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Catalyst for preparing hexafloroacetone by isomerization method and its preparing method and use

A technology of hexafluoroacetone and catalyst, which is applied in the field of catalyst for preparing hexafluoroacetone by isomerization method and its preparation and application field, and can solve the problems of high requirements on reaction conditions, low conversion rate of raw materials, low selectivity of hexafluoroacetone, etc. problems, to achieve the effects of improved thermal conductivity and heat resistance stability, simple preparation process, and high catalytic activity

Active Publication Date: 2008-11-12
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of low conversion rate of raw materials, low selectivity of hexafluoroacetone, high requirements on reaction conditions, easy deactivation of catalyst and high cost in the catalysts of the prior art used in the preparation of hexafluoroacetone by the above-mentioned catalytic isomerization, the object of the present invention To provide a catalyst that can catalyze isomerization of hexafluoropropylene oxide to prepare hexafluoroacetone at low temperature and normal pressure

Method used

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  • Catalyst for preparing hexafloroacetone by isomerization method and its preparing method and use
  • Catalyst for preparing hexafloroacetone by isomerization method and its preparing method and use

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Cr 2 o 3 -AlF 3 -TiO 2 -Graphite Composite Lewis Acid Catalyst (Sample A)

[0036] Weigh 1.40g Cr(OH) 3 , 6.75g AlF 3 , 29.24g TiO 2 , 4.18g of aluminum powder, mixed mechanically, added 40ml of deionized water to mix well, placed in the air atmosphere overnight, dried in a constant temperature drying oven at 120°C for 5.0h, took out, crushed and screened out 20-40 mesh samples, and put them in with an inner diameter of 7.3 mm quartz reaction tube, programmed to heat up to 350°C for 5.0h under nitrogen, with a heating rate of 1°C / min, N 2 Airspeed 600h -1 . After the activation is completed, put it into the desiccator for later use.

Embodiment 2

[0037] Example 2: Cr 2 o 3 -AlF 3 -TiO 2 - Aluminum powder composite Lewis acid catalyst (sample B)

[0038] According to the method of embodiment 1, take by weighing 1.40g Cr(OH) 3 , 6.75gAlF 3 , 29.24g TiO 2 , 4.18g of aluminum powder, mixed mechanically, added 45ml of deionized water, dried, and activated by temperature programming to make sample B and put it in a desiccator for later use.

Embodiment 3

[0039] Example 3: Cr 2 o 3 -TiO 2 - Graphite Composite Lewis Acid Catalyst (Sample C)

[0040] As the method of embodiment 1, take by weighing 10.38g Cr(OH) 3 , 27.0g TiO 2 , 4.15g of graphite, mixed mechanically, added 35ml of deionized water, dried, and activated by temperature programming to make sample C and put it in a desiccator for later use.

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Abstract

The present invention is catalyst for isomerization process of preparing hexafloroacetone and its preparation and application. The catalyst consists of main catalyst component Cr2O3 and / or AlF3, the first co-catalyst component TiO2 and the second co-catalyst component graphite or metal powder. The catalyst is prepared through mechanical mixing, drying and programmed heating to activate. By means of the catalyst, the isomerization process of preparing hexafloroacetone may be completed under normal temperature and normal pressure, can complete rearrangement instantaneously and has no need of inert gas for diluting material. The catalyst has facile material, simple preparation process, high catalytic activity, high operation stability and capacity of preparing high purity hexafloroacetone.

Description

technical field [0001] The invention relates to a solid catalyst used in the catalytic isomerization of hexafluoropropylene oxide to prepare hexafluoroacetone, a method for preparing the catalyst, and the preparation of hexafluoropropylene oxide by catalytic isomerization of hexafluoropropylene oxide at low temperature and normal pressure using the solid catalyst Acetone method. Background technique [0002] Hexafluoroacetone (CF 3 COCF 3 , referred to as HFA) is an important fluorine-containing fine chemical intermediate, and is the most widely used product in fluorine-containing ketones. Due to two -CF 3 The strong electron-withdrawing property of the group makes hexafluoroacetone have unique physical and chemical properties, and its downstream products are urgently needed in high-tech fields such as medicine, biochemistry, synthetic materials, microelectronics, and aerospace. For example, hexafluoroisopropanol can be obtained by hydrogenation reduction of hexafluoroac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/125B01J27/12B01J23/60B01J21/06C07C49/04C07C45/58
Inventor 徐卫国刘武灿方小青
Owner SINOCHEM LANTIAN
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