Unlock instant, AI-driven research and patent intelligence for your innovation.
A method for preparing 1,1,1,2,2-pentafluoropropane
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of pentafluoropropane and tetrafluoropropene, which is applied in the field of preparing 1,1,1,2,2-pentafluoropropane, can solve the problems of high reaction temperature, harsh reaction conditions, and low selectivity of HFC-245cb, and achieve The effect of high reaction selectivity and mild reaction conditions
Active Publication Date: 2017-09-26
XIAN MODERN CHEM RES INST
View PDF2 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
In the above two patents, the selectivity of HFC-245cb is low, the reaction temperature is also very high, and the reaction conditions are harsh
Method used
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
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0013] The batch liquid phase fluorination reaction was carried out in a stirred 250mL stainless steel autoclave. Add 21.6g of SbF to the reactor in sequence 5 , 40g HF and 11.4g HFO-1234yf, the reaction temperature is 30°C, and the reaction is 2h. After the reaction, the sample was washed with water to remove acid and analyzed by gas chromatography. The results showed that the conversion rate of HFO-1234yf was 99.2%, and the selectivity of HFC-245cb was 100%. Embodiment 2-5
Embodiment 2～5
[0014] Examples 2-5 The method for preparing HFC-245cb is the same as that of Example 1, except that the metal fluoride salt, reaction temperature and reaction time are changed. The reaction results are shown in Table 1.
[0015] Table 1
[0016]
Embodiment 6
[0018] The method that embodiment 6 prepares HFC-245cb is identical with embodiment 1, difference is to adopt SbF 5 with SbF 3 The combination is a catalyst, and the molar ratio of the two is 1:1. After the reaction, the sample is washed with water to remove the acid and analyzed by gas chromatography. The results show that the conversion rate of HFO-1234yf is 81.2%, and the selectivity of HFC-245cb is 100%.
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
PUM
Login to View More
Abstract
The invention discloses a method for preparing 1,1,1,2,2-pentafluoropropane. The method is characterized by carrying out liquid phase fluorination on hydrogen fluoride and 2,3,3,3-tetrafluoropropene under the catalytic action of metal fluoride salt to synthesize 1,1,1,2,2-pentafluoropropane, wherein the mole ratio of 2,3,3,3-tetrafluoropropene to hydrogen fluoride is (0.02-1) to 1; the mole ratio of the feed quantity of 2,3,3,3-tetrafluoropropene to metal fluoride salt is (0.1-10) to 1; the reaction temperature is 0-80 DEG C; and metal fluoride salt is SbF5, NbF5, TaF5, SbF3, TiF4 or SnF4. The method for preparing 1,1,1,2,2-pentafluoropropane has the advantages of high reaction selectivity and mild reaction conditions.
Description
technical field [0001] The invention relates to a method for preparing 1,1,1,2,2-pentafluoropropane, in particular to the liquid-phase fluorination of hydrogen fluoride and 2,3,3,3-tetrafluoropropene under the catalysis of metal fluoride salts Method for the synthesis of 1,1,1,2,2-pentafluoropropane. Background technique [0002] With the increasingly serious problem of global warming in recent years, the third-generation refrigerants are facing to be phased out or phased out in advance. All countries in the world are actively developing fourth-generation new environmentally friendly refrigerants with excellent performance. 1,1,1,2,2-Pentafluoropropane (HFC-245cb), as one of the components in the fourth generation refrigerant, has a promising market prospect. [0003] Chinese patent CN103483140A reports that under the catalysis of Cr / Co catalyst, gas phase fluorinated trifluoropropane (HCFC-243db) synthesizes HFC-245cb, the reaction temperature is 325 ℃, 100% conversion of...
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
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to View More 
Login to View More