Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A manufacturing method and technology of fluoroolefins, applied in the field of fluoroolefins manufacturing, can solve the problems of saponification waste liquid recycling and treatment, saponification waste liquid recycling difficulties, product separation and purification difficulties, etc., to achieve convenient operation, avoid entrainment, The effect of reducing energy consumption
Active Publication Date: 2017-12-22
JUHUA GROUP TECH CENT
View PDF6 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
[0008] The dehydrofluorination of hydrofluoroalkanes to prepare hydrofluoroalkenes conventionally adopts the method of gas-phase catalytic dehydrofluorination and liquid-phase saponification dehydrofluorination, wherein the gas-phase catalytic dehydrofluorination is reacted under the action of a dehydrofluorination catalyst at a temperature greater than 250°C, and the reaction performance is poor, such as CN102884031A As described, the highest selectivity of HFO-1234yf is only 90%, which reduces the reaction yield and brings difficulties to product separation and purification
[0009] Liquid-phase saponification dehydrofluorination needs to be reacted at a higher reaction temperature and lye concentration. As described in CN101962314A, the reaction is carried out at a reaction temperature of about 160°C and an lye concentration of about 60%. This aspect increases energy consumption and is easy to produce Alkynes, on the other hand, the use of high-concentration saponification liquid brings difficulties to the recycling of saponification waste liquid
In order to increase the reaction speed, some patent documents also propose adding an organic solvent to the saponification solution to strengthen the dehydrofluorination process. Although this can reduce the concentration of the lye, it will bring difficulties to the recycling and treatment of the saponification waste solution due to the addition of an organic solution.
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
[0035] Add 500g of an aqueous solution containing 10% potassium hydroxide and 10% calcium hydroxide to a 1L reactor, heat it to 50°C under stirring, add 150g of HFC-245eb into the reactor, and react for 3h under stirring at 800rpm. Open the gas valve, collect the reaction gas in the air bag, analyze the collected reaction gas components, and calculate the conversion rate and selectivity.
Embodiment 2
[0037]Add 500g of an aqueous solution containing 5% potassium hydroxide and 20% calcium hydroxide to a 1L reactor, heat it to 70°C under stirring, add 300g of HFC-245eb into the reactor, and react for 3h under stirring at 800rpm, beat Open the gas valve, collect the reaction gas in the air bag, analyze the collected reaction gas components, and calculate the conversion rate and selectivity.
Embodiment 3
[0039] Add 500g of an aqueous solution containing 2% potassium hydroxide and 10% calcium hydroxide to a 1L reactor, heat it to 70°C under stirring, add 150g of HFC-245eb into the reactor, and react for 3h under stirring at 800rpm, beat Open the gas valve, collect the reaction gas in the air bag, analyze the collected reaction gas components, and calculate the conversion rate and selectivity.
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 preparation method for fluoralkene. The preparation method comprises the following steps: (1) mixing a 2-25% potassium hydroxide water solution with calcium hydroxide or calcium oxide to obtain a saponification liquid, and adding the obtained saponification liquid to a reaction kettle; (2) heating to 30-90 DEG C while stirring, and adding hydrofluoroalkane to the reaction kettle; (3) continuously stirring and keeping the reaction temperature to be 30-90 DEG C to realize defluorination of a liquid-phase hydrofluoroalkane to generate crude fluoralkene; (4) condensing and rectifying the reaction product obtained in the step (3) to obtain fluoralkene. The preparation method has the advantages of simple process, high reaction selectivity, less three-waste discharge and the like, and is suitable for industrialized production.
Description
technical field [0001] The invention relates to a method for producing fluoroolefins, which belongs to the technical field of organic fluorine chemical industry. Background technique [0002] HFO-1234yf is 2,3,3,3-tetrafluoropropene, its ODP is zero, its GWP value is 4, its atmospheric life is only 11 days, it has excellent physical and chemical properties, its molecular weight is similar to that of HFC-134a, and its Its boiling point and high saturated vapor pressure at room temperature, and its density and critical point are similar to HFC-134a, so it is considered as a "direct substitute" for HFC-134a and a potential low-carbon refrigerant. In addition, HFO-1234yf can be used in fire extinguishing agent, heat transfer medium, propellant, foaming agent, gas medium, polymer monomer, carrier gas fluid and other fields. [0003] HFO-1225ye is 1,2,3,3,3-pentafluoropropene, which has low greenhouse effect potential (GWP) and zero ozone depletion potential (ODP), and can also b...
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