Effect of steam interruption during catalyst activation of 1,4-butynediol
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V. Steam interruption: During the catalyst preparation process, LS is used as the heating source. If the supply of LS is interrupted before the catalyst is added to the reactor, it has little impact on the system; it is sufficient to keep the reactor in its current state temporarily until LS service is restored. If heating is carried out using LS after adding the catalyst to the reactor and then LS supply is interrupted, it will have a significant impact on the catalyst. Experience dictates that the temperature should be raised to 75–75.5°C within 1 hour after the catalyst is added; if steam supply is stopped at that time, and the temperature cannot reach 75–75.5°C within 1 hour due to the heat generated by the reaction, expert advice from abroad indicates that this will result in the failure of catalyst preparation. At this point, the reaction heat should be utilized to continue raising the temperature, thereby minimizing heat loss as much as possible.
If the temperature rise due to the reaction heat does not reach 75–75.5°C within 1 hour, according to the experience of foreign experts, this will lead to the failure in catalyst preparation. What phenomena and reactions will occur over time? Causes activation failure?
The process conditions of the reactor are: 40% formaldehyde, 35% acetylene, 50 KPa, and 63°C. At 75°C, the catalyst activation reaction produces active cuprous acetylide; the catalyst expands, its specific surface area increases, and its activity is high. At 63°C, the reaction may also occur only on the surface of the catalyst; the catalyst does not expand, and its specific surface area is low.