Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of 2,3,3,3-tetrafluoropropene

A technology of tetrafluoropropene and trifluoropropane, which is applied in the field of preparation of hydrofluoroolefins, can solve the problems of harsh reaction conditions, difficult separation, harm, etc., and achieves the effect of mild reaction conditions and easy separation

Active Publication Date: 2016-07-13
山东华安近代环保科技有限公司
View PDF10 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the above-mentioned preparation method, at first, related to Cr 2 o 3 , alumina or fluorinated alumina supported Cr 2 o 3 Chromium-based catalysts, such as chromium-based catalysts, in fact, most of HFCs industrial production applications are chromium-based catalysts, and these chromium-containing compounds and catalysts will cause damage to the human digestive tract and kidneys, especially high-priced chromium has a strong carcinogenic effect , unfriendly to people and the environment in the process of production and use, will cause serious harm
Secondly, the intermediates HCFC-1233xf and HCFC-244bb are also involved, but these two halogenated hydrocarbons have close boiling points and have azeotrope-like characteristics, and they are also easy to form azeotropes with HF, which is difficult to separate. Their mixtures cannot be effectively separated by standard processes and conventional methods, especially when they form a binary azeotrope or azeotrope-like component
In addition, it has been found that when HCFC-244bb is dehydrochlorinated to prepare HFO-1234yf, the HCFO-1233xf and HF impurities contained therein can seriously affect the service life and product selectivity of the dehydrochlorination catalyst, which will easily lead to the reduction of HFO-1234yf selectivity and catalyst activity. reduction and shortened catalyst life
[0010] Although there are many methods for preparing HFO-1234yf disclosed at present, there are disadvantages such as harsh reaction conditions, unfriendly catalysts, energy consumption and cost increase caused by difficult separation of reaction intermediates, and low selectivity of target products. Therefore, there is a continuous improvement and demand for more efficient preparation methods

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
  • Preparation method of 2,3,3,3-tetrafluoropropene
  • Preparation method of 2,3,3,3-tetrafluoropropene
  • Preparation method of 2,3,3,3-tetrafluoropropene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Catalyst preparation: a certain proportion of Zn(NO 3 ) 2 ·6H 2 O, FeCl 3 , La(NO 3 ) 3 ·6H 2 Mix O into a 2mol / L aqueous solution, then add dropwise ammonia water with a mass fraction of 15% under constant stirring at 20°C-40°C, adjust the pH to about 8.0, react for 8 hours, filter, and then dry at 120°C for 2 hours , then mix a certain amount of magnesium oxide with it evenly, and then roast at 200°C for 1h, raise it to 320°C at 5°C / min, roast for 2h, then rise to 450°C at 10°C / min, roast for 4h, and finally pass hydrogen fluoride at 200°C It can be obtained by activation treatment at ℃-380℃, and it takes about 36h.

[0036] Internal diameter is in the fixed-bed tubular reactor of 38mm, loads the above-mentioned Zn-Fe-La-Mg composite catalyst of 50ml, wherein the mol ratio of Zn, Fe, La, Mg four is 0.5:2:0.5:7, and The catalyst was dried, and then at 250°C, HF and CCl 3 CCl 2 CH 2 Cl (HCC-230ab, abbreviated as 230ab) is passed into the first reactor R1, the ...

Embodiment 2～4

[0038] Examples 2-4 Prepare HCFC-233bc according to the same method as in Example 1, except that the reaction temperatures of R1 and R2 in Example 1 are 250°C and 300°C respectively, while in Examples 2-4, R1, R2 The reaction temperature and reaction results of R2 are shown in Table 1.

[0039] Table 1

[0040]

[0041]

Embodiment 5～7

[0043] Examples 5-7 Prepare HCFC-233bc according to the same method as in Example 1, the difference is that the ratio (molar ratio) of HF and organic materials in R1 and R2 in Example 1 is 10:1, 15:1 in sequence , The contact time in R1, R2 is respectively 15s, 20s, and among the embodiment 5~7, HF and organic material proportioning, contact time, reaction result are as shown in table 2, wherein the transformation rate of 230ab is 100%.

[0044] Table 2

[0045]

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of 2,3,3,3-tetrafluoropropene; the preparation method includes the steps: a, in the presence of a composite catalyst, carrying out a gas phase fluorination reaction of a compound represented by the general formula of CF3-xClxCF2-yClyCH2Cl with hydrogen fluoride through two series-connection reactors to generate 1,2,3-trichloro-1,1,2-trifluoropropane, wherein in the compound general formula, x=1, 2 or 3, y=1 or 2, and 3<=(x+y)<=5; b, carrying out a dechloridation reaction of 1,2,3-trichloro-1,1,2-trifluoropropane to generate 3-chloro-2,3,3-trifluoropropylene; and c, in the presence of a fluorination catalyst, carrying out a gas phase fluorination reaction of 3-chloro-2,3,3-trifluoropropylene with hydrogen fluoride to generate 2,3,3,3-tetrafluoropropene. The preparation method is mainly used for preparation of 2,3,3,3-tetrafluoropropene.

Description

technical field [0001] The invention relates to a method for preparing hydrofluoroolefins, in particular to a method for preparing 2,3,3,3-tetrafluoropropene (HFO-1234yf). Background technique [0002] Compared with chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs), hydrofluoroolefins (HFOs) do not contain chlorine, do not pose a threat to the earth's ozone layer, and have low greenhouse effect potential. At present, it has become the focus of industrial research on fluorocarbons. 2,3,3,3-Tetrafluoropropene, namely HFO-1234yf, as a kind of hydrofluoroolefins (HFOs), has an ozone depletion potential of 0 and a greenhouse effect potential of 4. It can be used as a refrigerant, fire extinguishing agent, Heat transfer media, propellants, blowing agents, blowing agents, gaseous media, sterilant carriers, polymer monomers, particle removal fluids, carrier gas fluids, abrasive polishes, replacement desiccants, and electrical circulation wo...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C21/18C07C17/20
Inventor 吕剑秦越马辉王博毛伟韩升郝志军杨志强唐晓博张伟
Owner 山东华安近代环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com