A process for preparing trifluoroacetaldehyde hydrate from 1,1,1-trifluoroethane
A technology of trifluoroethane and trifluoroacetaldehyde, applied in the field of chemical engineering, can solve the problems of harsh reaction conditions, unavailable, expensive raw materials, etc., and achieve the effects of low production cost, easy separation, and resource saving
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Embodiment 1
[0017] The raw materials consisting of 1,1,1-trifluoroethane, oxygen and nitrogen are mixed and preheated in a molar ratio of 1:1.5:1 and then injected into a fixed-bed reactor with 8% Fe 2 o 3 / AlF 3 As a catalyst, it reacts under the conditions of 0.5MPa and 280°C. The reaction is carried out continuously, and the outlet product is absorbed with water and trifluoroacetaldehyde hydrate is separated.
[0018] In this example, the conversion rate of 1,1,1-trifluoroethane was 17.6%, the selectivity of trifluoroacetaldehyde hydrate was 21.1%, and the purity of the separated trifluoroacetaldehyde hydrate was 92.1%.
Embodiment 2
[0020] The raw materials whose components are 1,1,1-trifluoroethane, oxygen and nitrogen are mixed and preheated in a molar ratio of 1:1.5:3 and then injected into the fixed-bed reactor with 16% Fe 2 o 3 / AlF 3 As a catalyst, it reacts under the conditions of 2MPa and 360°C, the reaction is carried out continuously, the outlet product is absorbed with water and trifluoroacetaldehyde hydrate is separated.
[0021] In this example, the conversion rate of 1,1,1-trifluoroethane was 38.6%, the selectivity of trifluoroacetaldehyde hydrate was 9.4%, and the purity of the separated trifluoroacetaldehyde hydrate was 93.5%.
Embodiment 3
[0023] Mix the raw materials of 1,1,1-trifluoroethane, oxygen and nitrogen with a molar ratio of 1:1.5:2 and inject them into the fixed-bed reactor after preheating, with 10% Fe 2 o 3 / AlF 3 As a catalyst, it reacts under the conditions of 0.1MPa and 320°C, the reaction is carried out continuously, the outlet product is absorbed with water and trifluoroacetaldehyde hydrate is separated.
[0024] In this example, the conversion rate of 1,1,1-trifluoroethane was 30.6%, the selectivity of trifluoroacetaldehyde hydrate was 16.8%, and the purity of the separated trifluoroacetaldehyde hydrate was 95.2%.
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