Method for producing ethylene through ethanol dehydration
A technology for ethanol dehydration and ethylene, which is applied in the production of bulk chemicals, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problems of low reaction space velocity, etc., and achieve the effect of good technical effect
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[0017] [Example 1]
[0018] Catalyst preparation: Weigh 100 grams of silicon-alumina molar ratio SiO 2 / Al 2 O 3 ZSM-5 molecular sieve of 60, adding 40 grams of 40% (weight) silica sol and mixing, extrusion molding, drying at 120 ° C, to obtain sample A.
[0019] A mixture of 5 grams of tetrapropylamine bromide, 10 grams of 1,6-hexanediamine and 30 grams of distilled water was added in the reaction kettle in advance, and 10 grams of sample A were placed on the porous stainless steel mesh in the reaction kettle and sealed at 180 ° C. The gas-solid phase treatment was carried out for 100 hours. After the product was taken out, it was washed with distilled water, dried in the air, and calcined at 600° C. for 2 hours to obtain a ZSM-5 molecular sieve catalyst sample without a binder.
[0020] Put 3 grams of the prepared non-binder ZSM-5 molecular sieve catalyst sample into a fixed-bed reactor with an inner diameter of 18 mm. Before the experiment, nitrogen was activated at 550...
Example Embodiment
[0021] [Example 2]
[0022] According to the various steps and operating conditions of Example 1, just change the ZSM-5 molecular sieve Si-Al molar ratio SiO 2 / Al 2 O 3 As 100, the corresponding ZSM-5 molecular sieve catalyst without binder was prepared. The raw material used in the experiment is still anhydrous ethanol, the reaction temperature is 230 ° C, and the space velocity is 0.5 hours. -1 , under the condition of gauge pressure of 0.2MPa, the conversion rate of ethanol is 95.1%, and the selectivity of ethylene is 90.5%.
Example Embodiment
[0023] [Example 3]
[0024] According to the various steps and operating conditions of Example 1, just change the ZSM-5 molecular sieve Si-Al molar ratio SiO 2 / Al 2 O 3 As 180, the corresponding ZSM-5 molecular sieve catalyst without binder was prepared, and 0.5% iron was supported. The mass ratio of water and ethanol in the raw materials used in the experiment was 0.5:1, the reaction temperature was 275°C, and the space velocity was 0.8 hours. -1 , under the condition of gauge pressure of 0.05MPa, the conversion rate of ethanol is 100%, and the selectivity of ethylene is 97.6%.
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