Catalyst for preparing 1, 1, 1, 2, 3, 3, 3-heptafluoropropane as well as preparation method and applications thereof
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A technology of heptafluoropropane and catalyst, which is applied in the field of chromium carbonate-containing catalyst and its preparation, which can solve the problems of large equipment investment, high product cost, and long reaction time, and achieve the effects of short residence time, fast reaction speed, and high conversion rate
Inactive Publication Date: 2013-03-27
NANJING UNIV OF INFORMATION SCI & TECH
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The single conversion rate of this reaction is about 35%, and it is carried out under low temperature and normal pressure. However, an 8-meter-long stainless steel column is used, and the reaction time is long. Therefore, there are disadvantages of large investment in industrial equipment and high product cost.
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Embodiment 1
[0027] Embodiment 1: preparation catalyst A
[0028] 50 g of Cr was mechanically mixed 2 (CO 3 ) 3 and 500 g Al 2 o 3 Mix evenly, then add 275 mL of absolute ethanol and mix well, put it into a catalyst preparation device and press it into catalyst particles, dry it in a constant temperature drying oven at 150°C for 12 hours, take it out to get catalyst A, and put it in a desiccator for later use.
Embodiment 2
[0029] Embodiment 2: preparation catalyst B
[0030] 275 g Cr was mechanically mixed 2 (CO 3 ) 3 and 275 g Al 2 o 3 Mix evenly, then add 275 mL of absolute ethanol and mix evenly, put it into a catalyst preparation device and press it into catalyst particles, dry it in a constant temperature drying oven at 140°C for 20 hours, take it out to get catalyst B, and put it in a dryer for later use.
Embodiment 3
[0031] Embodiment 3: preparation catalyst C
[0032] According to the method of embodiment 1, take by weighing 500 g Cr 2 (CO 3 ) 3 , 50 g Al 2 o 3 , mechanically mix evenly, add 275 mL of absolute ethanol to mix, put it into a catalyst preparation device and press it into catalyst particles, dry it in a constant temperature drying oven at 160°C for 10 hours, take it out to get catalyst C, and put it in a desiccator for later use.
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Abstract
The invention provides a catalyst for preparing 1, 1, 1, 2, 3, 3, 3-heptafluoropropane as well as a preparation method and applications thereof, and relates to the field of organic synthesis, wherein the catalyst takes aluminum oxide as a carrier, and takes chromium carbonate as a catalytic active component. The invention also provides a method for preparing the catalyst, wherein the method for preparing the catalyst comprises the following steps of: mixing aluminum oxide and chromium carbonate uniformly, adding absolute ethyl alcohol and mixing uniformly, compressing and molding, and drying at 140-160 DEG C for 10-20 hours, thereby obtaining the catalyst. The method for applications comprises the following steps of: filling the catalyst into a fixed bed reactor; warming and activating in nitrogen, and then activating under an HF (hydrogen fluoride) gas; and introducing a hexafluoropropylene gas and the HF gas into the fixed bed reactor for addition reaction. The preparation of 1, 1, 1, 2, 3, 3, 3-heptafluoropropane by adopting the catalyst provided by the invention is high in efficiency, is mild in reaction conditions, has good selection, is short in reaction time, and is environment-friendly, and products are easy to be separated.
Description
technical field [0001] The invention relates to the field of organic synthesis, in particular to a chromium carbonate-containing catalyst for preparing 1,1,1,2,3,3,3-heptafluoropropane, a preparation method and application thereof. Background technique [0002] With the gradual strengthening of the awareness of environmental protection, the impact of the gas released by the fire extinguishing system on the atmosphere has attracted more and more people's attention. After the release of traditional halogenated alkanes, the residual time in the atmosphere can reach nearly a hundred years, which has a great impact on the environment. In order to protect the ozone layer of the atmosphere, according to the relevant provisions of international conventions, the production of this type of fire extinguishing agent has been banned since the end of 1993, and the use of this type of product has been banned worldwide since 2005. For example: Halon (Halon) fire extinguishing agent has exc...
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