Could the reactants react before entering the reactor?

To even out the temperature distribution? If it is a catalytic reaction, then a reactor is needed to contain the catalyst. Moreover, reactions take time; some require a certain amount of mixing to achieve the desired conversion rate, and that is exactly what the reactor is used for. And the situation you mentioned only occurs when the reaction rate is high and a tubular reactor is suitable for use, right? Pay more attention to reaction engineering – there are so many different types of reactors, and they weren’t designed just for fun.

I’m asking quietly: is there a catalyst inside your reactor?

The poster’s question relates to two aspects: one is related to reaction thermodynamics, and the other is related to reaction kinetics. If the main reaction is thermodynamically spontaneous and the reaction conditions are already met before it enters the reactor, then the reaction may start before entering the reactor, but the extent of the reaction will not be as intense as inside the reactor. If the main reaction cannot proceed spontaneously and requires internal conditions of the reactor such as temperature, pressure, catalysts, initiators, etc., then merely physical mixing and contact prior to entering the reactor will not result in a chemical reaction. Could the original poster be more specific? With descriptions like this, which lack even a clear conceptual understanding of the substances involved, it is very difficult to arrive at accurate answers in natural sciences, especially chemistry.

Reply to 3# JYLID: This reaction does not require a catalyst and takes place at atmospheric pressure.

I think what was said on the 2nd floor is correct; even without a catalyst, the reactor still serves a purpose. Its structure enables the reactants to come into full contact with each other, prolongs the reaction time, and increases the depth of the reaction

The reaction vessel has a large volume, resulting in a long residence time inside it. If the material stays in the heating pipeline for only ten minutes, and assuming that the reactor has a certain volume with a feed flow rate of 100 liters per hour, it will take ten hours to completely replace the contents of the reactor; thus, its residence time is ten hours. It’s much larger compared to ten minutes. Sufficient residence time allows for a greater conversion of the reaction.

A mixer is simply used to ensure that the reactants are thoroughly mixed evenly; as long as the physical and chemical conditions such as reaction temperature and pressure are met, a reaction will definitely occur. It mainly depends on whether the reaction is exothermic/endothermic, whether it causes polymerization, and whether it has an impact on subsequent equipment. From the moment the mixer mixes them, the reactants begin to react; a mild chemical reaction does not necessarily have to wait until they are all inside the reactor to start. If it involves a violent chemical reaction, the mixer is clearly unsafe, which means the process package is incomplete.

Oh, I read the reply from the 7th floor carefully and think he has considered things quite reasonably. Mild chemical reactions can help extend the residence time as much as possible to ensure a complete reaction. It reflects the economy of reaction efficiency.

It’s not just that the reactor is used for reactions inside it; it also serves a purpose in storage and buffering. There are many experts on the HaiChuan Chemicals Forum, so I learned from them all at http://bbs.hg707.com