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Method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis

A technology for the catalytic preparation of hexafluoroacetone, which is applied to the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds. Low cost, simple process, environment-friendly effect

Inactive Publication Date: 2013-03-13
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is: due to the high price of hexafluoropropylene, the production cost is very high
(2) Oxidation method of perfluoroisobutene: Due to the high toxicity of perfluoroisobutene, its direct utilization is limited
(3) Hexafluoropropylene oxide rearrangement method: Due to the high price of hexafluoropropylene oxide, the use of this method is limited

Method used

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  • Method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis
  • Method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis
  • Method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Mix 500 mL of 36.5% hydrochloric acid and 500 mL of 40% hydrofluoric acid to form an acid solution. Pour 150 g of activated carbon particles with a diameter of 2-4mm into the above acidic solution, stir at room temperature for 24 hours, filter, wash with water to neutrality, dry at 120°C for 10 hours, and dry at 300°C for 5 hours, as a catalyst carrier for later use .

[0021] Add 5 g CrCl 3 And 0.5g LaF 3 Dissolve in 50 mL of water to make a solution, weigh 44.5 g of the catalyst carrier and pour into the solution, and stir for 3 hours. Dry for 5 hours at 120°C and 5 hours at 300°C to obtain 10wt% CrCl 3 / 1wt%LaF 3 / C catalyst, denoted as Cat-1.

Embodiment 2

[0023] Prepare 10wt% Cr in the same way as in Example 1. 2 O 3 / 1wt%LaF 3 / C and marked as Cat-2, the difference is that Cr is used 2 O 3 Instead of CrCl 3 .

Embodiment 3

[0025] Prepare 10wt%CrBr in the same way as in Example 1. 3 / 1wt%LaF 3 / C and marked as Cat-3, the difference is that CrBr is used 3 Instead of CrCl 3 .

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Abstract

The invention provides a method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis, relating to the field of organic synthesis. The method comprises the following reaction steps: (1) introducing 1,1,3,3-tetrafluoro-1,3-dichloroacetone gas and hydrogen fluoride gas into a fixed bed type reactor with a supported catalyst, and reacting; and (2) rectifying the gas discharged from the fixed bed type reactor to obtain the 1,1,1,3,3,3-hexafluoroacetone. According to the method for preparing 1,1,1,3,3,3-hexafluoroacetone through gas-phase catalysis, the tetrafluorodichloroacetone is used as the raw material; and the process is simple and environment-friendly, low in cost and high in yield.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a gas-phase catalytic synthesis method for hexafluoroacetone. Background technique [0002] Hexafluoroacetone (HFA, CF 3 COCF 3 , also known as 1,1,1,3,3,3-hexafluoroacetone) is an important intermediate of fluorine materials, and its structure is as follows. [0003] [0004] At present, hexafluoroacetone has been widely used in the fields of medicine, pesticide and synthetic materials, especially as a raw material for the synthesis of polymer materials in special fields, which has profound significance. Specifically, hexafluoroacetone is mainly used in the following aspects: (1) Preparation of bisphenol AF. Hexafluoroacetone and phenol are condensed in HF to produce bisphenol AF, which is mainly used as a fluororubber crosslinking agent; (2) used to prepare high-performance polyimide monomers; (3) used to prepare foaming agents and refrigeration (4) In medicine, sevoflur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/167C07C45/63
Inventor 张超智
Owner NANJING UNIV OF INFORMATION SCI & TECH
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