,2,3-tetrachloropropene (TCP) liquid phase synthesis of pentafluoropropane (HFC-245eb), pentafluoropropane (HFC-245eb) and then de-HF to produce tetrafluoropropene (HFO-1234yf ).

 

A production method of 1,1,2,3-tetrachloropropene for the production of HFO-1234yf is based on 1,1,1,3,3-pentachloropropane as a raw material. The method includes 3 steps: 1) 1 , 1,1,3,3-pentachloropropane (HCC-240) dehydrochlorination reaction to obtain 1,3,3,3-tetrachloro-1-propene; 2) 1,3,3,3-tetrachloro-1 -Propylene isomerization reaction to obtain 2,3,3,3-tetrachloro-1-propene; 3) 2,3,3,3-tetrachloro-1-propene isomerization reaction to obtain 1,1,2,3 -Tetrachloropropene. After the product obtained in step 3 is subjected to unit operations such as rectification, the product 1,1,2,3-tetrachloropropene with a purity of 99.5% is obtained.

 

Brief introduction of production process ③: by heating and reacting anhydrous hydrogen fluoride with specific chlorine-containing compounds in the gas phase in the presence of a fluorination catalyst, 2-chloro-3,3,3-trifluoropropene is produced; While heating, 2-chloro-3,3,3-trifluoropropene and anhydrous hydrogen fluoride are reacted in the gas phase in the presence of a fluorination catalyst to produce 2,3,3,3-tetrafluoropropene (HFO-1234yf ).

refrigerant R1234yf, replacement of R134a