Saturation of alkenes in hydrogenation reactions
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Hello, teacher: In a hydrogen production plant’s hydrogenation reactor, where the raw materials react with the hydrogenation catalyst, how can one determine whether olefins are saturated? Please help! ! !
Take the gas from the reactor outlet for sample analysis
The olefin saturation reaction is highly exothermic; can you determine this from the position of the peak temperature in the reactor?
Samples are taken from the reactor outlet for analysis; by examining the analytical results, changes in bed temperature rise and hydrogen consumption are monitored to determine whether the reaction has been complete. Through the analysis of large amounts of experimental data and the derivation of relevant insights, it is possible to roughly determine at what temperature the olefin reaction is complete.
Compare the bromine value before and after the reaction to make a judgment
In the hydrogenation of olefins, the heat released during the reaction is very large. The bed temperature will rise. If the olefin content is high, above 10%, using an adiabatic reactor will cause the temperature to rise by more than 300 degrees, which is unacceptable for such a reactor; therefore, an isothermal reactor is required. Currently, in conventional natural gas-based hydrogen production (using natural gas from the West to the East), there is little olefins, and the amount of S is also very low. The temperature in the hydrogenation reactor does not change much; attention should be paid to any variations in the temperature distribution across the bed. The final method for making a judgment is sampling analysis; once empirical data is obtained, it becomes easier to make judgments going forward.
Composition analysis before and after the reactor – clear at a glance! ! ! ! ! !
Judging from the bromine value of the material at the reactor outlet, the lower the bromine value, the more complete the olefin hydrogenation reaction.